Aso climate — normals and trends

Q: What is the climate of Aso?

Aso has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.6 °C and it receives 1,877 mm of precipitation per year.

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

The hottest day measured in Aso between 1940 and 2025 was 17 July 1994, reaching 35.5 °C.

Q: What is the coldest day in Aso?

The coldest day measured in Aso between 1940 and 2025 was 19 February 1977, at -22.6 °C.

Q: Does it snow in Aso?

Yes. Aso gets on average 20.2 cm of snow per year and has around 77 frost days.

Q: Has the climate of Aso warmed?

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

Q: What is the wettest day in Aso?

The wettest day measured in Aso between 1940 and 2025 was 24 June 2012, with 191 mm of rain in 24 hours.

Q: What was the windiest day in Aso?

The windiest day measured in Aso between 1940 and 2025 was 27 September 1991, with winds reaching 54.9 km/h.

Q: What is the warmest month in Aso?

The warmest month in Aso is August (24.9 °C on average); the coldest is January (2.1 °C).

Q: How much does it rain in Aso?

Aso receives on average 1,877 mm of precipitation per year, spread over about 152 rainy days.

Q: Is it sunny in Aso?

Aso gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

Aso (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.6 °C and it receives 1,877 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 (24.9 °C on average) and the coldest is January (2.1 °C). Rainfall peaks in June.

Aso averages 77 frost days, 25 hot days (≥ 30 °C) and 152 rainy days per year.

Aso 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 98 to 56 per year over the period.

The hottest day of the period reached 35.5 °C (on 17 July 1994) and the coldest -22.6 °C (on 19 February 1977).

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

AsoKumamoto

coords: 32.94°, 131.08°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJuneDriest monthDecember

Mean daily temperature

13.6°C

Average daily high

18.4°C

Average daily low

9.3°C

Annual rainfall

1,877mm

Sunshine / day

8.0h

Mean relative humidity

77%

Average peak wind

11.7km/h

Seasonal range

22.8°C

Frost days (< 0 °C)

77 d/yr

Hot days (≥ 30 °C)

25 d/yr

Rainy days (≥ 1 mm)

152 d/yr

Annual snowfall

20.2 cm

Average feels-like high

18.2 °C

Average feels-like low

8.4 °C

Average peak gust

36.8 km/h

Tropical nights (≥ 20 °C)

62 d/yr

Solar radiation

13.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.9 °C

since 1940

+0.3 °C per decade · r² = 0.75 · 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

35.5 °C

17 July 1994

Coldest day

-22.6 °C

19 February 1977

Wettest day

191 mm

24 June 2012

Windiest day

54.9 km/h

27 September 1991

Strongest gust

175.7 km/h

7 September 2004

Hottest feels-like

41.8 °C

3 August 2024

Coldest feels-like

-26.9 °C

19 February 1977

Snowiest day

29.6 cm

15 February 1968

Sunniest day

13.8 h

5 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.0 °C2 August 2025	-9.1 °C9 February 2025	14.7 °C	1,729 mm	61	83
2024	35.0 °C3 August 2024	-6.1 °C25 December 2024	15.9 °C	2,377 mm	70	53
2023	33.4 °C27 July 2023	-7.4 °C25 January 2023	15.3 °C	2,015 mm	42	56
2022	33.2 °C1 July 2022	-5.7 °C19 January 2022	15.0 °C	1,684 mm	41	67
2021	33.7 °C5 August 2021	-6.8 °C8 January 2021	15.2 °C	2,022 mm	26	49
2020	35.3 °C19 August 2020	-4.5 °C18 December 2020	14.8 °C	2,298 mm	31	57
2019	33.5 °C4 August 2019	-4.4 °C3 January 2019	15.1 °C	1,940 mm	28	51
2018	34.3 °C19 July 2018	-7.8 °C8 February 2018	14.8 °C	1,995 mm	52	63
2017	34.2 °C31 July 2017	-6.8 °C25 January 2017	14.3 °C	1,826 mm	40	74
2016	34.0 °C11 August 2016	-8.1 °C25 January 2016	15.3 °C	2,296 mm	46	58
2015	34.2 °C8 August 2015	-4.9 °C3 January 2015	14.7 °C	2,380 mm	22	51
2014	32.2 °C8 July 2014	-5.0 °C21 February 2014	14.2 °C	1,885 mm	11	64
2013	34.8 °C19 August 2013	-4.7 °C11 January 2013	14.7 °C	1,688 mm	44	62
2012	32.5 °C31 July 2012	-7.0 °C3 February 2012	14.1 °C	2,144 mm	32	65
2011	32.2 °C16 July 2011	-6.7 °C16 January 2011	14.4 °C	2,173 mm	39	75
2010	33.5 °C4 September 2010	-4.3 °C31 December 2010	14.8 °C	1,972 mm	48	56
2009	33.0 °C7 August 2009	-4.7 °C24 January 2009	14.8 °C	1,633 mm	24	50
2008	33.1 °C11 August 2008	-5.4 °C18 February 2008	14.5 °C	1,830 mm	38	62
2007	33.5 °C17 August 2007	-5.4 °C3 February 2007	15.1 °C	1,745 mm	40	43
2006	34.1 °C8 August 2006	-5.2 °C5 February 2006	14.6 °C	2,217 mm	37	57
2005	33.6 °C23 July 2005	-6.5 °C18 December 2005	14.1 °C	1,735 mm	31	80
2004	33.8 °C30 July 2004	-9.7 °C22 January 2004	14.9 °C	2,084 mm	37	56
2003	33.0 °C6 August 2003	-5.5 °C7 January 2003	14.7 °C	2,043 mm	22	57
2002	33.4 °C24 July 2002	-4.7 °C28 December 2002	14.8 °C	1,675 mm	35	47
2001	34.5 °C3 August 2001	-10.6 °C18 January 2001	14.4 °C	1,750 mm	38	67
2000	33.2 °C27 August 2000	-4.6 °C10 February 2000	14.4 °C	1,691 mm	31	63
1999	32.0 °C12 August 1999	-4.6 °C16 January 1999	14.5 °C	1,837 mm	16	64
1998	32.3 °C13 September 1998	-13.7 °C25 January 1998	15.4 °C	1,904 mm	47	49
1997	32.2 °C2 September 1997	-6.2 °C4 February 1997	14.3 °C	1,794 mm	27	65
1996	33.9 °C17 July 1996	-6.5 °C3 February 1996	13.8 °C	1,777 mm	29	84
1995	34.4 °C25 August 1995	-7.1 °C31 December 1995	13.5 °C	1,819 mm	34	73
1994	35.5 °C17 July 1994	-8.0 °C24 January 1994	14.7 °C	1,312 mm	63	76
1993	30.4 °C25 August 1993	-4.9 °C3 February 1993	13.4 °C	3,036 mm	5	77
1992	31.2 °C23 July 1992	-5.0 °C26 December 1992	14.1 °C	1,856 mm	22	58
1991	32.5 °C18 August 1991	-8.7 °C25 February 1991	14.3 °C	2,343 mm	22	68
1990	34.8 °C6 August 1990	-13.0 °C17 January 1990	14.8 °C	2,051 mm	53	49
1989	31.7 °C22 August 1989	-5.1 °C10 March 1989	14.2 °C	1,835 mm	23	63
1988	32.1 °C1 August 1988	-6.0 °C4 February 1988	13.5 °C	1,647 mm	16	78
1987	32.3 °C29 August 1987	-8.8 °C3 March 1987	14.0 °C	2,214 mm	17	68
1986	32.8 °C16 August 1986	-10.2 °C12 January 1986	13.3 °C	1,692 mm	22	84
1985	32.9 °C29 July 1985	-8.0 °C15 January 1985	13.9 °C	1,820 mm	35	74
1984	33.4 °C10 August 1984	-15.8 °C10 February 1984	13.2 °C	1,573 mm	25	93
1983	32.7 °C5 August 1983	-7.1 °C14 February 1983	13.9 °C	1,970 mm	14	80
1982	32.1 °C31 July 1982	-9.5 °C3 February 1982	13.6 °C	2,275 mm	12	78
1981	32.7 °C18 July 1981	-18.0 °C23 January 1981	12.5 °C	1,674 mm	22	101
1980	31.6 °C20 July 1980	-14.7 °C19 January 1980	12.4 °C	2,646 mm	2	100
1979	33.2 °C16 August 1979	-5.0 °C2 February 1979	13.6 °C	2,188 mm	22	74
1978	33.2 °C25 July 1978	-13.2 °C23 January 1978	13.5 °C	1,297 mm	38	89
1977	33.4 °C28 July 1977	-22.6 °C19 February 1977	13.3 °C	2,115 mm	19	87
1976	32.2 °C17 July 1976	-15.4 °C24 January 1976	12.8 °C	2,369 mm	10	95
1975	32.1 °C5 August 1975	-16.7 °C24 February 1975	13.5 °C	2,244 mm	21	85
1974	33.4 °C15 August 1974	-8.2 °C12 February 1974	13.0 °C	1,606 mm	18	98
1973	33.3 °C22 July 1973	-8.1 °C25 December 1973	13.3 °C	1,680 mm	23	86
1972	32.7 °C17 August 1972	-6.9 °C4 March 1972	13.4 °C	2,749 mm	15	78
1971	33.7 °C1 August 1971	-10.8 °C11 February 1971	13.3 °C	2,046 mm	16	83
1970	33.2 °C5 August 1970	-7.4 °C23 March 1970	13.1 °C	1,807 mm	28	95
1969	32.8 °C18 July 1969	-8.0 °C16 January 1969	13.4 °C	1,826 mm	35	81
1968	33.0 °C25 July 1968	-14.3 °C26 February 1968	12.9 °C	1,833 mm	19	86
1967	32.9 °C17 August 1967	-13.5 °C18 January 1967	13.5 °C	1,631 mm	48	90
1966	33.3 °C9 August 1966	-6.7 °C20 January 1966	12.8 °C	1,977 mm	15	86
1965	31.3 °C19 August 1965	-10.1 °C17 January 1965	11.9 °C	1,995 mm	9	99
1964	32.7 °C13 August 1964	-9.0 °C26 February 1964	13.8 °C	1,791 mm	24	84
1963	31.7 °C19 July 1963	-16.2 °C10 February 1963	12.7 °C	2,004 mm	12	99
1962	32.7 °C26 July 1962	-13.3 °C1 February 1962	12.8 °C	1,736 mm	16	99
1961	33.4 °C18 July 1961	-10.0 °C4 February 1961	14.0 °C	1,704 mm	41	86
1960	32.5 °C4 August 1960	-10.5 °C30 January 1960	13.5 °C	1,627 mm	33	89
1959	32.8 °C3 August 1959	-13.7 °C20 January 1959	13.8 °C	1,941 mm	15	57
1958	33.2 °C6 August 1958	-10.2 °C25 January 1958	13.6 °C	1,589 mm	23	79
1957	30.8 °C17 August 1957	-9.9 °C28 February 1957	12.7 °C	2,307 mm	4	84
1956	33.2 °C3 August 1956	-9.1 °C13 March 1956	12.7 °C	1,920 mm	28	105
1955	32.7 °C11 July 1955	-11.2 °C12 January 1955	13.3 °C	1,654 mm	22	90
1954	32.8 °C7 August 1954	-7.1 °C9 February 1954	13.5 °C	2,149 mm	19	79
1953	33.2 °C15 August 1953	-7.6 °C17 January 1953	13.1 °C	2,039 mm	19	91
1952	31.3 °C3 August 1952	-7.1 °C6 February 1952	12.8 °C	1,797 mm	8	83
1951	32.9 °C15 August 1951	-5.9 °C14 January 1951	12.7 °C	1,710 mm	17	82
1950	30.4 °C3 August 1950	-6.3 °C18 February 1950	12.8 °C	1,430 mm	2	84
1949	30.6 °C7 August 1949	-8.7 °C10 January 1949	12.4 °C	2,204 mm	2	73
1948	30.1 °C19 August 1948	-8.6 °C18 January 1948	12.9 °C	1,712 mm	2	75
1947	31.6 °C14 August 1947	-14.9 °C21 December 1947	11.3 °C	1,268 mm	4	103
1946	34.1 °C16 July 1946	-6.0 °C19 January 1946	12.8 °C	1,275 mm	17	95
1945	30.4 °C8 August 1945	-12.3 °C26 January 1945	11.8 °C	2,215 mm	2	100
1944	30.7 °C1 September 1944	-6.0 °C8 January 1944	12.5 °C	1,312 mm	2	108
1943	30.3 °C14 August 1943	-7.0 °C1 February 1943	12.2 °C	1,292 mm	2	101
1942	34.0 °C1 August 1942	-13.0 °C19 January 1942	12.6 °C	928 mm	28	96
1941	30.6 °C6 August 1941	-9.3 °C2 February 1941	12.4 °C	1,374 mm	4	90
1940	30.5 °C27 July 1940	-16.8 °C9 February 1940	11.8 °C	1,212 mm	3	102

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

19.9 °C

+1.5 °C

Hot days (≥ 30 °C)

61 d/yr

+36

Frost days (< 0 °C)

83 d/yr

Annual rainfall

1729 mm

-148 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	7.5 °C	+0.8 °C	23 mm	-40 mm
Feb	6.9 °C	-1.3 °C	58 mm	-34 mm
Mar	13.7 °C	+1.2 °C	164 mm	+30 mm
Apr	19.0 °C	+0.9 °C	109 mm	-50 mm
May	22.2 °C	+0.2 °C	303 mm	+111 mm
Jun	26.3 °C	+1.8 °C	391 mm	+24 mm
Jul	31.2 °C	+3.1 °C	74 mm	-223 mm
Aug	30.4 °C	+1.2 °C	272 mm	+94 mm
Sep	28.6 °C	+2.5 °C	178 mm	+11 mm
Oct	24.2 °C	+3.2 °C	78 mm	-17 mm
Nov	16.3 °C	+1.1 °C	30 mm	-43 mm
Dec	11.3 °C	+2.1 °C	49 mm	-10 mm

The year's extremes

Hottest day

35.0 °C

2 Aug 2025

Coldest day

-9.1 °C

9 Feb 2025

Wettest day

67.4 mm

21 May 2025

Windiest day

29.9 km/h

16 Jun 2025

Strongest gust

89.3 km/h

16 Jun 2025

Hottest feels-like

41.2 °C

2 Aug 2025

Coldest feels-like

-12.7 °C

9 Feb 2025

Snowiest day

1.8 cm

5 Feb 2025

Sunniest day

13.8 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 Aso?

Aso has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.6 °C and it receives 1,877 mm of precipitation per year.

What is the hottest day ever recorded in Aso?

The hottest day measured in Aso between 1940 and 2025 was 17 July 1994, reaching 35.5 °C.

What is the coldest day in Aso?

The coldest day measured in Aso between 1940 and 2025 was 19 February 1977, at -22.6 °C.

Does it snow in Aso?

Yes. Aso gets on average 20.2 cm of snow per year and has around 77 frost days.

Has the climate of Aso warmed?

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

What is the wettest day in Aso?

The wettest day measured in Aso between 1940 and 2025 was 24 June 2012, with 191 mm of rain in 24 hours.

What was the windiest day in Aso?

The windiest day measured in Aso between 1940 and 2025 was 27 September 1991, with winds reaching 54.9 km/h.

What is the warmest month in Aso?

The warmest month in Aso is August (24.9 °C on average); the coldest is January (2.1 °C).

How much does it rain in Aso?

Aso receives on average 1,877 mm of precipitation per year, spread over about 152 rainy days.

Is it sunny in Aso?

Aso gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

What is the biggest single-day snowfall in Aso?

The heaviest 24-hour snowfall measured in Aso between 1940 and 2025 was 15 February 1968, with 29.6 cm.

Are there tropical nights in Aso?

Yes: Aso has on average 62 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Aso?

In Aso, between 1940 and 2025, the highest apparent temperature reached 41.8 °C on 3 August 2024, and the lowest was -26.9 °C on 19 February 1977.

Compare Aso with another city

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

Nearby cities

The climate around Aso

Other cities — Japan

All cities in Japan →