Katsuura climate — normals and trends
Katsuura (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.2 °C and it receives 1,561 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 (6.8 °C). Rainfall peaks in October.
Katsuura averages 1 frost days, 14 hot days (≥ 30 °C) and 150 rainy days per year.
Katsuura has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.
The number of frost days there went from about 3 to 0 per year over the period.
The hottest day of the period reached 34.9 °C (on 9 August 2016) and the coldest -2.6 °C (on 5 February 1952).
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
KatsuuraChiba
- coords
- 35.15°, 140.32°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.2°C
Average daily high
18.6°C
Average daily low
14.0°C
Annual rainfall
1,561mm
Sunshine / day
8.3h
Mean relative humidity
75%
Average peak wind
20.4km/h
Seasonal range
19.6°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
14 d/yr
Rainy days (≥ 1 mm)
150 d/yr
Annual snowfall
5.0 cm
Average feels-like high
18.4 °C
Average feels-like low
12.8 °C
Average peak gust
41.6 km/h
Tropical nights (≥ 20 °C)
99 d/yr
Solar radiation
14.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.9 °C
since 1940
+0.2 °C per decade · r² = 0.61 · 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
34.9 °C
9 August 2016
Coldest day
-2.6 °C
5 February 1952
Wettest day
192 mm
27 October 2007
Windiest day
70.7 km/h
23 October 2017
Strongest gust
163.4 km/h
1 October 2018
Hottest feels-like
43.7 °C
6 August 2025
Coldest feels-like
-8.9 °C
11 February 1955
Snowiest day
16.8 cm
15 February 1951
Sunniest day
13.9 h
20 June 1962
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 | 10.6 °C | +1.2 °C | 52 mm | -22 mm |
| Feb | 9.9 °C | +0.5 °C | 21 mm | -67 mm |
| Mar | 14.0 °C | +1.9 °C | 156 mm | +27 mm |
| Apr | 17.8 °C | +1.3 °C | 170 mm | +53 mm |
| May | 21.0 °C | +0.4 °C | 191 mm | +57 mm |
| Jun | 26.4 °C | +2.8 °C | 105 mm | -67 mm |
| Jul | 29.6 °C | +2.5 °C | 84 mm | -50 mm |
| Aug | 30.5 °C | +1.8 °C | 83 mm | -40 mm |
| Sep | 28.5 °C | +2.8 °C | 119 mm | -59 mm |
| Oct | 21.6 °C | +0.7 °C | 210 mm | -0 mm |
| Nov | 16.8 °C | +0.2 °C | 73 mm | -54 mm |
| Dec | 13.3 °C | +1.2 °C | 97 mm | +22 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 Katsuura?
Katsuura has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.2 °C and it receives 1,561 mm of precipitation per year.
What is the hottest day ever recorded in Katsuura?
The hottest day measured in Katsuura between 1940 and 2025 was 9 August 2016, reaching 34.9 °C.
What is the coldest day in Katsuura?
The coldest day measured in Katsuura between 1940 and 2025 was 5 February 1952, at -2.6 °C.
Does it snow in Katsuura?
Yes. Katsuura gets on average 5.0 cm of snow per year and has around 1 frost days.
Has the climate of Katsuura warmed?
Yes: Katsuura warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Katsuura?
The wettest day measured in Katsuura between 1940 and 2025 was 27 October 2007, with 192 mm of rain in 24 hours.
What was the windiest day in Katsuura?
The windiest day measured in Katsuura between 1940 and 2025 was 23 October 2017, with winds reaching 70.7 km/h.
What is the warmest month in Katsuura?
The warmest month in Katsuura is August (26.4 °C on average); the coldest is January (6.8 °C).
How much does it rain in Katsuura?
Katsuura receives on average 1,561 mm of precipitation per year, spread over about 150 rainy days.
Is it sunny in Katsuura?
Katsuura 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 Katsuura?
The heaviest 24-hour snowfall measured in Katsuura between 1940 and 2025 was 15 February 1951, with 16.8 cm.
Are there tropical nights in Katsuura?
Yes: Katsuura has on average 99 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Katsuura?
In Katsuura, between 1940 and 2025, the highest apparent temperature reached 43.7 °C on 6 August 2025, and the lowest was -8.9 °C on 11 February 1955.
Compare Katsuura with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Katsuura