Finland · 1991–2020 normal
Heinola in
December.
Typical December weather in Heinola: -1.1°C by day, -5.6°C at night, 50 mm of rain over 11.8 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high-1.1°C
Typical low-5.6°C
Rain50 mm
Wet days11.8
Comfort score 5 this month (July leads the year at 81). Daylight is calculated as 5 h 30 from latitude 61.21°.
Event window
Long northern nights in December
At 61.2° the calculated mid-month daylight is 5 h 30. That darkness, not an aurora observation, is why this latitude is sought for northern or southern lights in December. Typical nights are -5.6°C.
Event window
Frost-level nights in December
The measured night-time normal is -5.6°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 658288
- NOAA station
- FIE00143066 · HEINOLA ASEMANTAUS
- Station distance
- 1 km from the place centre
- Coverage
- Strong coverage · 30 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.