Climate averages 1991–2020
Muroran weather
in December.
A cold month with moderate precipitation: the 10th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cold month in Muroran: daytime highs average 0.3°C and nights cool to about -4.2°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 69 mm of precipitation on roughly 11 days, which makes December a month with moderate precipitation (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 09 min on an average December day.
The nearest other city in this atlas is Tomakomai (62 km away). In December its highs average 0.7°C, about as warm as Muroran, with 63 mm of precipitation.
Among the 303 cities listed in Japan, Muroran ranks joint 295th of 303 for the warmest December highs and joint 164th of 303 for the driest December (precipitation, lowest first). The mean December high of those 303 cities is 9.5°C; Muroran is 9.2°C cooler than that mean.
From December to January, average highs fall by 2.4°C to -2.0°C, and monthly precipitation falls from 69 mm to 51 mm.
The annual picture
December in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Muroran climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -2.0°C-6.8°C | -6.8°C | 51 | 8.5 | 9.59 h |
| February | -1.4°C-6.3°C | -6.3°C | 44 | 7.4 | 10.511 h |
| March | 2.0°C-3.4°C | -3.4°C | 57 | 9.1 | 11.912 h |
| April | 7.5°C1.3°C | 1.3°C | 76 | 9.1 | 13.313 h |
| May | 13.2°C7.0°C | 7.0°C | 112 | 11.1 | 14.615 h |
| June | 17.4°C12.2°C | 12.2°C | 104 | 10.3 | 15.215 h |
| July | 21.3°C16.7°C | 16.7°C | 153 | 13.0 | 14.915 h |
| August | 23.0°C18.7°C | 18.7°C | 181 | 12.6 | 13.914 h |
| September | 20.2°C15.6°C | 15.6°C | 166 | 13.0 | 12.513 h |
| October | 14.1°C8.9°C | 8.9°C | 103 | 10.9 | 11.111 h |
| November | 6.7°C1.9°C | 1.9°C | 80 | 11.0 | 9.810 h |
| December, selected | 0.3°C-4.2°C | -4.2°C | 69 | 11.0 | 9.19 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Tomakomai in DecemberJapan · 62 kmHigh 0.7°C · Low -4.2°C · 63 mm precipitation
- Hakodate in DecemberJapan · 64 kmHigh 2.1°C · Low -2.2°C · 70 mm rain
- Chitose in DecemberJapan · 78 kmHigh 0.5°C · Low -5.6°C · 54 mm precipitation
- Eniwa in DecemberJapan · 80 kmHigh -0.3°C · Low -6.5°C · 62 mm precipitation
- Sapporo in DecemberJapan · 88 kmHigh -0.3°C · Low -5.3°C · 73 mm precipitation
- Otaru in DecemberJapan · 97 kmHigh 0.3°C · Low -2.7°C · 125 mm precipitation
- Ebetsu in DecemberJapan · 99 kmHigh -0.9°C · Low -7.1°C · 62 mm precipitation
- Iwamizawa in DecemberJapan · 117 kmHigh -0.8°C · Low -8.0°C · 69 mm precipitation
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Muroran) is explained once on the Muroran year overview and on the Sources, method and limits page.