Weather Extremes*

Highest Temperature: 100.5 July 21, 1991 & July 22, 1957
Lowest Temperature: -23.0 January 22, 1961
Average Yearly Temperature: 50.33
Coldest Year: 1967 (Average Temperature 47.5)
Warmest Year: 2006 (Average Temperature 53.2)
Greatest Daily Temperature Range: 56.5
Least Daily Temperature Range: 0.5
Average Annual Precipitation: 48.90"
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, 1949-0.18" October 1963
Maximum Daily Precipitation: 9.02" Sept 10-11, 1954-Hurricane Edna 9.00" October 14, 2005
Maximum Hourly Rainfall: 2.10" September 10-11, 1954-Hurricane Edna
Maximum Seasonal Snowfall: 90.8" 1995-96
Minimum Seasonal Snowfall: 4.5" 1997-98
Maximum Monthly Snowfall: 35.7" January 2011
Maximum Dail Snowfall 19.0" February 1978
Maximum Daily Snowfall, Single Storm: 26.3" December 2009
Longest Period Snow Cover: 55 days(December 26, 1947-February 18, 1948
Absolute First Day of Snowfall: October 17th
Absolute Last Day of Snowfall: April 27th
Peak Wind Speed: 125 mph-August 31, 1954-Hurricane Carol
Lowest Barometric Pressure: 28.375" September 12, 1960-Hurricane Donna

Measured at Brookhaven National Laboratory in Upton, NY from 1949 to 2011.

Long Island Monthly Averages
Mean Temperature
Precipitation
Snowfall
skip moreAverageskip moreMaximumskip moreMimimum
January
February
29.41
30.84
38
37.7
19.5
20.3
sk
4.05"
3.73"
sk
8.90"
10.08"

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