December weather in Port Jefferson, NY
The average temperature in Port Jefferson in December is 39.1°F (32.1°F–46.1°F). Average precipitation: 4.56 inches.
December is a winter month in Port Jefferson, and is cooler than the annual average of 54.7°F. Daily temperatures swing about 14°F between overnight low and afternoon high. Daylight averages about 9h 4m. For travel, December is cool.
Avg High
46.1°F
Avg Low
32.1°F
Precipitation
4.56 in
Daylight
9h 4m
December records in Port Jefferson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 71.1°F (2001) | 25.0°F (2024) | 1.45 in (2010) |
| December 2 | 64.9°F (2006) | 25.0°F (2024) | 0.63 in (2019) |
| December 3 | 60.1°F (2015) | 18.0°F (2003) | 1.12 in (2018) |
| December 4 | 60.1°F (2001) | 19.9°F (2003) | 0.60 in (2023) |
| December 5 | 66.9°F (2001) | 23.0°F (2024) | 1.40 in (2020) |
| December 6 | 71.1°F (2001) | 19.0°F (2006) | 2.55 in (2003) |
| December 7 | 66.0°F (2011) | 23.0°F (2003) | 1.17 in (2022) |
| December 8 | 64.9°F (2011) | 17.1°F (2019) | 0.53 in (2011) |
| December 9 | 60.1°F (2019) | 23.0°F (2003) | 1.64 in (2014) |
| December 10 | 68.0°F (2012) | 12.0°F (2010) | 1.23 in (2019) |
| December 11 | 69.1°F (2012) | 21.9°F (2018) | 3.40 in (2023) |
| December 12 | 66.0°F (2024) | 21.9°F (2011) | 1.87 in (2010) |
| December 13 | 64.9°F (2015) | 19.0°F (2013) | 1.10 in (2010) |
| December 14 | 61.0°F (2019) | 21.0°F (2017) | 2.37 in (2019) |
| December 15 | 66.9°F (2015) | 12.0°F (2017) | 2.49 in (2003) |
| December 16 | 61.0°F (2018) | 18.0°F (2016) | 1.26 in (2022) |
| December 17 | 62.1°F (2018) | 17.1°F (2013) | 1.78 in (2020) |
| December 18 | 66.9°F (2016) | 19.9°F (2010) | 1.42 in (2023) |
| December 19 | 60.1°F (2023) | 18.0°F (2011) | 1.32 in (2023) |
| December 20 | 54.0°F (2017) | 21.0°F (2016) | 0.70 in (2025) |
| December 21 | 63.0°F (2012) | 21.0°F (2003) | 1.91 in (2018) |
| December 22 | 64.0°F (2013) | 16.0°F (2024) | 0.39 in (2015) |
| December 23 | 66.9°F (2015) | 12.9°F (2024) | 1.27 in (2006) |
| December 24 | 70.0°F (2015) | 12.0°F (2024) | 1.33 in (2015) |
| December 25 | 70.0°F (2015) | 19.0°F (2013) | 1.87 in (2020) |
| December 26 | 70.0°F (2015) | 21.9°F (2013) | 0.57 in (2010) |
| December 27 | 64.0°F (2015) | 19.0°F (2017) | 1.10 in (2012) |
| December 28 | 64.0°F (2015) | 12.0°F (2017) | 1.25 in (2018) |
| December 29 | 63.0°F (2023) | 10.0°F (2017) | 1.40 in (2013) |
| December 30 | 62.1°F (2019) | 12.0°F (2017) | 1.10 in (2019) |
| December 31 | 60.1°F (2024) | 12.9°F (2017) | 0.53 in (2020) |