Ageo climate — normals and trends

Q: What is the climate of Ageo?

Ageo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.9 °C and it receives 1,354 mm of precipitation per year.

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

The hottest day measured in Ageo between 1940 and 2025 was 5 August 2025, reaching 39.5 °C.

Q: What is the coldest day in Ageo?

The coldest day measured in Ageo between 1940 and 2025 was 16 February 1967, at -16.3 °C.

Q: Does it snow in Ageo?

Yes. Ageo gets on average 22.5 cm of snow per year and has around 49 frost days.

Q: Has the climate of Ageo warmed?

Yes: Ageo warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Ageo?

The wettest day measured in Ageo between 1940 and 2025 was 26 September 1958, with 254 mm of rain in 24 hours.

Q: What was the windiest day in Ageo?

The windiest day measured in Ageo between 1940 and 2025 was 25 September 1966, with winds reaching 71.2 km/h.

Q: What is the warmest month in Ageo?

The warmest month in Ageo is August (26.9 °C on average); the coldest is January (3.4 °C).

Q: How much does it rain in Ageo?

Ageo receives on average 1,354 mm of precipitation per year, spread over about 133 rainy days.

Q: Is it sunny in Ageo?

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

Ageo (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.9 °C and it receives 1,354 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 (26.9 °C on average) and the coldest is January (3.4 °C). Rainfall peaks in September.

Ageo averages 49 frost days, 42 hot days (≥ 30 °C) and 133 rainy days per year.

Ageo has warmed by +2.6 °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 73 to 25 per year over the period.

The hottest day of the period reached 39.5 °C (on 5 August 2025) and the coldest -16.3 °C (on 16 February 1967).

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

AgeoSaitama

coords: 35.97°, 139.61°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthSeptemberDriest monthJanuary

Mean daily temperature

14.9°C

Average daily high

19.2°C

Average daily low

11.1°C

Annual rainfall

1,354mm

Sunshine / day

8.1h

Mean relative humidity

72%

Average peak wind

15.0km/h

Seasonal range

23.5°C

Frost days (< 0 °C)

49 d/yr

Hot days (≥ 30 °C)

42 d/yr

Rainy days (≥ 1 mm)

133 d/yr

Annual snowfall

22.5 cm

Average feels-like high

18.8 °C

Average feels-like low

10.4 °C

Average peak gust

29.3 km/h

Tropical nights (≥ 20 °C)

80 d/yr

Solar radiation

13.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.6 °C

since 1940

+0.3 °C per decade · r² = 0.68 · 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

39.5 °C

5 August 2025

Coldest day

-16.3 °C

16 February 1967

Wettest day

254 mm

26 September 1958

Windiest day

71.2 km/h

25 September 1966

Strongest gust

146.5 km/h

27 September 1959

Hottest feels-like

45.7 °C

16 August 2007

Coldest feels-like

-20.9 °C

16 February 1967

Snowiest day

35.0 cm

12 March 1969

Sunniest day

14.0 h

25 June 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	39.5 °C5 August 2025	-3.8 °C5 January 2025	16.7 °C	1,027 mm	90	45
2024	38.3 °C11 August 2024	-3.5 °C12 January 2024	17.2 °C	1,468 mm	80	30
2023	37.9 °C30 July 2023	-4.7 °C26 January 2023	17.3 °C	1,145 mm	83	30
2022	38.5 °C30 June 2022	-3.8 °C7 January 2022	16.2 °C	1,318 mm	64	45
2021	36.3 °C10 August 2021	-4.5 °C10 January 2021	16.2 °C	1,566 mm	44	36
2020	37.2 °C11 August 2020	-4.7 °C7 February 2020	16.3 °C	1,488 mm	51	18
2019	36.1 °C9 September 2019	-3.4 °C10 January 2019	16.3 °C	1,512 mm	51	25
2018	39.1 °C23 July 2018	-5.6 °C24 January 2018	16.6 °C	1,199 mm	65	36
2017	36.3 °C17 July 2017	-3.1 °C16 January 2017	15.6 °C	1,386 mm	51	30
2016	36.7 °C9 August 2016	-6.3 °C20 January 2016	16.0 °C	1,481 mm	50	36
2015	37.7 °C7 August 2015	-4.0 °C31 January 2015	16.1 °C	1,456 mm	42	36
2014	38.0 °C5 August 2014	-4.5 °C19 February 2014	15.5 °C	1,363 mm	39	53
2013	37.9 °C10 August 2013	-6.4 °C17 January 2013	15.9 °C	1,177 mm	52	46
2012	35.5 °C30 August 2012	-4.8 °C27 January 2012	15.1 °C	1,362 mm	61	57
2011	36.4 °C18 August 2011	-4.3 °C31 January 2011	15.4 °C	1,264 mm	56	50
2010	36.2 °C23 July 2010	-3.1 °C14 January 2010	15.8 °C	1,704 mm	65	35
2009	34.0 °C13 July 2009	-3.3 °C25 January 2009	15.6 °C	1,589 mm	31	18
2008	36.3 °C15 August 2008	-2.8 °C4 February 2008	15.5 °C	1,440 mm	46	28
2007	38.4 °C16 August 2007	-3.2 °C25 February 2007	15.9 °C	1,379 mm	47	12
2006	35.5 °C5 August 2006	-4.3 °C5 February 2006	15.6 °C	1,555 mm	33	29
2005	35.4 °C5 August 2005	-6.6 °C2 January 2005	15.2 °C	1,203 mm	57	46
2004	38.4 °C20 July 2004	-3.1 °C23 January 2004	16.4 °C	1,523 mm	65	20
2003	33.8 °C23 August 2003	-5.3 °C22 December 2003	15.0 °C	1,586 mm	30	33
2002	37.3 °C11 August 2002	-2.9 °C4 January 2002	15.6 °C	1,364 mm	55	25
2001	38.3 °C24 July 2001	-12.0 °C30 January 2001	15.4 °C	1,208 mm	47	43
2000	37.0 °C2 September 2000	-2.9 °C28 January 2000	15.8 °C	1,314 mm	61	24
1999	34.8 °C30 July 1999	-3.1 °C14 February 1999	16.0 °C	1,270 mm	53	33
1998	35.1 °C3 July 1998	-10.5 °C10 January 1998	15.6 °C	1,707 mm	40	37
1997	37.5 °C5 July 1997	-5.5 °C10 January 1997	15.6 °C	1,125 mm	48	28
1996	38.3 °C15 August 1996	-9.1 °C20 February 1996	14.9 °C	1,264 mm	45	34
1995	37.7 °C19 August 1995	-4.6 °C6 March 1995	15.4 °C	1,157 mm	49	31
1994	38.5 °C3 August 1994	-11.7 °C31 January 1994	15.8 °C	1,325 mm	65	44
1993	32.9 °C16 June 1993	-2.3 °C3 March 1993	14.6 °C	1,707 mm	18	25
1992	35.8 °C4 September 1992	-4.8 °C3 February 1992	15.1 °C	1,387 mm	45	25
1991	36.4 °C24 July 1991	-6.6 °C31 December 1991	15.6 °C	1,748 mm	39	32
1990	38.1 °C7 August 1990	-9.9 °C3 February 1990	16.1 °C	1,483 mm	61	29
1989	33.2 °C28 August 1989	-3.4 °C29 January 1989	15.3 °C	1,412 mm	32	16
1988	33.0 °C31 July 1988	-3.8 °C4 February 1988	14.4 °C	1,501 mm	19	42
1987	36.7 °C24 July 1987	-7.4 °C14 January 1987	15.2 °C	1,136 mm	45	47
1986	33.9 °C4 September 1986	-10.2 °C26 February 1986	14.0 °C	1,466 mm	34	61
1985	34.4 °C2 September 1985	-9.7 °C31 January 1985	14.7 °C	1,515 mm	54	53
1984	37.6 °C3 September 1984	-13.2 °C9 February 1984	13.7 °C	937 mm	48	82
1983	35.6 °C19 August 1983	-5.8 °C20 February 1983	14.6 °C	1,352 mm	32	48
1982	32.6 °C22 August 1982	-7.7 °C21 January 1982	14.9 °C	1,474 mm	21	35
1981	34.2 °C18 July 1981	-11.8 °C18 February 1981	13.8 °C	1,331 mm	35	70
1980	32.6 °C23 July 1980	-9.0 °C25 March 1980	14.1 °C	1,497 mm	15	65
1979	34.6 °C25 June 1979	-12.0 °C16 January 1979	15.5 °C	1,594 mm	40	48
1978	37.5 °C22 August 1978	-9.6 °C4 January 1978	14.9 °C	1,187 mm	65	60
1977	34.0 °C5 August 1977	-11.2 °C14 January 1977	14.7 °C	1,482 mm	25	60
1976	33.2 °C22 August 1976	-6.7 °C28 December 1976	14.1 °C	1,522 mm	21	50
1975	34.8 °C5 August 1975	-6.6 °C23 February 1975	14.7 °C	1,508 mm	50	50
1974	32.9 °C30 July 1974	-9.1 °C27 January 1974	14.3 °C	1,514 mm	33	48
1973	37.2 °C19 August 1973	-2.9 °C9 February 1973	14.9 °C	1,203 mm	47	51
1972	35.4 °C8 August 1972	-4.7 °C8 February 1972	15.1 °C	1,672 mm	35	39
1971	34.1 °C8 July 1971	-5.7 °C6 January 1971	14.4 °C	1,595 mm	36	49
1970	34.5 °C23 July 1970	-9.7 °C6 January 1970	14.1 °C	1,271 mm	40	65
1969	35.1 °C30 July 1969	-7.0 °C1 March 1969	14.5 °C	1,346 mm	41	57
1968	33.7 °C21 July 1968	-12.9 °C25 February 1968	14.5 °C	1,369 mm	28	57
1967	36.5 °C11 August 1967	-16.3 °C16 February 1967	14.6 °C	1,295 mm	49	71
1966	33.1 °C7 August 1966	-5.6 °C21 January 1966	13.9 °C	1,546 mm	29	66
1965	33.5 °C30 July 1965	-8.3 °C31 January 1965	13.6 °C	1,438 mm	22	65
1964	34.8 °C17 August 1964	-4.1 °C14 February 1964	14.8 °C	1,491 mm	42	40
1963	36.1 °C13 August 1963	-6.7 °C5 February 1963	14.6 °C	1,220 mm	43	60
1962	37.0 °C9 August 1962	-3.6 °C27 January 1962	15.0 °C	1,300 mm	49	47
1961	35.9 °C26 July 1961	-4.6 °C3 February 1961	15.5 °C	1,162 mm	54	54
1960	34.2 °C8 August 1960	-7.3 °C18 January 1960	15.0 °C	1,275 mm	39	36
1959	34.3 °C1 August 1959	-7.6 °C6 January 1959	15.2 °C	1,622 mm	40	44
1958	35.8 °C1 August 1958	-9.6 °C30 March 1958	14.8 °C	1,618 mm	40	45
1957	33.9 °C28 July 1957	-8.3 °C12 February 1957	14.5 °C	1,426 mm	29	50
1956	36.2 °C2 August 1956	-11.7 °C26 January 1956	14.4 °C	1,356 mm	37	78
1955	36.6 °C31 July 1955	-4.8 °C17 January 1955	15.2 °C	1,240 mm	46	55
1954	36.3 °C23 August 1954	-12.8 °C27 January 1954	14.5 °C	1,322 mm	37	45
1953	36.5 °C21 August 1953	-10.8 °C23 February 1953	14.4 °C	1,450 mm	25	53
1952	33.3 °C26 August 1952	-14.6 °C6 February 1952	13.1 °C	1,257 mm	21	90
1951	35.4 °C10 August 1951	-12.5 °C19 February 1951	13.6 °C	1,308 mm	28	72
1950	32.4 °C22 July 1950	-5.3 °C21 February 1950	14.1 °C	1,187 mm	31	83
1949	32.8 °C6 August 1949	-4.5 °C18 January 1949	13.8 °C	1,336 mm	27	73
1948	31.1 °C6 July 1948	-4.2 °C3 January 1948	14.2 °C	1,270 mm	12	64
1947	34.0 °C14 August 1947	-6.8 °C4 February 1947	13.1 °C	1,034 mm	36	88
1946	36.3 °C17 July 1946	-6.6 °C4 February 1946	14.0 °C	1,047 mm	39	84
1945	32.5 °C4 August 1945	-12.5 °C24 February 1945	13.3 °C	1,386 mm	18	90
1944	33.6 °C9 August 1944	-5.7 °C3 February 1944	14.2 °C	925 mm	29	84
1943	33.2 °C8 August 1943	-9.8 °C2 February 1943	13.8 °C	615 mm	29	85
1942	35.1 °C17 August 1942	-10.2 °C3 January 1942	13.9 °C	825 mm	43	80
1941	31.7 °C18 August 1941	-5.2 °C27 January 1941	13.5 °C	1,466 mm	15	68
1940	34.5 °C25 July 1940	-6.6 °C28 January 1940	13.6 °C	913 mm	26	87

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

21.6 °C

+2.4 °C

Hot days (≥ 30 °C)

90 d/yr

+48

Frost days (< 0 °C)

45 d/yr

-4

Annual rainfall

1027 mm

-327 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	10.8 °C	+2.4 °C	33 mm	-11 mm
Feb	10.5 °C	+1.4 °C	7 mm	-46 mm
Mar	15.1 °C	+2.4 °C	147 mm	+59 mm
Apr	20.0 °C	+1.8 °C	133 mm	+31 mm
May	22.9 °C	+0.2 °C	175 mm	+49 mm
Jun	29.1 °C	+3.7 °C	121 mm	-46 mm
Jul	34.0 °C	+4.8 °C	32 mm	-127 mm
Aug	35.2 °C	+4.5 °C	47 mm	-92 mm
Sep	30.3 °C	+3.8 °C	160 mm	-28 mm
Oct	21.5 °C	+0.7 °C	109 mm	-58 mm
Nov	16.8 °C	+1.1 °C	20 mm	-58 mm
Dec	12.2 °C	+1.3 °C	45 mm	+1 mm

The year's extremes

Hottest day

39.5 °C

5 Aug 2025

Coldest day

-3.8 °C

5 Jan 2025

Wettest day

44.0 mm

5 Sep 2025

Windiest day

43.5 km/h

13 Feb 2025

Strongest gust

78.8 km/h

13 Feb 2025

Hottest feels-like

45.5 °C

5 Aug 2025

Coldest feels-like

-7.4 °C

5 Jan 2025

Snowiest day

9.6 cm

19 Mar 2025

Sunniest day

14.0 h

28 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 Ageo?

Ageo has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.9 °C and it receives 1,354 mm of precipitation per year.

What is the hottest day ever recorded in Ageo?

The hottest day measured in Ageo between 1940 and 2025 was 5 August 2025, reaching 39.5 °C.

What is the coldest day in Ageo?

The coldest day measured in Ageo between 1940 and 2025 was 16 February 1967, at -16.3 °C.

Does it snow in Ageo?

Yes. Ageo gets on average 22.5 cm of snow per year and has around 49 frost days.

Has the climate of Ageo warmed?

Yes: Ageo warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Ageo?

The wettest day measured in Ageo between 1940 and 2025 was 26 September 1958, with 254 mm of rain in 24 hours.

What was the windiest day in Ageo?

The windiest day measured in Ageo between 1940 and 2025 was 25 September 1966, with winds reaching 71.2 km/h.

What is the warmest month in Ageo?

The warmest month in Ageo is August (26.9 °C on average); the coldest is January (3.4 °C).

How much does it rain in Ageo?

Ageo receives on average 1,354 mm of precipitation per year, spread over about 133 rainy days.

Is it sunny in Ageo?

Ageo 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 Ageo?

The heaviest 24-hour snowfall measured in Ageo between 1940 and 2025 was 12 March 1969, with 35.0 cm.

Are there tropical nights in Ageo?

Yes: Ageo has on average 80 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Ageo?

In Ageo, between 1940 and 2025, the highest apparent temperature reached 45.7 °C on 16 August 2007, and the lowest was -20.9 °C on 16 February 1967.

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