Komatsu climate — normals and trends
Komatsu (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.3 °C and it receives 2,106 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 (26.4 °C on average) and the coldest is January (3.6 °C). Rainfall peaks in July.
Komatsu averages 25 frost days, 14 hot days (≥ 30 °C) and 204 rainy days per year.
Komatsu 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 43 to 7 per year over the period.
The hottest day of the period reached 35.1 °C (on 15 August 2019) and the coldest -6.7 °C (on 13 February 1942).
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
KomatsuIshikawa
- coords
- 36.40°, 136.45°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.3°C
Average daily high
16.8°C
Average daily low
11.8°C
Annual rainfall
2,106mm
Sunshine / day
8.7h
Mean relative humidity
75%
Average peak wind
20.3km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
25 d/yr
Hot days (≥ 30 °C)
14 d/yr
Rainy days (≥ 1 mm)
204 d/yr
Annual snowfall
123.1 cm
Average feels-like high
15.9 °C
Average feels-like low
10.2 °C
Average peak gust
37.7 km/h
Tropical nights (≥ 20 °C)
82 d/yr
Solar radiation
14.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.0 °C
since 1940
+0.2 °C per decade · r² = 0.60 · 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
35.1 °C
15 August 2019
Coldest day
-6.7 °C
13 February 1942
Wettest day
170 mm
12 July 1972
Windiest day
77.6 km/h
28 September 1991
Strongest gust
165.2 km/h
4 September 2018
Hottest feels-like
41.1 °C
10 August 2023
Coldest feels-like
-12.6 °C
26 February 1981
Snowiest day
18.3 cm
12 March 1969
Sunniest day
14.0 h
27 May 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 | 6.9 °C | +1.2 °C | 233 mm | +16 mm |
| Feb | 5.4 °C | -0.6 °C | 209 mm | +51 mm |
| Mar | 10.5 °C | +1.2 °C | 153 mm | +9 mm |
| Apr | 15.5 °C | +0.7 °C | 105 mm | -26 mm |
| May | 19.9 °C | +0.7 °C | 142 mm | +11 mm |
| Jun | 24.7 °C | +1.9 °C | 174 mm | -5 mm |
| Jul | 30.7 °C | +3.9 °C | 40 mm | -194 mm |
| Aug | 30.5 °C | +1.8 °C | 266 mm | +110 mm |
| Sep | 28.1 °C | +3.1 °C | 226 mm | +24 mm |
| Oct | 21.0 °C | +1.5 °C | 193 mm | +38 mm |
| Nov | 15.1 °C | +0.7 °C | 154 mm | -15 mm |
| Dec | 10.8 °C | +1.8 °C | 248 mm | +17 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 Komatsu?
Komatsu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.3 °C and it receives 2,106 mm of precipitation per year.
What is the hottest day ever recorded in Komatsu?
The hottest day measured in Komatsu between 1940 and 2025 was 15 August 2019, reaching 35.1 °C.
What is the coldest day in Komatsu?
The coldest day measured in Komatsu between 1940 and 2025 was 13 February 1942, at -6.7 °C.
Does it snow in Komatsu?
Yes. Komatsu gets on average 123.1 cm of snow per year and has around 25 frost days.
Has the climate of Komatsu warmed?
Yes: Komatsu warmed by +2.0 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Komatsu?
The wettest day measured in Komatsu between 1940 and 2025 was 12 July 1972, with 170 mm of rain in 24 hours.
What was the windiest day in Komatsu?
The windiest day measured in Komatsu between 1940 and 2025 was 28 September 1991, with winds reaching 77.6 km/h.
What is the warmest month in Komatsu?
The warmest month in Komatsu is August (26.4 °C on average); the coldest is January (3.6 °C).
How much does it rain in Komatsu?
Komatsu receives on average 2,106 mm of precipitation per year, spread over about 204 rainy days.
Is it sunny in Komatsu?
Komatsu gets on average 8.7 hours of sunshine per day, roughly 3,175 hours per year over 1940-2025.
What is the biggest single-day snowfall in Komatsu?
The heaviest 24-hour snowfall measured in Komatsu between 1940 and 2025 was 12 March 1969, with 18.3 cm.
Are there tropical nights in Komatsu?
Yes: Komatsu has on average 82 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Komatsu?
In Komatsu, between 1940 and 2025, the highest apparent temperature reached 41.1 °C on 10 August 2023, and the lowest was -12.6 °C on 26 February 1981.
Compare Komatsu with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Komatsu