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
Jan 1 25° 42° 7° (1963) 59° (1966) 0.1" NA
Jan 2 25° 42° 10° (1957) 61° (2000) 0.1" NA
Jan 3 25° 42° 10° (1968) 64° (1998) 0.11" NA
Jan 4 25° 42° 3° (1981) 63° (1998) 0.1" NA
Jan 5 25° 41° 3° (1981) 62° (1993) 0.11" NA
Jan 6 24° 41° 5° (1996) 62° (1950) 0.11" NA
Jan 7 24° 41° 12° (1940) 60° (1930) 0.1" NA
Jan 8 24° 41° 7° (1968) 63° (2008) 0.11" NA
Jan 9 24° 41° -1° (1968) 63° (1937) 0.11" NA
Jan 10 24° 41° 3° (2004) 63° (1998) 0.11" NA
Jan 11 24° 41° 1° (1988) 62° (1975) 0.11" NA
Jan 12 24° 41° 0° (1981) 59° (1975) 0.12" NA
Jan 13 24° 41° 5° (1981) 61° (1995) 0.11" NA
Jan 14 24° 41° 3° (1988) 67° (1995) 0.12" NA
Jan 15 24° 41° -2° (1957) 67° (1995) 0.11" NA
Jan 16 24° 41° 1° (2004) 65° (1995) 0.12" NA
Jan 17 24° 41° -1° (1982) 60° (1973) 0.12" NA
Jan 18 24° 41° -4° (1982) 65° (1973) 0.11" NA
Jan 19 24° 41° 0° (1994) 59° (1951) 0.11" NA
Jan 20 24° 41° 3° (1994) 60° (1951) 0.12" NA
Jan 21 24° 41° 0° (1985) 54° (1974) 0.12" NA
Jan 22 24° 41° -4° (1984) 56° (1932) 0.12" NA
Jan 23 24° 41° 0° (1976) 62° (1967) 0.11" NA
Jan 24 24° 41° 2° (1961) 64° (1967) 0.11" NA
Jan 25 24° 41° 3° (1945) 59° (1953) 0.11" NA
Jan 26 24° 41° 5° (1927) 65° (1950) 0.11" NA
Jan 27 24° 41° 3° (1927) 66° (1974) 0.1" NA
Jan 28 24° 41° 3° (1935) 62° (2002) 0.11" NA
Jan 29 24° 41° 4° (1977) 66° (2002) 0.1" NA
Jan 30 24° 41° 3° (1948) 69° (2002) 0.11" NA
Jan 31 24° 41° 2° (1948) 61° (1947) 0.1" NA
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