Ishiki climate — normals and trends
Ishiki (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.4 °C and it receives 1,639 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 (26.8 °C on average) and the coldest is January (6.9 °C). Rainfall peaks in June.
Ishiki averages 0 frost days, 6 hot days (≥ 30 °C) and 133 rainy days per year.
Ishiki has warmed by +1.6 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.8 °C (on 4 August 1994) and the coldest -1.0 °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
IshikiAichi
- coords
- 34.80°, 137.02°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.4°C
Average daily high
18.5°C
Average daily low
14.5°C
Annual rainfall
1,639mm
Sunshine / day
8.8h
Mean relative humidity
74%
Average peak wind
30.3km/h
Seasonal range
19.9°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
133 d/yr
Annual snowfall
2.3 cm
Average feels-like high
17.6 °C
Average feels-like low
12.0 °C
Average peak gust
44.5 km/h
Tropical nights (≥ 20 °C)
109 d/yr
Solar radiation
15.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.6 °C
since 1940
+0.2 °C per decade · r² = 0.53 · 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
33.8 °C
4 August 1994
Coldest day
-1.0 °C
14 February 1942
Wettest day
201 mm
12 October 2019
Windiest day
141.9 km/h
26 September 1959
Strongest gust
227.5 km/h
26 September 1959
Hottest feels-like
40.5 °C
5 August 1994
Coldest feels-like
-10.8 °C
22 January 1997
Snowiest day
10.6 cm
12 February 1994
Sunniest day
14.0 h
10 June 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 | 9.6 °C | +0.4 °C | 35 mm | -30 mm |
| Feb | 8.7 °C | -0.9 °C | 30 mm | -45 mm |
| Mar | 12.8 °C | +0.4 °C | 88 mm | -24 mm |
| Apr | 17.2 °C | +0.8 °C | 122 mm | -11 mm |
| May | 20.5 °C | +0.5 °C | 229 mm | +69 mm |
| Jun | 25.2 °C | +1.9 °C | 196 mm | -23 mm |
| Jul | 29.2 °C | +2.4 °C | 114 mm | -71 mm |
| Aug | 30.7 °C | +2.4 °C | 77 mm | -63 mm |
| Sep | 27.8 °C | +1.9 °C | 207 mm | -1 mm |
| Oct | 22.5 °C | +1.3 °C | 217 mm | +37 mm |
| Nov | 16.8 °C | +0.2 °C | 27 mm | -70 mm |
| Dec | 12.5 °C | +0.8 °C | 101 mm | +37 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 Ishiki?
Ishiki has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.4 °C and it receives 1,639 mm of precipitation per year.
What is the hottest day ever recorded in Ishiki?
The hottest day measured in Ishiki between 1940 and 2025 was 4 August 1994, reaching 33.8 °C.
What is the coldest day in Ishiki?
The coldest day measured in Ishiki between 1940 and 2025 was 14 February 1942, at -1.0 °C.
Does it snow in Ishiki?
Yes. Ishiki gets on average 2.3 cm of snow per year and has around 0 frost days.
Has the climate of Ishiki warmed?
Yes: Ishiki warmed by +1.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ishiki?
The wettest day measured in Ishiki between 1940 and 2025 was 12 October 2019, with 201 mm of rain in 24 hours.
What was the windiest day in Ishiki?
The windiest day measured in Ishiki between 1940 and 2025 was 26 September 1959, with winds reaching 141.9 km/h.
What is the warmest month in Ishiki?
The warmest month in Ishiki is August (26.8 °C on average); the coldest is January (6.9 °C).
How much does it rain in Ishiki?
Ishiki receives on average 1,639 mm of precipitation per year, spread over about 133 rainy days.
Is it sunny in Ishiki?
Ishiki gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ishiki?
The heaviest 24-hour snowfall measured in Ishiki between 1940 and 2025 was 12 February 1994, with 10.6 cm.
Are there tropical nights in Ishiki?
Yes: Ishiki has on average 109 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ishiki?
In Ishiki, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 5 August 1994, and the lowest was -10.8 °C on 22 January 1997.
Compare Ishiki with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ishiki