Mombetsu climate — normals and trends
Mombetsu (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 5.8 °C and it receives 1,008 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is August (19.4 °C on average) and the coldest is January (-7.8 °C). Rainfall peaks in August.
Mombetsu averages 157 frost days, 2 hot days (≥ 30 °C) and 142 rainy days per year.
Mombetsu has warmed by +2.0 °C between 1940 and 2025, or +0.24 °C per decade. This trend is statistically significant.
The number of frost days there went from about 168 to 146 per year over the period.
The hottest day of the period reached 34.8 °C (on 26 May 2019) and the coldest -29.7 °C (on 25 January 1985).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
MombetsuHokkaido
- coords
- 44.35°, 143.35°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
5.8°C
Average daily high
9.7°C
Average daily low
1.9°C
Annual rainfall
1,008mm
Sunshine / day
8.6h
Mean relative humidity
77%
Average peak wind
17.0km/h
Seasonal range
27.2°C
Frost days (< 0 °C)
157 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
142 d/yr
Annual snowfall
223.2 cm
Average feels-like high
7.4 °C
Average feels-like low
-1.2 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
6 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.52 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
34.8 °C
26 May 2019
Coldest day
-29.7 °C
25 January 1985
Wettest day
133 mm
16 September 1998
Windiest day
59.5 km/h
27 September 1954
Strongest gust
142.6 km/h
8 September 2004
Hottest feels-like
40.2 °C
23 August 2023
Coldest feels-like
-34.8 °C
25 January 1985
Snowiest day
52.2 cm
13 January 1953
Sunniest day
15.0 h
19 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | -1.9 °C | +2.6 °C | 54 mm | -9 mm |
| Feb | -1.0 °C | +2.7 °C | 54 mm | +1 mm |
| Mar | 2.4 °C | +1.4 °C | 71 mm | +2 mm |
| Apr | 9.6 °C | +0.9 °C | 134 mm | +64 mm |
| May | 17.8 °C | +3.1 °C | 55 mm | -26 mm |
| Jun | 23.4 °C | +5.7 °C | 69 mm | -15 mm |
| Jul | 28.6 °C | +7.0 °C | 73 mm | -34 mm |
| Aug | 26.1 °C | +3.1 °C | 166 mm | +27 mm |
| Sep | 23.4 °C | +3.7 °C | 141 mm | +26 mm |
| Oct | 13.5 °C | -0.1 °C | 61 mm | -30 mm |
| Nov | 6.2 °C | +0.8 °C | 133 mm | +61 mm |
| Dec | 0.5 °C | +1.8 °C | 131 mm | +68 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Mombetsu?
Mombetsu has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 5.8 °C and it receives 1,008 mm of precipitation per year.
What is the hottest day ever recorded in Mombetsu?
The hottest day measured in Mombetsu between 1940 and 2025 was 26 May 2019, reaching 34.8 °C.
What is the coldest day in Mombetsu?
The coldest day measured in Mombetsu between 1940 and 2025 was 25 January 1985, at -29.7 °C.
Does it snow in Mombetsu?
Yes. Mombetsu gets on average 223.2 cm of snow per year and has around 157 frost days.
Has the climate of Mombetsu warmed?
Yes: Mombetsu warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Mombetsu?
The wettest day measured in Mombetsu between 1940 and 2025 was 16 September 1998, with 133 mm of rain in 24 hours.
What was the windiest day in Mombetsu?
The windiest day measured in Mombetsu between 1940 and 2025 was 27 September 1954, with winds reaching 59.5 km/h.
What is the warmest month in Mombetsu?
The warmest month in Mombetsu is August (19.4 °C on average); the coldest is January (-7.8 °C).
How much does it rain in Mombetsu?
Mombetsu receives on average 1,008 mm of precipitation per year, spread over about 142 rainy days.
Is it sunny in Mombetsu?
Mombetsu gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.
What is the biggest single-day snowfall in Mombetsu?
The heaviest 24-hour snowfall measured in Mombetsu between 1940 and 2025 was 13 January 1953, with 52.2 cm.
Are there tropical nights in Mombetsu?
Yes: Mombetsu has on average 6 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Mombetsu?
In Mombetsu, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 23 August 2023, and the lowest was -34.8 °C on 25 January 1985.
Compare Mombetsu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Mombetsu