Uonuma climate — normals and trends

Q: What is the climate of Uonuma?

Uonuma has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 2,465 mm of precipitation per year.

Q: What is the hottest day ever recorded in Uonuma?

The hottest day measured in Uonuma between 1940 and 2025 was 24 August 2023, reaching 35.7 °C.

Q: What is the coldest day in Uonuma?

The coldest day measured in Uonuma between 1940 and 2025 was 22 December 1942, at -14.1 °C.

Q: Does it snow in Uonuma?

Yes. Uonuma gets on average 542.9 cm of snow per year and has around 115 frost days.

Q: Has the climate of Uonuma warmed?

Yes: Uonuma warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Uonuma?

The wettest day measured in Uonuma between 1940 and 2025 was 2 July 1979, with 164 mm of rain in 24 hours.

Q: What was the windiest day in Uonuma?

The windiest day measured in Uonuma between 1940 and 2025 was 19 January 2021, with winds reaching 41.1 km/h.

Q: What is the warmest month in Uonuma?

The warmest month in Uonuma is August (23.7 °C on average); the coldest is January (-1.2 °C).

Q: How much does it rain in Uonuma?

Uonuma receives on average 2,465 mm of precipitation per year, spread over about 236 rainy days.

Q: Is it sunny in Uonuma?

Uonuma gets on average 8.3 hours of sunshine per day, roughly 3,030 hours per year over 1940-2025.

Uonuma (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.6 °C and it receives 2,465 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 (23.7 °C on average) and the coldest is January (-1.2 °C). Rainfall peaks in January.

Uonuma averages 115 frost days, 14 hot days (≥ 30 °C) and 236 rainy days per year.

Uonuma 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 135 to 95 per year over the period.

The hottest day of the period reached 35.7 °C (on 24 August 2023) and the coldest -14.1 °C (on 22 December 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

UonumaNiigata

coords: 37.24°, 138.96°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJanuaryDriest monthApril

Mean daily temperature

10.6°C

Average daily high

14.8°C

Average daily low

6.9°C

Annual rainfall

2,465mm

Sunshine / day

8.3h

Mean relative humidity

80%

Average peak wind

11.2km/h

Seasonal range

24.9°C

Frost days (< 0 °C)

115 d/yr

Hot days (≥ 30 °C)

14 d/yr

Rainy days (≥ 1 mm)

236 d/yr

Annual snowfall

542.9 cm

Average feels-like high

14.3 °C

Average feels-like low

5.2 °C

Average peak gust

36.6 km/h

Tropical nights (≥ 20 °C)

33 d/yr

Solar radiation

13.8 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.7 °C

since 1940

+0.3 °C per decade · r² = 0.66 · p = < 0.001

19402025

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

35.7 °C

24 August 2023

Coldest day

-14.1 °C

22 December 1942

Wettest day

164 mm

2 July 1979

Windiest day

41.1 km/h

19 January 2021

Strongest gust

146.9 km/h

27 September 1959

Hottest feels-like

41.9 °C

6 August 2021

Coldest feels-like

-18.8 °C

11 February 1942

Snowiest day

50.1 cm

15 February 2014

Sunniest day

14.1 h

11 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.3 °C30 July 2025	-9.3 °C23 December 2025	11.8 °C	2,638 mm	39	106
2024	33.5 °C23 August 2024	-10.9 °C11 January 2024	12.6 °C	2,608 mm	25	102
2023	35.7 °C24 August 2023	-12.4 °C28 December 2023	12.8 °C	2,308 mm	53	92
2022	33.3 °C1 August 2022	-7.6 °C6 January 2022	12.1 °C	2,561 mm	33	94
2021	34.5 °C6 August 2021	-9.8 °C21 January 2021	12.1 °C	2,471 mm	17	95
2020	34.5 °C3 September 2020	-13.7 °C7 February 2020	12.2 °C	2,814 mm	22	83
2019	34.2 °C27 July 2019	-11.5 °C16 December 2019	12.0 °C	2,681 mm	26	104
2018	35.3 °C22 August 2018	-10.1 °C13 January 2018	12.1 °C	2,189 mm	36	94
2017	34.9 °C7 August 2017	-10.7 °C7 January 2017	11.0 °C	2,958 mm	11	107
2016	33.6 °C7 August 2016	-13.2 °C17 January 2016	12.1 °C	2,389 mm	16	95
2015	35.2 °C13 July 2015	-11.3 °C31 December 2015	12.0 °C	2,287 mm	21	93
2014	33.3 °C26 July 2014	-10.1 °C15 January 2014	11.0 °C	2,431 mm	13	106
2013	32.7 °C31 August 2013	-9.3 °C12 January 2013	11.2 °C	2,713 mm	11	113
2012	34.2 °C31 August 2012	-12.0 °C25 December 2012	11.1 °C	2,385 mm	42	115
2011	32.6 °C18 July 2011	-10.2 °C21 December 2011	11.0 °C	2,358 mm	25	122
2010	33.6 °C2 September 2010	-11.0 °C27 December 2010	11.7 °C	2,499 mm	37	105
2009	32.8 °C15 July 2009	-9.5 °C29 December 2009	11.5 °C	2,331 mm	7	102
2008	32.2 °C3 August 2008	-9.5 °C22 January 2008	11.5 °C	2,123 mm	13	97
2007	35.6 °C12 August 2007	-11.4 °C25 February 2007	11.7 °C	2,155 mm	22	97
2006	35.5 °C17 August 2006	-9.5 °C7 January 2006	11.5 °C	2,444 mm	15	99
2005	31.9 °C6 August 2005	-11.4 °C12 December 2005	11.1 °C	2,547 mm	16	117
2004	35.0 °C19 August 2004	-10.3 °C31 December 2004	12.1 °C	2,709 mm	25	92
2003	32.8 °C13 September 2003	-8.7 °C3 January 2003	11.2 °C	2,252 mm	5	100
2002	34.5 °C26 July 2002	-7.4 °C21 December 2002	11.3 °C	2,581 mm	23	104
2001	32.1 °C15 July 2001	-7.4 °C14 January 2001	11.2 °C	2,505 mm	9	108
2000	34.3 °C31 July 2000	-10.8 °C27 January 2000	11.4 °C	2,577 mm	16	108
1999	35.4 °C9 August 1999	-7.8 °C4 February 1999	11.6 °C	2,478 mm	27	107
1998	32.1 °C25 July 1998	-9.5 °C4 December 1998	12.0 °C	2,620 mm	7	98
1997	34.2 °C9 August 1997	-11.2 °C25 December 1997	11.1 °C	2,414 mm	9	102
1996	32.2 °C14 August 1996	-9.5 °C7 December 1996	10.2 °C	2,509 mm	11	119
1995	33.1 °C24 July 1995	-8.6 °C3 January 1995	10.6 °C	2,542 mm	15	109
1994	33.8 °C14 August 1994	-7.3 °C11 December 1994	11.7 °C	2,111 mm	26	113
1993	30.4 °C4 September 1993	-7.2 °C7 December 1993	10.5 °C	2,827 mm	2	109
1992	32.1 °C25 August 1992	-10.8 °C28 November 1992	11.1 °C	2,276 mm	18	93
1991	32.6 °C19 August 1991	-10.0 °C26 November 1991	11.5 °C	2,673 mm	10	98
1990	33.3 °C22 August 1990	-8.3 °C21 January 1990	12.2 °C	2,112 mm	24	87
1989	31.2 °C25 July 1989	-5.7 °C28 January 1989	11.4 °C	2,284 mm	9	85
1988	31.4 °C14 August 1988	-10.1 °C7 January 1988	10.2 °C	2,662 mm	5	122
1987	33.0 °C16 July 1987	-9.8 °C2 February 1987	11.2 °C	2,024 mm	13	117
1986	32.9 °C29 August 1986	-8.7 °C30 November 1986	10.2 °C	2,400 mm	14	119
1985	35.0 °C14 August 1985	-11.7 °C16 December 1985	10.9 °C	2,497 mm	41	113
1984	34.4 °C16 August 1984	-9.0 °C29 November 1984	10.2 °C	2,164 mm	21	132
1983	32.5 °C14 August 1983	-9.5 °C23 November 1983	10.7 °C	2,823 mm	8	118
1982	31.9 °C28 August 1982	-9.6 °C19 December 1982	10.8 °C	2,374 mm	6	114
1981	32.4 °C30 July 1981	-8.7 °C27 February 1981	9.8 °C	2,691 mm	8	123
1980	31.0 °C11 September 1980	-9.6 °C2 January 1980	10.0 °C	2,705 mm	2	119
1979	32.3 °C27 August 1979	-9.6 °C29 January 1979	11.2 °C	2,680 mm	7	105
1978	34.1 °C2 August 1978	-10.4 °C17 February 1978	10.5 °C	2,400 mm	22	115
1977	32.4 °C4 August 1977	-9.6 °C16 February 1977	10.6 °C	2,295 mm	7	109
1976	32.2 °C24 July 1976	-8.4 °C30 December 1976	9.9 °C	2,883 mm	4	122
1975	32.0 °C18 August 1975	-9.7 °C2 December 1975	10.6 °C	2,552 mm	22	114
1974	31.1 °C11 August 1974	-8.4 °C2 December 1974	10.0 °C	2,612 mm	7	135
1973	32.5 °C15 August 1973	-8.7 °C2 December 1973	10.5 °C	2,259 mm	20	124
1972	32.5 °C9 August 1972	-11.6 °C7 January 1972	11.0 °C	2,731 mm	13	103
1971	33.2 °C3 August 1971	-9.8 °C9 December 1971	10.0 °C	2,801 mm	9	118
1970	32.4 °C22 August 1970	-8.9 °C5 January 1970	10.0 °C	2,478 mm	14	131
1969	32.8 °C4 August 1969	-8.9 °C31 December 1969	10.1 °C	2,633 mm	2	122
1968	32.3 °C31 July 1968	-10.1 °C24 February 1968	10.5 °C	2,446 mm	8	107
1967	31.5 °C24 July 1967	-10.8 °C31 December 1967	10.4 °C	2,336 mm	6	125
1966	31.3 °C20 August 1966	-10.5 °C4 December 1966	9.5 °C	2,653 mm	7	140
1965	32.2 °C6 August 1965	-11.4 °C6 January 1965	8.9 °C	2,776 mm	4	145
1964	33.1 °C19 August 1964	-7.9 °C9 January 1964	10.8 °C	2,906 mm	14	113
1963	33.3 °C10 August 1963	-11.5 °C2 January 1963	10.6 °C	2,356 mm	8	119
1962	33.7 °C3 August 1962	-7.0 °C25 November 1962	10.7 °C	2,086 mm	23	121
1961	33.5 °C29 July 1961	-9.2 °C3 February 1961	11.3 °C	2,798 mm	23	117
1960	31.7 °C22 July 1960	-8.7 °C30 November 1960	10.8 °C	2,418 mm	17	116
1959	32.2 °C8 August 1959	-9.4 °C9 January 1959	11.5 °C	2,370 mm	9	98
1958	30.3 °C18 August 1958	-10.1 °C21 November 1958	10.8 °C	2,383 mm	2	116
1957	32.7 °C22 August 1957	-9.2 °C3 February 1957	10.1 °C	2,458 mm	9	125
1956	32.6 °C9 September 1956	-10.0 °C27 February 1956	10.2 °C	2,628 mm	12	125
1955	32.8 °C15 July 1955	-10.8 °C24 December 1955	10.8 °C	2,604 mm	19	110
1954	33.6 °C18 August 1954	-13.6 °C18 December 1954	10.6 °C	2,319 mm	14	106
1953	31.1 °C10 August 1953	-7.1 °C31 January 1953	9.9 °C	3,114 mm	4	118
1952	30.3 °C19 August 1952	-11.0 °C25 February 1952	8.7 °C	2,527 mm	2	137
1951	31.7 °C19 August 1951	-10.6 °C16 January 1951	9.3 °C	2,141 mm	8	133
1950	32.6 °C19 August 1950	-12.6 °C4 December 1950	10.0 °C	2,193 mm	20	131
1949	31.4 °C29 July 1949	-9.6 °C11 January 1949	9.5 °C	2,392 mm	8	142
1948	31.0 °C9 September 1948	-10.0 °C5 February 1948	9.8 °C	2,194 mm	1	130
1947	30.2 °C8 July 1947	-11.6 °C29 January 1947	8.2 °C	2,492 mm	2	157
1946	31.4 °C18 July 1946	-9.7 °C11 February 1946	9.6 °C	2,342 mm	5	134
1945	30.1 °C1 August 1945	-12.4 °C22 February 1945	8.8 °C	3,059 mm	2	139
1944	29.7 °C22 August 1944	-12.1 °C7 January 1944	9.6 °C	2,193 mm	0	141
1943	29.4 °C31 July 1943	-12.2 °C30 December 1943	9.2 °C	1,787 mm	0	150
1942	31.8 °C1 September 1942	-14.1 °C22 December 1942	9.4 °C	1,694 mm	5	147
1941	31.6 °C24 August 1941	-12.3 °C18 December 1941	9.3 °C	2,076 mm	3	137
1940	30.0 °C24 July 1940	-11.7 °C17 January 1940	8.8 °C	2,201 mm	2	141

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?

Year

Across the whole year

Average daily high

16.0 °C

+1.2 °C

Hot days (≥ 30 °C)

39 d/yr

+25

Frost days (< 0 °C)

106 d/yr

-9

Annual rainfall

2638 mm

+173 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.2 °C	+0.4 °C	262 mm	-10 mm
Feb	1.3 °C	-1.2 °C	317 mm	+93 mm
Mar	8.1 °C	+2.0 °C	161 mm	-36 mm
Apr	14.4 °C	+1.4 °C	155 mm	+17 mm
May	19.4 °C	-0.2 °C	165 mm	+13 mm
Jun	25.0 °C	+2.0 °C	227 mm	+33 mm
Jul	30.6 °C	+4.1 °C	36 mm	-227 mm
Aug	29.0 °C	+1.1 °C	284 mm	+83 mm
Sep	26.0 °C	+2.3 °C	259 mm	+63 mm
Oct	18.3 °C	+0.7 °C	243 mm	+61 mm
Nov	11.6 °C	+0.2 °C	232 mm	+43 mm
Dec	5.4 °C	+0.7 °C	296 mm	+38 mm

The year's extremes

Hottest day

35.3 °C

30 Jul 2025

Coldest day

-9.3 °C

23 Dec 2025

Wettest day

65.4 mm

12 Aug 2025

Windiest day

29.3 km/h

29 Apr 2025

Strongest gust

91.8 km/h

16 Apr 2025

Hottest feels-like

39.2 °C

30 Jul 2025

Coldest feels-like

-13.8 °C

23 Dec 2025

Snowiest day

22.6 cm

26 Dec 2025

Sunniest day

14.0 h

18 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Uonuma?

Uonuma has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 2,465 mm of precipitation per year.

What is the hottest day ever recorded in Uonuma?

The hottest day measured in Uonuma between 1940 and 2025 was 24 August 2023, reaching 35.7 °C.

What is the coldest day in Uonuma?

The coldest day measured in Uonuma between 1940 and 2025 was 22 December 1942, at -14.1 °C.

Does it snow in Uonuma?

Yes. Uonuma gets on average 542.9 cm of snow per year and has around 115 frost days.

Has the climate of Uonuma warmed?

Yes: Uonuma warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Uonuma?

The wettest day measured in Uonuma between 1940 and 2025 was 2 July 1979, with 164 mm of rain in 24 hours.

What was the windiest day in Uonuma?

The windiest day measured in Uonuma between 1940 and 2025 was 19 January 2021, with winds reaching 41.1 km/h.

What is the warmest month in Uonuma?

The warmest month in Uonuma is August (23.7 °C on average); the coldest is January (-1.2 °C).

How much does it rain in Uonuma?

Uonuma receives on average 2,465 mm of precipitation per year, spread over about 236 rainy days.

Is it sunny in Uonuma?

Uonuma 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 Uonuma?

The heaviest 24-hour snowfall measured in Uonuma between 1940 and 2025 was 15 February 2014, with 50.1 cm.

Are there tropical nights in Uonuma?

Yes: Uonuma has on average 33 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Uonuma?

In Uonuma, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 6 August 2021, and the lowest was -18.8 °C on 11 February 1942.

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