Ōtsu climate — normals and trends

Q: What is the climate of Ōtsu?

Ōtsu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,657 mm of precipitation per year.

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

The hottest day measured in Ōtsu between 1940 and 2025 was 7 August 1994, reaching 38.1 °C.

Q: What is the coldest day in Ōtsu?

The coldest day measured in Ōtsu between 1940 and 2025 was 16 February 1947, at -11.7 °C.

Q: Does it snow in Ōtsu?

Yes. Ōtsu gets on average 18.5 cm of snow per year and has around 63 frost days.

Q: Has the climate of Ōtsu warmed?

Yes: Ōtsu warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ōtsu?

The wettest day measured in Ōtsu between 1940 and 2025 was 25 September 1953, with 167 mm of rain in 24 hours.

Q: What was the windiest day in Ōtsu?

The windiest day measured in Ōtsu between 1940 and 2025 was 4 September 2018, with winds reaching 54.6 km/h.

Q: What is the warmest month in Ōtsu?

The warmest month in Ōtsu is August (26.1 °C on average); the coldest is January (2.6 °C).

Q: How much does it rain in Ōtsu?

Ōtsu receives on average 1,657 mm of precipitation per year, spread over about 143 rainy days.

Q: Is it sunny in Ōtsu?

Ōtsu gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.

Ōtsu (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.0 °C and it receives 1,657 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 (26.1 °C on average) and the coldest is January (2.6 °C). Rainfall peaks in July.

Ōtsu averages 63 frost days, 38 hot days (≥ 30 °C) and 143 rainy days per year.

Ōtsu has warmed by +2.9 °C between 1940 and 2025, or +0.34 °C per decade. This trend is statistically significant.

The number of frost days there went from about 88 to 38 per year over the period.

The hottest day of the period reached 38.1 °C (on 7 August 1994) and the coldest -11.7 °C (on 16 February 1947).

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

ŌtsuShiga

coords: 35.00°, 135.87°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthJanuary

Mean daily temperature

14.0°C

Average daily high

18.5°C

Average daily low

10.0°C

Annual rainfall

1,657mm

Sunshine / day

8.6h

Mean relative humidity

76%

Average peak wind

14.3km/h

Seasonal range

23.5°C

Frost days (< 0 °C)

63 d/yr

Hot days (≥ 30 °C)

38 d/yr

Rainy days (≥ 1 mm)

143 d/yr

Annual snowfall

18.5 cm

Average feels-like high

18.0 °C

Average feels-like low

9.1 °C

Average peak gust

38.2 km/h

Tropical nights (≥ 20 °C)

69 d/yr

Solar radiation

14.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.9 °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

7 August 1994

Coldest day

-11.7 °C

16 February 1947

Wettest day

167 mm

25 September 1953

Windiest day

54.6 km/h

4 September 2018

Strongest gust

181.8 km/h

26 September 1959

Hottest feels-like

44.2 °C

8 August 1994

Coldest feels-like

-16.5 °C

16 February 1947

Snowiest day

29.3 cm

15 February 1968

Sunniest day

14.0 h

13 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.6 °C30 July 2025	-4.4 °C9 February 2025	15.6 °C	1,477 mm	83	54
2024	36.1 °C29 July 2024	-6.0 °C25 January 2024	16.2 °C	1,987 mm	77	31
2023	35.8 °C27 July 2023	-10.7 °C26 January 2023	16.0 °C	1,608 mm	76	34
2022	35.3 °C3 August 2022	-6.6 °C6 February 2022	15.4 °C	1,505 mm	60	53
2021	35.9 °C5 August 2021	-8.6 °C27 December 2021	15.5 °C	1,914 mm	34	39
2020	35.4 °C16 August 2020	-5.5 °C31 December 2020	15.6 °C	1,802 mm	49	24
2019	35.7 °C2 August 2019	-2.7 °C10 January 2019	15.6 °C	1,485 mm	48	32
2018	36.6 °C18 July 2018	-6.2 °C28 January 2018	15.5 °C	1,831 mm	59	52
2017	35.2 °C6 August 2017	-7.7 °C13 February 2017	14.7 °C	1,704 mm	54	55
2016	34.4 °C6 August 2016	-7.6 °C26 January 2016	15.6 °C	1,791 mm	55	38
2015	35.5 °C31 July 2015	-3.6 °C2 January 2015	15.2 °C	1,962 mm	35	32
2014	36.1 °C25 July 2014	-2.6 °C7 January 2014	14.6 °C	1,634 mm	35	51
2013	34.9 °C10 August 2013	-4.1 °C19 January 2013	14.9 °C	1,705 mm	56	48
2012	35.1 °C17 August 2012	-9.4 °C19 February 2012	14.3 °C	1,626 mm	52	62
2011	34.4 °C9 August 2011	-5.1 °C18 January 2011	14.7 °C	1,978 mm	52	70
2010	35.5 °C22 July 2010	-3.4 °C15 January 2010	15.2 °C	1,715 mm	66	35
2009	32.9 °C8 August 2009	-4.0 °C15 January 2009	14.9 °C	1,560 mm	30	38
2008	36.1 °C26 July 2008	-5.4 °C18 February 2008	14.9 °C	1,438 mm	50	48
2007	35.4 °C16 August 2007	-4.8 °C5 February 2007	15.1 °C	1,343 mm	46	34
2006	34.5 °C10 August 2006	-5.6 °C9 January 2006	14.6 °C	1,692 mm	40	44
2005	35.0 °C5 August 2005	-5.4 °C2 January 2005	14.6 °C	1,034 mm	60	65
2004	34.1 °C27 July 2004	-5.8 °C18 January 2004	15.4 °C	1,809 mm	59	47
2003	33.7 °C5 August 2003	-5.4 °C7 January 2003	14.4 °C	1,896 mm	32	56
2002	35.2 °C23 July 2002	-7.7 °C12 February 2002	14.8 °C	1,319 mm	60	44
2001	36.5 °C1 August 2001	-5.3 °C29 January 2001	14.5 °C	1,403 mm	50	67
2000	35.3 °C25 August 2000	-3.8 °C1 March 2000	14.6 °C	1,535 mm	61	66
1999	33.1 °C25 July 1999	-5.8 °C12 February 1999	14.7 °C	1,485 mm	32	59
1998	34.3 °C3 August 1998	-3.3 °C25 January 1998	15.4 °C	1,852 mm	46	37
1997	33.1 °C2 September 1997	-4.7 °C22 January 1997	14.3 °C	1,623 mm	35	62
1996	35.0 °C2 August 1996	-4.5 °C11 February 1996	13.9 °C	1,480 mm	42	76
1995	34.8 °C24 August 1995	-5.0 °C28 December 1995	13.9 °C	1,644 mm	43	75
1994	38.1 °C7 August 1994	-5.0 °C18 February 1994	15.5 °C	974 mm	70	46
1993	32.7 °C26 August 1993	-3.4 °C15 February 1993	13.9 °C	2,069 mm	13	44
1992	33.3 °C27 July 1992	-3.6 °C16 January 1992	14.4 °C	1,457 mm	36	35
1991	33.7 °C2 August 1991	-4.1 °C24 February 1991	14.7 °C	1,881 mm	37	43
1990	35.4 °C31 August 1990	-6.2 °C3 February 1990	15.3 °C	1,734 mm	64	34
1989	32.0 °C22 August 1989	-3.3 °C6 January 1989	14.4 °C	1,808 mm	26	34
1988	32.2 °C7 August 1988	-4.2 °C20 February 1988	13.6 °C	1,726 mm	18	63
1987	34.3 °C6 June 1987	-6.8 °C14 January 1987	14.5 °C	1,359 mm	45	51
1986	33.6 °C30 July 1986	-5.5 °C3 March 1986	13.6 °C	1,576 mm	43	72
1985	34.5 °C30 July 1985	-6.0 °C31 January 1985	14.1 °C	1,779 mm	47	60
1984	33.8 °C12 August 1984	-11.2 °C9 February 1984	13.3 °C	1,229 mm	44	88
1983	34.1 °C4 August 1983	-4.2 °C9 March 1983	14.1 °C	1,612 mm	36	68
1982	32.1 °C7 August 1982	-5.4 °C31 January 1982	13.9 °C	1,877 mm	18	57
1981	33.8 °C18 July 1981	-7.1 °C27 January 1981	13.2 °C	1,510 mm	34	79
1980	32.7 °C21 July 1980	-9.0 °C23 January 1980	13.2 °C	2,125 mm	6	86
1979	33.2 °C31 July 1979	-4.9 °C2 January 1979	14.3 °C	1,798 mm	30	63
1978	35.1 °C12 August 1978	-7.9 °C3 February 1978	14.1 °C	1,416 mm	63	66
1977	33.7 °C4 August 1977	-7.9 °C12 February 1977	14.2 °C	1,771 mm	31	72
1976	33.7 °C22 August 1976	-4.1 °C27 December 1976	13.4 °C	1,989 mm	19	70
1975	33.9 °C28 July 1975	-8.2 °C23 February 1975	14.0 °C	2,127 mm	35	79
1974	32.0 °C5 August 1974	-8.9 °C12 February 1974	13.4 °C	2,027 mm	27	71
1973	34.9 °C12 August 1973	-4.2 °C25 December 1973	13.8 °C	1,513 mm	48	71
1972	34.4 °C31 July 1972	-3.4 °C18 January 1972	14.0 °C	2,480 mm	30	47
1971	33.2 °C31 July 1971	-5.3 °C8 February 1971	13.4 °C	2,062 mm	30	64
1970	34.6 °C22 July 1970	-5.8 °C20 January 1970	13.3 °C	1,934 mm	38	86
1969	33.7 °C13 August 1969	-6.3 °C14 March 1969	13.4 °C	1,808 mm	40	77
1968	33.0 °C23 July 1968	-11.7 °C21 February 1968	13.3 °C	1,930 mm	20	71
1967	33.0 °C1 August 1967	-6.5 °C17 January 1967	13.7 °C	1,655 mm	48	81
1966	32.8 °C9 August 1966	-5.9 °C21 January 1966	12.7 °C	1,907 mm	19	89
1965	31.4 °C21 August 1965	-7.4 °C31 January 1965	12.1 °C	1,873 mm	15	104
1964	34.4 °C14 August 1964	-4.9 °C27 February 1964	14.5 °C	1,650 mm	52	56
1963	33.4 °C18 July 1963	-5.3 °C24 January 1963	13.7 °C	1,761 mm	41	79
1962	34.4 °C22 July 1962	-6.5 °C27 January 1962	13.8 °C	1,633 mm	38	70
1961	33.8 °C13 August 1961	-5.4 °C2 February 1961	14.7 °C	1,802 mm	62	72
1960	34.6 °C1 August 1960	-5.2 °C27 January 1960	14.2 °C	1,668 mm	36	56
1959	35.4 °C2 August 1959	-4.6 °C18 January 1959	14.7 °C	1,995 mm	46	46
1958	33.6 °C31 July 1958	-4.6 °C4 January 1958	14.2 °C	1,604 mm	29	51
1957	33.4 °C1 August 1957	-4.9 °C9 January 1957	13.5 °C	1,885 mm	23	70
1956	35.0 °C2 August 1956	-7.1 °C13 March 1956	13.5 °C	1,938 mm	40	76
1955	34.0 °C22 July 1955	-7.1 °C13 January 1955	14.3 °C	1,474 mm	47	54
1954	34.3 °C13 August 1954	-4.8 °C23 February 1954	14.0 °C	1,686 mm	32	49
1953	34.3 °C20 August 1953	-7.0 °C23 February 1953	13.8 °C	2,083 mm	26	63
1952	31.9 °C27 August 1952	-6.8 °C16 January 1952	12.4 °C	1,684 mm	13	90
1951	32.7 °C27 July 1951	-5.7 °C17 February 1951	12.6 °C	1,543 mm	27	80
1950	30.7 °C23 July 1950	-4.7 °C29 December 1950	12.9 °C	1,294 mm	8	95
1949	32.3 °C6 August 1949	-4.4 °C17 January 1949	12.5 °C	1,520 mm	6	87
1948	30.4 °C19 August 1948	-4.4 °C3 January 1948	13.1 °C	1,443 mm	3	69
1947	33.0 °C13 August 1947	-11.7 °C16 February 1947	11.8 °C	1,187 mm	22	102
1946	33.4 °C16 July 1946	-7.0 °C12 March 1946	12.9 °C	1,165 mm	19	96
1945	31.2 °C9 August 1945	-8.1 °C27 February 1945	12.1 °C	1,889 mm	12	101
1944	31.4 °C30 August 1944	-5.2 °C9 January 1944	12.7 °C	1,197 mm	12	103
1943	31.5 °C10 August 1943	-6.0 °C30 January 1943	12.3 °C	935 mm	11	100
1942	33.9 °C4 August 1942	-9.6 °C14 February 1942	12.6 °C	906 mm	38	96
1941	31.0 °C18 August 1941	-7.8 °C12 February 1941	12.6 °C	1,566 mm	8	87
1940	30.5 °C24 July 1940	-11.6 °C10 February 1940	12.0 °C	1,146 mm	3	103

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

20.2 °C

+1.7 °C

Hot days (≥ 30 °C)

83 d/yr

+45

Frost days (< 0 °C)

54 d/yr

-9

Annual rainfall

1477 mm

-180 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	8.1 °C	+1.3 °C	27 mm	-28 mm
Feb	6.9 °C	-0.6 °C	46 mm	-25 mm
Mar	12.9 °C	+1.4 °C	121 mm	+9 mm
Apr	19.1 °C	+1.7 °C	92 mm	-47 mm
May	22.3 °C	+0.4 °C	193 mm	+36 mm
Jun	27.6 °C	+2.4 °C	218 mm	-15 mm
Jul	33.4 °C	+4.4 °C	84 mm	-175 mm
Aug	33.0 °C	+2.5 °C	184 mm	+24 mm
Sep	29.6 °C	+3.2 °C	204 mm	+7 mm
Oct	22.2 °C	+1.6 °C	218 mm	+79 mm
Nov	15.6 °C	+0.5 °C	34 mm	-47 mm
Dec	11.2 °C	+1.7 °C	58 mm	+2 mm

The year's extremes

Hottest day

36.6 °C

30 Jul 2025

Coldest day

-4.4 °C

9 Feb 2025

Wettest day

70.5 mm

11 Aug 2025

Windiest day

29.2 km/h

5 Feb 2025

Strongest gust

74.9 km/h

17 May 2025

Hottest feels-like

42.9 °C

30 Jul 2025

Coldest feels-like

-9.0 °C

8 Feb 2025

Snowiest day

2.9 cm

19 Mar 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 Ōtsu?

Ōtsu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.0 °C and it receives 1,657 mm of precipitation per year.

What is the hottest day ever recorded in Ōtsu?

The hottest day measured in Ōtsu between 1940 and 2025 was 7 August 1994, reaching 38.1 °C.

What is the coldest day in Ōtsu?

The coldest day measured in Ōtsu between 1940 and 2025 was 16 February 1947, at -11.7 °C.

Does it snow in Ōtsu?

Yes. Ōtsu gets on average 18.5 cm of snow per year and has around 63 frost days.

Has the climate of Ōtsu warmed?

Yes: Ōtsu warmed by +2.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ōtsu?

The wettest day measured in Ōtsu between 1940 and 2025 was 25 September 1953, with 167 mm of rain in 24 hours.

What was the windiest day in Ōtsu?

The windiest day measured in Ōtsu between 1940 and 2025 was 4 September 2018, with winds reaching 54.6 km/h.

What is the warmest month in Ōtsu?

The warmest month in Ōtsu is August (26.1 °C on average); the coldest is January (2.6 °C).

How much does it rain in Ōtsu?

Ōtsu receives on average 1,657 mm of precipitation per year, spread over about 143 rainy days.

Is it sunny in Ōtsu?

Ōtsu gets on average 8.6 hours of sunshine per day, roughly 3,139 hours per year over 1940-2025.

What is the biggest single-day snowfall in Ōtsu?

The heaviest 24-hour snowfall measured in Ōtsu between 1940 and 2025 was 15 February 1968, with 29.3 cm.

Are there tropical nights in Ōtsu?

Yes: Ōtsu has on average 69 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ōtsu?

In Ōtsu, between 1940 and 2025, the highest apparent temperature reached 44.2 °C on 8 August 1994, and the lowest was -16.5 °C on 16 February 1947.

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