December weather in Cortland, NY
The average temperature in Cortland in December is 28.1°F (21.2°F–34.9°F). Average precipitation: 2.66 inches. Average snowfall is 12.7 inches.
December is a winter month in Cortland, and is cooler than the annual average of 45.2°F. Daily temperatures swing about 13.7°F between overnight low and afternoon high. Expect about 14 days with precipitation. Daylight averages about 8h 53m. For travel, December is cold.
Avg High
34.9°F
Avg Low
21.2°F
Precipitation
2.66 in
Snow
12.7 in
December records in Cortland
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 54.0°F (2014) | 6.1°F (2013) | 0.90 in (2001) |
| December 2 | 48.0°F (2023) | 17.1°F (2014) | 1.04 in (1996) |
| December 3 | 51.1°F (2021) | 10.9°F (2025) | 0.90 in (1986) |
| December 4 | 54.0°F (2012) | 12.9°F (2024) | 1.05 in (1990) |
| December 5 | 64.9°F (2012) | -4.0°F (2025) | 1.05 in (1964) |
| December 6 | 54.0°F (2013) | 0.0°F (2025) | 0.69 in (1973) |
| December 7 | 51.1°F (2022) | 19.9°F (2024) | 0.85 in (1976) |
| December 8 | 53.1°F (2022) | -0.9°F (2019) | 0.61 in (1974) |
| December 9 | 48.9°F (2023) | -2.9°F (2025) | 1.23 in (1963) |
| December 10 | 53.1°F (2023) | -2.9°F (2025) | 0.79 in (2012) |
| December 11 | 51.1°F (2012) | 8.1°F (2016) | 1.83 in (1952) |
| December 12 | 57.9°F (2021) | -0.9°F (2013) | 0.90 in (2007) |
| December 13 | 55.0°F (2015) | 3.9°F (2022) | 1.46 in (1983) |
| December 14 | 61.0°F (2015) | 3.9°F (2022) | 1.84 in (1983) |
| December 15 | 62.1°F (2015) | -4.0°F (2017) | 1.16 in (1954) |
| December 16 | 54.0°F (2023) | -0.9°F (2017) | 1.02 in (2005) |
| December 17 | 61.0°F (2021) | -8.0°F (2013) | 1.11 in (1970) |
| December 18 | 51.1°F (2023) | 9.0°F (2013) | 1.55 in (2023) |
| December 19 | 51.1°F (2025) | -0.9°F (2020) | 0.57 in (1990) |
| December 20 | 51.1°F (2025) | 0.0°F (2016) | 0.45 in (1995) |
| December 21 | 54.0°F (2013) | 1.0°F (2016) | 1.02 in (2012) |
| December 22 | 64.0°F (2013) | 1.9°F (2024) | 0.62 in (2011) |
| December 23 | 63.0°F (2013) | -7.1°F (2024) | 1.05 in (1995) |
| December 24 | 62.1°F (2015) | 0.0°F (2022) | 0.71 in (1990) |
| December 25 | 64.0°F (2015) | 1.0°F (2022) | 1.55 in (2020) |
| December 26 | 59.0°F (2015) | 5.0°F (2012) | 0.78 in (1975) |
| December 27 | 51.1°F (2015) | 0.0°F (2017) | 0.80 in (1957) |
| December 28 | 54.0°F (2015) | 1.0°F (2017) | 0.85 in (1968) |
| December 29 | 55.0°F (2023) | 1.0°F (2017) | 0.36 in (2015) |
| December 30 | 60.1°F (2024) | -2.0°F (2017) | 0.80 in (1954) |
| December 31 | 59.0°F (2022) | -6.0°F (2017) | 0.68 in (1992) |