Shiozawa climate — normals and trends
Shiozawa (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 9.1 °C and it receives 2,371 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 (22.4 °C on average) and the coldest is January (-3.4 °C). Rainfall peaks in July.
Shiozawa averages 134 frost days, 5 hot days (≥ 30 °C) and 242 rainy days per year.
Shiozawa has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.
The number of frost days there went from about 152 to 116 per year over the period.
The hottest day of the period reached 33.6 °C (on 13 July 2015) and the coldest -19.2 °C (on 7 February 2020).
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
ShiozawaNiigata
- coords
- 37.04°, 138.85°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.1°C
Average daily high
13.4°C
Average daily low
5.2°C
Annual rainfall
2,371mm
Sunshine / day
8.4h
Mean relative humidity
82%
Average peak wind
10.1km/h
Seasonal range
25.8°C
Frost days (< 0 °C)
134 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
242 d/yr
Annual snowfall
466.4 cm
Average feels-like high
12.7 °C
Average feels-like low
3.5 °C
Average peak gust
38.0 km/h
Tropical nights (≥ 20 °C)
16 d/yr
Solar radiation
14.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.6 °C
since 1940
+0.3 °C per decade · r² = 0.65 · 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
33.6 °C
13 July 2015
Coldest day
-19.2 °C
7 February 2020
Wettest day
147 mm
12 October 2019
Windiest day
40.8 km/h
16 September 1961
Strongest gust
195.1 km/h
27 September 1959
Hottest feels-like
39.1 °C
26 July 2014
Coldest feels-like
-24.1 °C
7 February 2020
Snowiest day
54.3 cm
15 February 2014
Sunniest day
14.0 h
15 June 2004
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 | 0.6 °C | +0.5 °C | 177 mm | -30 mm |
| Feb | -0.2 °C | -1.1 °C | 229 mm | +53 mm |
| Mar | 6.2 °C | +1.5 °C | 173 mm | +5 mm |
| Apr | 13.6 °C | +2.2 °C | 148 mm | +14 mm |
| May | 18.1 °C | -0.1 °C | 161 mm | +1 mm |
| Jun | 23.9 °C | +2.2 °C | 227 mm | +4 mm |
| Jul | 28.7 °C | +3.3 °C | 100 mm | -191 mm |
| Aug | 28.0 °C | +1.4 °C | 335 mm | +106 mm |
| Sep | 24.5 °C | +2.3 °C | 266 mm | +34 mm |
| Oct | 16.8 °C | +0.7 °C | 235 mm | +49 mm |
| Nov | 10.2 °C | +0.4 °C | 176 mm | +12 mm |
| Dec | 4.1 °C | +1.0 °C | 243 mm | +45 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 Shiozawa?
Shiozawa has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 9.1 °C and it receives 2,371 mm of precipitation per year.
What is the hottest day ever recorded in Shiozawa?
The hottest day measured in Shiozawa between 1940 and 2025 was 13 July 2015, reaching 33.6 °C.
What is the coldest day in Shiozawa?
The coldest day measured in Shiozawa between 1940 and 2025 was 7 February 2020, at -19.2 °C.
Does it snow in Shiozawa?
Yes. Shiozawa gets on average 466.4 cm of snow per year and has around 134 frost days.
Has the climate of Shiozawa warmed?
Yes: Shiozawa warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Shiozawa?
The wettest day measured in Shiozawa between 1940 and 2025 was 12 October 2019, with 147 mm of rain in 24 hours.
What was the windiest day in Shiozawa?
The windiest day measured in Shiozawa between 1940 and 2025 was 16 September 1961, with winds reaching 40.8 km/h.
What is the warmest month in Shiozawa?
The warmest month in Shiozawa is August (22.4 °C on average); the coldest is January (-3.4 °C).
How much does it rain in Shiozawa?
Shiozawa receives on average 2,371 mm of precipitation per year, spread over about 242 rainy days.
Is it sunny in Shiozawa?
Shiozawa gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Shiozawa?
The heaviest 24-hour snowfall measured in Shiozawa between 1940 and 2025 was 15 February 2014, with 54.3 cm.
Are there tropical nights in Shiozawa?
Yes: Shiozawa has on average 16 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Shiozawa?
In Shiozawa, between 1940 and 2025, the highest apparent temperature reached 39.1 °C on 26 July 2014, and the lowest was -24.1 °C on 7 February 2020.
Compare Shiozawa with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Shiozawa