Tomiya climate — normals and trends
Tomiya (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.8 °C and it receives 1,284 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 (24.2 °C on average) and the coldest is January (0.3 °C). Rainfall peaks in July.
Tomiya averages 83 frost days, 10 hot days (≥ 30 °C) and 145 rainy days per year.
Tomiya has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.
The number of frost days there went from about 108 to 58 per year over the period.
The hottest day of the period reached 35.2 °C (on 15 August 1994) and the coldest -17.3 °C (on 12 February 1942).
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
TomiyaMiyagi
- coords
- 38.39°, 140.89°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
11.8°C
Average daily high
15.5°C
Average daily low
8.3°C
Annual rainfall
1,284mm
Sunshine / day
8.3h
Mean relative humidity
76%
Average peak wind
17.5km/h
Seasonal range
23.9°C
Frost days (< 0 °C)
83 d/yr
Hot days (≥ 30 °C)
10 d/yr
Rainy days (≥ 1 mm)
145 d/yr
Annual snowfall
58.9 cm
Average feels-like high
14.4 °C
Average feels-like low
6.7 °C
Average peak gust
36.7 km/h
Tropical nights (≥ 20 °C)
47 d/yr
Solar radiation
13.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.7 °C
since 1940
+0.3 °C per decade · r² = 0.63 · 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
35.2 °C
15 August 1994
Coldest day
-17.3 °C
12 February 1942
Wettest day
152 mm
21 September 2011
Windiest day
55.5 km/h
22 April 1947
Strongest gust
130.0 km/h
27 September 1959
Hottest feels-like
43.3 °C
29 August 2020
Coldest feels-like
-22.5 °C
17 January 1942
Snowiest day
34.9 cm
18 January 2016
Sunniest day
14.4 h
19 June 2007
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 | 5.9 °C | +1.9 °C | 44 mm | -7 mm |
| Feb | 5.5 °C | +0.8 °C | 26 mm | -28 mm |
| Mar | 11.0 °C | +2.6 °C | 76 mm | -8 mm |
| Apr | 15.3 °C | +1.1 °C | 107 mm | +13 mm |
| May | 19.5 °C | +0.7 °C | 183 mm | +78 mm |
| Jun | 26.3 °C | +4.6 °C | 80 mm | -54 mm |
| Jul | 30.4 °C | +5.0 °C | 91 mm | -86 mm |
| Aug | 30.4 °C | +3.1 °C | 239 mm | +78 mm |
| Sep | 26.5 °C | +2.8 °C | 144 mm | -30 mm |
| Oct | 19.0 °C | +0.7 °C | 145 mm | +20 mm |
| Nov | 13.6 °C | +1.1 °C | 61 mm | -8 mm |
| Dec | 8.4 °C | +1.6 °C | 70 mm | +12 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 Tomiya?
Tomiya has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 11.8 °C and it receives 1,284 mm of precipitation per year.
What is the hottest day ever recorded in Tomiya?
The hottest day measured in Tomiya between 1940 and 2025 was 15 August 1994, reaching 35.2 °C.
What is the coldest day in Tomiya?
The coldest day measured in Tomiya between 1940 and 2025 was 12 February 1942, at -17.3 °C.
Does it snow in Tomiya?
Yes. Tomiya gets on average 58.9 cm of snow per year and has around 83 frost days.
Has the climate of Tomiya warmed?
Yes: Tomiya warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Tomiya?
The wettest day measured in Tomiya between 1940 and 2025 was 21 September 2011, with 152 mm of rain in 24 hours.
What was the windiest day in Tomiya?
The windiest day measured in Tomiya between 1940 and 2025 was 22 April 1947, with winds reaching 55.5 km/h.
What is the warmest month in Tomiya?
The warmest month in Tomiya is August (24.2 °C on average); the coldest is January (0.3 °C).
How much does it rain in Tomiya?
Tomiya receives on average 1,284 mm of precipitation per year, spread over about 145 rainy days.
Is it sunny in Tomiya?
Tomiya 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 Tomiya?
The heaviest 24-hour snowfall measured in Tomiya between 1940 and 2025 was 18 January 2016, with 34.9 cm.
Are there tropical nights in Tomiya?
Yes: Tomiya has on average 47 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Tomiya?
In Tomiya, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 29 August 2020, and the lowest was -22.5 °C on 17 January 1942.
Compare Tomiya with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Tomiya