United States · 1991–2020 normal
Portsmouth in
December.
Typical December weather in Portsmouth: 4°C by day, -5.4°C at night, 120 mm of rain over 9.5 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high4°C
Typical low-5.4°C
Rain120 mm
Wet days9.5
Comfort score 5 this month (August leads the year at 78). Daylight is calculated as 9 h 01 from latitude 43.08°. Open-water sea temperature is 7.4°C (12 km from the place centre).
Event window
Frost-level nights in December
The measured night-time normal is -5.4°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5091383
- NOAA station
- USC00273626 · GREENLAND
- Station distance
- 8.3 km from the place centre
- Coverage
- Strong coverage · 29 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.