Ōta climate — normals and trends

Q: What is the climate of Ōta?

Ōta has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,466 mm of precipitation per year.

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

The hottest day measured in Ōta between 1940 and 2025 was 5 August 2025, reaching 38.1 °C.

Q: What is the coldest day in Ōta?

The coldest day measured in Ōta between 1940 and 2025 was 16 February 1967, at -14.7 °C.

Q: Does it snow in Ōta?

Yes. Ōta gets on average 29.1 cm of snow per year and has around 53 frost days.

Q: Has the climate of Ōta warmed?

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

Q: What is the wettest day in Ōta?

The wettest day measured in Ōta between 1940 and 2025 was 26 September 1958, with 211 mm of rain in 24 hours.

Q: What was the windiest day in Ōta?

The windiest day measured in Ōta between 1940 and 2025 was 2 August 1982, with winds reaching 54.7 km/h.

Q: What is the warmest month in Ōta?

The warmest month in Ōta is August (26.0 °C on average); the coldest is January (2.9 °C).

Q: How much does it rain in Ōta?

Ōta receives on average 1,466 mm of precipitation per year, spread over about 151 rainy days.

Q: Is it sunny in Ōta?

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

Ōta (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.2 °C and it receives 1,466 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 (26.0 °C on average) and the coldest is January (2.9 °C). Rainfall peaks in September.

Ōta averages 53 frost days, 33 hot days (≥ 30 °C) and 151 rainy days per year.

Ōta has warmed by +2.7 °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 82 to 24 per year over the period.

The hottest day of the period reached 38.1 °C (on 5 August 2025) and the coldest -14.7 °C (on 16 February 1967).

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

ŌtaGunma

coords: 36.30°, 139.37°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthSeptemberDriest monthJanuary

Mean daily temperature

14.2°C

Average daily high

18.4°C

Average daily low

10.3°C

Annual rainfall

1,466mm

Sunshine / day

8.3h

Mean relative humidity

71%

Average peak wind

12.0km/h

Seasonal range

23.1°C

Frost days (< 0 °C)

53 d/yr

Hot days (≥ 30 °C)

33 d/yr

Rainy days (≥ 1 mm)

151 d/yr

Annual snowfall

29.1 cm

Average feels-like high

18.1 °C

Average feels-like low

9.5 °C

Average peak gust

27.7 km/h

Tropical nights (≥ 20 °C)

70 d/yr

Solar radiation

13.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.7 °C

since 1940

+0.3 °C per decade · r² = 0.70 · 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

38.1 °C

5 August 2025

Coldest day

-14.7 °C

16 February 1967

Wettest day

211 mm

26 September 1958

Windiest day

54.7 km/h

2 August 1982

Strongest gust

148.3 km/h

2 August 1982

Hottest feels-like

44.8 °C

5 August 2025

Coldest feels-like

-19.5 °C

16 February 1967

Snowiest day

32.8 cm

15 January 1998

Sunniest day

14.0 h

23 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.1 °C5 August 2025	-3.5 °C12 February 2025	15.7 °C	1,128 mm	79	55
2024	37.2 °C29 July 2024	-4.2 °C29 December 2024	16.4 °C	1,568 mm	71	25
2023	37.3 °C16 July 2023	-4.4 °C26 January 2023	16.5 °C	1,246 mm	74	29
2022	37.3 °C30 June 2022	-3.0 °C7 January 2022	15.5 °C	1,367 mm	54	42
2021	34.5 °C10 August 2021	-3.8 °C10 January 2021	15.5 °C	1,656 mm	36	31
2020	37.1 °C11 August 2020	-4.7 °C7 February 2020	15.6 °C	1,615 mm	44	16
2019	35.7 °C8 August 2019	-2.9 °C10 January 2019	15.6 °C	1,501 mm	40	26
2018	37.7 °C23 July 2018	-7.8 °C24 January 2018	15.9 °C	1,238 mm	55	33
2017	34.9 °C17 July 2017	-3.8 °C16 January 2017	14.9 °C	1,436 mm	43	31
2016	35.1 °C17 August 2016	-7.0 °C20 January 2016	15.3 °C	1,554 mm	38	33
2015	36.5 °C7 August 2015	-3.6 °C10 February 2015	15.5 °C	1,438 mm	39	26
2014	37.0 °C5 August 2014	-5.9 °C19 February 2014	14.8 °C	1,388 mm	34	57
2013	37.4 °C10 August 2013	-6.4 °C17 January 2013	15.1 °C	1,212 mm	46	47
2012	34.4 °C26 July 2012	-4.4 °C18 February 2012	14.4 °C	1,431 mm	51	52
2011	36.2 °C24 June 2011	-5.9 °C16 January 2011	14.7 °C	1,418 mm	43	49
2010	35.9 °C23 July 2010	-2.4 °C5 February 2010	15.1 °C	1,763 mm	56	35
2009	34.3 °C13 July 2009	-2.2 °C13 January 2009	15.0 °C	1,645 mm	15	20
2008	34.2 °C8 August 2008	-2.5 °C4 February 2008	14.8 °C	1,507 mm	34	24
2007	37.4 °C16 August 2007	-2.7 °C25 February 2007	15.2 °C	1,485 mm	43	9
2006	35.2 °C4 August 2006	-3.8 °C5 February 2006	15.0 °C	1,569 mm	28	24
2005	34.5 °C5 August 2005	-5.4 °C2 January 2005	14.7 °C	1,265 mm	48	45
2004	36.3 °C20 July 2004	-3.8 °C23 January 2004	15.6 °C	1,559 mm	53	22
2003	34.4 °C23 August 2003	-6.9 °C22 December 2003	14.3 °C	1,608 mm	25	34
2002	35.5 °C11 August 2002	-2.6 °C12 February 2002	14.9 °C	1,470 mm	44	33
2001	36.5 °C24 July 2001	-12.7 °C30 January 2001	14.6 °C	1,306 mm	40	56
2000	35.9 °C2 September 2000	-3.4 °C27 January 2000	15.0 °C	1,392 mm	44	31
1999	34.6 °C30 July 1999	-3.8 °C22 February 1999	15.2 °C	1,397 mm	36	33
1998	34.5 °C4 July 1998	-8.3 °C10 January 1998	15.0 °C	1,906 mm	30	40
1997	36.2 °C10 August 1997	-6.1 °C10 January 1997	14.8 °C	1,225 mm	37	34
1996	36.9 °C15 August 1996	-9.2 °C20 February 1996	14.1 °C	1,276 mm	34	43
1995	37.1 °C19 August 1995	-5.8 °C6 March 1995	14.5 °C	1,245 mm	42	41
1994	37.0 °C15 August 1994	-10.6 °C23 January 1994	15.1 °C	1,420 mm	59	47
1993	32.8 °C16 June 1993	-2.4 °C15 February 1993	14.0 °C	1,793 mm	12	27
1992	35.5 °C31 July 1992	-4.7 °C3 February 1992	14.4 °C	1,387 mm	36	29
1991	36.4 °C24 July 1991	-4.6 °C31 December 1991	14.9 °C	1,808 mm	33	32
1990	36.4 °C7 August 1990	-10.4 °C3 February 1990	15.3 °C	1,597 mm	49	28
1989	32.4 °C28 August 1989	-3.6 °C25 January 1989	14.5 °C	1,547 mm	19	20
1988	33.0 °C31 July 1988	-7.3 °C10 April 1988	13.6 °C	1,743 mm	15	40
1987	37.1 °C24 July 1987	-7.3 °C8 December 1987	14.5 °C	1,147 mm	40	57
1986	33.8 °C4 September 1986	-8.2 °C25 February 1986	13.4 °C	1,536 mm	26	69
1985	34.5 °C29 July 1985	-8.7 °C31 January 1985	14.0 °C	1,544 mm	44	52
1984	36.2 °C2 September 1984	-11.2 °C7 February 1984	12.9 °C	1,026 mm	40	93
1983	35.0 °C30 August 1983	-8.1 °C20 February 1983	13.8 °C	1,555 mm	28	57
1982	32.3 °C22 August 1982	-9.6 °C18 January 1982	14.2 °C	1,583 mm	18	41
1981	33.6 °C18 July 1981	-11.7 °C27 February 1981	13.2 °C	1,453 mm	23	71
1980	32.0 °C22 July 1980	-9.1 °C25 March 1980	13.4 °C	1,651 mm	8	71
1979	33.7 °C1 August 1979	-7.3 °C16 January 1979	14.8 °C	1,617 mm	27	52
1978	36.0 °C22 August 1978	-8.9 °C16 February 1978	14.1 °C	1,337 mm	53	69
1977	33.2 °C6 August 1977	-13.4 °C17 February 1977	13.8 °C	1,771 mm	20	64
1976	33.2 °C1 August 1976	-9.5 °C28 December 1976	13.3 °C	1,678 mm	19	53
1975	33.8 °C5 August 1975	-8.0 °C23 February 1975	14.0 °C	1,671 mm	38	63
1974	32.5 °C6 August 1974	-9.8 °C27 January 1974	13.5 °C	1,722 mm	26	56
1973	35.8 °C19 August 1973	-5.2 °C9 January 1973	14.2 °C	1,303 mm	43	56
1972	35.2 °C8 August 1972	-7.2 °C9 February 1972	14.3 °C	1,890 mm	27	44
1971	33.5 °C8 July 1971	-6.5 °C7 January 1971	13.6 °C	1,810 mm	32	58
1970	34.5 °C23 July 1970	-11.7 °C6 January 1970	13.4 °C	1,421 mm	35	72
1969	34.7 °C14 August 1969	-7.2 °C1 March 1969	13.8 °C	1,475 mm	28	65
1968	33.4 °C22 July 1968	-13.2 °C21 February 1968	13.8 °C	1,509 mm	19	61
1967	34.6 °C11 August 1967	-14.7 °C16 February 1967	13.9 °C	1,420 mm	38	79
1966	32.7 °C8 August 1966	-5.1 °C8 February 1966	13.2 °C	1,703 mm	21	77
1965	34.1 °C30 July 1965	-8.9 °C31 January 1965	12.9 °C	1,466 mm	15	75
1964	33.4 °C24 July 1964	-5.5 °C14 February 1964	14.1 °C	1,669 mm	38	41
1963	35.1 °C13 August 1963	-9.3 °C15 March 1963	13.8 °C	1,299 mm	30	68
1962	36.5 °C9 August 1962	-5.4 °C27 February 1962	14.2 °C	1,390 mm	39	54
1961	35.2 °C26 July 1961	-5.2 °C29 March 1961	14.8 °C	1,393 mm	41	61
1960	34.2 °C1 August 1960	-8.3 °C18 January 1960	14.3 °C	1,362 mm	29	38
1959	34.4 °C28 August 1959	-10.0 °C6 January 1959	14.5 °C	1,851 mm	36	46
1958	35.0 °C1 August 1958	-11.9 °C30 March 1958	14.1 °C	1,765 mm	27	51
1957	33.6 °C28 July 1957	-8.6 °C12 February 1957	13.7 °C	1,597 mm	21	62
1956	35.2 °C2 August 1956	-11.3 °C26 January 1956	13.6 °C	1,537 mm	32	73
1955	35.2 °C29 July 1955	-4.7 °C17 January 1955	14.5 °C	1,330 mm	41	52
1954	35.7 °C23 August 1954	-10.4 °C28 January 1954	13.8 °C	1,492 mm	25	50
1953	35.9 °C21 August 1953	-9.5 °C23 February 1953	13.7 °C	1,590 mm	21	53
1952	32.6 °C26 August 1952	-11.9 °C19 January 1952	12.4 °C	1,329 mm	13	96
1951	34.2 °C10 August 1951	-13.1 °C16 January 1951	12.9 °C	1,339 mm	22	81
1950	32.1 °C22 August 1950	-6.9 °C19 February 1950	13.3 °C	1,373 mm	19	91
1949	32.5 °C6 August 1949	-4.0 °C18 January 1949	13.1 °C	1,454 mm	18	81
1948	30.2 °C6 July 1948	-4.8 °C4 February 1948	13.5 °C	1,326 mm	4	71
1947	33.3 °C14 August 1947	-6.9 °C23 February 1947	12.2 °C	1,178 mm	23	96
1946	34.8 °C17 July 1946	-7.4 °C12 March 1946	13.2 °C	1,141 mm	26	95
1945	32.5 °C4 August 1945	-10.1 °C24 February 1945	12.5 °C	1,615 mm	12	95
1944	32.2 °C2 September 1944	-5.9 °C3 February 1944	13.3 °C	1,221 mm	16	89
1943	31.9 °C15 August 1943	-8.3 °C2 February 1943	12.9 °C	821 mm	14	92
1942	33.8 °C11 July 1942	-9.9 °C14 February 1942	13.1 °C	971 mm	28	87
1941	30.9 °C17 August 1941	-5.9 °C1 February 1941	12.8 °C	1,590 mm	9	82
1940	32.5 °C18 July 1940	-7.0 °C10 February 1940	12.7 °C	1,015 mm	21	91

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

20.5 °C

+2.1 °C

Hot days (≥ 30 °C)

79 d/yr

+46

Frost days (< 0 °C)

55 d/yr

Annual rainfall

1128 mm

-338 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	9.7 °C	+2.1 °C	33 mm	-10 mm
Feb	9.0 °C	+0.7 °C	9 mm	-45 mm
Mar	13.9 °C	+2.0 °C	140 mm	+49 mm
Apr	19.1 °C	+1.5 °C	132 mm	+25 mm
May	22.1 °C	+0.1 °C	188 mm	+55 mm
Jun	28.3 °C	+3.7 °C	129 mm	-57 mm
Jul	32.5 °C	+4.2 °C	88 mm	-108 mm
Aug	33.6 °C	+3.9 °C	68 mm	-103 mm
Sep	29.0 °C	+3.5 °C	173 mm	-34 mm
Oct	20.6 °C	+0.6 °C	110 mm	-51 mm
Nov	16.0 °C	+1.0 °C	19 mm	-54 mm
Dec	11.4 °C	+1.2 °C	39 mm	-4 mm

The year's extremes

Hottest day

38.1 °C

5 Aug 2025

Coldest day

-3.5 °C

12 Feb 2025

Wettest day

55.4 mm

5 Sep 2025

Windiest day

36.2 km/h

13 Feb 2025

Strongest gust

81.4 km/h

13 Feb 2025

Hottest feels-like

44.8 °C

5 Aug 2025

Coldest feels-like

-7.7 °C

24 Feb 2025

Snowiest day

8.3 cm

19 Mar 2025

Sunniest day

14.0 h

28 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 Ōta?

Ōta has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.2 °C and it receives 1,466 mm of precipitation per year.

What is the hottest day ever recorded in Ōta?

The hottest day measured in Ōta between 1940 and 2025 was 5 August 2025, reaching 38.1 °C.

What is the coldest day in Ōta?

The coldest day measured in Ōta between 1940 and 2025 was 16 February 1967, at -14.7 °C.

Does it snow in Ōta?

Yes. Ōta gets on average 29.1 cm of snow per year and has around 53 frost days.

Has the climate of Ōta warmed?

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

What is the wettest day in Ōta?

The wettest day measured in Ōta between 1940 and 2025 was 26 September 1958, with 211 mm of rain in 24 hours.

What was the windiest day in Ōta?

The windiest day measured in Ōta between 1940 and 2025 was 2 August 1982, with winds reaching 54.7 km/h.

What is the warmest month in Ōta?

The warmest month in Ōta is August (26.0 °C on average); the coldest is January (2.9 °C).

How much does it rain in Ōta?

Ōta receives on average 1,466 mm of precipitation per year, spread over about 151 rainy days.

Is it sunny in Ōta?

Ōta 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 Ōta?

The heaviest 24-hour snowfall measured in Ōta between 1940 and 2025 was 15 January 1998, with 32.8 cm.

Are there tropical nights in Ōta?

Yes: Ōta has on average 70 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ōta?

In Ōta, between 1940 and 2025, the highest apparent temperature reached 44.8 °C on 5 August 2025, and the lowest was -19.5 °C on 16 February 1967.

Compare Ōta with another city

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