Tainai climate — normals and trends

Q: What is the climate of Tainai?

Tainai has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.3 °C and it receives 2,283 mm of precipitation per year.

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

The hottest day measured in Tainai between 1940 and 2025 was 11 August 2023, reaching 37.3 °C.

Q: What is the coldest day in Tainai?

The coldest day measured in Tainai between 1940 and 2025 was 12 February 1942, at -12.7 °C.

Q: Does it snow in Tainai?

Yes. Tainai gets on average 350.2 cm of snow per year and has around 98 frost days.

Q: Has the climate of Tainai warmed?

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

Q: What is the wettest day in Tainai?

The wettest day measured in Tainai between 1940 and 2025 was 26 June 1978, with 158 mm of rain in 24 hours.

Q: What was the windiest day in Tainai?

The windiest day measured in Tainai between 1940 and 2025 was 31 March 1979, with winds reaching 45.3 km/h.

Q: What is the warmest month in Tainai?

The warmest month in Tainai is August (24.4 °C on average); the coldest is January (-0.6 °C).

Q: How much does it rain in Tainai?

Tainai receives on average 2,283 mm of precipitation per year, spread over about 234 rainy days.

Q: Is it sunny in Tainai?

Tainai gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

Tainai (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.3 °C and it receives 2,283 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 (24.4 °C on average) and the coldest is January (-0.6 °C). Rainfall peaks in July.

Tainai averages 98 frost days, 18 hot days (≥ 30 °C) and 234 rainy days per year.

Tainai 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 120 to 76 per year over the period.

The hottest day of the period reached 37.3 °C (on 11 August 2023) and the coldest -12.7 °C (on 12 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

TainaiNiigata

coords: 38.06°, 139.41°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthApril

Mean daily temperature

11.3°C

Average daily high

15.1°C

Average daily low

7.7°C

Annual rainfall

2,283mm

Sunshine / day

8.1h

Mean relative humidity

80%

Average peak wind

13.1km/h

Seasonal range

25.0°C

Frost days (< 0 °C)

98 d/yr

Hot days (≥ 30 °C)

18 d/yr

Rainy days (≥ 1 mm)

234 d/yr

Annual snowfall

350.2 cm

Average feels-like high

14.4 °C

Average feels-like low

6.2 °C

Average peak gust

38.8 km/h

Tropical nights (≥ 20 °C)

44 d/yr

Solar radiation

13.5 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

37.3 °C

11 August 2023

Coldest day

-12.7 °C

12 February 1942

Wettest day

158 mm

26 June 1978

Windiest day

45.3 km/h

31 March 1979

Strongest gust

134.6 km/h

4 April 2012

Hottest feels-like

42.7 °C

28 August 2020

Coldest feels-like

-17.9 °C

12 February 1942

Snowiest day

27.9 cm

24 December 1980

Sunniest day

14.2 h

12 June 1986

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	37.1 °C30 July 2025	-5.6 °C3 February 2025	12.8 °C	2,481 mm	50	84
2024	34.3 °C23 August 2024	-10.8 °C11 January 2024	13.4 °C	2,672 mm	36	76
2023	37.3 °C11 August 2023	-7.3 °C25 January 2023	13.5 °C	2,249 mm	54	71
2022	34.3 °C1 August 2022	-7.6 °C6 January 2022	12.6 °C	2,290 mm	35	83
2021	35.4 °C3 August 2021	-8.8 °C28 February 2021	12.7 °C	2,451 mm	25	75
2020	35.4 °C28 August 2020	-9.8 °C12 February 2020	12.8 °C	2,612 mm	26	52
2019	35.8 °C13 August 2019	-6.0 °C9 December 2019	12.6 °C	2,220 mm	28	83
2018	37.0 °C23 August 2018	-9.7 °C15 January 2018	12.6 °C	2,312 mm	38	82
2017	34.7 °C7 August 2017	-7.4 °C28 February 2017	11.7 °C	2,591 mm	15	90
2016	36.4 °C7 August 2016	-12.6 °C16 January 2016	12.6 °C	1,986 mm	24	74
2015	36.8 °C13 July 2015	-6.2 °C10 February 2015	12.6 °C	1,874 mm	24	71
2014	34.1 °C26 July 2014	-8.9 °C28 January 2014	11.7 °C	2,215 mm	16	92
2013	32.5 °C17 August 2013	-8.4 °C12 March 2013	11.7 °C	2,430 mm	12	99
2012	34.8 °C31 August 2012	-10.1 °C25 December 2012	11.7 °C	1,976 mm	42	111
2011	33.0 °C20 July 2011	-9.3 °C21 December 2011	11.7 °C	2,175 mm	34	107
2010	34.3 °C5 August 2010	-7.3 °C4 February 2010	12.2 °C	2,231 mm	42	89
2009	32.5 °C15 July 2009	-11.3 °C22 February 2009	12.0 °C	2,076 mm	11	84
2008	33.0 °C3 August 2008	-9.3 °C22 February 2008	12.0 °C	1,893 mm	15	89
2007	35.9 °C12 August 2007	-9.3 °C16 March 2007	12.3 °C	2,201 mm	22	81
2006	35.6 °C19 August 2006	-8.5 °C10 January 2006	11.9 °C	2,251 mm	19	85
2005	33.9 °C5 August 2005	-7.2 °C6 March 2005	11.6 °C	2,455 mm	18	97
2004	34.9 °C31 July 2004	-10.9 °C10 January 2004	12.6 °C	2,572 mm	26	86
2003	32.8 °C13 September 2003	-8.9 °C3 January 2003	11.7 °C	2,053 mm	7	83
2002	34.6 °C26 July 2002	-7.8 °C31 December 2002	11.8 °C	2,618 mm	23	74
2001	32.3 °C15 July 2001	-6.3 °C14 January 2001	11.7 °C	2,259 mm	12	93
2000	35.5 °C31 July 2000	-8.5 °C27 January 2000	12.0 °C	2,316 mm	29	84
1999	36.0 °C9 August 1999	-7.6 °C4 February 1999	12.2 °C	2,229 mm	29	90
1998	33.4 °C27 July 1998	-7.0 °C11 December 1998	12.4 °C	2,550 mm	12	88
1997	34.6 °C9 August 1997	-7.0 °C3 March 1997	11.7 °C	2,370 mm	15	94
1996	33.1 °C14 August 1996	-7.6 °C21 February 1996	10.8 °C	2,330 mm	13	100
1995	33.9 °C24 July 1995	-6.9 °C5 February 1995	11.3 °C	2,556 mm	10	87
1994	35.5 °C13 August 1994	-6.0 °C6 January 1994	12.4 °C	1,763 mm	37	90
1993	30.1 °C25 August 1993	-5.3 °C8 December 1993	11.1 °C	2,543 mm	1	74
1992	32.9 °C25 August 1992	-5.8 °C20 February 1992	11.7 °C	2,035 mm	18	74
1991	33.0 °C30 August 1991	-5.5 °C21 December 1991	11.9 °C	2,550 mm	10	81
1990	34.4 °C22 August 1990	-7.4 °C9 January 1990	12.8 °C	2,037 mm	19	67
1989	33.8 °C21 August 1989	-8.4 °C16 January 1989	12.1 °C	1,993 mm	19	66
1988	33.3 °C14 August 1988	-10.5 °C7 January 1988	10.8 °C	2,329 mm	16	106
1987	33.5 °C23 July 1987	-8.1 °C2 February 1987	11.9 °C	1,944 mm	15	100
1986	33.9 °C29 August 1986	-8.3 °C8 February 1986	10.8 °C	1,979 mm	15	99
1985	35.9 °C16 August 1985	-9.8 °C16 December 1985	11.4 °C	2,264 mm	40	107
1984	35.3 °C15 August 1984	-8.0 °C6 February 1984	10.7 °C	1,976 mm	29	120
1983	32.5 °C14 August 1983	-8.2 °C14 February 1983	11.2 °C	2,649 mm	13	101
1982	32.7 °C11 July 1982	-7.6 °C16 January 1982	11.5 °C	1,976 mm	8	92
1981	33.2 °C31 July 1981	-8.1 °C27 February 1981	10.5 °C	2,332 mm	15	101
1980	31.7 °C11 September 1980	-6.1 °C17 February 1980	10.6 °C	2,441 mm	2	108
1979	33.5 °C27 August 1979	-7.2 °C25 January 1979	11.7 °C	2,519 mm	10	97
1978	34.3 °C2 August 1978	-9.9 °C17 February 1978	11.1 °C	2,360 mm	28	95
1977	32.2 °C4 August 1977	-7.7 °C19 January 1977	10.9 °C	2,149 mm	13	91
1976	33.5 °C25 July 1976	-9.8 °C14 February 1976	10.3 °C	2,702 mm	6	112
1975	33.8 °C18 August 1975	-9.3 °C18 February 1975	11.3 °C	2,211 mm	29	100
1974	31.1 °C11 August 1974	-6.3 °C27 February 1974	10.5 °C	2,344 mm	9	114
1973	33.5 °C18 August 1973	-6.2 °C8 February 1973	11.1 °C	2,313 mm	25	107
1972	32.8 °C9 August 1972	-9.1 °C23 February 1972	11.6 °C	2,660 mm	18	81
1971	34.5 °C6 August 1971	-7.9 °C25 December 1971	10.6 °C	2,655 mm	13	104
1970	32.7 °C22 August 1970	-8.7 °C26 December 1970	10.6 °C	2,139 mm	21	123
1969	33.6 °C4 August 1969	-8.0 °C31 December 1969	10.6 °C	2,679 mm	3	118
1968	33.5 °C26 July 1968	-9.3 °C24 February 1968	11.2 °C	2,107 mm	13	96
1967	32.2 °C20 July 1967	-9.3 °C15 February 1967	11.1 °C	2,337 mm	11	105
1966	31.6 °C20 August 1966	-9.0 °C25 February 1966	10.2 °C	2,588 mm	11	127
1965	33.1 °C6 August 1965	-10.7 °C28 December 1965	9.7 °C	2,464 mm	4	134
1964	32.8 °C19 August 1964	-6.9 °C6 January 1964	11.3 °C	2,748 mm	18	99
1963	34.6 °C10 August 1963	-7.3 °C25 January 1963	11.2 °C	2,462 mm	8	97
1962	34.8 °C3 August 1962	-5.9 °C14 February 1962	11.3 °C	2,206 mm	26	102
1961	33.9 °C29 July 1961	-7.0 °C12 February 1961	11.8 °C	2,558 mm	23	100
1960	32.3 °C29 August 1960	-7.6 °C12 February 1960	11.4 °C	2,423 mm	17	98
1959	32.2 °C8 July 1959	-7.1 °C9 January 1959	11.9 °C	2,556 mm	6	81
1958	30.6 °C3 August 1958	-8.2 °C4 January 1958	11.3 °C	2,482 mm	4	94
1957	33.5 °C22 August 1957	-8.6 °C31 December 1957	10.7 °C	2,239 mm	13	104
1956	33.6 °C9 September 1956	-6.4 °C20 February 1956	10.7 °C	2,656 mm	14	111
1955	33.5 °C14 July 1955	-6.5 °C7 February 1955	11.6 °C	2,394 mm	31	94
1954	34.7 °C18 August 1954	-8.4 °C16 December 1954	11.2 °C	1,977 mm	17	89
1953	31.7 °C30 July 1953	-6.0 °C31 January 1953	10.6 °C	2,655 mm	8	92
1952	30.4 °C19 August 1952	-10.8 °C10 January 1952	9.2 °C	2,216 mm	1	132
1951	32.7 °C19 August 1951	-9.8 °C6 March 1951	9.8 °C	1,890 mm	9	118
1950	34.6 °C19 August 1950	-11.3 °C5 January 1950	10.7 °C	1,777 mm	36	120
1949	32.9 °C15 August 1949	-8.5 °C31 December 1949	10.2 °C	2,014 mm	13	115
1948	31.7 °C9 September 1948	-9.2 °C1 February 1948	10.5 °C	1,869 mm	5	113
1947	30.8 °C19 July 1947	-11.2 °C29 January 1947	8.9 °C	2,299 mm	2	142
1946	31.8 °C20 August 1946	-9.9 °C17 March 1946	10.2 °C	2,068 mm	13	123
1945	31.4 °C2 August 1945	-11.6 °C22 February 1945	9.4 °C	2,728 mm	8	126
1944	30.3 °C26 August 1944	-11.3 °C18 February 1944	10.2 °C	2,078 mm	3	129
1943	31.5 °C22 July 1943	-11.0 °C30 December 1943	10.0 °C	1,619 mm	18	135
1942	32.0 °C15 August 1942	-12.7 °C12 February 1942	9.9 °C	1,818 mm	9	130
1941	33.5 °C24 August 1941	-10.2 °C12 February 1941	9.7 °C	1,906 mm	5	126
1940	30.7 °C25 August 1940	-9.7 °C27 January 1940	9.5 °C	2,186 mm	3	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

16.8 °C

+1.7 °C

Hot days (≥ 30 °C)

50 d/yr

+32

Frost days (< 0 °C)

84 d/yr

-14

Annual rainfall

2482 mm

+199 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.5 °C	+0.6 °C	258 mm	+45 mm
Feb	2.5 °C	-0.1 °C	215 mm	+50 mm
Mar	7.9 °C	+1.6 °C	133 mm	-31 mm
Apr	14.6 °C	+1.1 °C	185 mm	+50 mm
May	20.3 °C	+0.6 °C	210 mm	+67 mm
Jun	26.1 °C	+2.8 °C	140 mm	-49 mm
Jul	32.4 °C	+5.6 °C	22 mm	-281 mm
Aug	29.9 °C	+1.5 °C	332 mm	+119 mm
Sep	26.6 °C	+2.7 °C	291 mm	+102 mm
Oct	18.6 °C	+0.8 °C	226 mm	+63 mm
Nov	12.3 °C	+0.8 °C	218 mm	+38 mm
Dec	7.0 °C	+2.0 °C	255 mm	+25 mm

The year's extremes

Hottest day

37.1 °C

30 Jul 2025

Coldest day

-5.6 °C

3 Feb 2025

Wettest day

94.5 mm

8 Sep 2025

Windiest day

42.2 km/h

14 Dec 2025

Strongest gust

89.3 km/h

15 Dec 2025

Hottest feels-like

41.8 °C

30 Jul 2025

Coldest feels-like

-9.6 °C

3 Feb 2025

Snowiest day

16.4 cm

8 Jan 2025

Sunniest day

14.1 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 Tainai?

Tainai has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.3 °C and it receives 2,283 mm of precipitation per year.

What is the hottest day ever recorded in Tainai?

The hottest day measured in Tainai between 1940 and 2025 was 11 August 2023, reaching 37.3 °C.

What is the coldest day in Tainai?

The coldest day measured in Tainai between 1940 and 2025 was 12 February 1942, at -12.7 °C.

Does it snow in Tainai?

Yes. Tainai gets on average 350.2 cm of snow per year and has around 98 frost days.

Has the climate of Tainai warmed?

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

What is the wettest day in Tainai?

The wettest day measured in Tainai between 1940 and 2025 was 26 June 1978, with 158 mm of rain in 24 hours.

What was the windiest day in Tainai?

The windiest day measured in Tainai between 1940 and 2025 was 31 March 1979, with winds reaching 45.3 km/h.

What is the warmest month in Tainai?

The warmest month in Tainai is August (24.4 °C on average); the coldest is January (-0.6 °C).

How much does it rain in Tainai?

Tainai receives on average 2,283 mm of precipitation per year, spread over about 234 rainy days.

Is it sunny in Tainai?

Tainai gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

What is the biggest single-day snowfall in Tainai?

The heaviest 24-hour snowfall measured in Tainai between 1940 and 2025 was 24 December 1980, with 27.9 cm.

Are there tropical nights in Tainai?

Yes: Tainai has on average 44 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Tainai?

In Tainai, between 1940 and 2025, the highest apparent temperature reached 42.7 °C on 28 August 2020, and the lowest was -17.9 °C on 12 February 1942.

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