Meteorological Extremes
The following table lists the Meteorological Extremes (oF) at Brookhaven National Laboratory. The period covered is from 1949 to the present.
Absolute Highest Temperature 100.5 F July 21 1991 & July 22, 1957
Absolute Lowest Temperature -23.0 F January 22, 1961
Average Yearly Temperature 50.0 F
Coldest Year 1967 (Avg. Temp. = 47.5 F)
Warmest Year 1998 (Avg. Temp. = 53.1 F)
Greatest Daily Temperature Range 56.5 F
Least Daily Temperature Range 0.5 F
Maximum Annual Degree Days 6753 for 1967
Maximum Monthly Degree Days 1414 in January 1977
Average Annual Precipitation 48.36"
Maximum Annual Precipitation 68.66" in 1989
Minimum Annual Precipitation 34.35" in 1965
Maximum Monthly Precipitation 22.14" in October 2005
Minimum Monthly Precipitation Trace in June 1949
Maximum Daily Precipitation 9.02" September 10 - 11, 1954 Hurricane Edna
Maximum Hourly Rainfall 2.10" September 10 - 11, 1954 Hurricane Edna
Average Annual Snowfall 29.6"
Maximum Seasonal Snowfall 90.8" 1995 - 96
Minimum Seasonal Snowfall 4.5" 1997 - 98
Maximum Monthly Snowfall 32.5" February 1967
Maximum Daily Snowfall 19.0" February 1978
Maximum Snowfall, Single Storm 23.0" February 1978
Longest Period Snow Cover 55 days (Dec. 26, 1947 - February 18, 1948)
Absolute First Day of Snowfall October 17
Absolute Last Day of Snowfall April 27
Peak Wind Speed 125 mph - August 31, 1954 Hurricane Carol
Lowest Barometric Pressure 28.375" September 12, 1960 Hurricane Donna
