Hayama climate — normals and trends
Hayama (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.1 °C and it receives 1,771 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 (25.6 °C on average) and the coldest is February (7.4 °C). Rainfall peaks in October.
Hayama averages 0 frost days, 0 hot days (≥ 30 °C) and 153 rainy days per year.
Hayama has warmed by +1.2 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.7 °C (on 16 August 2020) and the coldest -0.6 °C (on 4 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
HayamaKanagawa
- coords
- 35.28°, 139.58°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.1°C
Average daily high
17.6°C
Average daily low
14.6°C
Annual rainfall
1,771mm
Sunshine / day
8.3h
Mean relative humidity
76%
Average peak wind
27.5km/h
Seasonal range
18.2°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
153 d/yr
Annual snowfall
7.9 cm
Average feels-like high
17.2 °C
Average feels-like low
12.5 °C
Average peak gust
39.9 km/h
Tropical nights (≥ 20 °C)
103 d/yr
Solar radiation
13.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.2 °C per decade · r² = 0.42 · 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
30.7 °C
16 August 2020
Coldest day
-0.6 °C
4 February 1984
Wettest day
214 mm
26 September 1958
Windiest day
96.3 km/h
25 September 1966
Strongest gust
162.4 km/h
1 October 2018
Hottest feels-like
38.6 °C
16 August 2020
Coldest feels-like
-9.3 °C
15 February 1951
Snowiest day
28.1 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 | 10.8 °C | +1.3 °C | 56 mm | -19 mm |
| Feb | 10.2 °C | +0.7 °C | 26 mm | -69 mm |
| Mar | 13.2 °C | +1.2 °C | 205 mm | +52 mm |
| Apr | 16.1 °C | +0.5 °C | 134 mm | -19 mm |
| May | 19.3 °C | +0.6 °C | 230 mm | +63 mm |
| Jun | 23.8 °C | +2.3 °C | 130 mm | -74 mm |
| Jul | 27.2 °C | +2.6 °C | 48 mm | -106 mm |
| Aug | 28.2 °C | +1.7 °C | 35 mm | -101 mm |
| Sep | 26.5 °C | +2.0 °C | 113 mm | -90 mm |
| Oct | 21.1 °C | +0.7 °C | 210 mm | -15 mm |
| Nov | 16.6 °C | +0.2 °C | 46 mm | -85 mm |
| Dec | 13.5 °C | +1.3 °C | 85 mm | +9 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 Hayama?
Hayama has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.1 °C and it receives 1,771 mm of precipitation per year.
What is the hottest day ever recorded in Hayama?
The hottest day measured in Hayama between 1940 and 2025 was 16 August 2020, reaching 30.7 °C.
What is the coldest day in Hayama?
The coldest day measured in Hayama between 1940 and 2025 was 4 February 1984, at -0.6 °C.
Does it snow in Hayama?
Yes. Hayama gets on average 7.9 cm of snow per year and has around 0 frost days.
Has the climate of Hayama warmed?
Yes: Hayama warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Hayama?
The wettest day measured in Hayama between 1940 and 2025 was 26 September 1958, with 214 mm of rain in 24 hours.
What was the windiest day in Hayama?
The windiest day measured in Hayama between 1940 and 2025 was 25 September 1966, with winds reaching 96.3 km/h.
What is the warmest month in Hayama?
The warmest month in Hayama is August (25.6 °C on average); the coldest is February (7.4 °C).
How much does it rain in Hayama?
Hayama receives on average 1,771 mm of precipitation per year, spread over about 153 rainy days.
Is it sunny in Hayama?
Hayama 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 Hayama?
The heaviest 24-hour snowfall measured in Hayama between 1940 and 2025 was 8 February 2014, with 28.1 cm.
Are there tropical nights in Hayama?
Yes: Hayama has on average 103 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Hayama?
In Hayama, between 1940 and 2025, the highest apparent temperature reached 38.6 °C on 16 August 2020, and the lowest was -9.3 °C on 15 February 1951.
Compare Hayama with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Hayama