Chichibu climate — normals and trends

Q: What is the climate of Chichibu?

Chichibu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 2,153 mm of precipitation per year.

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

The hottest day measured in Chichibu between 1940 and 2025 was 7 July 2024, reaching 35.0 °C.

Q: What is the coldest day in Chichibu?

The coldest day measured in Chichibu between 1940 and 2025 was 14 February 1942, at -18.1 °C.

Q: Does it snow in Chichibu?

Yes. Chichibu gets on average 90.7 cm of snow per year and has around 90 frost days.

Q: Has the climate of Chichibu warmed?

Yes: Chichibu warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Chichibu?

The wettest day measured in Chichibu between 1940 and 2025 was 12 October 2019, with 313 mm of rain in 24 hours.

Q: What was the windiest day in Chichibu?

The windiest day measured in Chichibu between 1940 and 2025 was 6 September 2007, with winds reaching 37.7 km/h.

Q: What is the warmest month in Chichibu?

The warmest month in Chichibu is August (23.2 °C on average); the coldest is January (0.2 °C).

Q: How much does it rain in Chichibu?

Chichibu receives on average 2,153 mm of precipitation per year, spread over about 200 rainy days.

Q: Is it sunny in Chichibu?

Chichibu gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

Chichibu (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 11.6 °C and it receives 2,153 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 (23.2 °C on average) and the coldest is January (0.2 °C). Rainfall peaks in July.

Chichibu averages 90 frost days, 10 hot days (≥ 30 °C) and 200 rainy days per year.

Chichibu has warmed by +2.8 °C between 1940 and 2025, or +0.33 °C per decade. This trend is statistically significant.

The number of frost days there went from about 113 to 67 per year over the period.

The hottest day of the period reached 35.0 °C (on 7 July 2024) and the coldest -18.1 °C (on 14 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

ChichibuSaitama

coords: 35.99°, 139.08°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthJanuary

Mean daily temperature

11.6°C

Average daily high

16.1°C

Average daily low

7.8°C

Annual rainfall

2,153mm

Sunshine / day

8.4h

Mean relative humidity

75%

Average peak wind

10.0km/h

Seasonal range

23.0°C

Frost days (< 0 °C)

90 d/yr

Hot days (≥ 30 °C)

10 d/yr

Rainy days (≥ 1 mm)

200 d/yr

Annual snowfall

90.7 cm

Average feels-like high

15.6 °C

Average feels-like low

6.5 °C

Average peak gust

32.8 km/h

Tropical nights (≥ 20 °C)

39 d/yr

Solar radiation

13.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.8 °C

since 1940

+0.3 °C per decade · r² = 0.71 · 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

35.0 °C

7 July 2024

Coldest day

-18.1 °C

14 February 1942

Wettest day

313 mm

12 October 2019

Windiest day

37.7 km/h

6 September 2007

Strongest gust

155.2 km/h

2 August 1982

Hottest feels-like

40.9 °C

29 July 2024

Coldest feels-like

-23.7 °C

14 February 1942

Snowiest day

57.6 cm

15 February 2014

Sunniest day

14.0 h

20 June 1962

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	33.7 °C5 August 2025	-6.4 °C23 February 2025	13.2 °C	1,736 mm	43	86
2024	35.0 °C7 July 2024	-4.4 °C7 February 2024	14.1 °C	2,391 mm	41	70
2023	34.3 °C16 July 2023	-6.9 °C26 January 2023	14.1 °C	1,891 mm	34	57
2022	34.3 °C25 June 2022	-6.2 °C21 February 2022	13.1 °C	2,085 mm	21	79
2021	32.9 °C10 August 2021	-5.3 °C10 January 2021	13.2 °C	2,209 mm	16	59
2020	34.5 °C11 August 2020	-4.9 °C6 February 2020	13.2 °C	2,475 mm	22	49
2019	32.8 °C9 September 2019	-6.6 °C10 February 2019	13.2 °C	2,286 mm	18	63
2018	34.0 °C23 July 2018	-12.3 °C7 February 2018	13.6 °C	1,810 mm	34	62
2017	32.2 °C3 July 2017	-4.8 °C25 January 2017	12.5 °C	2,103 mm	11	80
2016	33.4 °C17 August 2016	-11.6 °C19 January 2016	12.9 °C	2,075 mm	6	74
2015	32.8 °C14 July 2015	-6.9 °C18 January 2015	13.0 °C	2,068 mm	17	68
2014	33.3 °C5 August 2014	-12.0 °C5 February 2014	12.2 °C	2,037 mm	12	89
2013	33.0 °C10 August 2013	-11.0 °C18 January 2013	12.6 °C	1,937 mm	16	84
2012	32.2 °C16 July 2012	-9.7 °C3 February 2012	11.8 °C	2,155 mm	7	99
2011	32.7 °C24 June 2011	-8.3 °C16 February 2011	12.4 °C	2,258 mm	18	101
2010	32.3 °C23 July 2010	-7.4 °C5 February 2010	12.7 °C	2,573 mm	23	75
2009	32.1 °C13 July 2009	-8.0 °C25 January 2009	12.6 °C	2,248 mm	5	55
2008	31.2 °C3 August 2008	-7.5 °C4 February 2008	12.4 °C	2,308 mm	6	71
2007	32.8 °C16 August 2007	-3.8 °C26 February 2007	12.7 °C	2,313 mm	15	56
2006	32.1 °C4 August 2006	-5.8 °C5 February 2006	12.6 °C	2,140 mm	8	62
2005	33.0 °C28 June 2005	-10.5 °C2 January 2005	12.3 °C	2,077 mm	12	98
2004	33.6 °C20 July 2004	-10.1 °C23 January 2004	13.1 °C	2,264 mm	15	68
2003	32.2 °C23 August 2003	-11.8 °C6 January 2003	11.6 °C	2,160 mm	4	85
2002	32.5 °C8 August 2002	-10.3 °C30 January 2002	12.1 °C	2,152 mm	18	67
2001	32.6 °C4 July 2001	-12.9 °C15 January 2001	11.8 °C	2,175 mm	12	86
2000	33.6 °C2 September 2000	-10.0 °C28 January 2000	12.4 °C	2,088 mm	10	73
1999	32.5 °C24 July 1999	-12.1 °C13 February 1999	12.6 °C	2,201 mm	13	76
1998	32.7 °C3 July 1998	-11.2 °C25 January 1998	12.6 °C	2,701 mm	7	76
1997	34.3 °C10 August 1997	-9.5 °C22 February 1997	12.1 °C	1,804 mm	11	75
1996	34.8 °C15 August 1996	-13.4 °C25 January 1996	11.3 °C	1,976 mm	9	96
1995	32.7 °C24 July 1995	-10.3 °C17 February 1995	11.6 °C	2,001 mm	24	95
1994	33.7 °C5 July 1994	-12.8 °C31 January 1994	12.3 °C	1,978 mm	16	95
1993	31.1 °C13 May 1993	-8.6 °C22 January 1993	11.3 °C	2,417 mm	2	90
1992	32.6 °C31 July 1992	-9.7 °C22 February 1992	11.7 °C	1,970 mm	13	82
1991	34.4 °C24 July 1991	-10.2 °C24 January 1991	12.3 °C	2,405 mm	11	73
1990	33.2 °C17 July 1990	-11.2 °C28 January 1990	12.7 °C	2,098 mm	17	59
1989	30.6 °C8 August 1989	-10.5 °C29 January 1989	11.9 °C	2,320 mm	2	65
1988	31.1 °C9 July 1988	-12.0 °C7 January 1988	11.0 °C	2,353 mm	1	98
1987	34.2 °C24 July 1987	-12.8 °C11 January 1987	12.0 °C	1,717 mm	19	94
1986	31.6 °C4 September 1986	-14.0 °C10 February 1986	10.8 °C	2,187 mm	4	97
1985	31.3 °C29 July 1985	-13.3 °C31 January 1985	11.3 °C	2,102 mm	6	91
1984	32.6 °C2 September 1984	-13.7 °C8 February 1984	10.3 °C	1,586 mm	9	118
1983	31.8 °C19 August 1983	-14.0 °C23 January 1983	11.3 °C	2,078 mm	8	95
1982	29.9 °C12 July 1982	-13.6 °C2 February 1982	11.4 °C	2,306 mm	0	85
1981	31.6 °C10 July 1981	-14.5 °C27 February 1981	10.8 °C	2,064 mm	4	95
1980	30.8 °C23 July 1980	-10.9 °C7 February 1980	10.9 °C	2,253 mm	1	104
1979	31.7 °C27 August 1979	-12.1 °C19 January 1979	12.2 °C	2,341 mm	8	88
1978	32.2 °C21 August 1978	-13.6 °C19 February 1978	11.6 °C	1,960 mm	12	94
1977	31.4 °C13 July 1977	-14.5 °C17 February 1977	11.5 °C	2,244 mm	4	78
1976	31.2 °C1 August 1976	-12.6 °C28 December 1976	11.0 °C	2,318 mm	6	92
1975	31.2 °C28 July 1975	-14.0 °C16 February 1975	11.1 °C	2,332 mm	9	112
1974	30.3 °C30 July 1974	-15.3 °C12 February 1974	11.0 °C	2,436 mm	3	108
1973	31.4 °C10 August 1973	-10.0 °C19 March 1973	11.5 °C	2,105 mm	10	110
1972	32.1 °C8 August 1972	-11.2 °C25 February 1972	11.7 °C	2,747 mm	9	85
1971	31.7 °C8 July 1971	-11.3 °C5 January 1971	11.1 °C	2,452 mm	9	93
1970	32.0 °C18 July 1970	-13.7 °C6 January 1970	10.8 °C	2,136 mm	12	106
1969	32.2 °C30 July 1969	-13.1 °C15 January 1969	11.2 °C	2,118 mm	6	105
1968	31.3 °C20 July 1968	-12.9 °C2 February 1968	11.2 °C	2,412 mm	3	83
1967	30.9 °C5 August 1967	-14.6 °C14 February 1967	11.1 °C	2,108 mm	6	106
1966	29.3 °C17 July 1966	-11.6 °C20 January 1966	10.7 °C	2,229 mm	0	104
1965	32.5 °C30 July 1965	-13.8 °C4 February 1965	10.3 °C	2,278 mm	2	112
1964	31.8 °C24 July 1964	-10.9 °C14 February 1964	11.5 °C	2,451 mm	7	96
1963	31.3 °C13 August 1963	-12.6 °C15 February 1963	11.3 °C	1,932 mm	9	101
1962	33.7 °C9 August 1962	-10.8 °C26 January 1962	11.3 °C	2,155 mm	14	107
1961	33.5 °C26 July 1961	-6.2 °C10 March 1961	12.4 °C	2,040 mm	11	101
1960	30.9 °C1 August 1960	-12.2 °C12 February 1960	11.7 °C	2,219 mm	8	90
1959	32.7 °C2 September 1959	-12.9 °C22 December 1959	11.9 °C	2,808 mm	9	84
1958	33.0 °C1 August 1958	-14.3 °C31 March 1958	11.5 °C	2,431 mm	5	88
1957	31.0 °C28 July 1957	-11.5 °C12 February 1957	11.1 °C	2,263 mm	5	97
1956	31.2 °C2 August 1956	-11.5 °C26 January 1956	11.0 °C	2,272 mm	8	111
1955	31.7 °C1 August 1955	-11.5 °C12 February 1955	12.0 °C	1,845 mm	9	81
1954	31.9 °C9 August 1954	-11.6 °C26 January 1954	11.2 °C	2,026 mm	5	87
1953	34.0 °C21 August 1953	-11.4 °C2 February 1953	11.2 °C	2,343 mm	7	98
1952	29.9 °C20 August 1952	-15.4 °C6 February 1952	10.0 °C	1,968 mm	0	115
1951	30.7 °C9 August 1951	-16.7 °C15 January 1951	10.4 °C	2,032 mm	2	106
1950	29.8 °C9 July 1950	-13.7 °C21 February 1950	10.6 °C	1,977 mm	0	118
1949	30.1 °C18 July 1949	-10.5 °C30 December 1949	10.5 °C	2,177 mm	1	117
1948	28.3 °C26 July 1948	-8.9 °C7 February 1948	11.1 °C	2,123 mm	0	100
1947	30.9 °C14 August 1947	-13.6 °C4 February 1947	9.6 °C	1,982 mm	6	125
1946	31.5 °C16 July 1946	-13.9 °C4 February 1946	10.6 °C	1,918 mm	5	120
1945	29.7 °C7 August 1945	-16.1 °C24 February 1945	9.9 °C	2,197 mm	0	117
1944	29.9 °C1 July 1944	-10.5 °C20 February 1944	10.7 °C	2,116 mm	0	115
1943	28.4 °C9 August 1943	-11.5 °C16 February 1943	10.1 °C	1,461 mm	0	112
1942	30.7 °C11 July 1942	-18.1 °C14 February 1942	10.3 °C	1,762 mm	2	114
1941	28.6 °C28 July 1941	-13.1 °C13 January 1941	10.2 °C	2,237 mm	0	116
1940	31.3 °C18 July 1940	-15.4 °C19 February 1940	9.9 °C	1,672 mm	1	115

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

18.2 °C

+2.1 °C

Hot days (≥ 30 °C)

43 d/yr

+33

Frost days (< 0 °C)

86 d/yr

-4

Annual rainfall

1736 mm

-417 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	7.7 °C	+2.2 °C	49 mm	-7 mm
Feb	7.4 °C	+1.3 °C	16 mm	-58 mm
Mar	12.2 °C	+2.6 °C	182 mm	+57 mm
Apr	17.4 °C	+1.9 °C	181 mm	+35 mm
May	20.1 °C	+0.5 °C	239 mm	+44 mm
Jun	25.7 °C	+3.7 °C	216 mm	-68 mm
Jul	29.4 °C	+3.6 °C	188 mm	-125 mm
Aug	29.8 °C	+2.9 °C	168 mm	-127 mm
Sep	26.0 °C	+3.1 °C	275 mm	-17 mm
Oct	18.2 °C	+0.6 °C	144 mm	-74 mm
Nov	13.9 °C	+0.8 °C	28 mm	-71 mm
Dec	9.7 °C	+1.4 °C	50 mm	-7 mm

The year's extremes

Hottest day

33.7 °C

5 Aug 2025

Coldest day

-6.4 °C

23 Feb 2025

Wettest day

58.1 mm

5 Sep 2025

Windiest day

24.7 km/h

13 Feb 2025

Strongest gust

76.7 km/h

13 Feb 2025

Hottest feels-like

40.6 °C

5 Aug 2025

Coldest feels-like

-11.2 °C

23 Feb 2025

Snowiest day

19.4 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 Chichibu?

Chichibu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 11.6 °C and it receives 2,153 mm of precipitation per year.

What is the hottest day ever recorded in Chichibu?

The hottest day measured in Chichibu between 1940 and 2025 was 7 July 2024, reaching 35.0 °C.

What is the coldest day in Chichibu?

The coldest day measured in Chichibu between 1940 and 2025 was 14 February 1942, at -18.1 °C.

Does it snow in Chichibu?

Yes. Chichibu gets on average 90.7 cm of snow per year and has around 90 frost days.

Has the climate of Chichibu warmed?

Yes: Chichibu warmed by +2.8 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Chichibu?

The wettest day measured in Chichibu between 1940 and 2025 was 12 October 2019, with 313 mm of rain in 24 hours.

What was the windiest day in Chichibu?

The windiest day measured in Chichibu between 1940 and 2025 was 6 September 2007, with winds reaching 37.7 km/h.

What is the warmest month in Chichibu?

The warmest month in Chichibu is August (23.2 °C on average); the coldest is January (0.2 °C).

How much does it rain in Chichibu?

Chichibu receives on average 2,153 mm of precipitation per year, spread over about 200 rainy days.

Is it sunny in Chichibu?

Chichibu gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.

What is the biggest single-day snowfall in Chichibu?

The heaviest 24-hour snowfall measured in Chichibu between 1940 and 2025 was 15 February 2014, with 57.6 cm.

Are there tropical nights in Chichibu?

Yes: Chichibu has on average 39 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Chichibu?

In Chichibu, between 1940 and 2025, the highest apparent temperature reached 40.9 °C on 29 July 2024, and the lowest was -23.7 °C on 14 February 1942.

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