Port Jefferson, New York
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 24° 41° -4° (1984) 69° (2002) 3.41" NA
February 25° 44° -11° (1934) 69° (1976) 3.05" NA
March 31° 51° 7° (1980) 83° (1945) 4.09" NA
April 40° 62° 17° (1982) 95° (2002) 4.5" NA
May 48° 72° 30° (1970) 95° (1996) 3.81" NA
June 59° 80° 38° (1967) 96° (2002) 4.28" NA
July 64° 85° 48° (1990) 99° (1999) 3.65" NA
August 64° 83° 44° (1965) 100° (2001) 3.62" NA
September 58° 76° 36° (1963) 96° (1983) 3.5" NA
October 47° 66° 26° (1966) 91° (1941) 4.1" NA
November 38° 56° 14° (1932) 81° (1950) 3.83" NA
December 29° 46° -3° (1942) 75° (1998) 4.02" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 34° 51° 17° (1936) 73° (2001) 0.14" NA
Dec 2 33° 50° 16° (1946) 71° (2001) 0.15" NA
Dec 3 33° 50° 12° (1976) 71° (1998) 0.15" NA
Dec 4 33° 50° 12° (1940) 73° (2001) 0.15" NA
Dec 5 32° 49° 12° (1926) 69° (1998) 0.15" NA
Dec 6 32° 49° 17° (1935) 70° (1998) 0.15" NA
Dec 7 32° 49° 16° (1926) 75° (1998) 0.14" NA
Dec 8 31° 48° 17° (1934) 67° (1951) 0.15" NA
Dec 9 31° 48° 13° (1934) 63° (1966) 0.15" NA
Dec 10 31° 48° 6° (1968) 70° (1966) 0.15" NA
Dec 11 30° 47° 9° (1968) 63° (1971) 0.14" NA
Dec 12 30° 47° 8° (1988) 68° (1979) 0.14" NA
Dec 13 30° 47° 9° (1960) 62° (1983) 0.13" NA
Dec 14 30° 46° 9° (1982) 59° (1927) 0.13" NA
Dec 15 29° 46° 9° (1960) 62° (1975) 0.13" NA
Dec 16 29° 46° 8° (1930) 62° (1971) 0.13" NA
Dec 17 29° 45° 11° (1932) 63° (2000) 0.12" NA
Dec 18 28° 45° 9° (1926) 60° (2001) 0.12" NA
Dec 19 28° 45° 9° (1926) 57° (1967) 0.11" NA
Dec 20 28° 45° -3° (1942) 58° (1939) 0.12" NA
Dec 21 28° 44° -1° (1942) 60° (1973) 0.11" NA
Dec 22 27° 44° 9° (1989) 60° (1990) 0.12" NA
Dec 23 27° 44° 8° (1989) 60° (1949) 0.11" NA
Dec 24 27° 44° 10° (1960) 59° (1990) 0.12" NA
Dec 25 27° 43° -2° (1980) 64° (1964) 0.12" NA
Dec 26 26° 43° 2° (1980) 60° (1936) 0.11" NA
Dec 27 26° 43° 9° (1950) 62° (1973) 0.12" NA
Dec 28 26° 43° 5° (2004) 59° (1954) 0.12" NA
Dec 29 26° 42° -2° (1933) 70° (1984) 0.12" NA
Dec 30 26° 42° -2° (1933) 66° (1984) 0.11" NA
Dec 31 25° 42° 1° (1962) 66° (1965) 0.11" NA
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