Ikegami climate — normals and trends
Ikegami (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.8 °C and it receives 1,408 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 (5.8 °C). Rainfall peaks in October.
Ikegami averages 5 frost days, 11 hot days (≥ 30 °C) and 134 rainy days per year.
Ikegami has warmed by +1.8 °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 11 to 0 per year over the period.
The hottest day of the period reached 34.8 °C (on 23 July 2018) and the coldest -6.7 °C (on 8 February 1984).
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
IkegamiTokyo
- coords
- 35.58°, 139.71°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.8°C
Average daily high
18.3°C
Average daily low
13.4°C
Annual rainfall
1,408mm
Sunshine / day
8.1h
Mean relative humidity
75%
Average peak wind
25.0km/h
Seasonal range
20.6°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
11 d/yr
Rainy days (≥ 1 mm)
134 d/yr
Annual snowfall
13.3 cm
Average feels-like high
17.7 °C
Average feels-like low
11.6 °C
Average peak gust
38.3 km/h
Tropical nights (≥ 20 °C)
96 d/yr
Solar radiation
13.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.59 · 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
34.8 °C
23 July 2018
Coldest day
-6.7 °C
8 February 1984
Wettest day
208 mm
26 September 1958
Windiest day
93.2 km/h
1 October 2018
Strongest gust
158.0 km/h
1 October 2018
Hottest feels-like
41.9 °C
22 July 2024
Coldest feels-like
-12.4 °C
8 February 1984
Snowiest day
33.2 cm
8 February 2014
Sunniest day
13.9 h
8 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 | 10.5 °C | +1.6 °C | 40 mm | -17 mm |
| Feb | 10.1 °C | +0.9 °C | 14 mm | -56 mm |
| Mar | 13.9 °C | +1.7 °C | 163 mm | +48 mm |
| Apr | 17.9 °C | +1.2 °C | 121 mm | +5 mm |
| May | 21.2 °C | +0.7 °C | 187 mm | +54 mm |
| Jun | 26.3 °C | +2.9 °C | 114 mm | -52 mm |
| Jul | 30.0 °C | +3.1 °C | 35 mm | -93 mm |
| Aug | 31.5 °C | +2.9 °C | 41 mm | -72 mm |
| Sep | 28.6 °C | +3.0 °C | 126 mm | -44 mm |
| Oct | 21.2 °C | +0.6 °C | 152 mm | -35 mm |
| Nov | 16.2 °C | +0.2 °C | 35 mm | -63 mm |
| Dec | 12.5 °C | +1.1 °C | 68 mm | +11 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 Ikegami?
Ikegami has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.8 °C and it receives 1,408 mm of precipitation per year.
What is the hottest day ever recorded in Ikegami?
The hottest day measured in Ikegami between 1940 and 2025 was 23 July 2018, reaching 34.8 °C.
What is the coldest day in Ikegami?
The coldest day measured in Ikegami between 1940 and 2025 was 8 February 1984, at -6.7 °C.
Does it snow in Ikegami?
Yes. Ikegami gets on average 13.3 cm of snow per year and has around 5 frost days.
Has the climate of Ikegami warmed?
Yes: Ikegami warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ikegami?
The wettest day measured in Ikegami between 1940 and 2025 was 26 September 1958, with 208 mm of rain in 24 hours.
What was the windiest day in Ikegami?
The windiest day measured in Ikegami between 1940 and 2025 was 1 October 2018, with winds reaching 93.2 km/h.
What is the warmest month in Ikegami?
The warmest month in Ikegami is August (26.4 °C on average); the coldest is January (5.8 °C).
How much does it rain in Ikegami?
Ikegami receives on average 1,408 mm of precipitation per year, spread over about 134 rainy days.
Is it sunny in Ikegami?
Ikegami gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ikegami?
The heaviest 24-hour snowfall measured in Ikegami between 1940 and 2025 was 8 February 2014, with 33.2 cm.
Are there tropical nights in Ikegami?
Yes: Ikegami has on average 96 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ikegami?
In Ikegami, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 22 July 2024, and the lowest was -12.4 °C on 8 February 1984.
Compare Ikegami with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ikegami