Groton Weather in December
Average highs run from 34°F on December 1 to 23°F on December 31, and lows from 16°F to 6°F. Normal precipitation for the month is 0.81 in.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 28°F
- Average low
- 11°F
- Precipitation
- 0.81 in
- Snowfall
- 8.1 in
- Record high
- 63°FDec 1, 2021
- Record low
- -35°FDec 18, 2016
- Chance of a freeze
- 100%
- Daylight
- 8 h 59 min to 8 h 47 min
- Cloud cover
- 65%
- Humidity
- 85%
- Dew point
- 15°F
- Wind
- 10.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 34°F | 16°F | 63°F 2021 | -15°F 2014 | 10% | |
| Dec 2 | 33°F | 16°F | 55°F 2012 | -12°F 2025 | 10% | |
| Dec 3 | 33°F | 15°F | 53°F 2012 | -12°F 2025 | 11% | |
| Dec 4 | 32°F | 15°F | 49°F 2020 | -16°F 2025 | 11% | |
| Dec 5 | 32°F | 14°F | 50°F 2020 | -7°F 2011 | 11% | |
| Dec 6 | 31°F | 14°F | 61°F 2023 | -10°F 2011 | 12% | |
| Dec 7 | 31°F | 14°F | 57°F 2023 | -10°F 2025 | 12% | |
| Dec 8 | 31°F | 13°F | 59°F 2020 | -7°F 2016 | 12% | |
| Dec 9 | 30°F | 13°F | 50°F 2020 | -8°F 2011 | 13% | |
| Dec 10 | 30°F | 13°F | 48°F 2015 | -15°F 2012 | 13% | |
| Dec 11 | 29°F | 12°F | 43°F 2011 | -17°F 2016 | 13% | |
| Dec 12 | 29°F | 12°F | 47°F 2017 | -18°F 2016 | 14% | |
| Dec 13 | 28°F | 11°F | 49°F 2014 | -16°F 2016 | 14% | |
| Dec 14 | 28°F | 11°F | 49°F 2023 | -16°F 2016 | 14% | |
| Dec 15 | 28°F | 11°F | 46°F 2018 | -21°F 2016 | 14% | |
| Dec 16 | 27°F | 10°F | 49°F 2025 | -3°F 2016 | 14% | |
| Dec 17 | 27°F | 10°F | 44°F 2018 | -30°F 2016 | 14% | |
| Dec 18 | 26°F | 10°F | 56°F 2011 | -35°F 2016 | 14% | |
| Dec 19 | 26°F | 9°F | 46°F 2018 | -11°F 2022 | 15% | |
| Dec 20 | 26°F | 9°F | 44°F 2023 | -12°F 2022 | 15% | |
| Dec 21 | 25°F | 9°F | 43°F 2023 | -16°F 2022 | 15% | |
| Dec 22 | 25°F | 8°F | 56°F 2020 | -20°F 2022 | 15% | |
| Dec 23 | 25°F | 8°F | 53°F 2023 | -14°F 2022 | 15% | |
| Dec 24 | 24°F | 8°F | 44°F 2023 | -19°F 2022 | 15% | |
| Dec 25 | 24°F | 8°F | 43°F 2011 | -20°F 2022 | 15% | |
| Dec 26 | 24°F | 7°F | 51°F 2011 | -17°F 2017 | 15% | |
| Dec 27 | 24°F | 7°F | 45°F 2024 | -18°F 2017 | 15% | |
| Dec 28 | 23°F | 7°F | 44°F 2011 | -21°F 2021 | 15% | |
| Dec 29 | 23°F | 7°F | 49°F 2024 | -20°F 2018 | 15% | |
| Dec 30 | 23°F | 6°F | 39°F 2025 | -25°F 2017 | 14% | |
| Dec 31 | 23°F | 6°F | 37°F 2011 | -28°F 2017 | 14% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- December 1
- sunrise 7:52 AM, sunset 4:51 PM
- December 31
- sunrise 8:12 AM, sunset 4:59 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00390120 (Andover #2), public domain. Records: NOAA GHCN-Daily, station USC00390022, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.