United States · 1991–2020 normal
Groton in
December.
Typical December weather in Groton: -2.8°C by day, -12.2°C at night, 25 mm of rain over 4.6 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high-2.8°C
Typical low-12.2°C
Rain25 mm
Wet days4.6
Comfort score 5 this month (August leads the year at 83). Daylight is calculated as 8 h 44 from latitude 45.45°.
Event window
Frost-level nights in December
The measured night-time normal is -12.2°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5228242
- NOAA station
- USC00390120 · ANDOVER #2
- Station distance
- 15.5 km from the place centre
- Coverage
- Good coverage · 16 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.