Ojiya climate — normals and trends

Q: What is the climate of Ojiya?

Ojiya has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 2,126 mm of precipitation per year.

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

The hottest day measured in Ojiya between 1940 and 2025 was 13 July 2015, reaching 38.4 °C.

Q: What is the coldest day in Ojiya?

The coldest day measured in Ojiya between 1940 and 2025 was 17 January 1942, at -13.6 °C.

Q: Does it snow in Ojiya?

Yes. Ojiya gets on average 333.2 cm of snow per year and has around 101 frost days.

Q: Has the climate of Ojiya warmed?

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

Q: What is the wettest day in Ojiya?

The wettest day measured in Ojiya between 1940 and 2025 was 2 July 1979, with 174 mm of rain in 24 hours.

Q: What was the windiest day in Ojiya?

The windiest day measured in Ojiya between 1940 and 2025 was 16 September 1961, with winds reaching 47.9 km/h.

Q: What is the warmest month in Ojiya?

The warmest month in Ojiya is August (25.1 °C on average); the coldest is January (-0.2 °C).

Q: How much does it rain in Ojiya?

Ojiya receives on average 2,126 mm of precipitation per year, spread over about 227 rainy days.

Q: Is it sunny in Ojiya?

Ojiya gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.

Ojiya (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.9 °C and it receives 2,126 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 (25.1 °C on average) and the coldest is January (-0.2 °C). Rainfall peaks in July.

Ojiya averages 101 frost days, 30 hot days (≥ 30 °C) and 227 rainy days per year.

Ojiya 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 123 to 79 per year over the period.

The hottest day of the period reached 38.4 °C (on 13 July 2015) and the coldest -13.6 °C (on 17 January 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

OjiyaNiigata

coords: 37.30°, 138.80°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthApril

Mean daily temperature

11.9°C

Average daily high

16.5°C

Average daily low

7.8°C

Annual rainfall

2,126mm

Sunshine / day

8.5h

Mean relative humidity

79%

Average peak wind

11.4km/h

Seasonal range

25.3°C

Frost days (< 0 °C)

101 d/yr

Hot days (≥ 30 °C)

30 d/yr

Rainy days (≥ 1 mm)

227 d/yr

Annual snowfall

333.2 cm

Average feels-like high

16.4 °C

Average feels-like low

6.4 °C

Average peak gust

32.6 km/h

Tropical nights (≥ 20 °C)

46 d/yr

Solar radiation

14.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.7 °C

since 1940

+0.3 °C per decade · r² = 0.67 · 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

38.4 °C

13 July 2015

Coldest day

-13.6 °C

17 January 1942

Wettest day

174 mm

2 July 1979

Windiest day

47.9 km/h

16 September 1961

Strongest gust

128.9 km/h

16 September 1961

Hottest feels-like

44.0 °C

24 August 2023

Coldest feels-like

-18.2 °C

17 January 1942

Snowiest day

47.4 cm

15 February 2014

Sunniest day

14.0 h

10 June 2020

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.8 °C30 July 2025	-7.6 °C19 January 2025	13.1 °C	2,257 mm	66	92
2024	36.4 °C23 August 2024	-11.1 °C9 January 2024	13.9 °C	2,320 mm	61	84
2023	38.4 °C11 August 2023	-7.8 °C28 February 2023	14.1 °C	2,026 mm	68	81
2022	35.8 °C24 June 2022	-7.2 °C6 January 2022	13.4 °C	2,164 mm	54	83
2021	36.1 °C3 August 2021	-11.6 °C21 January 2021	13.4 °C	2,204 mm	36	81
2020	36.3 °C3 September 2020	-10.5 °C7 February 2020	13.5 °C	2,550 mm	38	61
2019	36.5 °C13 August 2019	-8.2 °C15 February 2019	13.4 °C	2,309 mm	37	86
2018	37.8 °C22 August 2018	-11.9 °C15 January 2018	13.5 °C	1,826 mm	49	82
2017	36.8 °C7 August 2017	-9.1 °C18 December 2017	12.5 °C	2,415 mm	29	93
2016	34.4 °C7 August 2016	-11.1 °C8 February 2016	13.4 °C	2,037 mm	33	78
2015	38.4 °C13 July 2015	-9.0 °C31 December 2015	13.4 °C	1,854 mm	31	77
2014	35.6 °C5 August 2014	-11.2 °C12 February 2014	12.4 °C	2,057 mm	30	93
2013	34.5 °C31 August 2013	-11.0 °C12 March 2013	12.5 °C	2,306 mm	31	90
2012	36.4 °C4 August 2012	-12.1 °C25 December 2012	12.5 °C	2,024 mm	50	108
2011	35.6 °C20 July 2011	-10.2 °C21 December 2011	12.4 °C	1,969 mm	52	111
2010	35.1 °C5 August 2010	-8.9 °C27 December 2010	12.9 °C	2,180 mm	50	84
2009	35.1 °C15 July 2009	-11.6 °C22 February 2009	12.8 °C	1,929 mm	22	83
2008	34.3 °C3 August 2008	-8.8 °C22 January 2008	12.9 °C	1,851 mm	29	84
2007	38.1 °C12 August 2007	-9.7 °C5 February 2007	13.1 °C	1,790 mm	36	83
2006	37.8 °C19 August 2006	-8.0 °C7 January 2006	12.8 °C	2,079 mm	36	86
2005	34.5 °C21 June 2005	-10.7 °C24 January 2005	12.5 °C	2,089 mm	40	97
2004	36.8 °C5 July 2004	-10.0 °C10 January 2004	13.4 °C	2,337 mm	40	80
2003	35.0 °C13 September 2003	-8.5 °C3 January 2003	12.5 °C	1,858 mm	18	83
2002	36.4 °C26 July 2002	-6.2 °C20 January 2002	12.6 °C	2,217 mm	35	81
2001	34.2 °C15 July 2001	-6.6 °C12 March 2001	12.5 °C	2,052 mm	32	94
2000	37.1 °C31 July 2000	-11.5 °C27 January 2000	12.7 °C	2,119 mm	46	92
1999	37.5 °C9 August 1999	-8.0 °C5 February 1999	12.9 °C	2,204 mm	38	91
1998	34.6 °C27 July 1998	-6.6 °C8 January 1998	13.3 °C	2,353 mm	21	82
1997	36.5 °C9 August 1997	-7.1 °C5 December 1997	12.4 °C	2,109 mm	25	89
1996	34.4 °C14 August 1996	-8.8 °C7 December 1996	11.6 °C	2,110 mm	31	106
1995	35.3 °C24 July 1995	-9.5 °C3 January 1995	11.9 °C	2,110 mm	28	93
1994	37.5 °C14 August 1994	-8.9 °C26 December 1994	13.2 °C	1,717 mm	50	95
1993	32.5 °C4 September 1993	-6.3 °C22 March 1993	11.9 °C	2,363 mm	7	97
1992	34.9 °C25 August 1992	-10.2 °C16 January 1992	12.4 °C	1,894 mm	30	78
1991	35.0 °C19 August 1991	-8.3 °C21 December 1991	12.7 °C	2,272 mm	21	89
1990	36.5 °C23 August 1990	-9.5 °C21 January 1990	13.6 °C	1,803 mm	45	64
1989	33.4 °C25 July 1989	-7.4 °C16 January 1989	12.8 °C	2,056 mm	24	65
1988	33.7 °C14 August 1988	-11.1 °C7 January 1988	11.5 °C	2,268 mm	19	109
1987	34.9 °C8 August 1987	-9.8 °C2 February 1987	12.5 °C	1,744 mm	27	99
1986	35.0 °C29 August 1986	-8.2 °C20 January 1986	11.5 °C	2,018 mm	25	100
1985	37.2 °C30 August 1985	-11.3 °C16 December 1985	12.2 °C	2,218 mm	49	101
1984	36.2 °C16 August 1984	-7.7 °C15 March 1984	11.4 °C	1,841 mm	42	124
1983	34.4 °C14 August 1983	-8.3 °C28 December 1983	12.0 °C	2,412 mm	27	101
1982	33.9 °C28 August 1982	-9.5 °C19 December 1982	12.2 °C	2,006 mm	12	94
1981	34.2 °C30 July 1981	-7.3 °C27 February 1981	11.2 °C	2,292 mm	27	111
1980	33.6 °C11 September 1980	-9.7 °C2 January 1980	11.2 °C	2,376 mm	8	105
1979	34.8 °C27 August 1979	-9.1 °C29 January 1979	12.5 °C	2,416 mm	19	93
1978	36.2 °C2 August 1978	-10.5 °C17 February 1978	11.7 °C	2,053 mm	46	103
1977	34.8 °C4 August 1977	-9.2 °C5 January 1977	11.7 °C	2,023 mm	19	105
1976	34.2 °C25 July 1976	-9.2 °C11 January 1976	11.2 °C	2,548 mm	13	110
1975	34.1 °C5 August 1975	-9.3 °C5 January 1975	12.0 °C	2,281 mm	39	104
1974	33.1 °C2 September 1974	-7.4 °C21 January 1974	11.3 °C	2,212 mm	21	116
1973	34.8 °C18 August 1973	-9.2 °C17 January 1973	11.8 °C	2,007 mm	39	116
1972	34.7 °C25 July 1972	-10.8 °C7 January 1972	12.2 °C	2,478 mm	28	87
1971	35.3 °C6 August 1971	-10.1 °C14 December 1971	11.3 °C	2,455 mm	20	105
1970	34.1 °C22 August 1970	-9.0 °C20 January 1970	11.3 °C	2,110 mm	33	123
1969	33.8 °C4 August 1969	-10.8 °C31 December 1969	11.3 °C	2,279 mm	18	114
1968	34.2 °C26 July 1968	-8.6 °C24 February 1968	11.8 °C	2,079 mm	23	98
1967	33.0 °C19 July 1967	-11.1 °C31 December 1967	11.8 °C	2,004 mm	27	111
1966	33.1 °C20 August 1966	-8.6 °C13 February 1966	10.9 °C	2,247 mm	23	127
1965	34.6 °C6 August 1965	-12.7 °C6 January 1965	10.3 °C	2,366 mm	10	131
1964	34.7 °C19 August 1964	-9.0 °C6 January 1964	12.1 °C	2,627 mm	33	103
1963	36.1 °C10 August 1963	-9.8 °C2 January 1963	11.9 °C	2,110 mm	21	109
1962	36.4 °C3 August 1962	-7.9 °C13 December 1962	12.1 °C	1,869 mm	35	106
1961	34.9 °C29 July 1961	-8.2 °C2 January 1961	12.6 °C	2,520 mm	43	109
1960	33.4 °C22 July 1960	-8.2 °C20 December 1960	12.1 °C	2,177 mm	32	105
1959	34.3 °C8 August 1959	-10.0 °C9 January 1959	12.7 °C	2,176 mm	20	85
1958	32.5 °C18 August 1958	-10.7 °C12 January 1958	12.1 °C	2,096 mm	17	106
1957	35.3 °C22 August 1957	-8.1 °C3 February 1957	11.4 °C	2,121 mm	20	106
1956	34.7 °C9 September 1956	-9.1 °C27 February 1956	11.5 °C	2,232 mm	20	114
1955	35.4 °C19 July 1955	-9.1 °C24 December 1955	12.2 °C	2,221 mm	38	93
1954	35.4 °C18 August 1954	-13.2 °C13 January 1954	11.9 °C	1,930 mm	27	92
1953	32.7 °C10 August 1953	-7.4 °C28 January 1953	11.3 °C	2,597 mm	13	96
1952	32.0 °C19 August 1952	-11.0 °C6 December 1952	10.0 °C	2,359 mm	8	125
1951	34.6 °C19 August 1951	-11.0 °C16 January 1951	10.6 °C	1,811 mm	26	118
1950	34.5 °C19 August 1950	-9.9 °C5 January 1950	11.4 °C	1,894 mm	46	121
1949	33.8 °C15 August 1949	-10.3 °C18 January 1949	10.9 °C	2,070 mm	24	122
1948	33.0 °C9 September 1948	-9.1 °C5 February 1948	11.1 °C	1,936 mm	13	112
1947	32.2 °C18 July 1947	-11.1 °C21 December 1947	9.6 °C	2,138 mm	16	143
1946	33.2 °C28 July 1946	-10.0 °C11 February 1946	10.9 °C	1,921 mm	25	122
1945	32.4 °C25 August 1945	-12.0 °C22 February 1945	10.1 °C	2,618 mm	10	133
1944	31.4 °C22 August 1944	-11.9 °C7 January 1944	10.9 °C	2,026 mm	9	128
1943	31.9 °C22 July 1943	-13.3 °C30 December 1943	10.5 °C	1,631 mm	17	139
1942	34.2 °C1 September 1942	-13.6 °C17 January 1942	10.7 °C	1,529 mm	33	127
1941	33.7 °C24 August 1941	-12.6 °C12 February 1941	10.5 °C	1,800 mm	7	126
1940	32.0 °C14 July 1940	-11.0 °C17 January 1940	10.1 °C	1,910 mm	9	132

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

17.8 °C

+1.3 °C

Hot days (≥ 30 °C)

66 d/yr

+36

Frost days (< 0 °C)

92 d/yr

-9

Annual rainfall

2257 mm

+131 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	4.0 °C	+0.8 °C	219 mm	+7 mm
Feb	2.9 °C	-1.0 °C	209 mm	+39 mm
Mar	10.0 °C	+2.1 °C	147 mm	-9 mm
Apr	16.3 °C	+0.8 °C	123 mm	+2 mm
May	21.1 °C	-0.3 °C	126 mm	-3 mm
Jun	26.6 °C	+1.9 °C	195 mm	+24 mm
Jul	32.8 °C	+4.6 °C	29 mm	-222 mm
Aug	31.0 °C	+1.3 °C	284 mm	+91 mm
Sep	27.6 °C	+2.5 °C	239 mm	+53 mm
Oct	19.5 °C	+0.5 °C	239 mm	+77 mm
Nov	13.2 °C	+0.3 °C	191 mm	+29 mm
Dec	7.5 °C	+1.1 °C	257 mm	+44 mm

The year's extremes

Hottest day

36.8 °C

30 Jul 2025

Coldest day

-7.6 °C

19 Jan 2025

Wettest day

62.5 mm

12 Aug 2025

Windiest day

31.8 km/h

29 Apr 2025

Strongest gust

86.8 km/h

16 Apr 2025

Hottest feels-like

41.8 °C

30 Jul 2025

Coldest feels-like

-12.3 °C

19 Jan 2025

Snowiest day

17.6 cm

26 Dec 2025

Sunniest day

14.0 h

5 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 Ojiya?

Ojiya has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.9 °C and it receives 2,126 mm of precipitation per year.

What is the hottest day ever recorded in Ojiya?

The hottest day measured in Ojiya between 1940 and 2025 was 13 July 2015, reaching 38.4 °C.

What is the coldest day in Ojiya?

The coldest day measured in Ojiya between 1940 and 2025 was 17 January 1942, at -13.6 °C.

Does it snow in Ojiya?

Yes. Ojiya gets on average 333.2 cm of snow per year and has around 101 frost days.

Has the climate of Ojiya warmed?

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

What is the wettest day in Ojiya?

The wettest day measured in Ojiya between 1940 and 2025 was 2 July 1979, with 174 mm of rain in 24 hours.

What was the windiest day in Ojiya?

The windiest day measured in Ojiya between 1940 and 2025 was 16 September 1961, with winds reaching 47.9 km/h.

What is the warmest month in Ojiya?

The warmest month in Ojiya is August (25.1 °C on average); the coldest is January (-0.2 °C).

How much does it rain in Ojiya?

Ojiya receives on average 2,126 mm of precipitation per year, spread over about 227 rainy days.

Is it sunny in Ojiya?

Ojiya 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 Ojiya?

The heaviest 24-hour snowfall measured in Ojiya between 1940 and 2025 was 15 February 2014, with 47.4 cm.

Are there tropical nights in Ojiya?

Yes: Ojiya has on average 46 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ojiya?

In Ojiya, between 1940 and 2025, the highest apparent temperature reached 44.0 °C on 24 August 2023, and the lowest was -18.2 °C on 17 January 1942.

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