Honmachi climate — normals and trends
Honmachi (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.9 °C and it receives 1,926 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 (27.5 °C on average) and the coldest is January (6.3 °C). Rainfall peaks in June.
Honmachi averages 3 frost days, 38 hot days (≥ 30 °C) and 155 rainy days per year.
Honmachi has warmed by +2.4 °C between 1940 and 2025, or +0.28 °C per decade. This trend is statistically significant.
The number of frost days there went from about 5 to 1 per year over the period.
The hottest day of the period reached 36.4 °C (on 4 August 2024) and the coldest -3.5 °C (on 19 February 1977).
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
HonmachiKumamoto
- coords
- 32.50°, 130.60°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.9°C
Average daily high
19.8°C
Average daily low
14.3°C
Annual rainfall
1,926mm
Sunshine / day
8.1h
Mean relative humidity
76%
Average peak wind
13.2km/h
Seasonal range
21.2°C
Frost days (< 0 °C)
3 d/yr
Hot days (≥ 30 °C)
38 d/yr
Rainy days (≥ 1 mm)
155 d/yr
Annual snowfall
4.6 cm
Average feels-like high
20.5 °C
Average feels-like low
14.3 °C
Average peak gust
30.3 km/h
Tropical nights (≥ 20 °C)
109 d/yr
Solar radiation
14.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.4 °C
since 1940
+0.3 °C per decade · r² = 0.74 · 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
36.4 °C
4 August 2024
Coldest day
-3.5 °C
19 February 1977
Wettest day
188 mm
3 July 2019
Windiest day
73.3 km/h
27 September 1991
Strongest gust
174.2 km/h
27 September 1991
Hottest feels-like
43.1 °C
5 August 2024
Coldest feels-like
-9.5 °C
26 February 1981
Snowiest day
12.3 cm
18 January 1984
Sunniest day
13.8 h
12 June 1951
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 | 9.3 °C | +0.3 °C | 35 mm | -35 mm |
| Feb | 8.5 °C | -1.7 °C | 58 mm | -32 mm |
| Mar | 15.0 °C | +1.1 °C | 141 mm | +14 mm |
| Apr | 19.5 °C | +0.6 °C | 100 mm | -54 mm |
| May | 22.9 °C | +0.1 °C | 276 mm | +85 mm |
| Jun | 27.3 °C | +1.8 °C | 355 mm | -26 mm |
| Jul | 32.4 °C | +3.3 °C | 85 mm | -226 mm |
| Aug | 31.6 °C | +1.2 °C | 253 mm | +78 mm |
| Sep | 30.0 °C | +2.6 °C | 151 mm | -24 mm |
| Oct | 25.7 °C | +3.3 °C | 93 mm | -7 mm |
| Nov | 17.7 °C | +0.7 °C | 39 mm | -46 mm |
| Dec | 13.3 °C | +1.9 °C | 52 mm | -19 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 Honmachi?
Honmachi has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.9 °C and it receives 1,926 mm of precipitation per year.
What is the hottest day ever recorded in Honmachi?
The hottest day measured in Honmachi between 1940 and 2025 was 4 August 2024, reaching 36.4 °C.
What is the coldest day in Honmachi?
The coldest day measured in Honmachi between 1940 and 2025 was 19 February 1977, at -3.5 °C.
Does it snow in Honmachi?
Yes. Honmachi gets on average 4.6 cm of snow per year and has around 3 frost days.
Has the climate of Honmachi warmed?
Yes: Honmachi warmed by +2.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Honmachi?
The wettest day measured in Honmachi between 1940 and 2025 was 3 July 2019, with 188 mm of rain in 24 hours.
What was the windiest day in Honmachi?
The windiest day measured in Honmachi between 1940 and 2025 was 27 September 1991, with winds reaching 73.3 km/h.
What is the warmest month in Honmachi?
The warmest month in Honmachi is August (27.5 °C on average); the coldest is January (6.3 °C).
How much does it rain in Honmachi?
Honmachi receives on average 1,926 mm of precipitation per year, spread over about 155 rainy days.
Is it sunny in Honmachi?
Honmachi 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 Honmachi?
The heaviest 24-hour snowfall measured in Honmachi between 1940 and 2025 was 18 January 1984, with 12.3 cm.
Are there tropical nights in Honmachi?
Yes: Honmachi has on average 109 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Honmachi?
In Honmachi, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 5 August 2024, and the lowest was -9.5 °C on 26 February 1981.
Compare Honmachi with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Honmachi