Asahi climate — normals and trends
Asahi (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 1,501 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 (25.7 °C on average) and the coldest is January (6.9 °C). Rainfall peaks in October.
Asahi averages 1 frost days, 4 hot days (≥ 30 °C) and 146 rainy days per year.
Asahi has warmed by +1.5 °C between 1940 and 2025, or +0.18 °C per decade. This trend is statistically significant.
The number of frost days there went from about 2 to 0 per year over the period.
The hottest day of the period reached 33.7 °C (on 11 August 2024) and the coldest -2.3 °C (on 5 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
AsahiChiba
- coords
- 35.72°, 140.65°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
18.0°C
Average daily low
14.2°C
Annual rainfall
1,501mm
Sunshine / day
8.5h
Mean relative humidity
75%
Average peak wind
26.2km/h
Seasonal range
18.8°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
4 d/yr
Rainy days (≥ 1 mm)
146 d/yr
Annual snowfall
2.7 cm
Average feels-like high
17.4 °C
Average feels-like low
12.1 °C
Average peak gust
42.0 km/h
Tropical nights (≥ 20 °C)
97 d/yr
Solar radiation
14.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.47 · 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
33.7 °C
11 August 2024
Coldest day
-2.3 °C
5 February 1952
Wettest day
176 mm
17 September 1995
Windiest day
89.3 km/h
1 October 2002
Strongest gust
153.7 km/h
19 October 1979
Hottest feels-like
40.2 °C
19 August 2024
Coldest feels-like
-10.8 °C
25 January 2023
Snowiest day
12.3 cm
15 February 1951
Sunniest day
14.0 h
20 June 1962
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 | 10.6 °C | +1.5 °C | 65 mm | -12 mm |
| Feb | 9.9 °C | +0.6 °C | 18 mm | -69 mm |
| Mar | 13.9 °C | +1.9 °C | 157 mm | +30 mm |
| Apr | 17.2 °C | +1.1 °C | 125 mm | +5 mm |
| May | 20.1 °C | +0.4 °C | 199 mm | +65 mm |
| Jun | 24.8 °C | +2.4 °C | 112 mm | -48 mm |
| Jul | 28.3 °C | +2.6 °C | 68 mm | -54 mm |
| Aug | 29.6 °C | +2.1 °C | 66 mm | -33 mm |
| Sep | 27.7 °C | +2.7 °C | 119 mm | -46 mm |
| Oct | 21.6 °C | +1.0 °C | 173 mm | -35 mm |
| Nov | 16.5 °C | +0.1 °C | 78 mm | -42 mm |
| Dec | 13.1 °C | +1.3 °C | 105 mm | +23 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 Asahi?
Asahi has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 1,501 mm of precipitation per year.
What is the hottest day ever recorded in Asahi?
The hottest day measured in Asahi between 1940 and 2025 was 11 August 2024, reaching 33.7 °C.
What is the coldest day in Asahi?
The coldest day measured in Asahi between 1940 and 2025 was 5 February 1952, at -2.3 °C.
Does it snow in Asahi?
Yes. Asahi gets on average 2.7 cm of snow per year and has around 1 frost days.
Has the climate of Asahi warmed?
Yes: Asahi warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Asahi?
The wettest day measured in Asahi between 1940 and 2025 was 17 September 1995, with 176 mm of rain in 24 hours.
What was the windiest day in Asahi?
The windiest day measured in Asahi between 1940 and 2025 was 1 October 2002, with winds reaching 89.3 km/h.
What is the warmest month in Asahi?
The warmest month in Asahi is August (25.7 °C on average); the coldest is January (6.9 °C).
How much does it rain in Asahi?
Asahi receives on average 1,501 mm of precipitation per year, spread over about 146 rainy days.
Is it sunny in Asahi?
Asahi gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.
What is the biggest single-day snowfall in Asahi?
The heaviest 24-hour snowfall measured in Asahi between 1940 and 2025 was 15 February 1951, with 12.3 cm.
Are there tropical nights in Asahi?
Yes: Asahi has on average 97 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Asahi?
In Asahi, between 1940 and 2025, the highest apparent temperature reached 40.2 °C on 19 August 2024, and the lowest was -10.8 °C on 25 January 2023.
Compare Asahi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Asahi