Niigata climate — normals and trends
Niigata (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.0 °C and it receives 1,810 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 (26.1 °C on average) and the coldest is February (3.8 °C). Rainfall peaks in July.
Niigata averages 8 frost days, 7 hot days (≥ 30 °C) and 213 rainy days per year.
Niigata has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.
The number of frost days there went from about 16 to 0 per year over the period.
The hottest day of the period reached 35.0 °C (on 15 August 2023) and the coldest -4.3 °C (on 9 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
NiigataNiigata
- coords
- 37.92°, 139.04°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.0°C
Average daily high
16.0°C
Average daily low
12.1°C
Annual rainfall
1,810mm
Sunshine / day
8.5h
Mean relative humidity
76%
Average peak wind
24.5km/h
Seasonal range
22.3°C
Frost days (< 0 °C)
8 d/yr
Hot days (≥ 30 °C)
7 d/yr
Rainy days (≥ 1 mm)
213 d/yr
Annual snowfall
95.0 cm
Average feels-like high
15.1 °C
Average feels-like low
9.8 °C
Average peak gust
39.0 km/h
Tropical nights (≥ 20 °C)
83 d/yr
Solar radiation
13.9 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.7 °C
since 1940
+0.2 °C per decade · r² = 0.53 · 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
35.0 °C
15 August 2023
Coldest day
-4.3 °C
9 February 1942
Wettest day
136 mm
26 July 1983
Windiest day
89.6 km/h
28 September 1991
Strongest gust
142.2 km/h
18 September 1945
Hottest feels-like
42.4 °C
23 August 2023
Coldest feels-like
-13.4 °C
25 January 2023
Snowiest day
17.4 cm
24 January 2016
Sunniest day
14.1 h
13 June 1940
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 | 6.7 °C | +1.2 °C | 238 mm | +60 mm |
| Feb | 5.6 °C | +0.1 °C | 129 mm | +8 mm |
| Mar | 10.0 °C | +1.8 °C | 92 mm | -17 mm |
| Apr | 13.6 °C | +0.5 °C | 109 mm | +13 mm |
| May | 18.1 °C | +0.4 °C | 157 mm | +54 mm |
| Jun | 23.5 °C | +1.8 °C | 98 mm | -30 mm |
| Jul | 29.5 °C | +3.7 °C | 11 mm | -206 mm |
| Aug | 29.5 °C | +1.5 °C | 309 mm | +152 mm |
| Sep | 27.2 °C | +2.6 °C | 288 mm | +115 mm |
| Oct | 20.2 °C | +1.0 °C | 225 mm | +72 mm |
| Nov | 14.5 °C | +0.7 °C | 191 mm | +24 mm |
| Dec | 10.3 °C | +1.7 °C | 214 mm | +6 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 Niigata?
Niigata has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,810 mm of precipitation per year.
What is the hottest day ever recorded in Niigata?
The hottest day measured in Niigata between 1940 and 2025 was 15 August 2023, reaching 35.0 °C.
What is the coldest day in Niigata?
The coldest day measured in Niigata between 1940 and 2025 was 9 February 1942, at -4.3 °C.
Does it snow in Niigata?
Yes. Niigata gets on average 95.0 cm of snow per year and has around 8 frost days.
Has the climate of Niigata warmed?
Yes: Niigata warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Niigata?
The wettest day measured in Niigata between 1940 and 2025 was 26 July 1983, with 136 mm of rain in 24 hours.
What was the windiest day in Niigata?
The windiest day measured in Niigata between 1940 and 2025 was 28 September 1991, with winds reaching 89.6 km/h.
What is the warmest month in Niigata?
The warmest month in Niigata is August (26.1 °C on average); the coldest is February (3.8 °C).
How much does it rain in Niigata?
Niigata receives on average 1,810 mm of precipitation per year, spread over about 213 rainy days.
Is it sunny in Niigata?
Niigata 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 Niigata?
The heaviest 24-hour snowfall measured in Niigata between 1940 and 2025 was 24 January 2016, with 17.4 cm.
Are there tropical nights in Niigata?
Yes: Niigata has on average 83 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Niigata?
In Niigata, between 1940 and 2025, the highest apparent temperature reached 42.4 °C on 23 August 2023, and the lowest was -13.4 °C on 25 January 2023.
Compare Niigata with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Niigata