NRCC Northeast Regional Climate Center  

December State Temperature Averages

State December 1999 Coolest Warmest
Temperature Departure Rank Average Year Average Year
Connecticut 33.8 3.9 88 17.5 1989 36.8 1990
Delaware 40.5 3.1 89 26.0 1989 44.8 1984
Maine 25.5 6.1 93 5.3 1989 29.4 1900
Maryland 38.8 2.9 90 24.5 1989 43.6 1984
Massachusetts 33.6 4.6 92 16.4 1989 37.2 1923
New Hampshire 27.6 4.7 94 8.5 1989 30.9 1998
New Jersey 38.0 3.6 92 23.1 1989 41.0 1923
New York 29.0 3.5 82 11.5 1989 33.7 1923
Pennsylvania 32.7 2.8 76 17.8 1989 38.4 1923
Rhode Island 36.9 3.9 90 21.9 1989 42.4 1928
Vermont 25.9 4.2 86 5.0 1989 29.8 1996+
West Virginia 35.6 1.9 73 21.7 1989 42.6 1956
Northeast 31.2 3.7 88 14.4 1989 35.5 1923

Rankings are for 105 years between 1895 and 1999. 1=coolest; 105=warmest.

December State Precipitation Averages

State December 1999 Driest Wettest
Precipitation Departure Pct Normal Rank Amount Year Amount Year
Connecticut 2.83 -1.23 69% 35 0.79 1955 9.37 1973
Delaware 2.73 -0.85 76% 41 0.64 1988 8.15 1996
Maine 2.72 -1.05 72% 33 0.94 1943 8.76 1973
Maryland 2.65 -0.77 77% 42 0.48 1955 6.95 1969
Massachusetts 2.24 -1.86 54% 23 0.92 1943 8.52 1973
New Hampshire 1.86 -1.79 50% 15 0.94 1943 8.72 1973
New Jersey 3.01 -0.66 81% 49 0.39 1955 7.96 1996
New York 2.02 -1.29 61% 18 1.13 1943 6.04 1973
Pennsylvania 2.46 -0.67 78% 41 0.58 1955 6.23 1990
Rhode Island 2.63 -1.78 59% 28 0.71 1955 10.20 1936
Vermont 1.60 -1.68 48% 11 0.99 1943 7.51 1973
West Virginia 2.78 -0.62 81% 41 0.69 1965 7.08 1978
Northeast 2.40 -1.04 69% 26 1.02 1955 6.41 1973

Rankings are for 105 years between 1895 and 1999. 1=driest; 105=wettest.

+ indicates extreme also occurred in one or more previous years.
Departures are calculated using the 1961-1990 normals.