Finland · 1991–2020 normal
Sysmä in
December.
Typical December weather in Sysmä: -1.1°C by day, -5.6°C at night, 42 mm of rain over 10.4 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high-1.1°C
Typical low-5.6°C
Rain42 mm
Wet days10.4
Comfort score 5 this month (July leads the year at 78). Daylight is calculated as 5 h 24 from latitude 61.50°.
Event window
Long northern nights in December
At 61.5° the calculated mid-month daylight is 5 h 24. 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 635336
- NOAA station
- FIE00142881 · ASIKKALA PULKKILANHARJU-1
- Station distance
- 23.4 km from the place centre
- Coverage
- Good coverage · 17 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.