Japan · 1991–2020 normal
Iwanai in
December.
Typical December weather in Iwanai: 2.4°C by day, -2.9°C at night, 150 mm of rain over 23.8 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high2.4°C
Typical low-2.9°C
Rain150 mm
Wet days23.8
Comfort score 5 this month (July leads the year at 77). Daylight is calculated as 9 h 01 from latitude 42.97°. Open-water sea temperature is 9.6°C (16 km from the place centre).
Event window
Frost-level nights in December
The measured night-time normal is -2.9°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 2129868
- NOAA station
- JA000047421 · SUTTSU
- Station distance
- 30.7 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.