Chiba climate — normals and trends

Q: What is the climate of Chiba?

Chiba has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 1,662 mm of precipitation per year.

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

The hottest day measured in Chiba between 1940 and 2025 was 23 July 2018, reaching 36.2 °C.

Q: What is the coldest day in Chiba?

The coldest day measured in Chiba between 1940 and 2025 was 5 February 1952, at -3.3 °C.

Q: Does it snow in Chiba?

Yes. Chiba gets on average 9.6 cm of snow per year and has around 3 frost days.

Q: Has the climate of Chiba warmed?

Yes: Chiba warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Chiba?

The wettest day measured in Chiba between 1940 and 2025 was 26 September 1958, with 201 mm of rain in 24 hours.

Q: What was the windiest day in Chiba?

The windiest day measured in Chiba between 1940 and 2025 was 1 October 2018, with winds reaching 85.8 km/h.

Q: What is the warmest month in Chiba?

The warmest month in Chiba is August (25.8 °C on average); the coldest is January (5.7 °C).

Q: How much does it rain in Chiba?

Chiba receives on average 1,662 mm of precipitation per year, spread over about 148 rainy days.

Q: Is it sunny in Chiba?

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

Chiba (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.4 °C and it receives 1,662 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 (25.8 °C on average) and the coldest is January (5.7 °C). Rainfall peaks in October.

Chiba averages 3 frost days, 8 hot days (≥ 30 °C) and 148 rainy days per year.

Chiba has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The number of frost days there went from about 6 to 0 per year over the period.

The hottest day of the period reached 36.2 °C (on 23 July 2018) and the coldest -3.3 °C (on 5 February 1952).

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

ChibaChiba

coords: 35.60°, 140.12°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthOctoberDriest monthJanuary

Mean daily temperature

15.4°C

Average daily high

17.8°C

Average daily low

13.2°C

Annual rainfall

1,662mm

Sunshine / day

8.0h

Mean relative humidity

78%

Average peak wind

22.8km/h

Seasonal range

20.1°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

8 d/yr

Rainy days (≥ 1 mm)

148 d/yr

Annual snowfall

9.6 cm

Average feels-like high

17.4 °C

Average feels-like low

11.8 °C

Average peak gust

36.5 km/h

Tropical nights (≥ 20 °C)

89 d/yr

Solar radiation

13.7 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.4 °C

since 1940

+0.2 °C per decade · r² = 0.47 · 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

36.2 °C

23 July 2018

Coldest day

-3.3 °C

5 February 1952

Wettest day

201 mm

26 September 1958

Windiest day

85.8 km/h

1 October 2018

Strongest gust

149.4 km/h

1 October 2018

Hottest feels-like

42.0 °C

29 July 2024

Coldest feels-like

-10.3 °C

22 January 1997

Snowiest day

33.0 cm

8 February 2014

Sunniest day

13.9 h

28 June 2025

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.3 °C21 August 2025	1.0 °C11 February 2025	16.8 °C	1,368 mm	49	0
2024	34.2 °C30 July 2024	1.9 °C14 January 2024	17.2 °C	2,026 mm	50	0
2023	33.4 °C18 July 2023	-1.9 °C25 January 2023	17.2 °C	1,505 mm	44	5
2022	32.7 °C3 August 2022	-0.4 °C20 January 2022	16.0 °C	1,707 mm	14	2
2021	33.1 °C26 August 2021	0.2 °C27 December 2021	16.4 °C	1,945 mm	14	0
2020	33.1 °C15 August 2020	-0.3 °C7 February 2020	16.4 °C	1,802 mm	26	1
2019	32.2 °C2 August 2019	1.3 °C10 January 2019	16.3 °C	1,882 mm	22	0
2018	36.2 °C23 July 2018	-2.3 °C25 January 2018	16.6 °C	1,645 mm	28	4
2017	33.2 °C23 August 2017	-0.2 °C15 January 2017	15.7 °C	1,727 mm	9	1
2016	33.3 °C9 August 2016	0.6 °C25 January 2016	16.3 °C	1,926 mm	4	0
2015	33.8 °C26 July 2015	0.9 °C9 February 2015	16.1 °C	1,932 mm	16	0
2014	31.2 °C25 July 2014	-0.6 °C6 February 2014	15.7 °C	1,778 mm	10	2
2013	35.2 °C11 August 2013	-0.5 °C25 February 2013	16.1 °C	1,514 mm	19	2
2012	31.0 °C26 July 2012	0.1 °C3 February 2012	15.5 °C	1,736 mm	14	0
2011	32.1 °C11 August 2011	-0.6 °C31 January 2011	15.7 °C	1,505 mm	11	1
2010	33.6 °C21 July 2010	-0.2 °C6 February 2010	16.2 °C	2,049 mm	29	1
2009	30.7 °C16 July 2009	1.1 °C26 January 2009	15.9 °C	1,968 mm	1	0
2008	31.8 °C8 August 2008	0.9 °C17 February 2008	15.8 °C	1,761 mm	13	0
2007	33.9 °C17 August 2007	1.5 °C25 February 2007	16.1 °C	1,575 mm	10	0
2006	32.5 °C5 August 2006	-0.7 °C4 February 2006	15.6 °C	2,036 mm	6	2
2005	32.1 °C27 July 2005	0.6 °C27 February 2005	15.4 °C	1,563 mm	5	0
2004	33.6 °C20 July 2004	2.0 °C26 January 2004	16.4 °C	1,849 mm	10	0
2003	30.2 °C24 August 2003	0.6 °C30 January 2003	15.4 °C	2,110 mm	1	0
2002	33.6 °C6 August 2002	1.3 °C10 February 2002	15.7 °C	1,603 mm	7	0
2001	35.0 °C24 July 2001	-0.3 °C16 January 2001	15.5 °C	1,656 mm	6	2
2000	31.8 °C17 July 2000	0.2 °C28 January 2000	15.8 °C	1,610 mm	5	0
1999	31.7 °C23 August 1999	-0.6 °C4 February 1999	16.1 °C	1,378 mm	5	2
1998	32.8 °C4 July 1998	0.1 °C25 January 1998	16.1 °C	1,940 mm	8	0
1997	30.9 °C21 August 1997	-1.8 °C22 January 1997	15.6 °C	1,237 mm	3	1
1996	31.3 °C16 August 1996	-1.5 °C20 February 1996	14.8 °C	1,592 mm	2	6
1995	34.4 °C4 August 1995	0.5 °C31 January 1995	15.5 °C	1,300 mm	27	0
1994	33.2 °C3 August 1994	-0.7 °C14 February 1994	15.9 °C	1,358 mm	23	2
1993	29.0 °C31 July 1993	1.5 °C9 February 1993	15.0 °C	2,000 mm	0	0
1992	31.9 °C27 July 1992	1.3 °C15 January 1992	15.3 °C	1,826 mm	7	0
1991	32.8 °C2 August 1991	0.7 °C24 January 1991	15.6 °C	2,057 mm	10	0
1990	31.3 °C8 August 1990	-1.1 °C27 January 1990	16.2 °C	1,470 mm	7	6
1989	30.2 °C10 August 1989	0.8 °C28 January 1989	15.6 °C	1,790 mm	1	0
1988	30.4 °C22 August 1988	-0.7 °C4 February 1988	14.9 °C	1,814 mm	2	5
1987	33.4 °C29 July 1987	-0.1 °C11 January 1987	15.4 °C	1,629 mm	7	1
1986	31.5 °C4 September 1986	-1.3 °C23 January 1986	14.6 °C	1,745 mm	1	4
1985	30.6 °C2 September 1985	-1.0 °C15 January 1985	15.1 °C	1,834 mm	4	7
1984	32.4 °C7 August 1984	-2.4 °C7 February 1984	14.3 °C	1,228 mm	10	22
1983	30.7 °C28 July 1983	-0.6 °C13 February 1983	15.0 °C	1,775 mm	5	2
1982	28.8 °C25 August 1982	-1.3 °C8 February 1982	15.2 °C	1,764 mm	0	5
1981	31.6 °C17 July 1981	-2.0 °C14 January 1981	14.6 °C	1,490 mm	1	5
1980	28.5 °C11 September 1980	-0.5 °C14 February 1980	14.8 °C	1,942 mm	0	3
1979	32.0 °C31 July 1979	-0.7 °C16 January 1979	15.9 °C	2,094 mm	4	3
1978	33.2 °C12 August 1978	-0.9 °C16 February 1978	15.4 °C	1,288 mm	9	5
1977	30.5 °C2 August 1977	-1.4 °C15 January 1977	15.5 °C	1,918 mm	3	8
1976	31.0 °C14 August 1976	-0.9 °C22 January 1976	14.9 °C	2,033 mm	1	5
1975	31.3 °C18 July 1975	-0.4 °C18 February 1975	15.2 °C	1,864 mm	1	1
1974	29.4 °C20 August 1974	-0.3 °C28 February 1974	15.0 °C	1,871 mm	0	1
1973	32.8 °C11 August 1973	0.7 °C8 February 1973	15.6 °C	1,605 mm	10	0
1972	33.4 °C8 August 1972	0.3 °C9 February 1972	15.7 °C	2,127 mm	3	0
1971	30.2 °C13 August 1971	-1.1 °C7 March 1971	14.9 °C	1,851 mm	2	1
1970	32.6 °C5 August 1970	-1.4 °C17 January 1970	14.8 °C	1,591 mm	3	3
1969	32.9 °C8 August 1969	-0.5 °C26 February 1969	15.2 °C	1,689 mm	6	1
1968	29.5 °C21 July 1968	-2.1 °C24 February 1968	15.1 °C	1,748 mm	0	7
1967	32.4 °C16 July 1967	-3.3 °C17 February 1967	15.3 °C	1,665 mm	8	10
1966	32.1 °C22 July 1966	-1.5 °C20 January 1966	15.2 °C	1,743 mm	3	4
1965	32.2 °C16 July 1965	-1.1 °C4 February 1965	14.8 °C	1,757 mm	3	2
1964	32.1 °C3 July 1964	0.4 °C14 February 1964	15.3 °C	1,817 mm	4	0
1963	30.8 °C16 August 1963	-0.3 °C25 January 1963	15.0 °C	1,635 mm	1	2
1962	32.1 °C7 August 1962	0.6 °C14 February 1962	15.5 °C	1,597 mm	5	0
1961	33.2 °C8 July 1961	-1.0 °C15 February 1961	15.9 °C	1,318 mm	8	4
1960	30.5 °C28 July 1960	-2.0 °C25 January 1960	15.5 °C	1,595 mm	2	3
1959	32.1 °C1 August 1959	-0.7 °C8 January 1959	15.9 °C	1,895 mm	4	3
1958	30.6 °C3 August 1958	-0.2 °C24 January 1958	15.4 °C	1,696 mm	1	1
1957	30.1 °C1 August 1957	-0.4 °C13 January 1957	15.2 °C	1,569 mm	2	2
1956	33.8 °C1 August 1956	-1.0 °C2 February 1956	15.0 °C	1,484 mm	8	5
1955	33.6 °C30 July 1955	-1.4 °C8 January 1955	15.6 °C	1,674 mm	6	5
1954	32.7 °C9 August 1954	-2.4 °C30 January 1954	15.2 °C	1,739 mm	5	9
1953	34.0 °C21 August 1953	-0.5 °C1 February 1953	14.7 °C	1,687 mm	7	3
1952	31.9 °C28 August 1952	-3.3 °C5 February 1952	14.7 °C	1,745 mm	5	13
1951	33.6 °C10 August 1951	-1.0 °C22 January 1951	15.0 °C	1,721 mm	7	5
1950	30.5 °C22 August 1950	-0.3 °C7 January 1950	15.5 °C	1,502 mm	1	2
1949	31.4 °C6 August 1949	-0.1 °C30 December 1949	15.0 °C	1,695 mm	2	1
1948	31.0 °C26 July 1948	0.0 °C24 February 1948	15.5 °C	1,517 mm	2	0
1947	32.1 °C12 August 1947	-2.9 °C3 February 1947	14.3 °C	1,200 mm	10	16
1946	33.8 °C15 July 1946	-0.3 °C10 February 1946	15.3 °C	1,258 mm	7	1
1945	30.1 °C16 July 1945	-1.3 °C4 February 1945	14.7 °C	1,516 mm	1	13
1944	30.9 °C30 August 1944	-1.2 °C3 February 1944	15.1 °C	959 mm	5	2
1943	30.9 °C9 August 1943	-1.3 °C21 February 1943	14.8 °C	676 mm	2	7
1942	32.3 °C17 August 1942	-2.8 °C10 February 1942	15.3 °C	844 mm	6	20
1941	30.7 °C8 August 1941	-0.8 °C26 January 1941	14.7 °C	1,806 mm	1	7
1940	32.2 °C23 July 1940	-1.3 °C10 January 1940	14.6 °C	984 mm	4	12

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

19.3 °C

+1.5 °C

Hot days (≥ 30 °C)

49 d/yr

+41

Frost days (< 0 °C)

0 d/yr

-3

Annual rainfall

1368 mm

-294 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	9.3 °C	+1.1 °C	47 mm	-22 mm
Feb	9.1 °C	+0.6 °C	17 mm	-67 mm
Mar	13.1 °C	+1.6 °C	198 mm	+62 mm
Apr	17.3 °C	+1.2 °C	163 mm	+24 mm
May	20.6 °C	+0.5 °C	210 mm	+57 mm
Jun	25.9 °C	+2.9 °C	121 mm	-66 mm
Jul	29.3 °C	+2.7 °C	51 mm	-91 mm
Aug	30.8 °C	+2.6 °C	64 mm	-63 mm
Sep	28.2 °C	+3.0 °C	140 mm	-61 mm
Oct	20.8 °C	+0.6 °C	205 mm	-24 mm
Nov	15.4 °C	-0.1 °C	59 mm	-67 mm
Dec	11.7 °C	+0.9 °C	95 mm	+23 mm

The year's extremes

Hottest day

34.3 °C

21 Aug 2025

Coldest day

1.0 °C

11 Feb 2025

Wettest day

54.3 mm

31 Oct 2025

Windiest day

46.2 km/h

17 May 2025

Strongest gust

70.9 km/h

17 May 2025

Hottest feels-like

41.7 °C

6 Aug 2025

Coldest feels-like

-6.7 °C

8 Feb 2025

Snowiest day

2.4 cm

3 Mar 2025

Sunniest day

13.9 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 Chiba?

Chiba has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 1,662 mm of precipitation per year.

What is the hottest day ever recorded in Chiba?

The hottest day measured in Chiba between 1940 and 2025 was 23 July 2018, reaching 36.2 °C.

What is the coldest day in Chiba?

The coldest day measured in Chiba between 1940 and 2025 was 5 February 1952, at -3.3 °C.

Does it snow in Chiba?

Yes. Chiba gets on average 9.6 cm of snow per year and has around 3 frost days.

Has the climate of Chiba warmed?

Yes: Chiba warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Chiba?

The wettest day measured in Chiba between 1940 and 2025 was 26 September 1958, with 201 mm of rain in 24 hours.

What was the windiest day in Chiba?

The windiest day measured in Chiba between 1940 and 2025 was 1 October 2018, with winds reaching 85.8 km/h.

What is the warmest month in Chiba?

The warmest month in Chiba is August (25.8 °C on average); the coldest is January (5.7 °C).

How much does it rain in Chiba?

Chiba receives on average 1,662 mm of precipitation per year, spread over about 148 rainy days.

Is it sunny in Chiba?

Chiba 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 Chiba?

The heaviest 24-hour snowfall measured in Chiba between 1940 and 2025 was 8 February 2014, with 33.0 cm.

Are there tropical nights in Chiba?

Yes: Chiba has on average 89 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Chiba?

In Chiba, between 1940 and 2025, the highest apparent temperature reached 42.0 °C on 29 July 2024, and the lowest was -10.3 °C on 22 January 1997.

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