Shonai climate — normals and trends

Q: What is the climate of Shonai?

Shonai has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.8 °C and it receives 2,034 mm of precipitation per year.

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

The hottest day measured in Shonai between 1940 and 2025 was 23 August 2018, reaching 36.1 °C.

Q: What is the coldest day in Shonai?

The coldest day measured in Shonai between 1940 and 2025 was 12 February 1942, at -14.0 °C.

Q: Does it snow in Shonai?

Yes. Shonai gets on average 325.0 cm of snow per year and has around 91 frost days.

Q: Has the climate of Shonai warmed?

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

Q: What is the wettest day in Shonai?

The wettest day measured in Shonai between 1940 and 2025 was 8 July 1957, with 154 mm of rain in 24 hours.

Q: What was the windiest day in Shonai?

The windiest day measured in Shonai between 1940 and 2025 was 4 April 2012, with winds reaching 53.9 km/h.

Q: What is the warmest month in Shonai?

The warmest month in Shonai is August (23.8 °C on average); the coldest is January (-0.5 °C).

Q: How much does it rain in Shonai?

Shonai receives on average 2,034 mm of precipitation per year, spread over about 230 rainy days.

Q: Is it sunny in Shonai?

Shonai gets on average 7.9 hours of sunshine per day, roughly 2,884 hours per year over 1940-2025.

Shonai (Japan) has a hot-summer humid continental climate (Dfa) under the Köppen-Geiger classification. Its mean annual temperature is 10.8 °C and it receives 2,034 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 (23.8 °C on average) and the coldest is January (-0.5 °C). Rainfall peaks in July.

Shonai averages 91 frost days, 10 hot days (≥ 30 °C) and 230 rainy days per year.

Shonai 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 114 to 68 per year over the period.

The hottest day of the period reached 36.1 °C (on 23 August 2018) and the coldest -14.0 °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

ShonaiYamagata

coords: 38.85°, 139.90°
period: 1940–2025 · 86 yrs

DfaHot-summer humid continentalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthApril

Mean daily temperature

10.8°C

Average daily high

14.1°C

Average daily low

7.7°C

Annual rainfall

2,034mm

Sunshine / day

7.9h

Mean relative humidity

80%

Average peak wind

14.9km/h

Seasonal range

24.3°C

Frost days (< 0 °C)

91 d/yr

Hot days (≥ 30 °C)

10 d/yr

Rainy days (≥ 1 mm)

230 d/yr

Annual snowfall

325.0 cm

Average feels-like high

13.2 °C

Average feels-like low

5.9 °C

Average peak gust

42.5 km/h

Tropical nights (≥ 20 °C)

40 d/yr

Solar radiation

13.1 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

36.1 °C

23 August 2018

Coldest day

-14.0 °C

12 February 1942

Wettest day

154 mm

8 July 1957

Windiest day

53.9 km/h

4 April 2012

Strongest gust

155.9 km/h

4 April 2012

Hottest feels-like

41.7 °C

23 August 2018

Coldest feels-like

-18.6 °C

12 February 1942

Snowiest day

25.6 cm

27 January 2002

Sunniest day

14.3 h

19 June 2007

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.9 °C3 August 2025	-5.6 °C27 January 2025	12.5 °C	2,315 mm	39	78
2024	33.3 °C23 August 2024	-7.6 °C25 February 2024	13.1 °C	2,289 mm	22	65
2023	34.9 °C23 August 2023	-8.1 °C30 January 2023	13.2 °C	2,101 mm	45	60
2022	32.7 °C1 August 2022	-5.6 °C1 January 2022	12.1 °C	2,244 mm	12	78
2021	33.7 °C3 August 2021	-10.0 °C28 February 2021	12.3 °C	2,176 mm	20	74
2020	34.0 °C3 September 2020	-5.9 °C12 February 2020	12.5 °C	2,451 mm	19	43
2019	34.6 °C15 August 2019	-5.9 °C10 February 2019	12.3 °C	1,970 mm	23	70
2018	36.1 °C23 August 2018	-9.6 °C2 February 2018	12.1 °C	2,209 mm	25	79
2017	32.5 °C10 July 2017	-8.1 °C15 January 2017	11.5 °C	2,160 mm	10	79
2016	33.6 °C7 August 2016	-7.2 °C12 February 2016	12.1 °C	1,762 mm	18	71
2015	35.2 °C13 July 2015	-5.0 °C26 February 2015	12.3 °C	1,675 mm	17	60
2014	33.5 °C26 July 2014	-8.0 °C12 February 2014	11.4 °C	2,099 mm	7	84
2013	32.2 °C17 August 2013	-6.7 °C12 March 2013	11.4 °C	2,290 mm	6	87
2012	33.5 °C31 August 2012	-7.6 °C25 December 2012	11.3 °C	1,836 mm	34	106
2011	31.9 °C9 July 2011	-8.1 °C16 January 2011	11.2 °C	2,169 mm	19	109
2010	32.8 °C5 August 2010	-9.4 °C22 February 2010	11.9 °C	2,084 mm	23	85
2009	31.0 °C15 July 2009	-7.9 °C28 January 2009	11.6 °C	1,847 mm	1	75
2008	32.2 °C3 August 2008	-7.6 °C3 February 2008	11.6 °C	1,555 mm	5	82
2007	34.6 °C12 August 2007	-7.7 °C21 January 2007	11.8 °C	1,854 mm	13	71
2006	32.6 °C8 August 2006	-9.0 °C10 January 2006	11.3 °C	1,968 mm	8	81
2005	33.2 °C6 August 2005	-7.1 °C8 February 2005	11.1 °C	2,159 mm	9	99
2004	33.8 °C31 July 2004	-8.3 °C10 January 2004	12.1 °C	2,151 mm	16	73
2003	29.7 °C13 September 2003	-9.3 °C3 January 2003	11.2 °C	1,923 mm	0	79
2002	32.0 °C26 July 2002	-8.9 °C20 January 2002	11.4 °C	2,209 mm	12	67
2001	30.9 °C15 July 2001	-7.5 °C15 February 2001	11.2 °C	1,921 mm	2	88
2000	33.4 °C31 July 2000	-11.1 °C27 January 2000	11.6 °C	2,033 mm	14	81
1999	34.1 °C27 July 1999	-7.3 °C4 February 1999	11.8 °C	2,043 mm	21	86
1998	30.9 °C27 July 1998	-7.6 °C11 March 1998	11.8 °C	2,191 mm	3	83
1997	32.4 °C9 August 1997	-6.1 °C22 January 1997	11.3 °C	2,117 mm	6	79
1996	31.8 °C14 August 1996	-7.7 °C17 February 1996	10.4 °C	2,073 mm	3	89
1995	32.6 °C24 July 1995	-8.3 °C17 January 1995	11.1 °C	2,155 mm	7	82
1994	34.3 °C13 August 1994	-5.8 °C14 January 1994	11.9 °C	1,563 mm	28	78
1993	30.0 °C25 August 1993	-6.8 °C20 December 1993	10.7 °C	2,224 mm	1	62
1992	31.8 °C25 August 1992	-5.0 °C6 December 1992	11.3 °C	1,773 mm	6	68
1991	31.3 °C30 August 1991	-5.7 °C20 February 1991	11.5 °C	2,181 mm	5	79
1990	34.3 °C22 August 1990	-9.5 °C23 January 1990	12.4 °C	1,868 mm	11	50
1989	32.1 °C21 August 1989	-7.0 °C18 January 1989	11.7 °C	1,788 mm	13	61
1988	31.2 °C24 August 1988	-7.6 °C20 January 1988	10.4 °C	1,883 mm	3	98
1987	31.8 °C31 August 1987	-6.6 °C2 February 1987	11.3 °C	1,802 mm	6	96
1986	31.7 °C1 August 1986	-7.3 °C22 January 1986	10.4 °C	1,737 mm	8	87
1985	33.2 °C5 August 1985	-8.5 °C16 December 1985	10.9 °C	1,830 mm	25	106
1984	33.8 °C15 August 1984	-9.0 °C6 February 1984	10.3 °C	1,783 mm	23	115
1983	30.8 °C6 August 1983	-9.2 °C31 December 1983	10.9 °C	2,065 mm	5	98
1982	31.2 °C2 August 1982	-6.3 °C2 February 1982	11.2 °C	1,805 mm	5	87
1981	31.6 °C31 July 1981	-6.9 °C15 January 1981	10.2 °C	2,067 mm	5	97
1980	30.4 °C11 September 1980	-5.8 °C8 January 1980	10.4 °C	2,123 mm	1	94
1979	31.5 °C27 August 1979	-7.9 °C13 March 1979	11.3 °C	2,405 mm	6	91
1978	34.5 °C3 August 1978	-9.4 °C17 February 1978	10.9 °C	2,054 mm	16	86
1977	31.3 °C4 August 1977	-7.9 °C19 January 1977	10.6 °C	2,034 mm	3	86
1976	32.8 °C25 July 1976	-10.0 °C14 February 1976	9.9 °C	2,373 mm	2	105
1975	32.1 °C18 August 1975	-8.1 °C6 January 1975	10.9 °C	1,931 mm	10	94
1974	30.4 °C25 August 1974	-6.8 °C27 February 1974	10.1 °C	2,154 mm	1	104
1973	31.4 °C18 August 1973	-7.7 °C16 March 1973	10.8 °C	2,134 mm	8	96
1972	31.6 °C6 August 1972	-9.0 °C26 February 1972	11.2 °C	2,515 mm	6	84
1971	33.5 °C6 August 1971	-8.2 °C26 February 1971	10.3 °C	2,194 mm	8	96
1970	31.8 °C28 July 1970	-9.2 °C26 December 1970	10.3 °C	1,787 mm	14	117
1969	31.5 °C3 August 1969	-8.2 °C25 February 1969	10.2 °C	2,248 mm	2	112
1968	31.3 °C26 July 1968	-6.8 °C23 December 1968	10.9 °C	2,005 mm	2	84
1967	31.1 °C22 August 1967	-10.2 °C11 February 1967	10.8 °C	2,166 mm	7	101
1966	29.8 °C17 August 1966	-11.0 °C13 January 1966	9.8 °C	2,394 mm	0	127
1965	31.1 °C6 August 1965	-10.9 °C28 December 1965	9.5 °C	2,121 mm	2	122
1964	31.4 °C11 August 1964	-5.6 °C6 January 1964	10.8 °C	2,369 mm	10	83
1963	32.2 °C10 August 1963	-6.6 °C2 January 1963	10.9 °C	2,270 mm	6	87
1962	33.4 °C3 August 1962	-9.7 °C29 December 1962	11.1 °C	2,010 mm	15	86
1961	32.6 °C29 July 1961	-8.1 °C18 January 1961	11.4 °C	2,293 mm	14	90
1960	31.7 °C9 August 1960	-6.4 °C11 February 1960	11.0 °C	2,101 mm	8	86
1959	30.0 °C8 July 1959	-8.0 °C8 February 1959	11.5 °C	2,320 mm	1	81
1958	30.4 °C3 August 1958	-6.1 °C2 February 1958	10.9 °C	2,539 mm	1	75
1957	32.3 °C21 August 1957	-6.8 °C23 February 1957	10.5 °C	2,098 mm	4	95
1956	31.2 °C10 September 1956	-6.3 °C24 February 1956	10.4 °C	2,315 mm	5	98
1955	32.1 °C14 July 1955	-7.0 °C26 February 1955	11.2 °C	2,105 mm	19	92
1954	31.8 °C16 August 1954	-8.3 °C7 March 1954	10.7 °C	1,841 mm	10	90
1953	30.9 °C30 July 1953	-5.5 °C1 February 1953	10.3 °C	2,139 mm	3	86
1952	28.3 °C1 September 1952	-9.6 °C6 December 1952	8.8 °C	2,049 mm	0	134
1951	32.6 °C18 August 1951	-9.0 °C16 January 1951	9.5 °C	1,671 mm	5	115
1950	33.1 °C20 August 1950	-10.9 °C6 January 1950	10.2 °C	1,664 mm	17	119
1949	30.7 °C30 August 1949	-8.6 °C7 March 1949	9.8 °C	1,682 mm	7	111
1948	29.6 °C9 September 1948	-7.8 °C21 February 1948	10.2 °C	1,702 mm	0	110
1947	29.9 °C18 July 1947	-9.3 °C29 January 1947	8.6 °C	2,274 mm	0	131
1946	30.7 °C16 August 1946	-9.6 °C17 March 1946	9.9 °C	1,776 mm	5	119
1945	30.2 °C2 August 1945	-10.0 °C22 February 1945	9.1 °C	2,329 mm	2	125
1944	29.3 °C16 August 1944	-10.2 °C4 February 1944	9.8 °C	1,633 mm	0	124
1943	30.3 °C22 July 1943	-10.3 °C21 February 1943	9.6 °C	1,385 mm	4	128
1942	31.4 °C15 August 1942	-14.0 °C12 February 1942	9.5 °C	1,715 mm	1	118
1941	31.2 °C24 August 1941	-9.6 °C2 February 1941	9.1 °C	1,736 mm	1	128
1940	29.6 °C25 August 1940	-11.5 °C17 December 1940	9.1 °C	1,894 mm	0	124

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

16.1 °C

+2.0 °C

Hot days (≥ 30 °C)

39 d/yr

+29

Frost days (< 0 °C)

78 d/yr

-13

Annual rainfall

2315 mm

+281 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	2.7 °C	+1.1 °C	208 mm	+24 mm
Feb	2.4 °C	+0.4 °C	171 mm	+28 mm
Mar	7.4 °C	+2.0 °C	116 mm	-26 mm
Apr	13.5 °C	+1.2 °C	175 mm	+58 mm
May	19.2 °C	+0.8 °C	167 mm	+48 mm
Jun	25.3 °C	+3.3 °C	126 mm	-23 mm
Jul	30.6 °C	+5.1 °C	52 mm	-187 mm
Aug	29.5 °C	+2.2 °C	384 mm	+185 mm
Sep	25.6 °C	+2.6 °C	251 mm	+58 mm
Oct	17.9 °C	+0.9 °C	221 mm	+54 mm
Nov	11.7 °C	+1.0 °C	207 mm	+31 mm
Dec	5.9 °C	+1.4 °C	238 mm	+31 mm

The year's extremes

Hottest day

34.9 °C

3 Aug 2025

Coldest day

-5.6 °C

27 Jan 2025

Wettest day

105.2 mm

6 Aug 2025

Windiest day

47.7 km/h

14 Dec 2025

Strongest gust

104.0 km/h

15 Dec 2025

Hottest feels-like

40.6 °C

30 Jul 2025

Coldest feels-like

-10.3 °C

26 Dec 2025

Snowiest day

16.2 cm

31 Dec 2025

Sunniest day

14.2 h

19 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 Shonai?

Shonai has a hot-summer humid continental climate (Köppen Dfa). Over 1940-2025, the average annual temperature is 10.8 °C and it receives 2,034 mm of precipitation per year.

What is the hottest day ever recorded in Shonai?

The hottest day measured in Shonai between 1940 and 2025 was 23 August 2018, reaching 36.1 °C.

What is the coldest day in Shonai?

The coldest day measured in Shonai between 1940 and 2025 was 12 February 1942, at -14.0 °C.

Does it snow in Shonai?

Yes. Shonai gets on average 325.0 cm of snow per year and has around 91 frost days.

Has the climate of Shonai warmed?

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

What is the wettest day in Shonai?

The wettest day measured in Shonai between 1940 and 2025 was 8 July 1957, with 154 mm of rain in 24 hours.

What was the windiest day in Shonai?

The windiest day measured in Shonai between 1940 and 2025 was 4 April 2012, with winds reaching 53.9 km/h.

What is the warmest month in Shonai?

The warmest month in Shonai is August (23.8 °C on average); the coldest is January (-0.5 °C).

How much does it rain in Shonai?

Shonai receives on average 2,034 mm of precipitation per year, spread over about 230 rainy days.

Is it sunny in Shonai?

Shonai gets on average 7.9 hours of sunshine per day, roughly 2,884 hours per year over 1940-2025.

What is the biggest single-day snowfall in Shonai?

The heaviest 24-hour snowfall measured in Shonai between 1940 and 2025 was 27 January 2002, with 25.6 cm.

Are there tropical nights in Shonai?

Yes: Shonai has on average 40 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Shonai?

In Shonai, between 1940 and 2025, the highest apparent temperature reached 41.7 °C on 23 August 2018, and the lowest was -18.6 °C on 12 February 1942.

Compare Shonai with another city

Pick a second city: its normals will be set against these, indicator by indicator.

Nearby cities

The climate around Shonai

Other cities — Japan

All cities in Japan →