Kasai climate — normals and trends
Kasai (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.4 °C and it receives 1,588 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 (26.3 °C on average) and the coldest is January (3.3 °C). Rainfall peaks in July.
Kasai averages 53 frost days, 35 hot days (≥ 30 °C) and 130 rainy days per year.
Kasai has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 77 to 29 per year over the period.
The hottest day of the period reached 38.6 °C (on 4 August 1994) and the coldest -10.4 °C (on 19 February 2012).
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
KasaiHyōgo
- coords
- 34.93°, 134.85°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.4°C
Average daily high
18.8°C
Average daily low
10.5°C
Annual rainfall
1,588mm
Sunshine / day
9.0h
Mean relative humidity
74%
Average peak wind
14.8km/h
Seasonal range
23.0°C
Frost days (< 0 °C)
53 d/yr
Hot days (≥ 30 °C)
35 d/yr
Rainy days (≥ 1 mm)
130 d/yr
Annual snowfall
10.8 cm
Average feels-like high
18.3 °C
Average feels-like low
9.5 °C
Average peak gust
37.8 km/h
Tropical nights (≥ 20 °C)
74 d/yr
Solar radiation
14.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.70 · 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
38.6 °C
4 August 1994
Coldest day
-10.4 °C
19 February 2012
Wettest day
233 mm
27 October 1961
Windiest day
63.7 km/h
27 September 1991
Strongest gust
166.3 km/h
30 August 2004
Hottest feels-like
43.9 °C
23 July 2018
Coldest feels-like
-14.6 °C
21 February 1968
Snowiest day
29.0 cm
15 February 1968
Sunniest day
14.0 h
21 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 | 8.3 °C | +0.8 °C | 19 mm | -25 mm |
| Feb | 6.9 °C | -1.3 °C | 28 mm | -34 mm |
| Mar | 12.9 °C | +0.9 °C | 117 mm | +11 mm |
| Apr | 19.0 °C | +1.3 °C | 67 mm | -68 mm |
| May | 22.4 °C | +0.4 °C | 174 mm | +23 mm |
| Jun | 27.6 °C | +2.4 °C | 195 mm | -15 mm |
| Jul | 32.6 °C | +3.7 °C | 100 mm | -139 mm |
| Aug | 32.6 °C | +2.2 °C | 163 mm | -6 mm |
| Sep | 29.2 °C | +2.7 °C | 208 mm | -11 mm |
| Oct | 22.6 °C | +1.6 °C | 211 mm | +81 mm |
| Nov | 16.2 °C | +0.7 °C | 30 mm | -47 mm |
| Dec | 11.2 °C | +1.1 °C | 28 mm | -18 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 Kasai?
Kasai has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.4 °C and it receives 1,588 mm of precipitation per year.
What is the hottest day ever recorded in Kasai?
The hottest day measured in Kasai between 1940 and 2025 was 4 August 1994, reaching 38.6 °C.
What is the coldest day in Kasai?
The coldest day measured in Kasai between 1940 and 2025 was 19 February 2012, at -10.4 °C.
Does it snow in Kasai?
Yes. Kasai gets on average 10.8 cm of snow per year and has around 53 frost days.
Has the climate of Kasai warmed?
Yes: Kasai warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Kasai?
The wettest day measured in Kasai between 1940 and 2025 was 27 October 1961, with 233 mm of rain in 24 hours.
What was the windiest day in Kasai?
The windiest day measured in Kasai between 1940 and 2025 was 27 September 1991, with winds reaching 63.7 km/h.
What is the warmest month in Kasai?
The warmest month in Kasai is August (26.3 °C on average); the coldest is January (3.3 °C).
How much does it rain in Kasai?
Kasai receives on average 1,588 mm of precipitation per year, spread over about 130 rainy days.
Is it sunny in Kasai?
Kasai gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.
What is the biggest single-day snowfall in Kasai?
The heaviest 24-hour snowfall measured in Kasai between 1940 and 2025 was 15 February 1968, with 29.0 cm.
Are there tropical nights in Kasai?
Yes: Kasai has on average 74 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Kasai?
In Kasai, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 23 July 2018, and the lowest was -14.6 °C on 21 February 1968.
Compare Kasai with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Kasai