Suibara climate — normals and trends

Q: What is the climate of Suibara?

Suibara has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 2,208 mm of precipitation per year.

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

The hottest day measured in Suibara between 1940 and 2025 was 23 August 2023, reaching 37.1 °C.

Q: What is the coldest day in Suibara?

The coldest day measured in Suibara between 1940 and 2025 was 15 February 1942, at -12.9 °C.

Q: Does it snow in Suibara?

Yes. Suibara gets on average 298.6 cm of snow per year and has around 97 frost days.

Q: Has the climate of Suibara warmed?

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

Q: What is the wettest day in Suibara?

The wettest day measured in Suibara between 1940 and 2025 was 26 June 1978, with 164 mm of rain in 24 hours.

Q: What was the windiest day in Suibara?

The windiest day measured in Suibara between 1940 and 2025 was 19 January 2021, with winds reaching 46.2 km/h.

Q: What is the warmest month in Suibara?

The warmest month in Suibara is August (24.7 °C on average); the coldest is January (-0.3 °C).

Q: How much does it rain in Suibara?

Suibara receives on average 2,208 mm of precipitation per year, spread over about 233 rainy days.

Q: Is it sunny in Suibara?

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

Suibara (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 2,208 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 (24.7 °C on average) and the coldest is January (-0.3 °C). Rainfall peaks in July.

Suibara averages 97 frost days, 21 hot days (≥ 30 °C) and 233 rainy days per year.

Suibara 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 119 to 75 per year over the period.

The hottest day of the period reached 37.1 °C (on 23 August 2023) and the coldest -12.9 °C (on 15 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

SuibaraNiigata

coords: 37.85°, 139.23°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthApril

Mean daily temperature

11.6°C

Average daily high

15.6°C

Average daily low

7.9°C

Annual rainfall

2,208mm

Sunshine / day

8.1h

Mean relative humidity

80%

Average peak wind

12.6km/h

Seasonal range

25.0°C

Frost days (< 0 °C)

97 d/yr

Hot days (≥ 30 °C)

21 d/yr

Rainy days (≥ 1 mm)

233 d/yr

Annual snowfall

298.6 cm

Average feels-like high

15.2 °C

Average feels-like low

6.5 °C

Average peak gust

38.0 km/h

Tropical nights (≥ 20 °C)

48 d/yr

Solar radiation

13.6 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

37.1 °C

23 August 2023

Coldest day

-12.9 °C

15 February 1942

Wettest day

164 mm

26 June 1978

Windiest day

46.2 km/h

19 January 2021

Strongest gust

143.3 km/h

18 September 1945

Hottest feels-like

43.1 °C

28 August 2020

Coldest feels-like

-17.9 °C

15 February 1942

Snowiest day

28.7 cm

15 February 2014

Sunniest day

14.2 h

12 June 1986

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.2 °C30 July 2025	-5.8 °C19 January 2025	12.9 °C	2,318 mm	52	85
2024	34.8 °C23 August 2024	-10.6 °C11 January 2024	13.6 °C	2,552 mm	45	76
2023	37.1 °C23 August 2023	-7.3 °C30 January 2023	13.8 °C	2,179 mm	60	71
2022	34.7 °C1 August 2022	-7.7 °C6 January 2022	12.9 °C	2,242 mm	47	80
2021	35.8 °C3 August 2021	-8.1 °C28 February 2021	13.0 °C	2,379 mm	28	79
2020	35.7 °C3 September 2020	-8.6 °C6 February 2020	13.2 °C	2,584 mm	31	52
2019	35.3 °C13 August 2019	-6.3 °C15 February 2019	13.0 °C	2,177 mm	31	85
2018	36.8 °C23 August 2018	-11.0 °C15 January 2018	13.0 °C	2,056 mm	43	81
2017	35.5 °C7 August 2017	-7.0 °C28 February 2017	12.1 °C	2,500 mm	18	87
2016	35.7 °C7 August 2016	-11.3 °C16 January 2016	13.0 °C	1,995 mm	24	73
2015	36.8 °C13 July 2015	-6.1 °C21 January 2015	12.9 °C	1,852 mm	26	75
2014	34.3 °C26 July 2014	-10.3 °C15 January 2014	12.0 °C	2,125 mm	19	94
2013	33.0 °C31 August 2013	-8.7 °C17 February 2013	12.1 °C	2,425 mm	20	101
2012	35.0 °C17 September 2012	-10.0 °C25 December 2012	12.0 °C	1,976 mm	44	108
2011	33.7 °C20 July 2011	-9.1 °C28 March 2011	12.0 °C	2,149 mm	38	108
2010	34.6 °C5 August 2010	-7.8 °C31 March 2010	12.5 °C	2,188 mm	46	85
2009	33.2 °C15 July 2009	-10.5 °C22 February 2009	12.4 °C	1,963 mm	14	86
2008	33.5 °C3 August 2008	-8.8 °C22 February 2008	12.4 °C	1,843 mm	16	84
2007	36.2 °C12 August 2007	-8.7 °C5 February 2007	12.7 °C	2,110 mm	23	78
2006	35.3 °C17 August 2006	-8.7 °C10 January 2006	12.3 °C	2,134 mm	20	82
2005	33.3 °C5 August 2005	-7.8 °C6 March 2005	12.0 °C	2,282 mm	24	96
2004	35.5 °C5 July 2004	-10.7 °C10 January 2004	12.9 °C	2,444 mm	28	82
2003	33.9 °C13 September 2003	-8.8 °C3 January 2003	12.1 °C	1,956 mm	11	82
2002	35.3 °C1 September 2002	-7.0 °C31 December 2002	12.2 °C	2,433 mm	26	75
2001	33.0 °C15 July 2001	-6.0 °C14 January 2001	12.1 °C	2,175 mm	16	91
2000	35.8 °C31 July 2000	-9.5 °C27 January 2000	12.3 °C	2,240 mm	34	91
1999	35.4 °C27 July 1999	-7.5 °C5 February 1999	12.5 °C	2,222 mm	30	90
1998	33.9 °C27 July 1998	-5.8 °C11 December 1998	12.8 °C	2,438 mm	13	82
1997	35.2 °C9 August 1997	-6.5 °C22 January 1997	12.0 °C	2,321 mm	18	87
1996	33.5 °C14 August 1996	-7.8 °C20 February 1996	11.2 °C	2,175 mm	16	99
1995	34.6 °C24 July 1995	-7.6 °C17 January 1995	11.6 °C	2,374 mm	16	88
1994	35.0 °C13 August 1994	-6.4 °C6 January 1994	12.7 °C	1,696 mm	40	94
1993	30.6 °C4 September 1993	-5.4 °C16 December 1993	11.4 °C	2,418 mm	4	77
1992	33.7 °C25 August 1992	-6.1 °C16 January 1992	12.0 °C	1,950 mm	23	76
1991	33.6 °C26 July 1991	-6.0 °C21 December 1991	12.3 °C	2,426 mm	13	84
1990	34.8 °C22 August 1990	-8.3 °C21 January 1990	13.1 °C	1,952 mm	29	65
1989	33.2 °C21 August 1989	-7.9 °C16 January 1989	12.4 °C	1,995 mm	21	68
1988	33.4 °C14 August 1988	-10.4 °C7 January 1988	11.1 °C	2,285 mm	14	106
1987	34.3 °C16 July 1987	-8.6 °C2 February 1987	12.2 °C	1,866 mm	17	95
1986	34.5 °C29 August 1986	-7.2 °C8 February 1986	11.1 °C	1,883 mm	19	92
1985	35.3 °C30 August 1985	-10.2 °C16 December 1985	11.7 °C	2,288 mm	42	105
1984	34.8 °C15 August 1984	-7.3 °C12 February 1984	11.1 °C	1,914 mm	32	118
1983	32.9 °C14 August 1983	-8.4 °C28 December 1983	11.5 °C	2,689 mm	13	99
1982	33.3 °C11 July 1982	-8.4 °C16 January 1982	11.8 °C	1,960 mm	9	93
1981	33.5 °C31 July 1981	-6.7 °C27 February 1981	10.8 °C	2,236 mm	17	102
1980	32.6 °C11 September 1980	-6.4 °C12 January 1980	10.8 °C	2,405 mm	4	104
1979	34.0 °C27 August 1979	-7.2 °C29 January 1979	12.1 °C	2,404 mm	10	92
1978	34.4 °C2 August 1978	-10.4 °C17 February 1978	11.4 °C	2,368 mm	33	96
1977	33.0 °C4 August 1977	-8.4 °C19 January 1977	11.2 °C	1,997 mm	13	95
1976	33.7 °C25 July 1976	-9.4 °C14 February 1976	10.7 °C	2,688 mm	7	112
1975	34.0 °C18 August 1975	-8.2 °C18 February 1975	11.7 °C	2,176 mm	33	99
1974	31.7 °C25 August 1974	-6.0 °C21 January 1974	10.9 °C	2,280 mm	12	114
1973	33.6 °C18 August 1973	-6.9 °C8 February 1973	11.5 °C	2,166 mm	30	106
1972	33.2 °C25 July 1972	-9.3 °C26 February 1972	11.9 °C	2,591 mm	19	80
1971	35.0 °C6 August 1971	-8.0 °C25 December 1971	10.9 °C	2,580 mm	14	106
1970	33.6 °C22 August 1970	-9.3 °C26 December 1970	10.9 °C	2,137 mm	24	120
1969	33.7 °C4 August 1969	-9.0 °C31 December 1969	10.9 °C	2,575 mm	8	116
1968	33.6 °C26 July 1968	-8.5 °C24 February 1968	11.5 °C	2,043 mm	15	92
1967	32.5 °C20 July 1967	-10.1 °C15 February 1967	11.4 °C	2,217 mm	14	104
1966	32.2 °C20 August 1966	-8.4 °C25 February 1966	10.5 °C	2,420 mm	14	122
1965	33.5 °C6 August 1965	-11.0 °C28 December 1965	10.0 °C	2,387 mm	6	129
1964	33.3 °C22 August 1964	-8.2 °C6 January 1964	11.6 °C	2,654 mm	25	91
1963	34.8 °C10 August 1963	-7.6 °C2 January 1963	11.5 °C	2,355 mm	10	100
1962	34.9 °C3 August 1962	-6.1 °C14 February 1962	11.7 °C	2,019 mm	29	96
1961	34.0 °C29 July 1961	-7.0 °C12 February 1961	12.2 °C	2,600 mm	35	99
1960	33.1 °C29 August 1960	-8.1 °C12 February 1960	11.7 °C	2,398 mm	20	101
1959	32.7 °C8 July 1959	-8.5 °C9 January 1959	12.2 °C	2,440 mm	12	83
1958	31.6 °C18 August 1958	-8.3 °C12 January 1958	11.7 °C	2,322 mm	6	94
1957	34.2 °C21 August 1957	-7.8 °C31 December 1957	11.1 °C	2,117 mm	14	102
1956	34.0 °C9 September 1956	-7.4 °C27 February 1956	11.1 °C	2,480 mm	14	105
1955	33.7 °C16 July 1955	-7.5 °C7 February 1955	11.9 °C	2,312 mm	36	90
1954	34.8 °C18 August 1954	-8.8 °C13 January 1954	11.5 °C	1,921 mm	20	93
1953	31.9 °C30 July 1953	-6.3 °C31 January 1953	11.0 °C	2,588 mm	9	92
1952	30.5 °C19 August 1952	-10.5 °C10 January 1952	9.6 °C	2,217 mm	3	128
1951	33.4 °C19 August 1951	-9.9 °C16 January 1951	10.2 °C	1,783 mm	10	119
1950	34.0 °C19 August 1950	-11.2 °C5 January 1950	11.0 °C	1,759 mm	36	122
1949	32.8 °C15 August 1949	-8.7 °C27 December 1949	10.5 °C	1,951 mm	13	114
1948	32.1 °C9 September 1948	-9.3 °C1 February 1948	10.8 °C	1,853 mm	5	116
1947	31.1 °C18 July 1947	-10.2 °C17 January 1947	9.3 °C	2,178 mm	5	136
1946	31.9 °C28 July 1946	-8.9 °C17 March 1946	10.6 °C	2,052 mm	15	121
1945	31.3 °C2 August 1945	-11.5 °C22 February 1945	9.8 °C	2,703 mm	8	123
1944	30.7 °C22 August 1944	-11.4 °C7 January 1944	10.6 °C	2,105 mm	5	130
1943	31.2 °C29 August 1943	-11.0 °C30 December 1943	10.2 °C	1,690 mm	13	136
1942	32.5 °C1 September 1942	-12.9 °C15 February 1942	10.3 °C	1,723 mm	15	124
1941	33.8 °C24 August 1941	-10.8 °C12 February 1941	10.1 °C	1,839 mm	5	126
1940	31.1 °C14 July 1940	-10.1 °C17 January 1940	9.8 °C	2,035 mm	4	129

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

17.0 °C

+1.4 °C

Hot days (≥ 30 °C)

52 d/yr

+31

Frost days (< 0 °C)

85 d/yr

-12

Annual rainfall

2318 mm

+110 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.9 °C	+0.5 °C	236 mm	+42 mm
Feb	2.6 °C	-0.4 °C	182 mm	+32 mm
Mar	8.2 °C	+1.3 °C	138 mm	-14 mm
Apr	14.9 °C	+0.6 °C	163 mm	+34 mm
May	20.5 °C	+0.3 °C	189 mm	+49 mm
Jun	26.2 °C	+2.4 °C	146 mm	-43 mm
Jul	32.1 °C	+4.9 °C	23 mm	-282 mm
Aug	30.1 °C	+1.3 °C	324 mm	+103 mm
Sep	26.9 °C	+2.5 °C	255 mm	+63 mm
Oct	18.9 °C	+0.7 °C	222 mm	+60 mm
Nov	12.7 °C	+0.7 °C	202 mm	+36 mm
Dec	7.5 °C	+2.0 °C	238 mm	+30 mm

The year's extremes

Hottest day

36.2 °C

30 Jul 2025

Coldest day

-5.8 °C

19 Jan 2025

Wettest day

65.9 mm

12 Aug 2025

Windiest day

30.0 km/h

14 Dec 2025

Strongest gust

89.6 km/h

14 Dec 2025

Hottest feels-like

41.9 °C

25 Aug 2025

Coldest feels-like

-10.4 °C

19 Jan 2025

Snowiest day

15.5 cm

15 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 Suibara?

Suibara has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 2,208 mm of precipitation per year.

What is the hottest day ever recorded in Suibara?

The hottest day measured in Suibara between 1940 and 2025 was 23 August 2023, reaching 37.1 °C.

What is the coldest day in Suibara?

The coldest day measured in Suibara between 1940 and 2025 was 15 February 1942, at -12.9 °C.

Does it snow in Suibara?

Yes. Suibara gets on average 298.6 cm of snow per year and has around 97 frost days.

Has the climate of Suibara warmed?

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

What is the wettest day in Suibara?

The wettest day measured in Suibara between 1940 and 2025 was 26 June 1978, with 164 mm of rain in 24 hours.

What was the windiest day in Suibara?

The windiest day measured in Suibara between 1940 and 2025 was 19 January 2021, with winds reaching 46.2 km/h.

What is the warmest month in Suibara?

The warmest month in Suibara is August (24.7 °C on average); the coldest is January (-0.3 °C).

How much does it rain in Suibara?

Suibara receives on average 2,208 mm of precipitation per year, spread over about 233 rainy days.

Is it sunny in Suibara?

Suibara 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 Suibara?

The heaviest 24-hour snowfall measured in Suibara between 1940 and 2025 was 15 February 2014, with 28.7 cm.

Are there tropical nights in Suibara?

Yes: Suibara has on average 48 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Suibara?

In Suibara, between 1940 and 2025, the highest apparent temperature reached 43.1 °C on 28 August 2020, and the lowest was -17.9 °C on 15 February 1942.

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