United States · 1991–2020 normal
Portsmouth in
December.
Typical December weather in Portsmouth: 5.8°C by day, -1.6°C at night, 115 mm of rain over 10.1 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high5.8°C
Typical low-1.6°C
Rain115 mm
Wet days10.1
Comfort score 5 this month (September leads the year at 83). Daylight is calculated as 9 h 10 from latitude 41.60°. Open-water sea temperature is 9.2°C (27 km from the place centre).
Event window
Frost-level nights in December
The measured night-time normal is -1.6°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5224082
- NOAA station
- USC00377581 · TIVERTON
- Station distance
- 4.4 km from the place centre
- Coverage
- Good coverage · 21 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.