December weather in Islandia, NY
The average temperature in Islandia in December is 37.1°F (29.8°F–44.4°F). Average precipitation: 4.71 inches. Average snowfall is 4.5 inches.
December is a winter month in Islandia, and is cooler than the annual average of 53.1°F. Daily temperatures swing about 14.6°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 5m. For travel, December is cold.
Avg High
44.4°F
Avg Low
29.8°F
Precipitation
4.71 in
Snow
4.5 in
December records in Islandia
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (2001) | 15.1°F (1976) | 1.41 in (1977) |
| December 2 | 60.1°F (1985) | 12.0°F (1989) | 2.20 in (1974) |
| December 3 | 66.9°F (1998) | 8.1°F (1976) | 1.41 in (1967) |
| December 4 | 73.0°F (1998) | 12.9°F (1966) | 2.45 in (1964) |
| December 5 | 70.0°F (2001) | 12.9°F (1966) | 2.27 in (1993) |
| December 6 | 66.9°F (1998) | 12.9°F (2002) | 1.87 in (1996) |
| December 7 | 77.0°F (1998) | 8.1°F (2002) | 1.64 in (1996) |
| December 8 | 62.1°F (1980) | 15.1°F (1970) | 1.58 in (1974) |
| December 9 | 66.0°F (1991) | 8.1°F (1968) | 2.14 in (2014) |
| December 10 | 61.0°F (2015) | 6.1°F (1968) | 1.59 in (2023) |
| December 11 | 64.9°F (1971) | 5.0°F (1968) | 2.65 in (1992) |
| December 12 | 68.0°F (2015) | 7.0°F (1988) | 2.44 in (2010) |
| December 13 | 68.0°F (2015) | 5.0°F (1982) | 1.53 in (1988) |
| December 14 | 62.1°F (2015) | 5.0°F (1982) | 1.62 in (1977) |
| December 15 | 62.1°F (2015) | 10.9°F (1968) | 1.55 in (2013) |
| December 16 | 64.0°F (1971) | 10.0°F (1968) | 1.49 in (2024) |
| December 17 | 62.1°F (1984) | 12.9°F (1991) | 1.14 in (1970) |
| December 18 | 61.0°F (2023) | 12.9°F (1980) | 1.65 in (2023) |
| December 19 | 59.0°F (2025) | 9.0°F (1989) | 0.92 in (1996) |
| December 20 | 57.9°F (1999) | 7.0°F (1963) | 1.34 in (1995) |
| December 21 | 60.1°F (2018) | 9.0°F (2004) | 1.81 in (1973) |
| December 22 | 61.0°F (2013) | 9.0°F (1989) | 1.43 in (1969) |
| December 23 | 64.0°F (2015) | 8.1°F (1989) | 1.63 in (2015) |
| December 24 | 64.0°F (2015) | 6.1°F (1983) | 1.00 in (2014) |
| December 25 | 64.9°F (2015) | 3.0°F (1983) | 1.29 in (2002) |
| December 26 | 64.0°F (1982) | 5.0°F (1968) | 1.36 in (1975) |
| December 27 | 62.1°F (1973) | 8.1°F (1989) | 0.93 in (1969) |
| December 28 | 55.9°F (1971) | 3.0°F (1966) | 3.04 in (2023) |
| December 29 | 64.9°F (1984) | 10.9°F (1963) | 1.56 in (2013) |
| December 30 | 61.0°F (2024) | 1.0°F (1963) | 1.33 in (1971) |
| December 31 | 59.0°F (1965) | -0.9°F (1963) | 1.26 in (2018) |