Yakumo climate — normals and trends
Yakumo (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 7.5 °C and it receives 1,344 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 (20.9 °C on average) and the coldest is January (-3.5 °C). Rainfall peaks in August.
Yakumo averages 123 frost days, 0 hot days (≥ 30 °C) and 162 rainy days per year.
Yakumo has warmed by +2.2 °C between 1940 and 2025, or +0.26 °C per decade. This trend is statistically significant.
The number of frost days there went from about 140 to 106 per year over the period.
The hottest day of the period reached 28.2 °C (on 26 August 2023) and the coldest -13.1 °C (on 12 January 1961).
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
YakumoHokkaido
- coords
- 42.25°, 140.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
7.5°C
Average daily high
9.3°C
Average daily low
5.8°C
Annual rainfall
1,344mm
Sunshine / day
8.2h
Mean relative humidity
80%
Average peak wind
21.2km/h
Seasonal range
24.4°C
Frost days (< 0 °C)
123 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
162 d/yr
Annual snowfall
176.6 cm
Average feels-like high
6.9 °C
Average feels-like low
2.6 °C
Average peak gust
35.2 km/h
Tropical nights (≥ 20 °C)
17 d/yr
Solar radiation
13.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.46 · 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
28.2 °C
26 August 2023
Coldest day
-13.1 °C
12 January 1961
Wettest day
138 mm
16 September 1998
Windiest day
78.1 km/h
8 September 2004
Strongest gust
131.8 km/h
8 September 2004
Hottest feels-like
34.6 °C
25 August 2023
Coldest feels-like
-22.9 °C
14 January 1967
Snowiest day
42.8 cm
31 January 1970
Sunniest day
14.9 h
18 June 1947
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 | 1.0 °C | +2.9 °C | 81 mm | +14 mm |
| Feb | 1.1 °C | +2.6 °C | 76 mm | +16 mm |
| Mar | 3.7 °C | +2.2 °C | 94 mm | +20 mm |
| Apr | 8.3 °C | +2.6 °C | 133 mm | +37 mm |
| May | 13.4 °C | +2.6 °C | 78 mm | -32 mm |
| Jun | 19.1 °C | +3.2 °C | 130 mm | +16 mm |
| Jul | 24.4 °C | +4.3 °C | 112 mm | -53 mm |
| Aug | 25.4 °C | +2.8 °C | 226 mm | +42 mm |
| Sep | 22.6 °C | +2.9 °C | 243 mm | +65 mm |
| Oct | 14.6 °C | +1.5 °C | 78 mm | -42 mm |
| Nov | 8.8 °C | +3.3 °C | 127 mm | +30 mm |
| Dec | 3.2 °C | +2.9 °C | 140 mm | +60 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 Yakumo?
Yakumo has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 7.5 °C and it receives 1,344 mm of precipitation per year.
What is the hottest day ever recorded in Yakumo?
The hottest day measured in Yakumo between 1940 and 2025 was 26 August 2023, reaching 28.2 °C.
What is the coldest day in Yakumo?
The coldest day measured in Yakumo between 1940 and 2025 was 12 January 1961, at -13.1 °C.
Does it snow in Yakumo?
Yes. Yakumo gets on average 176.6 cm of snow per year and has around 123 frost days.
Has the climate of Yakumo warmed?
Yes: Yakumo warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Yakumo?
The wettest day measured in Yakumo between 1940 and 2025 was 16 September 1998, with 138 mm of rain in 24 hours.
What was the windiest day in Yakumo?
The windiest day measured in Yakumo between 1940 and 2025 was 8 September 2004, with winds reaching 78.1 km/h.
What is the warmest month in Yakumo?
The warmest month in Yakumo is August (20.9 °C on average); the coldest is January (-3.5 °C).
How much does it rain in Yakumo?
Yakumo receives on average 1,344 mm of precipitation per year, spread over about 162 rainy days.
Is it sunny in Yakumo?
Yakumo gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Yakumo?
The heaviest 24-hour snowfall measured in Yakumo between 1940 and 2025 was 31 January 1970, with 42.8 cm.
Are there tropical nights in Yakumo?
Yes: Yakumo has on average 17 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Yakumo?
In Yakumo, between 1940 and 2025, the highest apparent temperature reached 34.6 °C on 25 August 2023, and the lowest was -22.9 °C on 14 January 1967.
Compare Yakumo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Yakumo