Sōka climate — normals and trends
Sōka (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.3 °C and it receives 1,376 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 (26.9 °C on average) and the coldest is January (4.1 °C). Rainfall peaks in October.
Sōka averages 34 frost days, 36 hot days (≥ 30 °C) and 134 rainy days per year.
Sōka 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 55 to 13 per year over the period.
The hottest day of the period reached 39.3 °C (on 23 July 2018) and the coldest -13.6 °C (on 6 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
SōkaSaitama
- coords
- 35.84°, 139.80°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.3°C
Average daily high
19.1°C
Average daily low
12.0°C
Annual rainfall
1,376mm
Sunshine / day
8.2h
Mean relative humidity
74%
Average peak wind
19.9km/h
Seasonal range
22.8°C
Frost days (< 0 °C)
34 d/yr
Hot days (≥ 30 °C)
36 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
17.1 cm
Average feels-like high
18.5 °C
Average feels-like low
10.9 °C
Average peak gust
32.4 km/h
Tropical nights (≥ 20 °C)
87 d/yr
Solar radiation
13.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.2 °C
since 1940
+0.3 °C per decade · r² = 0.62 · 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
39.3 °C
23 July 2018
Coldest day
-13.6 °C
6 February 1952
Wettest day
238 mm
26 September 1958
Windiest day
84.1 km/h
1 October 2018
Strongest gust
148.3 km/h
1 October 2018
Hottest feels-like
45.1 °C
16 August 2007
Coldest feels-like
-18.8 °C
6 February 1952
Snowiest day
30.5 cm
12 March 1969
Sunniest day
13.9 h
9 July 2025
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 | 10.7 °C | +2.1 °C | 37 mm | -14 mm |
| Feb | 10.7 °C | +1.5 °C | 10 mm | -52 mm |
| Mar | 14.9 °C | +2.3 °C | 160 mm | +57 mm |
| Apr | 19.4 °C | +1.6 °C | 140 mm | +28 mm |
| May | 22.4 °C | +0.3 °C | 181 mm | +53 mm |
| Jun | 28.3 °C | +3.4 °C | 121 mm | -40 mm |
| Jul | 32.9 °C | +4.2 °C | 30 mm | -105 mm |
| Aug | 34.5 °C | +4.2 °C | 37 mm | -82 mm |
| Sep | 30.0 °C | +3.5 °C | 139 mm | -38 mm |
| Oct | 21.5 °C | +0.6 °C | 143 mm | -40 mm |
| Nov | 16.5 °C | +0.5 °C | 32 mm | -60 mm |
| Dec | 12.2 °C | +1.1 °C | 56 mm | +4 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 Sōka?
Sōka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.3 °C and it receives 1,376 mm of precipitation per year.
What is the hottest day ever recorded in Sōka?
The hottest day measured in Sōka between 1940 and 2025 was 23 July 2018, reaching 39.3 °C.
What is the coldest day in Sōka?
The coldest day measured in Sōka between 1940 and 2025 was 6 February 1952, at -13.6 °C.
Does it snow in Sōka?
Yes. Sōka gets on average 17.1 cm of snow per year and has around 34 frost days.
Has the climate of Sōka warmed?
Yes: Sōka warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sōka?
The wettest day measured in Sōka between 1940 and 2025 was 26 September 1958, with 238 mm of rain in 24 hours.
What was the windiest day in Sōka?
The windiest day measured in Sōka between 1940 and 2025 was 1 October 2018, with winds reaching 84.1 km/h.
What is the warmest month in Sōka?
The warmest month in Sōka is August (26.9 °C on average); the coldest is January (4.1 °C).
How much does it rain in Sōka?
Sōka receives on average 1,376 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Sōka?
Sōka 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 Sōka?
The heaviest 24-hour snowfall measured in Sōka between 1940 and 2025 was 12 March 1969, with 30.5 cm.
Are there tropical nights in Sōka?
Yes: Sōka has on average 87 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Sōka?
In Sōka, between 1940 and 2025, the highest apparent temperature reached 45.1 °C on 16 August 2007, and the lowest was -18.8 °C on 6 February 1952.
Compare Sōka with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sōka