Kamiiso climate — normals and trends
Kamiiso (Japan) has a warm-summer humid continental climate (Dfb) under the Köppen-Geiger classification. Its mean annual temperature is 8.2 °C and it receives 1,337 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 (21.3 °C on average) and the coldest is January (-2.5 °C). Rainfall peaks in August.
Kamiiso averages 109 frost days, 0 hot days (≥ 30 °C) and 141 rainy days per year.
Kamiiso has warmed by +2.0 °C between 1940 and 2025, or +0.23 °C per decade. This trend is statistically significant.
The number of frost days there went from about 124 to 94 per year over the period.
The hottest day of the period reached 28.9 °C (on 26 August 2023) and the coldest -11.7 °C (on 2 February 1996).
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
KamiisoHokkaido
- coords
- 41.82°, 140.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
8.2°C
Average daily high
9.9°C
Average daily low
6.6°C
Annual rainfall
1,337mm
Sunshine / day
8.3h
Mean relative humidity
80%
Average peak wind
23.1km/h
Seasonal range
23.8°C
Frost days (< 0 °C)
109 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
118.9 cm
Average feels-like high
7.4 °C
Average feels-like low
3.3 °C
Average peak gust
34.8 km/h
Tropical nights (≥ 20 °C)
25 d/yr
Solar radiation
13.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.30 · 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
28.9 °C
26 August 2023
Coldest day
-11.7 °C
2 February 1996
Wettest day
140 mm
21 August 1968
Windiest day
74.1 km/h
8 September 2004
Strongest gust
121.3 km/h
27 September 1954
Hottest feels-like
36.0 °C
24 August 2023
Coldest feels-like
-20.1 °C
14 January 1967
Snowiest day
33.9 cm
16 February 1991
Sunniest day
14.9 h
10 June 1940
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 | 2.4 °C | +3.2 °C | 65 mm | +8 mm |
| Feb | 2.5 °C | +3.0 °C | 57 mm | +2 mm |
| Mar | 5.1 °C | +2.7 °C | 116 mm | +44 mm |
| Apr | 9.0 °C | +2.4 °C | 155 mm | +62 mm |
| May | 13.2 °C | +1.9 °C | 80 mm | -30 mm |
| Jun | 18.4 °C | +3.0 °C | 96 mm | -28 mm |
| Jul | 23.8 °C | +4.1 °C | 86 mm | -91 mm |
| Aug | 25.6 °C | +3.1 °C | 192 mm | -5 mm |
| Sep | 23.2 °C | +2.9 °C | 237 mm | +50 mm |
| Oct | 15.5 °C | +1.7 °C | 59 mm | -58 mm |
| Nov | 10.0 °C | +3.7 °C | 149 mm | +65 mm |
| Dec | 4.8 °C | +3.4 °C | 146 mm | +81 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 Kamiiso?
Kamiiso has a warm-summer humid continental climate (Köppen Dfb). Over 1940-2025, the average annual temperature is 8.2 °C and it receives 1,337 mm of precipitation per year.
What is the hottest day ever recorded in Kamiiso?
The hottest day measured in Kamiiso between 1940 and 2025 was 26 August 2023, reaching 28.9 °C.
What is the coldest day in Kamiiso?
The coldest day measured in Kamiiso between 1940 and 2025 was 2 February 1996, at -11.7 °C.
Does it snow in Kamiiso?
Yes. Kamiiso gets on average 118.9 cm of snow per year and has around 109 frost days.
Has the climate of Kamiiso warmed?
Yes: Kamiiso warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kamiiso?
The wettest day measured in Kamiiso between 1940 and 2025 was 21 August 1968, with 140 mm of rain in 24 hours.
What was the windiest day in Kamiiso?
The windiest day measured in Kamiiso between 1940 and 2025 was 8 September 2004, with winds reaching 74.1 km/h.
What is the warmest month in Kamiiso?
The warmest month in Kamiiso is August (21.3 °C on average); the coldest is January (-2.5 °C).
How much does it rain in Kamiiso?
Kamiiso receives on average 1,337 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Kamiiso?
Kamiiso gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kamiiso?
The heaviest 24-hour snowfall measured in Kamiiso between 1940 and 2025 was 16 February 1991, with 33.9 cm.
Are there tropical nights in Kamiiso?
Yes: Kamiiso has on average 25 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kamiiso?
In Kamiiso, between 1940 and 2025, the highest apparent temperature reached 36.0 °C on 24 August 2023, and the lowest was -20.1 °C on 14 January 1967.
Compare Kamiiso with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kamiiso