Katsuyama climate — normals and trends
Katsuyama (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.0 °C and it receives 2,470 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 (22.8 °C on average) and the coldest is January (-2.4 °C). Rainfall peaks in July.
Katsuyama averages 117 frost days, 3 hot days (≥ 30 °C) and 210 rainy days per year.
Katsuyama has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.
The number of frost days there went from about 137 to 97 per year over the period.
The hottest day of the period reached 32.6 °C (on 1 August 2022) and the coldest -16.6 °C (on 14 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
KatsuyamaFukui
- coords
- 36.06°, 136.50°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.0°C
Average daily high
13.9°C
Average daily low
6.2°C
Annual rainfall
2,470mm
Sunshine / day
8.4h
Mean relative humidity
81%
Average peak wind
12.7km/h
Seasonal range
25.2°C
Frost days (< 0 °C)
117 d/yr
Hot days (≥ 30 °C)
3 d/yr
Rainy days (≥ 1 mm)
210 d/yr
Annual snowfall
269.9 cm
Average feels-like high
13.1 °C
Average feels-like low
4.5 °C
Average peak gust
44.3 km/h
Tropical nights (≥ 20 °C)
29 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.8 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
32.6 °C
1 August 2022
Coldest day
-16.6 °C
14 February 1942
Wettest day
167 mm
14 August 2021
Windiest day
51.5 km/h
4 September 2018
Strongest gust
203.8 km/h
4 September 2018
Hottest feels-like
38.4 °C
5 August 2019
Coldest feels-like
-21.2 °C
3 February 1944
Snowiest day
32.2 cm
31 January 1970
Sunniest day
14.0 h
29 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 | 1.8 °C | +0.8 °C | 168 mm | -6 mm |
| Feb | 0.6 °C | -1.1 °C | 160 mm | +10 mm |
| Mar | 6.5 °C | +0.7 °C | 157 mm | -17 mm |
| Apr | 13.6 °C | +0.9 °C | 139 mm | -43 mm |
| May | 19.2 °C | +1.1 °C | 209 mm | +14 mm |
| Jun | 23.9 °C | +2.4 °C | 274 mm | +3 mm |
| Jul | 28.9 °C | +3.6 °C | 104 mm | -241 mm |
| Aug | 28.6 °C | +2.0 °C | 319 mm | +111 mm |
| Sep | 26.0 °C | +3.3 °C | 276 mm | +25 mm |
| Oct | 18.9 °C | +2.0 °C | 239 mm | +61 mm |
| Nov | 11.9 °C | +1.0 °C | 113 mm | -43 mm |
| Dec | 5.9 °C | +1.7 °C | 202 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 Katsuyama?
Katsuyama has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.0 °C and it receives 2,470 mm of precipitation per year.
What is the hottest day ever recorded in Katsuyama?
The hottest day measured in Katsuyama between 1940 and 2025 was 1 August 2022, reaching 32.6 °C.
What is the coldest day in Katsuyama?
The coldest day measured in Katsuyama between 1940 and 2025 was 14 February 1942, at -16.6 °C.
Does it snow in Katsuyama?
Yes. Katsuyama gets on average 269.9 cm of snow per year and has around 117 frost days.
Has the climate of Katsuyama warmed?
Yes: Katsuyama warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Katsuyama?
The wettest day measured in Katsuyama between 1940 and 2025 was 14 August 2021, with 167 mm of rain in 24 hours.
What was the windiest day in Katsuyama?
The windiest day measured in Katsuyama between 1940 and 2025 was 4 September 2018, with winds reaching 51.5 km/h.
What is the warmest month in Katsuyama?
The warmest month in Katsuyama is August (22.8 °C on average); the coldest is January (-2.4 °C).
How much does it rain in Katsuyama?
Katsuyama receives on average 2,470 mm of precipitation per year, spread over about 210 rainy days.
Is it sunny in Katsuyama?
Katsuyama gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Katsuyama?
The heaviest 24-hour snowfall measured in Katsuyama between 1940 and 2025 was 31 January 1970, with 32.2 cm.
Are there tropical nights in Katsuyama?
Yes: Katsuyama has on average 29 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Katsuyama?
In Katsuyama, between 1940 and 2025, the highest apparent temperature reached 38.4 °C on 5 August 2019, and the lowest was -21.2 °C on 3 February 1944.
Compare Katsuyama with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Katsuyama