Tachikawa climate — normals and trends

Q: What is the climate of Tachikawa?

Tachikawa has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.5 °C and it receives 1,540 mm of precipitation per year.

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

The hottest day measured in Tachikawa between 1940 and 2025 was 5 August 2025, reaching 38.5 °C.

Q: What is the coldest day in Tachikawa?

The coldest day measured in Tachikawa between 1940 and 2025 was 6 February 1952, at -18.2 °C.

Q: Does it snow in Tachikawa?

Yes. Tachikawa gets on average 32.4 cm of snow per year and has around 54 frost days.

Q: Has the climate of Tachikawa warmed?

Yes: Tachikawa warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Tachikawa?

The wettest day measured in Tachikawa between 1940 and 2025 was 26 September 1958, with 253 mm of rain in 24 hours.

Q: What was the windiest day in Tachikawa?

The windiest day measured in Tachikawa between 1940 and 2025 was 25 September 1966, with winds reaching 73.6 km/h.

Q: What is the warmest month in Tachikawa?

The warmest month in Tachikawa is August (26.4 °C on average); the coldest is January (3.0 °C).

Q: How much does it rain in Tachikawa?

Tachikawa receives on average 1,540 mm of precipitation per year, spread over about 153 rainy days.

Q: Is it sunny in Tachikawa?

Tachikawa gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

Tachikawa (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.5 °C and it receives 1,540 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 (26.4 °C on average) and the coldest is January (3.0 °C). Rainfall peaks in September.

Tachikawa averages 54 frost days, 34 hot days (≥ 30 °C) and 153 rainy days per year.

Tachikawa has warmed by +2.5 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.

The number of frost days there went from about 76 to 32 per year over the period.

The hottest day of the period reached 38.5 °C (on 5 August 2025) and the coldest -18.2 °C (on 6 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

TachikawaTokyo

coords: 35.71°, 139.42°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthSeptemberDriest monthJanuary

Mean daily temperature

14.5°C

Average daily high

18.7°C

Average daily low

10.8°C

Annual rainfall

1,540mm

Sunshine / day

8.2h

Mean relative humidity

74%

Average peak wind

15.4km/h

Seasonal range

23.4°C

Frost days (< 0 °C)

54 d/yr

Hot days (≥ 30 °C)

34 d/yr

Rainy days (≥ 1 mm)

153 d/yr

Annual snowfall

32.4 cm

Average feels-like high

18.4 °C

Average feels-like low

9.9 °C

Average peak gust

30.8 km/h

Tropical nights (≥ 20 °C)

76 d/yr

Solar radiation

13.3 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.5 °C

since 1940

+0.3 °C per decade · r² = 0.67 · 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

38.5 °C

5 August 2025

Coldest day

-18.2 °C

6 February 1952

Wettest day

253 mm

26 September 1958

Windiest day

73.6 km/h

25 September 1966

Strongest gust

164.2 km/h

27 September 1959

Hottest feels-like

45.9 °C

16 August 2007

Coldest feels-like

-23.4 °C

6 February 1952

Snowiest day

42.7 cm

12 March 1969

Sunniest day

14.0 h

23 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	38.5 °C5 August 2025	-3.6 °C23 February 2025	16.4 °C	1,139 mm	83	43
2024	37.1 °C11 August 2024	-3.0 °C29 December 2024	16.8 °C	1,744 mm	71	34
2023	37.3 °C26 July 2023	-5.2 °C26 January 2023	16.9 °C	1,322 mm	80	30
2022	36.5 °C30 June 2022	-4.0 °C7 January 2022	15.7 °C	1,553 mm	51	54
2021	37.0 °C10 August 2021	-4.8 °C10 January 2021	15.9 °C	1,722 mm	39	37
2020	36.9 °C11 August 2020	-3.8 °C7 February 2020	15.9 °C	1,554 mm	48	25
2019	36.2 °C9 September 2019	-3.3 °C10 January 2019	15.9 °C	1,724 mm	45	27
2018	37.9 °C23 July 2018	-8.9 °C25 January 2018	16.3 °C	1,447 mm	58	39
2017	34.7 °C9 August 2017	-4.5 °C25 January 2017	15.2 °C	1,585 mm	38	43
2016	36.5 °C9 August 2016	-4.8 °C21 January 2016	15.7 °C	1,667 mm	42	35
2015	36.5 °C7 August 2015	-3.7 °C10 February 2015	15.7 °C	1,686 mm	38	41
2014	36.7 °C5 August 2014	-4.6 °C5 February 2014	15.1 °C	1,559 mm	32	57
2013	36.6 °C10 August 2013	-7.5 °C18 January 2013	15.4 °C	1,351 mm	42	50
2012	35.0 °C13 August 2012	-5.3 °C27 January 2012	14.7 °C	1,583 mm	51	62
2011	36.8 °C18 August 2011	-4.2 °C31 January 2011	15.0 °C	1,550 mm	46	60
2010	34.9 °C23 July 2010	-3.2 °C14 January 2010	15.4 °C	1,875 mm	57	37
2009	33.8 °C15 July 2009	-5.2 °C25 January 2009	15.3 °C	1,725 mm	20	21
2008	35.1 °C15 August 2008	-4.9 °C4 February 2008	15.1 °C	1,627 mm	38	38
2007	37.0 °C16 August 2007	-2.8 °C25 February 2007	15.5 °C	1,544 mm	37	19
2006	34.3 °C5 August 2006	-4.5 °C5 February 2006	15.2 °C	1,728 mm	24	34
2005	34.7 °C27 July 2005	-6.1 °C2 January 2005	14.8 °C	1,406 mm	47	56
2004	37.5 °C20 July 2004	-3.8 °C23 January 2004	16.0 °C	1,694 mm	51	28
2003	33.2 °C23 August 2003	-6.5 °C30 January 2003	14.6 °C	1,827 mm	26	41
2002	36.1 °C8 August 2002	-3.4 °C4 January 2002	15.2 °C	1,497 mm	51	35
2001	36.6 °C13 July 2001	-9.8 °C30 January 2001	14.9 °C	1,473 mm	37	54
2000	36.5 °C2 September 2000	-5.0 °C28 January 2000	15.4 °C	1,461 mm	47	38
1999	34.1 °C30 July 1999	-5.5 °C14 February 1999	15.6 °C	1,411 mm	45	36
1998	35.0 °C16 August 1998	-11.6 °C25 January 1998	15.3 °C	1,887 mm	30	41
1997	36.7 °C5 July 1997	-4.2 °C26 January 1997	15.2 °C	1,237 mm	38	42
1996	38.1 °C15 August 1996	-10.6 °C20 February 1996	14.3 °C	1,467 mm	32	44
1995	35.8 °C19 August 1995	-4.7 °C6 March 1995	14.9 °C	1,313 mm	45	42
1994	37.0 °C3 August 1994	-13.3 °C14 February 1994	15.4 °C	1,436 mm	58	52
1993	31.7 °C28 July 1993	-3.7 °C3 February 1993	14.2 °C	1,871 mm	12	37
1992	35.6 °C3 September 1992	-7.6 °C2 February 1992	14.7 °C	1,562 mm	40	32
1991	35.4 °C24 July 1991	-10.3 °C30 December 1991	15.1 °C	1,959 mm	32	39
1990	37.1 °C19 July 1990	-11.6 °C25 January 1990	15.7 °C	1,612 mm	53	33
1989	32.1 °C8 August 1989	-6.8 °C29 January 1989	14.9 °C	1,624 mm	19	20
1988	32.7 °C9 July 1988	-4.7 °C4 February 1988	14.0 °C	1,643 mm	14	43
1987	36.1 °C24 July 1987	-8.2 °C14 January 1987	14.8 °C	1,390 mm	40	56
1986	33.1 °C4 September 1986	-11.6 °C26 February 1986	13.7 °C	1,638 mm	28	66
1985	33.8 °C2 September 1985	-9.9 °C31 January 1985	14.3 °C	1,714 mm	40	57
1984	36.6 °C3 September 1984	-14.7 °C9 February 1984	13.2 °C	1,102 mm	43	90
1983	35.6 °C19 August 1983	-6.5 °C23 January 1983	14.2 °C	1,530 mm	29	54
1982	31.7 °C12 July 1982	-6.6 °C30 January 1982	14.5 °C	1,726 mm	14	35
1981	32.9 °C18 July 1981	-11.1 °C18 February 1981	13.5 °C	1,491 mm	28	73
1980	32.7 °C23 July 1980	-8.1 °C29 February 1980	13.8 °C	1,686 mm	10	67
1979	34.0 °C23 June 1979	-13.9 °C16 January 1979	15.2 °C	1,850 mm	37	44
1978	36.4 °C21 August 1978	-9.7 °C23 January 1978	14.5 °C	1,293 mm	58	64
1977	33.5 °C5 August 1977	-12.2 °C14 January 1977	14.4 °C	1,706 mm	17	65
1976	32.7 °C24 August 1976	-6.2 °C21 March 1976	13.8 °C	1,644 mm	18	53
1975	34.3 °C5 August 1975	-7.0 °C17 February 1975	14.3 °C	1,653 mm	39	60
1974	32.9 °C30 July 1974	-10.1 °C12 February 1974	13.9 °C	1,691 mm	28	60
1973	36.1 °C19 August 1973	-4.3 °C8 February 1973	14.5 °C	1,414 mm	41	54
1972	34.6 °C8 August 1972	-6.2 °C9 February 1972	14.8 °C	1,956 mm	32	44
1971	34.0 °C8 July 1971	-8.6 °C6 January 1971	14.1 °C	1,752 mm	32	48
1970	33.3 °C18 July 1970	-9.7 °C6 January 1970	13.8 °C	1,534 mm	36	69
1969	34.9 °C30 July 1969	-8.4 °C1 March 1969	14.1 °C	1,586 mm	28	56
1968	32.3 °C20 July 1968	-13.2 °C25 February 1968	14.1 °C	1,700 mm	22	62
1967	35.4 °C11 August 1967	-15.5 °C14 February 1967	14.2 °C	1,454 mm	41	74
1966	32.3 °C7 August 1966	-7.2 °C29 December 1966	13.6 °C	1,701 mm	16	63
1965	32.4 °C30 July 1965	-8.8 °C4 February 1965	13.3 °C	1,660 mm	15	74
1964	34.0 °C16 August 1964	-6.1 °C29 February 1964	14.4 °C	1,751 mm	38	48
1963	35.4 °C13 August 1963	-6.4 °C26 January 1963	14.2 °C	1,381 mm	34	71
1962	37.3 °C4 August 1962	-4.9 °C26 January 1962	14.5 °C	1,447 mm	40	58
1961	35.5 °C26 July 1961	-6.3 °C3 February 1961	15.2 °C	1,390 mm	45	60
1960	33.0 °C8 August 1960	-6.5 °C25 January 1960	14.6 °C	1,547 mm	30	44
1959	33.8 °C2 September 1959	-7.1 °C7 January 1959	14.8 °C	1,903 mm	32	51
1958	34.9 °C1 August 1958	-9.3 °C30 March 1958	14.5 °C	1,707 mm	30	51
1957	33.3 °C31 July 1957	-8.0 °C12 February 1957	14.2 °C	1,632 mm	25	54
1956	35.3 °C2 August 1956	-10.2 °C26 January 1956	14.1 °C	1,521 mm	28	80
1955	35.4 °C31 July 1955	-5.0 °C12 February 1955	14.9 °C	1,409 mm	40	55
1954	34.4 °C17 August 1954	-13.4 °C30 January 1954	14.1 °C	1,553 mm	27	51
1953	35.5 °C21 August 1953	-11.6 °C23 February 1953	14.0 °C	1,659 mm	20	56
1952	32.9 °C4 September 1952	-18.2 °C6 February 1952	12.8 °C	1,460 mm	18	88
1951	34.3 °C10 August 1951	-11.7 °C15 January 1951	13.4 °C	1,492 mm	19	73
1950	31.7 °C9 July 1950	-6.7 °C21 February 1950	13.7 °C	1,312 mm	16	84
1949	31.5 °C14 August 1949	-5.4 °C30 December 1949	13.5 °C	1,607 mm	19	68
1948	30.4 °C26 July 1948	-5.1 °C3 January 1948	13.9 °C	1,477 mm	5	65
1947	33.7 °C15 August 1947	-8.8 °C4 February 1947	12.7 °C	1,184 mm	30	93
1946	35.2 °C17 July 1946	-8.2 °C4 February 1946	13.7 °C	1,195 mm	31	86
1945	31.2 °C9 September 1945	-15.3 °C24 February 1945	12.9 °C	1,569 mm	11	89
1944	33.3 °C9 August 1944	-5.8 °C3 February 1944	13.8 °C	1,047 mm	21	84
1943	32.2 °C10 August 1943	-8.6 °C2 February 1943	13.4 °C	719 mm	18	84
1942	34.5 °C17 August 1942	-11.0 °C14 February 1942	13.6 °C	902 mm	32	82
1941	31.3 °C28 July 1941	-9.0 °C26 January 1941	13.2 °C	1,668 mm	7	74
1940	35.1 °C25 July 1940	-7.5 °C28 January 1940	13.2 °C	958 mm	22	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

21.1 °C

+2.4 °C

Hot days (≥ 30 °C)

83 d/yr

+49

Frost days (< 0 °C)

43 d/yr

-11

Annual rainfall

1139 mm

-401 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	10.6 °C	+2.4 °C	42 mm	-12 mm
Feb	10.6 °C	+1.8 °C	18 mm	-49 mm
Mar	14.8 °C	+2.5 °C	160 mm	+49 mm
Apr	19.5 °C	+1.9 °C	143 mm	+23 mm
May	22.3 °C	+0.4 °C	188 mm	+49 mm
Jun	28.2 °C	+3.6 °C	125 mm	-57 mm
Jul	32.8 °C	+4.3 °C	56 mm	-117 mm
Aug	34.3 °C	+4.3 °C	42 mm	-114 mm
Sep	29.8 °C	+3.9 °C	152 mm	-49 mm
Oct	20.9 °C	+0.6 °C	131 mm	-57 mm
Nov	16.4 °C	+0.9 °C	25 mm	-70 mm
Dec	12.0 °C	+1.3 °C	57 mm	+3 mm

The year's extremes

Hottest day

38.5 °C

5 Aug 2025

Coldest day

-3.6 °C

23 Feb 2025

Wettest day

52.0 mm

2 May 2025

Windiest day

35.3 km/h

13 Feb 2025

Strongest gust

66.2 km/h

15 Jul 2025

Hottest feels-like

44.3 °C

5 Aug 2025

Coldest feels-like

-8.1 °C

23 Feb 2025

Snowiest day

9.9 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 Tachikawa?

Tachikawa has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.5 °C and it receives 1,540 mm of precipitation per year.

What is the hottest day ever recorded in Tachikawa?

The hottest day measured in Tachikawa between 1940 and 2025 was 5 August 2025, reaching 38.5 °C.

What is the coldest day in Tachikawa?

The coldest day measured in Tachikawa between 1940 and 2025 was 6 February 1952, at -18.2 °C.

Does it snow in Tachikawa?

Yes. Tachikawa gets on average 32.4 cm of snow per year and has around 54 frost days.

Has the climate of Tachikawa warmed?

Yes: Tachikawa warmed by +2.5 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Tachikawa?

The wettest day measured in Tachikawa between 1940 and 2025 was 26 September 1958, with 253 mm of rain in 24 hours.

What was the windiest day in Tachikawa?

The windiest day measured in Tachikawa between 1940 and 2025 was 25 September 1966, with winds reaching 73.6 km/h.

What is the warmest month in Tachikawa?

The warmest month in Tachikawa is August (26.4 °C on average); the coldest is January (3.0 °C).

How much does it rain in Tachikawa?

Tachikawa receives on average 1,540 mm of precipitation per year, spread over about 153 rainy days.

Is it sunny in Tachikawa?

Tachikawa gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.

What is the biggest single-day snowfall in Tachikawa?

The heaviest 24-hour snowfall measured in Tachikawa between 1940 and 2025 was 12 March 1969, with 42.7 cm.

Are there tropical nights in Tachikawa?

Yes: Tachikawa has on average 76 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Tachikawa?

In Tachikawa, between 1940 and 2025, the highest apparent temperature reached 45.9 °C on 16 August 2007, and the lowest was -23.4 °C on 6 February 1952.

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