| Data through 1998 | Years | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| BIRMINGHAM C.O.,AL | 11 | -6 | 11 | 13 | 29 | 42 | 48 | 60 | 57 | 41 | 32 | 21 | -1 | -6 |
| BIRMINGHAM AP,AL | 55 | -6 | 3 | 2 | 26 | 35 | 42 | 51 | 51 | 37 | 27 | 5 | 1 | -6 |
| HUNTSVILLE, AL | 31 | -11 | 1 | 6 | 26 | 36 | 45 | 54 | 52 | 40 | 29 | 15 | -3 | -11 |
| MOBILE, AL | 57 | 3 | 11 | 21 | 32 | 43 | 49 | 60 | 59 | 42 | 30 | 22 | 8 | 3 |
| MONTGOMERY, AL | 54 | 0 | 10 | 17 | 28 | 40 | 49 | 59 | 56 | 39 | 26 | 13 | 5 | 0 |
| ANCHORAGE, AK | 45 | -34 | -26 | -24 | -4 | 17 | 33 | 38 | 31 | 19 | -5 | -21 | -30 | -34 |
| ANNETTE, AK | 51 | 1 | 2 | 1 | 21 | 31 | 37 | 40 | 40 | 33 | 18 | -3 | 1 | -3 |
| BARROW, AK | 78 | -53 | -56 | -52 | -42 | -19 | 4 | 22 | 20 | 1 | -32 | -40 | -55 | -56 |
| BARTER IS.,AK | 41 | -54 | -59 | -51 | -44 | -16 | 13 | 24 | 20 | 4 | -26 | -51 | -51 | -59 |
| BETHEL, AK | 40 | -48 | -38 | -39 | -22 | 4 | 28 | 31 | 28 | 18 | -5 | -24 | -37 | -48 |
| BETTLES,AK | 48 | -70 | -61 | -56 | -37 | -10 | 27 | 29 | 22 | 0 | -35 | -57 | -59 | -70 |
| BIG DELTA,AK | 54 | -63 | -60 | -49 | -37 | -1 | 30 | 32 | 22 | -2 | -39 | -47 | -62 | -63 |
| COLD BAY,AK | 55 | -8 | -9 | -13 | 4 | 18 | 29 | 33 | 33 | 26 | 10 | 1 | -1 | -13 |
| FAIRBANKS, AK | 47 | -61 | -58 | -49 | -24 | -1 | 31 | 35 | 27 | 3 | -27 | -46 | -62 | -62 |
| GULKANA,AK | 51 | -60 | -65 | -48 | -42 | 5 | 26 | 29 | 20 | 2 | -23 | -44 | -58 | -65 |
| HOMER, AK | 55 | -24 | -18 | -21 | -9 | 6 | 29 | 34 | 31 | 20 | 2 | -7 | -16 | -24 |
| JUNEAU, AK | 54 | -22 | -22 | -15 | 6 | 25 | 31 | 36 | 27 | 23 | 11 | -5 | -21 | -22 |
| KING SALMON, AK | 56 | -48 | -41 | -42 | -15 | 4 | 29 | 33 | 25 | 15 | -12 | -28 | -38 | -48 |
| KODIAK, AK | 50 | -16 | -12 | -6 | 7 | 20 | 30 | 37 | 34 | 26 | 10 | 0 | -2 | -16 |
| KOTZEBUE, AK | 56 | -49 | -52 | -48 | -44 | -18 | 20 | 30 | 29 | 13 | -19 | -36 | -47 | -52 |
| MCGRATH, AK | 56 | -75 | -64 | -51 | -40 | -2 | 30 | 33 | 25 | 2 | -28 | -53 | -67 | -75 |
| NOME, AK | 52 | -54 | -42 | -46 | -30 | -11 | 23 | 30 | 26 | 9 | -10 | -39 | -41 | -54 |
| ST. PAUL ISLAND, AK | 81 | -26 | -16 | -19 | -8 | 8 | 16 | 28 | 29 | 22 | 12 | 4 | -5 | -26 |
| TALKEETNA, AK | 59 | -48 | -46 | -43 | -37 | -5 | 28 | 33 | 25 | 11 | -21 | -41 | -45 | -48 |
| UNALAKLEET, AK | 30 | -48 | -50 | -50 | -30 | -6 | 25 | 32 | 28 | 6 | -20 | -47 | -50 | -50 |
| VALDEZ, AK | 27 | -20 | -5 | -6 | 5 | 21 | 31 | 33 | 32 | 25 | 8 | 1 | -6 | -20 |
| YAKUTAT, AK | 52 | -22 | -20 | -20 | 3 | 21 | 29 | 35 | 29 | 21 | 6 | -6 | -24 | -24 |
| FLAGSTAFF, AZ | 49 | -22 | -23 | -16 | -2 | 14 | 22 | 32 | 24 | 23 | -2 | -13 | -23 | -23 |
| PHOENIX, AZ | 61 | 17 | 22 | 25 | 32 | 40 | 50 | 61 | 60 | 47 | 34 | 25 | 22 | 17 |
| TUCSON, AZ | 58 | 16 | 20 | 20 | 27 | 38 | 47 | 59 | 61 | 44 | 26 | 24 | 16 | 16 |
| WINSLOW, AZ | 67 | -18 | -7 | 6 | 16 | 23 | 35 | 44 | 41 | 31 | 13 | -1 | -12 | -18 |
| YUMA, AZ | 45 | 24 | 28 | 32 | 41 | 46 | 54 | 63 | 63 | 53 | 35 | 30 | 27 | 24 |
| FORT SMITH, AR | 53 | -10 | -9 | 7 | 22 | 35 | 47 | 50 | 51 | 33 | 22 | 8 | -5 | -10 |
| LITTLE ROCK, AR | 57 | -4 | -5 | 11 | 28 | 40 | 46 | 54 | 52 | 37 | 29 | 17 | -1 | -5 |
| NORTH LITTLE ROCK, AR | 21 | -6 | 4 | 14 | 30 | 40 | 52 | 60 | 53 | 41 | 27 | 19 | -2 | -6 |
| BAKERSFIELD, CA | 61 | 20 | 25 | 31 | 34 | 37 | 45 | 52 | 52 | 45 | 29 | 28 | 19 | 19 |
| BISHOP, CA | 51 | -7 | -2 | 9 | 15 | 25 | 29 | 34 | 37 | 26 | 16 | 5 | -8 | -8 |
| BLUE CANYON, CA | 44 | 5 | 6 | 9 | 17 | 21 | 28 | 36 | 35 | 27 | 17 | 13 | 3 | 3 |
| EUREKA, CA. | 88 | 25 | 27 | 29 | 32 | 36 | 41 | 45 | 44 | 41 | 32 | 29 | 21 | 21 |
| FRESNO, CA | 49 | 19 | 24 | 26 | 32 | 36 | 44 | 50 | 49 | 37 | 27 | 26 | 18 | 18 |
| LONG BEACH, CA | 46 | 25 | 33 | 33 | 38 | 40 | 47 | 51 | 52 | 50 | 39 | 34 | 28 | 25 |
| LOS ANGELES AP, CA | 63 | 23 | 32 | 34 | 39 | 43 | 48 | 49 | 51 | 47 | 41 | 34 | 32 | 23 |
| LOS ANGELES C.O., CA | 58 | 28 | 34 | 26 | 39 | 46 | 50 | 54 | 53 | 51 | 41 | 38 | 30 | 26 |
| MOUNT SHASTA, CA | 42 | -2 | 1 | 11 | 14 | 21 | 25 | 31 | 34 | 25 | 19 | 9 | -5 | -5 |
| REDDING, CA | 12 | 19 | 21 | 28 | 33 | 36 | 42 | 54 | 51 | 40 | 33 | 23 | 17 | 17 |
| SACRAMENTO, CA | 48 | 23 | 23 | 26 | 32 | 36 | 41 | 48 | 49 | 43 | 36 | 26 | 18 | 18 |
| SAN DIEGO, CA | 58 | 29 | 36 | 39 | 41 | 48 | 51 | 55 | 57 | 51 | 43 | 38 | 34 | 29 |
| SAN FRANCISCO AP, CA | 71 | 24 | 25 | 30 | 31 | 36 | 41 | 43 | 42 | 38 | 34 | 25 | 20 | 20 |
| SAN FRANCISCO C.O., CA | 62 | 30 | 31 | 38 | 40 | 44 | 47 | 47 | 48 | 48 | 45 | 40 | 28 | 28 |
| SANTA BARBARA, CA | 12 | 26 | 25 | 34 | 38 | 38 | 42 | 49 | 47 | 45 | 36 | 30 | 20 | 20 |
| SANTA MARIA, CA | 56 | 20 | 22 | 24 | 31 | 31 | 36 | 43 | 43 | 36 | 26 | 25 | 20 | 20 |
| STOCKTON, CA | 39 | 19 | 22 | 27 | 32 | 38 | 45 | 50 | 50 | 43 | 33 | 25 | 17 | 17 |
| ALAMOSA, CO | 53 | -50 | -35 | -20 | -6 | 11 | 24 | 30 | 29 | 15 | -10 | -30 | -42 | -50 |
| COLORADO SPRINGS, CO | 50 | -26 | -27 | -11 | -3 | 21 | 32 | 42 | 39 | 22 | 5 | -8 | -24 | -27 |
| DENVER, CO | 61 | -25 | -30 | -11 | -2 | 22 | 30 | 43 | 41 | 17 | 3 | -8 | -25 | -30 |
| GRAND JUNCTION, CO | 52 | -23 | -18 | 5 | 11 | 26 | 34 | 44 | 43 | 29 | 18 | -2 | -17 | -23 |
| PUEBLO, CO | 57 | -29 | -31 | -20 | 2 | 25 | 36 | 44 | 40 | 27 | 4 | -17 | -25 | -31 |
| BRIDGEPORT, CT | 50 | -7 | -5 | 4 | 18 | 31 | 41 | 49 | 44 | 36 | 26 | 16 | -4 | -7 |
| HARTFORD, CT | 44 | -26 | -21 | -6 | 9 | 28 | 37 | 44 | 36 | 30 | 17 | 1 | -14 | -26 |
| WILMINGTON, DE | 51 | -14 | -6 | 2 | 18 | 30 | 41 | 48 | 43 | 36 | 24 | 14 | -7 | -14 |
| WASHINGTON DULLES AP, D.C. | 36 | -18 | -14 | -1 | 17 | 28 | 36 | 41 | 38 | 30 | 15 | 9 | -4 | -18 |
| WASHINGTON NAT'L AP, D.C. | 57 | -5 | 4 | 11 | 24 | 34 | 47 | 54 | 49 | 39 | 29 | 16 | 1 | -5 |
| Data through 1998 | Years | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| APALACHICOLA, FL | 63 | 9 | 21 | 22 | 36 | 47 | 48 | 63 | 62 | 50 | 37 | 24 | 13 | 9 |
| DAYTONA BEACH, FL | 55 | 15 | 24 | 26 | 35 | 44 | 52 | 60 | 65 | 52 | 41 | 27 | 19 | 15 |
| FORT MYERS, FL | 55 | 28 | 30 | 33 | 39 | 50 | 60 | 66 | 65 | 63 | 45 | 34 | 26 | 26 |
| GAINESVILLE, FL | 15 | 10 | 18 | 28 | 35 | 42 | 50 | 62 | 62 | 52 | 33 | 30 | 16 | 10 |
| JACKSONVILLE, FL | 57 | 7 | 19 | 23 | 34 | 45 | 47 | 61 | 63 | 48 | 36 | 21 | 11 | 7 |
| KEY WEST, FL | 46 | 41 | 45 | 47 | 48 | 64 | 68 | 69 | 68 | 69 | 60 | 49 | 44 | 41 |
| MIAMI, FL | 56 | 30 | 32 | 32 | 46 | 53 | 60 | 69 | 68 | 68 | 51 | 39 | 30 | 30 |
| ORLANDO, FL | 56 | 19 | 26 | 25 | 38 | 48 | 53 | 64 | 64 | 56 | 43 | 29 | 20 | 19 |
| PENSACOLA, FL | 35 | 5 | 15 | 22 | 33 | 48 | 56 | 61 | 62 | 43 | 32 | 25 | 11 | 5 |
| TALLAHASSEE, FL | 38 | 6 | 14 | 20 | 29 | 34 | 46 | 57 | 57 | 40 | 30 | 13 | 10 | 6 |
| TAMPA, FL | 52 | 21 | 24 | 29 | 40 | 49 | 53 | 63 | 67 | 57 | 40 | 23 | 18 | 18 |
| VERO BEACH, FL | 15 | 21 | 28 | 32 | 45 | 48 | 57 | 67 | 64 | 64 | 46 | 38 | 23 | 21 |
| WEST PALM BEACH, FL | 62 | 27 | 32 | 30 | 43 | 51 | 61 | 66 | 65 | 66 | 46 | 36 | 28 | 27 |
| ATHENS, GA | 55 | -4 | 5 | 11 | 26 | 37 | 45 | 55 | 54 | 36 | 24 | 7 | 2 | -4 |
| ATLANTA, GA | 50 | -8 | 5 | 10 | 26 | 37 | 46 | 53 | 55 | 36 | 28 | 3 | 0 | -8 |
| AUGUSTA,GA | 48 | -1 | 9 | 12 | 26 | 35 | 47 | 55 | 54 | 36 | 22 | 15 | 5 | -1 |
| COLUMBUS, GA | 53 | -2 | 10 | 16 | 28 | 39 | 44 | 59 | 57 | 38 | 24 | 10 | 4 | -2 |
| MACON, GA | 50 | -6 | 9 | 14 | 29 | 40 | 46 | 54 | 55 | 35 | 26 | 10 | 5 | -6 |
| SAVANNAH, GA | 48 | 3 | 14 | 20 | 32 | 39 | 51 | 61 | 57 | 43 | 28 | 15 | 9 | 3 |
| HILO, HI | 52 | 54 | 53 | 54 | 56 | 58 | 60 | 62 | 63 | 61 | 62 | 58 | 55 | 53 |
| HONOLULU,HI | 29 | 53 | 53 | 55 | 57 | 60 | 65 | 66 | 67 | 66 | 61 | 57 | 54 | 53 |
| KAHULUI, HI | 34 | 48 | 50 | 52 | 54 | 57 | 58 | 58 | 61 | 60 | 58 | 55 | 52 | 48 |
| LIHUE, HI | 48 | 50 | 52 | 51 | 56 | 58 | 61 | 62 | 66 | 65 | 61 | 57 | 52 | 50 |
| BOISE, ID | 59 | -17 | -15 | 6 | 19 | 22 | 31 | 35 | 34 | 23 | 11 | -3 | -25 | -25 |
| LEWISTON, ID | 52 | -22 | -15 | 2 | 20 | 23 | 34 | 41 | 41 | 28 | 16 | -3 | -22 | -22 |
| POCATELLO, ID | 49 | -30 | -33 | -12 | 13 | 20 | 28 | 34 | 30 | 19 | 10 | -14 | -29 | -33 |
| CAIRO,IL | 45 | -12 | -5 | 6 | 28 | 38 | 51 | 54 | 50 | 40 | 27 | 5 | -4 | -12 |
| CHICAGO,IL | 40 | -27 | -19 | -8 | 7 | 24 | 36 | 40 | 41 | 28 | 17 | 1 | -25 | -27 |
| MOLINE, IL | 66 | -27 | -28 | -19 | 7 | 26 | 39 | 46 | 40 | 24 | 16 | -9 | -24 | -28 |
| PEORIA, IL | 59 | -25 | -19 | -10 | 14 | 25 | 39 | 47 | 41 | 26 | 19 | -2 | -23 | -25 |
| ROCKFORD, IL | 48 | -27 | -24 | -11 | 5 | 24 | 37 | 43 | 41 | 27 | 15 | -10 | -24 | -27 |
| SPRINGFIELD, IL | 51 | -21 | -22 | -12 | 19 | 28 | 40 | 48 | 43 | 32 | 17 | -3 | -21 | -22 |
| EVANSVILLE, IN | 58 | -21 | -23 | -9 | 23 | 28 | 41 | 47 | 43 | 31 | 21 | -3 | -15 | -23 |
| FORT WAYNE, IN | 52 | -22 | -18 | -10 | 7 | 27 | 38 | 44 | 38 | 29 | 19 | -1 | -18 | -22 |
| INDIANAPOLIS, IN | 59 | -27 | -21 | -7 | 16 | 28 | 37 | 44 | 41 | 28 | 17 | -2 | -23 | -27 |
| SOUTH BEND, IN | 59 | -22 | -17 | -13 | 11 | 24 | 35 | 44 | 40 | 29 | 20 | -7 | -16 | -22 |
| DES MOINES, IA | 59 | -24 | -26 | -22 | 9 | 30 | 38 | 47 | 40 | 26 | 14 | -4 | -22 | -26 |
| DUBUQUE,IA | 46 | -28 | -27 | -20 | 11 | 24 | 36 | 44 | 40 | 28 | 13 | -17 | -25 | -28 |
| SIOUX CITY, IA | 58 | -26 | -26 | -22 | -2 | 25 | 38 | 42 | 37 | 24 | 12 | -9 | -24 | -26 |
| WATERLOO, IA | 50 | -33 | -31 | -34 | -4 | 25 | 38 | 42 | 38 | 22 | 11 | -17 | -27 | -34 |
| CONCORDIA, KS | 37 | -17 | -15 | -7 | 14 | 26 | 41 | 48 | 45 | 29 | 14 | -4 | -26 | -26 |
| DODGE CITY, KS | 56 | -13 | -15 | -15 | 14 | 26 | 41 | 46 | 47 | 29 | 14 | 0 | -21 | -21 |
| GOODLAND, KS | 78 | -26 | -22 | -20 | 0 | 21 | 31 | 42 | 38 | 19 | 7 | -12 | -27 | -27 |
| TOPEKA, KS | 52 | -20 | -23 | -7 | 10 | 26 | 43 | 43 | 41 | 29 | 19 | 2 | -26 | -26 |
| WICHITA, KS | 46 | -12 | -21 | -2 | 15 | 31 | 43 | 51 | 48 | 31 | 18 | 1 | -16 | -21 |
| GREATER CINCINNATI AP | 37 | -25 | -11 | -11 | 15 | 27 | 39 | 47 | 43 | 31 | 16 | 1 | -20 | -25 |
| JACKSON, KY | 18 | -18 | -8 | 7 | 20 | 32 | 44 | 52 | 45 | 34 | 26 | 13 | -13 | -18 |
| LEXINGTON, KY | 54 | -21 | -15 | -2 | 18 | 26 | 39 | 47 | 42 | 34 | 20 | -3 | -19 | -21 |
| LOUISVILLE, KY | 51 | -22 | -19 | -1 | 22 | 31 | 42 | 50 | 46 | 33 | 23 | -1 | -15 | -22 |
| PADUCAH KY | 15 | -15 | -8 | 11 | 24 | 35 | 44 | 54 | 44 | 35 | 24 | 10 | -10 | -15 |
| BATON ROUGE, LA | 48 | 9 | 15 | 20 | 32 | 44 | 53 | 58 | 59 | 43 | 30 | 21 | 8 | 8 |
| LAKE CHARLES, LA | 34 | 15 | 17 | 25 | 34 | 49 | 56 | 61 | 59 | 47 | 30 | 23 | 11 | 11 |
| NEW ORLEANS, LA | 52 | 14 | 16 | 25 | 32 | 41 | 50 | 60 | 60 | 42 | 35 | 24 | 11 | 11 |
| SHREVEPORT, LA | 46 | 3 | 12 | 20 | 31 | 42 | 52 | 58 | 53 | 42 | 28 | 16 | 5 | 3 |
| CARIBOU, ME | 59 | -33 | -41 | -21 | -2 | 18 | 30 | 36 | 34 | 23 | 14 | -8 | -31 | -41 |
| PORTLAND, ME | 58 | -26 | -39 | -21 | 8 | 23 | 33 | 40 | 33 | 23 | 15 | 3 | -21 | -39 |
| BALTIMORE, MD | 48 | -7 | -3 | 6 | 20 | 32 | 40 | 50 | 45 | 35 | 25 | 13 | 0 | -7 |
| BLUE HILL, MA | 113 | -16 | -21 | -5 | 6 | 27 | 36 | 44 | 39 | 28 | 21 | 5 | -19 | -21 |
| BOSTON, MA | 47 | -12 | -4 | 6 | 16 | 34 | 45 | 50 | 47 | 38 | 28 | 15 | -7 | -12 |
| WORCESTER, MA | 43 | -19 | -12 | -4 | 11 | 28 | 36 | 43 | 38 | 30 | 20 | 6 | -13 | -19 |
| ALPENA, MI | 40 | -28 | -37 | -27 | 0 | 20 | 28 | 34 | 30 | 25 | 16 | -6 | -18 | -37 |
| DETROIT, MI | 40 | -21 | -15 | -4 | 10 | 25 | 36 | 41 | 38 | 29 | 17 | 9 | -10 | -21 |
| FLINT, MI | 42 | -25 | -22 | -12 | 6 | 22 | 33 | 40 | 37 | 26 | 19 | 6 | -12 | -25 |
| GRAND RAPIDS, MI | 35 | -22 | -19 | -8 | 3 | 22 | 33 | 41 | 39 | 27 | 18 | 5 | -18 | -22 |
| HOUGHTON LAKE, MI | 34 | -26 | -34 | -23 | 3 | 21 | 29 | 33 | 29 | 21 | 16 | -5 | -21 | -34 |
| LANSING, MI | 40 | -29 | -25 | -15 | -2 | 19 | 30 | 37 | 35 | 22 | 15 | 4 | -17 | -29 |
| MARQUETTE, MI | 20 | -27 | -34 | -23 | -5 | 17 | 28 | 36 | 34 | 24 | 14 | -5 | -28 | -34 |
| MUSKEGON, MI | 59 | -13 | -19 | -10 | 1 | 22 | 31 | 40 | 36 | 27 | 21 | -14 | -15 | -19 |
| SAULT STE. MARIE, MI | 58 | -36 | -35 | -24 | -2 | 18 | 26 | 36 | 29 | 25 | 16 | -10 | -31 | -36 |
| DULUTH, MN | 57 | -39 | -39 | -29 | -5 | 17 | 27 | 35 | 32 | 22 | 8 | -23 | -34 | -39 |
| INTERNATIONAL FALLS, MN | 59 | -46 | -45 | -38 | -14 | 11 | 23 | 34 | 30 | 20 | 2 | -32 | -41 | -46 |
| MINNEAPOLIS - ST. PAUL, MN | 60 | -34 | -32 | -32 | 2 | 18 | 34 | 43 | 39 | 26 | 13 | -17 | -29 | -34 |
| ROCHESTER, MN | 39 | -32 | -35 | -31 | 5 | 21 | 35 | 42 | 37 | 23 | 11 | -20 | -33 | -35 |
| SAINT CLOUD, MN | 58 | -43 | -40 | -32 | -3 | 19 | 32 | 40 | 33 | 18 | 5 | -20 | -41 | -43 |
| JACKSON, MS | 35 | 2 | 10 | 15 | 27 | 38 | 47 | 51 | 55 | 35 | 26 | 17 | 4 | 2 |
| MERIDIAN, MS | 53 | 0 | 8 | 15 | 28 | 38 | 42 | 55 | 53 | 34 | 24 | 16 | 2 | 0 |
| TUPELO, MS | 15 | -6 | 4 | 16 | 29 | 40 | 49 | 58 | 52 | 43 | 29 | 19 | -3 | -6 |
| Data through 1998 | Years | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| COLUMBIA, MO | 29 | -19 | -15 | -5 | 19 | 29 | 40 | 48 | 42 | 32 | 22 | 0 | -20 | -20 |
| KANSAS CITY, MO | 26 | -17 | -19 | -10 | 12 | 30 | 42 | 51 | 43 | 31 | 17 | 1 | -23 | -23 |
| ST. LOUIS, MO | 41 | -18 | -12 | -5 | 22 | 31 | 43 | 51 | 47 | 36 | 23 | 1 | -16 | -18 |
| SPRINGFIELD, MO | 53 | -13 | -17 | -3 | 18 | 30 | 42 | 44 | 44 | 31 | 18 | 4 | -16 | -17 |
| BILLINGS, MT | 64 | -30 | -38 | -19 | -5 | 14 | 32 | 41 | 35 | 22 | -7 | -22 | -32 | -38 |
| GLASGOW, MT | 43 | -47 | -38 | -27 | -3 | 20 | 32 | 41 | 37 | 15 | -6 | -26 | -38 | -47 |
| GREAT FALLS, MT | 61 | -37 | -35 | -29 | -6 | 15 | 31 | 40 | 30 | 20 | -11 | -25 | -43 | -43 |
| HELENA, MT | 58 | -42 | -42 | -30 | 1 | 17 | 30 | 36 | 28 | 18 | -8 | -39 | -38 | -42 |
| KALISPELL, MT | 49 | -38 | -36 | -29 | 10 | 19 | 28 | 31 | 31 | 16 | -3 | -28 | -35 | -38 |
| MISSOULA, MT | 54 | -33 | -27 | -13 | 14 | 21 | 31 | 31 | 30 | 20 | 0 | -23 | -30 | -33 |
| GRAND ISLAND, NE | 53 | -28 | -19 | -21 | 7 | 23 | 38 | 42 | 40 | 23 | 9 | -11 | -26 | -28 |
| LINCOLN, NE | 27 | -33 | -24 | -19 | 3 | 24 | 39 | 42 | 41 | 26 | 8 | -5 | -27 | -33 |
| NORFOLK, NE | 53 | -27 | -26 | -20 | 2 | 24 | 38 | 42 | 40 | 26 | 11 | -15 | -30 | -30 |
| NORTH PLATTE, NE | 47 | -23 | -22 | -22 | 7 | 19 | 29 | 39 | 35 | 17 | 10 | -13 | -34 | -34 |
| OMAHA EPPLEY AP, NE | 62 | -23 | -21 | -16 | 5 | 27 | 38 | 44 | 43 | 25 | 13 | -9 | -23 | -23 |
| OMAHA (NORTH), NE | 39 | -22 | -20 | -16 | 7 | 25 | 41 | 44 | 44 | 28 | 15 | -11 | -25 | -25 |
| SCOTTSBLUFF, NE | 56 | -32 | -28 | -27 | -8 | 15 | 30 | 40 | 39 | 19 | -6 | -13 | -42 | -42 |
| VALENTINE, NE | 44 | -30 | -31 | -29 | 3 | 19 | 30 | 38 | 34 | 17 | -1 | -22 | -39 | -39 |
| ELKO, NV | 68 | -43 | -37 | -9 | -2 | 10 | 23 | 30 | 20 | 9 | 1 | -12 | -38 | -43 |
| ELY, NV | 60 | -27 | -30 | -13 | -5 | 7 | 18 | 28 | 24 | 15 | -3 | -15 | -29 | -30 |
| LAS VEGAS, NV | 50 | 8 | 16 | 23 | 31 | 40 | 48 | 60 | 56 | 46 | 26 | 21 | 11 | 8 |
| RENO, NV | 57 | -16 | -16 | -2 | 13 | 18 | 25 | 33 | 24 | 20 | 8 | 1 | -16 | -16 |
| WINNEMUCCA, NV | 49 | -24 | -28 | -3 | 6 | 12 | 23 | 29 | 28 | 12 | 5 | -8 | -37 | -37 |
| CONCORD, NH | 57 | -33 | -37 | -16 | 8 | 21 | 30 | 35 | 29 | 21 | 10 | -5 | -22 | -37 |
| MT. WASHINGTON, NH | 66 | -47 | -46 | -38 | -20 | -2 | 8 | 25 | 20 | 9 | -5 | -20 | -46 | -47 |
| ATLANTIC CITY AP, NJ | 55 | -10 | -11 | 5 | 12 | 25 | 37 | 42 | 40 | 32 | 20 | 10 | -7 | -11 |
| ATLANTIC CITY C.O.,NJ | 38 | -3 | 1 | 2 | 22 | 36 | 45 | 53 | 50 | 42 | 27 | 19 | 4 | -3 |
| NEWARK, NJ | 57 | -8 | -7 | 6 | 16 | 33 | 43 | 52 | 45 | 35 | 28 | 15 | -1 | -8 |
| ALBUQUERQUE, NM | 59 | -17 | -5 | 8 | 19 | 28 | 40 | 52 | 50 | 37 | 21 | -7 | -7 | -17 |
| CLAYTON, NM | 51 | -21 | -17 | -11 | 9 | 23 | 37 | 45 | 45 | 26 | 12 | -10 | -14 | -21 |
| ROSWELL, NM | 26 | -9 | 3 | 13 | 23 | 34 | 47 | 59 | 54 | 41 | 14 | 4 | -8 | -9 |
| ALBANY, NY | 52 | -28 | -21 | -21 | 10 | 26 | 36 | 40 | 34 | 24 | 16 | 5 | -22 | -28 |
| BINGHAMTON, NY | 47 | -20 | -15 | -7 | 9 | 25 | 33 | 39 | 37 | 25 | 17 | 3 | -18 | -20 |
| BUFFALO, NY | 55 | -16 | -20 | -7 | 12 | 26 | 35 | 43 | 38 | 32 | 20 | 9 | -10 | -20 |
| ISLIP, NY | 15 | -7 | 1 | 8 | 24 | 34 | 46 | 50 | 45 | 38 | 28 | 11 | 7 | -7 |
| NEW YORK C.PARK, NY | 130 | -6 | -15 | 3 | 12 | 32 | 44 | 52 | 50 | 39 | 28 | 5 | -13 | -15 |
| NEW YORK (JFK AP), NY | 38 | -2 | -2 | 7 | 20 | 34 | 45 | 55 | 46 | 40 | 25 | 19 | 2 | -2 |
| NEW YORK (LAGUARDIA AP), NY | 37 | -3 | -2 | 8 | 22 | 38 | 46 | 56 | 51 | 44 | 30 | 18 | -1 | -3 |
| ROCHESTER, NY | 58 | -17 | -19 | -6 | 13 | 26 | 35 | 42 | 36 | 28 | 20 | 5 | -16 | -19 |
| SYRACUSE, NY | 49 | -26 | -26 | -16 | 9 | 25 | 35 | 45 | 40 | 28 | 19 | 5 | -22 | -26 |
| ASHEVILLE, NC | 34 | -16 | -2 | 2 | 22 | 28 | 35 | 44 | 42 | 30 | 21 | 8 | -7 | -16 |
| CAPE HATTERAS, NC | 41 | 6 | 14 | 19 | 26 | 39 | 44 | 54 | 56 | 45 | 32 | 22 | 12 | 6 |
| CHARLOTTE, NC | 59 | -5 | 5 | 4 | 24 | 32 | 45 | 53 | 53 | 39 | 24 | 11 | 2 | -5 |
| GREENSBORO - WNSTN-SALM, NC | 70 | -8 | -4 | 5 | 21 | 32 | 42 | 48 | 45 | 35 | 20 | 10 | 0 | -8 |
| RALEIGH, NC | 54 | -9 | 0 | 11 | 23 | 31 | 38 | 48 | 46 | 37 | 19 | 11 | 4 | -9 |
| WILMINGTON, NC | 47 | 5 | 11 | 9 | 30 | 38 | 48 | 55 | 55 | 44 | 27 | 20 | 0 | 0 |
| BISMARCK, ND | 59 | -44 | -43 | -31 | -12 | 15 | 30 | 35 | 33 | 11 | -10 | -30 | -43 | -44 |
| FARGO, ND | 46 | -35 | -39 | -23 | -7 | 20 | 30 | 36 | 33 | 19 | 7 | -24 | -32 | -39 |
| WILLISTON, ND | 37 | -40 | -41 | -28 | -15 | 17 | 26 | 34 | 34 | 17 | -3 | -27 | -50 | -50 |
| AKRON, OH | 50 | -25 | -13 | -3 | 10 | 24 | 32 | 43 | 41 | 32 | 20 | -1 | -16 | -25 |
| CLEVELAND, OH | 57 | -20 | -15 | -5 | 10 | 25 | 31 | 41 | 38 | 32 | 19 | 3 | -15 | -20 |
| COLUMBUS, OH | 59 | -22 | -13 | -6 | 14 | 25 | 35 | 43 | 39 | 31 | 20 | 5 | -17 | -22 |
| DAYTON, OH | 55 | -25 | -16 | -7 | 15 | 27 | 40 | 44 | 40 | 32 | 21 | -2 | -20 | -25 |
| MANSFIELD, OH | 39 | -22 | -11 | -6 | 8 | 25 | 37 | 43 | 40 | 33 | 20 | 2 | -17 | -22 |
| TOLEDO, OH | 43 | -20 | -14 | -6 | 8 | 25 | 32 | 40 | 34 | 26 | 15 | 2 | -19 | -20 |
| YOUNGSTOWN, OH | 55 | -22 | -14 | -10 | 11 | 24 | 30 | 42 | 32 | 29 | 20 | 1 | -12 | -22 |
| OKLAHOMA CITY, OK | 45 | -4 | -3 | 3 | 20 | 37 | 47 | 53 | 51 | 36 | 16 | 11 | -8 | -8 |
| TULSA, OK | 60 | -8 | -11 | -3 | 22 | 35 | 49 | 51 | 52 | 35 | 18 | 10 | -8 | -11 |
| ASTORIA, OR | 45 | 11 | 9 | 22 | 29 | 30 | 37 | 39 | 39 | 33 | 26 | 15 | 6 | 6 |
| BURNS,OR | 14 | -27 | -28 | -14 | 10 | 15 | 21 | 25 | 24 | 17 | -3 | -13 | -20 | -28 |
| EUGENE, OR | 56 | -4 | -3 | 20 | 27 | 28 | 32 | 39 | 38 | 32 | 19 | 12 | -12 | -12 |
| MEDFORD, OR | 69 | -3 | 6 | 16 | 21 | 28 | 31 | 38 | 39 | 29 | 18 | 10 | -6 | -6 |
| PENDLETON, OR | 63 | -22 | -18 | 1 | 18 | 25 | 35 | 42 | 40 | 30 | 11 | -12 | -19 | -22 |
| PORTLAND, OR | 58 | -2 | -3 | 19 | 29 | 29 | 39 | 43 | 44 | 34 | 26 | 13 | 6 | -3 |
| SALEM, OR | 61 | -10 | -4 | 12 | 23 | 25 | 32 | 37 | 36 | 26 | 23 | 9 | -12 | -12 |
| SEXTON SUMMIT, OR | 44 | -2 | 9 | 15 | 19 | 22 | 27 | 36 | 36 | 26 | 20 | 11 | 2 | -2 |
| GUAM, PC | 41 | 56 | 59 | 54 | 59 | 62 | 63 | 64 | 63 | 61 | 64 | 62 | 61 | 54 |
| JOHNSTON ISLAND, PC | 29 | 65 | 64 | 67 | 65 | 68 | 69 | 70 | 70 | 71 | 66 | 63 | 62 | 62 |
| KOROR, PC | 49 | 69 | 71 | 69 | 69 | 71 | 70 | 70 | 70 | 70 | 71 | 70 | 71 | 69 |
| KWAJALEIN, MARSHALL IS., PC | 46 | 68 | 71 | 70 | 71 | 71 | 71 | 70 | 71 | 68 | 71 | 70 | 69 | 68 |
| MAJURO, MARSHALL IS, PC | 43 | 69 | 70 | 70 | 70 | 70 | 70 | 70 | 71 | 70 | 70 | 68 | 70 | 68 |
| PAGO PAGO, AMER SAMOA, PC | 39 | 67 | 67 | 67 | 68 | 66 | 64 | 62 | 64 | 63 | 67 | 67 | 67 | 62 |
| POHNPEI, CAROLINE IS., PC | 48 | 66 | 63 | 66 | 68 | 69 | 69 | 68 | 68 | 62 | 63 | 65 | 65 | 62 |
| CHUUK, E. CAROLINE IS., PC | 48 | 68 | 67 | 68 | 70 | 70 | 70 | 70 | 69 | 68 | 66 | 66 | 69 | 66 |
| WAKE ISLAND, PC | 50 | 65 | 65 | 65 | 65 | 69 | 71 | 69 | 68 | 69 | 68 | 65 | 64 | 64 |
| YAP, W CAROLINE IS., PC | 50 | 67 | 67 | 64 | 69 | 67 | 65 | 66 | 65 | 66 | 67 | 63 | 65 | 63 |
| Data through 1998 | Years | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ALLENTOWN, PA | 55 | -15 | -8 | -1 | 16 | 28 | 39 | 48 | 41 | 30 | 21 | 11 | -8 | -15 |
| ERIE, PA. | 45 | -18 | -17 | -9 | 12 | 26 | 32 | 44 | 37 | 33 | 24 | 7 | -6 | -18 |
| HARRISBURG, PA | 53 | -9 | -5 | 5 | 19 | 31 | 40 | 49 | 45 | 30 | 23 | 13 | -8 | -9 |
| MIDDLETOWN / HARRISBURG, PA | 60 | -22 | -5 | 5 | 19 | 31 | 40 | 49 | 45 | 30 | 23 | 13 | -8 | -22 |
| PHILADELPHIA, PA | 57 | -7 | -4 | 7 | 19 | 28 | 44 | 51 | 44 | 35 | 25 | 15 | 1 | -7 |
| PITTSBURGH, PA | 46 | -22 | -12 | -1 | 14 | 26 | 34 | 42 | 39 | 31 | 16 | -1 | -12 | -22 |
| AVOCA, PA | 43 | -21 | -16 | -4 | 14 | 27 | 34 | 43 | 38 | 30 | 19 | 9 | -9 | -21 |
| WILLIAMSPORT, PA | 54 | -20 | -13 | -2 | 15 | 28 | 36 | 43 | 38 | 28 | 20 | 8 | -15 | -20 |
| BLOCK IS.,RI | 39 | -2 | -2 | 8 | 18 | 34 | 41 | 51 | 45 | 40 | 30 | 16 | -4 | -4 |
| PROVIDENCE, RI | 45 | -13 | -7 | 1 | 14 | 29 | 41 | 48 | 40 | 33 | 20 | 6 | -10 | -13 |
| CHARLESTON AP,SC | 56 | 6 | 12 | 15 | 29 | 36 | 50 | 58 | 56 | 42 | 27 | 15 | 8 | 6 |
| CHARLESTON C.O.,SC | 14 | 10 | 22 | 22 | 36 | 51 | 58 | 65 | 59 | 55 | 40 | 35 | 5 | 5 |
| COLUMBIA, SC | 51 | -1 | 5 | 4 | 26 | 34 | 44 | 54 | 53 | 40 | 23 | 12 | 4 | -1 |
| GREENVILLE - SPARTANBRG, SC | 36 | -6 | 8 | 11 | 25 | 31 | 40 | 54 | 52 | 36 | 25 | 12 | 5 | -6 |
| ABERDEEN, SD | 37 | -35 | -45 | -32 | -2 | 19 | 33 | 39 | 32 | 20 | 8 | -27 | -39 | -45 |
| HURON, SD | 57 | -37 | -41 | -24 | -2 | 17 | 32 | 37 | 36 | 19 | 9 | -21 | -30 | -41 |
| RAPID CITY, SD | 56 | -27 | -31 | -21 | 1 | 18 | 31 | 39 | 38 | 18 | -2 | -19 | -30 | -31 |
| SIOUX FALLS, SD | 53 | -36 | -31 | -23 | 5 | 17 | 33 | 38 | 34 | 22 | 9 | -17 | -28 | -36 |
| BRISTOL - JOHNSON CITY,TN | 53 | -21 | -15 | -2 | 21 | 30 | 38 | 45 | 43 | 34 | 20 | 5 | -9 | -21 |
| CHATTANOOGA, TN | 59 | -10 | 1 | 8 | 25 | 34 | 41 | 51 | 50 | 36 | 22 | 4 | -2 | -10 |
| KNOXVILLE, TN | 57 | -24 | -8 | 1 | 22 | 32 | 43 | 49 | 49 | 36 | 25 | 5 | -6 | -24 |
| MEMPHIS, TN | 57 | -4 | -11 | 12 | 29 | 38 | 48 | 52 | 48 | 36 | 25 | 9 | -13 | -13 |
| NASHVILLE, TN | 59 | -17 | -13 | 2 | 23 | 34 | 42 | 51 | 47 | 36 | 26 | -1 | -10 | -17 |
| OAK RIDGE,TN | 51 | -17 | -13 | 1 | 20 | 30 | 39 | 49 | 50 | 33 | 21 | 0 | -7 | -17 |
| ABILENE, TX | 59 | -9 | -7 | 7 | 25 | 36 | 47 | 55 | 50 | 35 | 23 | 14 | -7 | -9 |
| AMARILLO, TX | 58 | -11 | -14 | -3 | 14 | 28 | 41 | 51 | 49 | 30 | 12 | 0 | -8 | -14 |
| AUSTIN, TX | 57 | -2 | 7 | 18 | 35 | 43 | 53 | 64 | 61 | 41 | 30 | 20 | 4 | -2 |
| BROWNSVILLE, TX | 60 | 19 | 22 | 32 | 38 | 52 | 60 | 68 | 63 | 55 | 35 | 31 | 16 | 16 |
| CORPUS CHRISTI, TX | 60 | 14 | 18 | 24 | 33 | 47 | 58 | 64 | 64 | 50 | 28 | 28 | 13 | 13 |
| DALLAS - FORT WORTH, TX | 45 | 4 | 7 | 15 | 29 | 41 | 51 | 59 | 56 | 43 | 29 | 20 | -1 | -1 |
| DEL RIO, TX | 36 | 15 | 14 | 21 | 33 | 45 | 55 | 64 | 64 | 48 | 28 | 22 | 10 | 10 |
| EL PASO, TX | 59 | -8 | 8 | 14 | 23 | 31 | 46 | 57 | 56 | 41 | 25 | 1 | 5 | -8 |
| GALVESTON, TX | 124 | 11 | 8 | 26 | 38 | 52 | 57 | 66 | 67 | 52 | 39 | 26 | 14 | 8 |
| HOUSTON, TX | 29 | 12 | 20 | 22 | 31 | 44 | 52 | 62 | 60 | 48 | 29 | 19 | 7 | 7 |
| LUBBOCK, TX | 52 | -16 | -8 | 2 | 22 | 30 | 44 | 51 | 52 | 33 | 18 | -1 | -2 | -16 |
| MIDLAND - ODESSA, TX | 51 | -8 | -11 | 9 | 20 | 34 | 47 | 53 | 54 | 36 | 24 | 13 | -1 | -11 |
| PORT ARTHUR, TX | 45 | 14 | 20 | 23 | 32 | 46 | 56 | 61 | 60 | 45 | 30 | 22 | 12 | 12 |
| SAN ANGELO, TX | 51 | 5 | -1 | 8 | 25 | 35 | 48 | 56 | 54 | 37 | 26 | 13 | -4 | -4 |
| SAN ANTONIO, TX | 57 | 0 | 6 | 19 | 31 | 43 | 53 | 62 | 61 | 41 | 27 | 21 | 6 | 0 |
| VICTORIA, TX | 38 | 14 | 19 | 21 | 33 | 49 | 59 | 62 | 62 | 49 | 31 | 24 | 9 | 9 |
| WACO, TX | 56 | -5 | 4 | 15 | 27 | 37 | 52 | 60 | 53 | 40 | 25 | 17 | -4 | -5 |
| WICHITA FALLS, TX | 52 | -5 | -8 | 8 | 24 | 36 | 51 | 54 | 53 | 38 | 25 | 14 | -7 | -8 |
| MILFORD, UT | 41 | -28 | -29 | -14 | 9 | 17 | 24 | 38 | 34 | 23 | -2 | -13 | -32 | -32 |
| SALT LAKE CITY, UT | 70 | -22 | -30 | 2 | 14 | 25 | 35 | 40 | 37 | 27 | 16 | -14 | -21 | -30 |
| BURLINGTON, VT | 55 | -30 | -30 | -20 | 2 | 24 | 33 | 39 | 35 | 25 | 15 | -2 | -26 | -30 |
| LYNCHBURG, VA | 54 | -10 | -10 | 7 | 20 | 31 | 40 | 49 | 45 | 36 | 21 | 8 | -4 | -10 |
| NORFOLK, VA | 50 | -3 | 8 | 18 | 28 | 36 | 45 | 54 | 49 | 45 | 27 | 20 | 7 | -3 |
| RICHMOND, VA | 69 | -12 | -10 | 11 | 23 | 31 | 40 | 51 | 46 | 35 | 21 | 10 | -1 | -12 |
| ROANOKE, VA | 51 | -11 | -1 | 9 | 20 | 31 | 39 | 47 | 42 | 34 | 22 | 9 | -4 | -11 |
| WALLOPS ISLAND, VA | 24 | 0 | 10 | 14 | 27 | 37 | 44 | 53 | 48 | 43 | 31 | 20 | 4 | 0 |
| OLYMPIA, WA | 57 | -8 | -1 | 9 | 23 | 25 | 30 | 35 | 33 | 25 | 20 | -1 | -7 | -8 |
| QUILLAYUTE, WA | 32 | 7 | 11 | 19 | 24 | 29 | 33 | 38 | 36 | 28 | 24 | 5 | 7 | 5 |
| SEATTLE C.O., WA | 65 | 11 | 11 | 22 | 31 | 35 | 42 | 47 | 48 | 40 | 30 | 13 | 9 | 9 |
| SEATTLE SEA-TAC AP, WA | 54 | 0 | 1 | 11 | 29 | 28 | 38 | 43 | 44 | 35 | 28 | 6 | 6 | 0 |
| SPOKANE, WA | 51 | -22 | -24 | -7 | 17 | 24 | 33 | 37 | 35 | 24 | 10 | -21 | -25 | -25 |
| WALLA WALLA, WA | 12 | -4 | -13 | 4 | 33 | 34 | 39 | 46 | 42 | 32 | 24 | -11 | -14 | -14 |
| YAKIMA, WA | 52 | -21 | -25 | -1 | 20 | 25 | 30 | 34 | 35 | 24 | 11 | -13 | -17 | -25 |
| SAN JUAN, PR | 44 | 61 | 62 | 60 | 64 | 66 | 69 | 69 | 70 | 69 | 67 | 66 | 63 | 60 |
| BECKLEY, WV | 35 | -22 | -16 | -5 | 11 | 23 | 32 | 41 | 36 | 30 | 18 | 4 | -18 | -22 |
| CHARLESTON, WV | 51 | -16 | -12 | 0 | 19 | 26 | 33 | 46 | 41 | 34 | 17 | 6 | -12 | -16 |
| ELKINS, WV | 54 | -24 | -22 | -15 | 3 | 20 | 25 | 32 | 34 | 27 | 11 | 0 | -24 | -24 |
| HUNTINGTON, WV | 38 | -21 | -9 | -2 | 20 | 27 | 40 | 46 | 43 | 31 | 16 | 8 | -13 | -21 |
| GREEN BAY, WI | 49 | -31 | -28 | -29 | 7 | 21 | 32 | 40 | 38 | 24 | 15 | -9 | -27 | -31 |
| LA CROSSE, WI | 47 | -37 | -36 | -28 | 7 | 26 | 37 | 33 | 40 | 28 | 14 | -9 | -30 | -37 |
| MADISON, WI | 59 | -37 | -29 | -29 | 0 | 19 | 31 | 36 | 35 | 25 | 13 | -11 | -25 | -37 |
| MILWAUKEE, WI | 58 | -26 | -26 | -10 | 12 | 21 | 33 | 40 | 44 | 28 | 18 | -5 | -20 | -26 |
| CASPER, WY | 48 | -40 | -29 | -21 | -6 | 16 | 28 | 30 | 33 | 16 | -3 | -21 | -41 | -41 |
| CHEYENNE, WY | 63 | -29 | -34 | -21 | -8 | 16 | 25 | 38 | 36 | 8 | -1 | -16 | -28 | -34 |
| LANDER, WY | 52 | -37 | -28 | -16 | -2 | 18 | 25 | 39 | 35 | 10 | -3 | -18 | -37 | -37 |
| SHERIDAN, WY | 58 | -35 | -32 | -23 | -2 | 13 | 27 | 35 | 33 | 6 | -9 | -25 | -37 | -37 |
Last Updated on 5/25/2000
By NRCC