Finland · 1991–2020 normal
Harjavalta in
December.
Typical December weather in Harjavalta: -0.3°C by day, -5.4°C at night, 53 mm of rain over 11.2 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high-0.3°C
Typical low-5.4°C
Rain53 mm
Wet days11.2
Comfort score 5 this month (July leads the year at 77). Daylight is calculated as 5 h 28 from latitude 61.32°. Open-water sea temperature is 4.1°C (41 km from the place centre).
Event window
Long northern nights in December
At 61.3° the calculated mid-month daylight is 5 h 28. That darkness, not an aurora observation, is why this latitude is sought for northern or southern lights in December. Typical nights are -5.4°C.
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 658921
- NOAA station
- FIE00142526 · KOKEMAKI PEIPOHJA HYRKOLA
- Station distance
- 8.1 km from the place centre
- Coverage
- Good coverage · 19 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.