Thanks in large part to Hurricane Floyd, September 1999 was the wettest September on record in the Northeast. Precipitation for weather stations across the twelve-state region averaged 7.16 inches, which is nearly double (199%) the monthly normal. Several spots near the coast received in excess of 12 inches of rain during the course of the month. The states of Maine and Vermont each averaged over 8.5 inches of rain for the month, for their wettest Septembers on record. The state of Connecticut averaged 10.50 inches for their second wettest September on record. Delaware and New Jersey averaged 10.13 and 9.39 inches, respectively, for their second wettest Septembers as well. Rainfall associated with Hurricane Floyd (September 15-18) alone totalled over 8 inches in a corridor running from western Connecticut through the lower Hudson Valley and northern New Jersey, and into northern Delaware. The month's heavy rains did not cover the entire region, however. Extreme western New York, parts of western Pennsylvania and the western half of West Virginia all reported below normal precipitation amounts for the month.
September 1999 was also quite warm, especially in northern portions of the region. The area-weighted average temperature for the region was 2.5 degrees warmer than normal. Maine recorded the largest departure at 7.2 degrees warmer than normal, for their third warmest September on record. Vermont also reported its third warmest September with a departure of 4.4 degrees. Maryland and West Virginia were the only states to report below normal temperatures for the month at -0.3 and -1.2 degrees, respectively.
Monthly Summary of State Temperature and Precipitation Averages.
All-Time Greatest 24-Hour Precipitation Records (inches) City Date New Previous Mt. Mansfield, VT 16th-17th 9.92 6.05 on Aug 4, 1995 Philadelphia, PA 16th 6.63 5.89 on Aug 3-4, 1898 Albany, NY 16th-17th 6.05 4.75 on Oct 8-9, 1903 Daily Precipitation Records for the Month of September (inches) City Date New Previous Philadelphia, PA 16th 6.63 5.89 on Aug 3-4, 1898 Hartford, CT 16th 6.30 6.10 on Sep 20, 1938 Albany, NY 16th 5.60 n/a Daily Precipitation Records (inches) City Date New Previous Buffalo, NY 7th 1.46 1.25 in 1948 Philadelphia, PA 7th 1.22 1.08 in 1934 Williamsport, PA 7th 6.29 1.40 in 1958 Philadelphia, PA 9th 1.59 1.30 in 1872 Bridgeport, CT 10th 1.18 0.76 in 1993 Boston, MA 10th 4.71 3.89 in 1924 Worcester, MA 10th 2.35 1.05 in 1924 Central Park, NY 10th 1.38 1.25 in 1992 Bridgeport, CT 16th 3.00 0.94 in 1977 Newark, NJ 16th 6.22 1.10 in 1976 Central Park, NY 16th 5.02 1.63 in 1903 Harrisburg, PA 16th 3.15 2.99 in 1934 Williamsport, PA 16th 2.38 1.02 in 1977 September Monthly Precipitation Records (inches) City New Previous Philadelphia, PA 13.07 12.09 in 1882 Wilmington, DE 12.68 9.53 in 1960 Williamsport, PA 12.60 10.02 in 1975 Blue Hills Observatory, MA 11.90 11.04 in 1933 Albany, NY 11.06 8.91 in 1890 Burlington, VT 10.25 8.18 in 1945 Bangor, ME 9.88 9.03 in 1954 Caribou, ME 8.81 8.14 in 1954 St. Johnsbury, VT 8.59 n/a All-Time Monthly Precipitation Records (inches) City New Previous Philadelphia, PA 13.07 12.10 in Aug 1911 Wilmington, DE 12.68 12.63 in Jul 1989 Maximum Temperature Records (degrees F) City Date New Previous Mt. Washington, NH 1st 66 64 in 1942 Caribou, ME (tie) 2nd 88 88 in 1979 Mt. Washington, NH (tie) 2nd 65 65 in 1942 Burlington, VT (tie) 2nd 90 90 in 1953 Mt. Washington, NH 3rd 69 62 in 1961 Caribou, ME 3rd 90 84 in 1979 Caribou, ME (tie) 4th 85 85 in 1983 Mt. Washington, NH (tie) 4th 66 66 in 1953 Burlington, VT 4th 93 91 in 1884 Mt. Washington, NH 5th 66 63 in 1973 St. Johnsbury, VT (tie) 5th 91 91 in 1903 Mt. Washington, NH 6th 62 61 in 1983 Minimum Temperature Records (degrees F) City Date New Previous Elkins, WV (tie) 1st 38 38 in 1946 Elkins, WV (tie) 2nd 38 38 in 1987 Pittsburgh, PA (tie) 22nd 37 37 in 1983 Charleston, WV (tie) 22nd 39 39 in 1937 High Temperature Record for the Month of September (degrees F) City Date New Previous Mt. Washington, NH 3rd 69 67 on Sep 9, 1960
