Ichinoseki climate — normals and trends
Ichinoseki (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.8 °C and it receives 1,177 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 (23.5 °C on average) and the coldest is January (-1.2 °C). Rainfall peaks in September.
Ichinoseki averages 107 frost days, 12 hot days (≥ 30 °C) and 144 rainy days per year.
Ichinoseki has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.
The number of frost days there went from about 130 to 84 per year over the period.
The hottest day of the period reached 35.6 °C (on 5 August 2015) and the coldest -20.9 °C (on 26 January 1945).
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
IchinosekiIwate
- coords
- 38.92°, 141.13°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.8°C
Average daily high
14.9°C
Average daily low
6.9°C
Annual rainfall
1,177mm
Sunshine / day
8.3h
Mean relative humidity
75%
Average peak wind
15.7km/h
Seasonal range
24.7°C
Frost days (< 0 °C)
107 d/yr
Hot days (≥ 30 °C)
12 d/yr
Rainy days (≥ 1 mm)
144 d/yr
Annual snowfall
75.3 cm
Average feels-like high
13.5 °C
Average feels-like low
5.1 °C
Average peak gust
40.8 km/h
Tropical nights (≥ 20 °C)
35 d/yr
Solar radiation
13.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.9 °C
since 1940
+0.3 °C per decade · r² = 0.66 · 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
35.6 °C
5 August 2015
Coldest day
-20.9 °C
26 January 1945
Wettest day
143 mm
15 September 1947
Windiest day
48.1 km/h
31 March 1979
Strongest gust
132.1 km/h
23 August 1981
Hottest feels-like
41.6 °C
4 August 2021
Coldest feels-like
-26.1 °C
26 January 1945
Snowiest day
36.3 cm
18 January 2016
Sunniest day
14.7 h
13 June 1986
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 | 4.6 °C | +1.9 °C | 39 mm | -10 mm |
| Feb | 4.4 °C | +0.9 °C | 27 mm | -25 mm |
| Mar | 9.7 °C | +2.2 °C | 77 mm | -6 mm |
| Apr | 14.9 °C | +0.9 °C | 105 mm | +11 mm |
| May | 19.3 °C | +0.4 °C | 145 mm | +45 mm |
| Jun | 26.3 °C | +4.4 °C | 83 mm | -34 mm |
| Jul | 30.5 °C | +4.9 °C | 98 mm | -54 mm |
| Aug | 30.1 °C | +2.8 °C | 137 mm | -0 mm |
| Sep | 25.9 °C | +2.7 °C | 150 mm | -5 mm |
| Oct | 18.1 °C | +0.5 °C | 122 mm | +11 mm |
| Nov | 12.2 °C | +0.8 °C | 74 mm | +5 mm |
| Dec | 6.6 °C | +1.2 °C | 70 mm | +13 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 Ichinoseki?
Ichinoseki has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.8 °C and it receives 1,177 mm of precipitation per year.
What is the hottest day ever recorded in Ichinoseki?
The hottest day measured in Ichinoseki between 1940 and 2025 was 5 August 2015, reaching 35.6 °C.
What is the coldest day in Ichinoseki?
The coldest day measured in Ichinoseki between 1940 and 2025 was 26 January 1945, at -20.9 °C.
Does it snow in Ichinoseki?
Yes. Ichinoseki gets on average 75.3 cm of snow per year and has around 107 frost days.
Has the climate of Ichinoseki warmed?
Yes: Ichinoseki warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ichinoseki?
The wettest day measured in Ichinoseki between 1940 and 2025 was 15 September 1947, with 143 mm of rain in 24 hours.
What was the windiest day in Ichinoseki?
The windiest day measured in Ichinoseki between 1940 and 2025 was 31 March 1979, with winds reaching 48.1 km/h.
What is the warmest month in Ichinoseki?
The warmest month in Ichinoseki is August (23.5 °C on average); the coldest is January (-1.2 °C).
How much does it rain in Ichinoseki?
Ichinoseki receives on average 1,177 mm of precipitation per year, spread over about 144 rainy days.
Is it sunny in Ichinoseki?
Ichinoseki 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 Ichinoseki?
The heaviest 24-hour snowfall measured in Ichinoseki between 1940 and 2025 was 18 January 2016, with 36.3 cm.
Are there tropical nights in Ichinoseki?
Yes: Ichinoseki has on average 35 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ichinoseki?
In Ichinoseki, between 1940 and 2025, the highest apparent temperature reached 41.6 °C on 4 August 2021, and the lowest was -26.1 °C on 26 January 1945.
Compare Ichinoseki with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ichinoseki