Niimi climate — normals and trends

Q: What is the climate of Niimi?

Niimi has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,538 mm of precipitation per year.

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

The hottest day measured in Niimi between 1940 and 2025 was 7 August 1994, reaching 36.8 °C.

Q: What is the coldest day in Niimi?

The coldest day measured in Niimi between 1940 and 2025 was 14 February 1942, at -15.8 °C.

Q: Does it snow in Niimi?

Yes. Niimi gets on average 47.7 cm of snow per year and has around 82 frost days.

Q: Has the climate of Niimi warmed?

Yes: Niimi warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Niimi?

The wettest day measured in Niimi between 1940 and 2025 was 14 August 2021, with 207 mm of rain in 24 hours.

Q: What was the windiest day in Niimi?

The windiest day measured in Niimi between 1940 and 2025 was 7 September 2004, with winds reaching 54.9 km/h.

Q: What is the warmest month in Niimi?

The warmest month in Niimi is August (24.9 °C on average); the coldest is January (1.1 °C).

Q: How much does it rain in Niimi?

Niimi receives on average 1,538 mm of precipitation per year, spread over about 146 rainy days.

Q: Is it sunny in Niimi?

Niimi gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.

Niimi (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 12.7 °C and it receives 1,538 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 (1.1 °C). Rainfall peaks in July.

Niimi averages 82 frost days, 27 hot days (≥ 30 °C) and 146 rainy days per year.

Niimi has warmed by +2.7 °C between 1940 and 2025, or +0.32 °C per decade. This trend is statistically significant.

The number of frost days there went from about 106 to 58 per year over the period.

The hottest day of the period reached 36.8 °C (on 7 August 1994) and the coldest -15.8 °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

NiimiOkayama

coords: 34.98°, 133.47°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthDecember

Mean daily temperature

12.7°C

Average daily high

17.3°C

Average daily low

8.6°C

Annual rainfall

1,538mm

Sunshine / day

8.8h

Mean relative humidity

77%

Average peak wind

14.3km/h

Seasonal range

23.8°C

Frost days (< 0 °C)

82 d/yr

Hot days (≥ 30 °C)

27 d/yr

Rainy days (≥ 1 mm)

146 d/yr

Annual snowfall

47.7 cm

Average feels-like high

16.4 °C

Average feels-like low

7.4 °C

Average peak gust

38.4 km/h

Tropical nights (≥ 20 °C)

54 d/yr

Solar radiation

14.5 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.7 °C

since 1940

+0.3 °C per decade · r² = 0.70 · 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

36.8 °C

7 August 1994

Coldest day

-15.8 °C

14 February 1942

Wettest day

207 mm

14 August 2021

Windiest day

54.9 km/h

7 September 2004

Strongest gust

167.0 km/h

7 September 2004

Hottest feels-like

41.4 °C

6 August 1994

Coldest feels-like

-20.5 °C

14 February 1942

Snowiest day

31.7 cm

9 March 2010

Sunniest day

14.0 h

27 May 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	35.3 °C3 August 2025	-9.9 °C25 February 2025	13.4 °C	1,364 mm	69	92
2024	35.3 °C2 August 2024	-7.6 °C20 December 2024	14.7 °C	1,922 mm	66	53
2023	35.1 °C28 July 2023	-10.4 °C26 January 2023	14.5 °C	1,540 mm	48	54
2022	33.7 °C1 July 2022	-6.5 °C23 February 2022	14.1 °C	1,231 mm	46	71
2021	34.3 °C5 August 2021	-7.0 °C9 January 2021	14.1 °C	2,007 mm	28	53
2020	35.0 °C14 August 2020	-4.3 °C31 December 2020	14.1 °C	1,713 mm	37	44
2019	33.4 °C2 August 2019	-3.3 °C2 February 2019	14.1 °C	1,401 mm	32	57
2018	35.2 °C5 August 2018	-9.4 °C6 February 2018	13.9 °C	1,838 mm	44	61
2017	33.7 °C24 August 2017	-8.2 °C24 January 2017	13.3 °C	1,556 mm	38	76
2016	34.2 °C13 August 2016	-7.3 °C24 January 2016	14.2 °C	1,774 mm	42	57
2015	34.4 °C31 July 2015	-3.9 °C9 February 2015	13.8 °C	1,678 mm	21	46
2014	34.0 °C26 July 2014	-5.1 °C15 December 2014	13.3 °C	1,632 mm	13	77
2013	34.5 °C20 August 2013	-7.0 °C30 December 2013	13.8 °C	1,684 mm	43	66
2012	32.8 °C26 July 2012	-7.5 °C20 February 2012	13.2 °C	1,393 mm	37	76
2011	33.6 °C13 August 2011	-9.4 °C3 January 2011	13.5 °C	1,671 mm	38	81
2010	34.2 °C4 September 2010	-3.9 °C2 January 2010	13.9 °C	1,510 mm	51	54
2009	32.4 °C18 July 2009	-4.6 °C14 January 2009	13.7 °C	1,362 mm	13	52
2008	34.0 °C2 August 2008	-3.6 °C18 February 2008	13.6 °C	1,265 mm	39	64
2007	33.6 °C16 August 2007	-3.1 °C3 February 2007	13.9 °C	1,137 mm	31	53
2006	33.6 °C9 August 2006	-5.0 °C4 February 2006	13.5 °C	1,600 mm	31	66
2005	34.2 °C21 July 2005	-5.1 °C22 February 2005	13.4 °C	977 mm	44	77
2004	33.1 °C13 July 2004	-7.3 °C22 January 2004	14.2 °C	2,061 mm	35	63
2003	33.6 °C22 August 2003	-7.2 °C29 January 2003	13.4 °C	1,673 mm	21	69
2002	34.3 °C5 August 2002	-6.6 °C13 February 2002	13.8 °C	1,118 mm	42	64
2001	35.6 °C2 August 2001	-10.3 °C30 January 2001	13.3 °C	1,496 mm	38	83
2000	34.4 °C22 July 2000	-9.2 °C28 January 2000	13.4 °C	1,387 mm	43	75
1999	32.1 °C22 August 1999	-7.6 °C13 February 1999	13.5 °C	1,416 mm	15	70
1998	33.8 °C3 July 1998	-10.2 °C25 January 1998	14.3 °C	1,595 mm	27	59
1997	33.9 °C2 September 1997	-6.9 °C22 January 1997	13.2 °C	1,642 mm	31	76
1996	34.4 °C3 August 1996	-7.4 °C2 February 1996	12.7 °C	1,308 mm	34	100
1995	34.4 °C19 August 1995	-6.6 °C31 December 1995	12.7 °C	1,266 mm	43	94
1994	36.8 °C7 August 1994	-7.1 °C18 February 1994	14.2 °C	843 mm	62	74
1993	32.3 °C26 August 1993	-8.0 °C3 February 1993	12.8 °C	1,864 mm	5	76
1992	33.5 °C29 July 1992	-5.5 °C2 February 1992	13.3 °C	1,400 mm	22	60
1991	34.4 °C23 July 1991	-10.9 °C26 February 1991	13.5 °C	1,508 mm	24	62
1990	34.1 °C3 August 1990	-10.0 °C26 January 1990	14.1 °C	1,752 mm	53	52
1989	31.6 °C12 August 1989	-3.9 °C16 January 1989	13.4 °C	1,800 mm	14	53
1988	32.9 °C9 July 1988	-6.3 °C8 March 1988	12.5 °C	1,552 mm	15	77
1987	32.3 °C6 June 1987	-6.6 °C3 March 1987	13.2 °C	1,520 mm	24	79
1986	32.7 °C28 July 1986	-11.0 °C26 February 1986	12.3 °C	1,318 mm	23	92
1985	32.7 °C28 July 1985	-9.7 °C31 January 1985	12.8 °C	1,754 mm	24	80
1984	33.0 °C11 August 1984	-10.1 °C11 February 1984	12.2 °C	1,176 mm	37	103
1983	32.7 °C3 August 1983	-8.2 °C23 January 1983	13.0 °C	1,661 mm	32	77
1982	30.7 °C4 August 1982	-10.6 °C3 February 1982	12.6 °C	1,673 mm	4	78
1981	32.7 °C19 July 1981	-11.1 °C28 February 1981	11.9 °C	1,275 mm	25	101
1980	31.9 °C21 July 1980	-10.5 °C17 January 1980	11.8 °C	1,972 mm	3	99
1979	32.8 °C30 July 1979	-8.6 °C16 January 1979	13.0 °C	1,889 mm	24	83
1978	33.6 °C9 July 1978	-12.4 °C17 February 1978	12.9 °C	1,289 mm	38	88
1977	33.6 °C4 August 1977	-13.6 °C19 February 1977	12.7 °C	1,560 mm	20	85
1976	31.7 °C14 August 1976	-8.0 °C25 January 1976	11.9 °C	2,006 mm	13	104
1975	32.6 °C21 July 1975	-11.3 °C24 February 1975	12.8 °C	1,870 mm	23	94
1974	31.7 °C2 August 1974	-12.5 °C12 February 1974	12.2 °C	1,719 mm	17	94
1973	34.6 °C13 August 1973	-5.4 °C26 December 1973	12.7 °C	1,162 mm	37	98
1972	32.8 °C8 August 1972	-9.1 °C2 March 1972	12.5 °C	2,236 mm	19	84
1971	33.5 °C29 July 1971	-9.3 °C2 February 1971	12.4 °C	1,493 mm	21	87
1970	34.0 °C22 July 1970	-10.6 °C19 January 1970	12.1 °C	1,728 mm	27	108
1969	34.1 °C13 August 1969	-7.5 °C15 March 1969	12.2 °C	1,424 mm	35	99
1968	33.5 °C23 July 1968	-11.8 °C21 February 1968	12.1 °C	1,642 mm	13	90
1967	33.1 °C24 August 1967	-10.0 °C17 January 1967	12.5 °C	1,577 mm	43	100
1966	32.4 °C9 August 1966	-7.0 °C28 January 1966	11.7 °C	1,798 mm	15	101
1965	30.8 °C1 August 1965	-12.3 °C31 January 1965	11.0 °C	2,008 mm	8	117
1964	33.8 °C5 August 1964	-7.6 °C6 February 1964	13.2 °C	1,414 mm	44	83
1963	32.3 °C20 July 1963	-11.3 °C15 February 1963	12.0 °C	1,905 mm	22	99
1962	34.3 °C28 July 1962	-7.6 °C4 February 1962	12.5 °C	1,356 mm	24	92
1961	32.3 °C8 July 1961	-8.7 °C14 January 1961	13.3 °C	1,594 mm	36	84
1960	34.1 °C3 August 1960	-11.0 °C27 January 1960	13.0 °C	1,317 mm	25	81
1959	33.5 °C1 August 1959	-7.8 °C17 January 1959	13.5 °C	1,662 mm	32	59
1958	33.6 °C31 July 1958	-6.8 °C10 March 1958	12.8 °C	1,360 mm	21	82
1957	32.1 °C20 July 1957	-8.0 °C14 March 1957	12.1 °C	1,805 mm	10	86
1956	33.9 °C2 August 1956	-8.7 °C13 March 1956	12.0 °C	1,872 mm	30	92
1955	32.6 °C2 August 1955	-11.3 °C12 January 1955	12.8 °C	1,357 mm	33	80
1954	33.1 °C8 August 1954	-9.6 °C4 February 1954	12.6 °C	1,683 mm	20	68
1953	33.9 °C20 August 1953	-10.3 °C23 February 1953	12.6 °C	2,032 mm	23	85
1952	31.8 °C2 August 1952	-12.4 °C22 February 1952	11.4 °C	1,686 mm	7	101
1951	31.8 °C27 July 1951	-8.4 °C18 February 1951	11.6 °C	1,331 mm	20	95
1950	30.5 °C7 July 1950	-7.5 °C12 January 1950	11.8 °C	1,326 mm	3	107
1949	30.9 °C7 August 1949	-6.7 °C17 February 1949	11.4 °C	1,476 mm	2	101
1948	30.6 °C27 July 1948	-8.9 °C4 January 1948	12.0 °C	1,384 mm	2	85
1947	32.1 °C13 August 1947	-13.5 °C21 February 1947	10.5 °C	1,332 mm	9	115
1946	33.9 °C16 July 1946	-9.4 °C13 January 1946	11.9 °C	1,112 mm	20	108
1945	30.8 °C9 August 1945	-12.9 °C18 February 1945	10.7 °C	1,830 mm	2	110
1944	30.5 °C30 August 1944	-10.2 °C23 February 1944	11.6 °C	1,189 mm	5	117
1943	30.1 °C10 August 1943	-9.2 °C12 January 1943	11.1 °C	1,028 mm	2	119
1942	34.2 °C2 August 1942	-15.8 °C14 February 1942	11.4 °C	995 mm	27	116
1941	30.4 °C9 August 1941	-12.0 °C3 February 1941	11.3 °C	1,368 mm	2	103
1940	30.4 °C29 July 1940	-14.1 °C10 February 1940	10.9 °C	1,207 mm	1	110

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

18.5 °C

+1.2 °C

Hot days (≥ 30 °C)

69 d/yr

+42

Frost days (< 0 °C)

92 d/yr

+10

Annual rainfall

1364 mm

-174 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	5.2 °C	+0.1 °C	23 mm	-29 mm
Feb	3.6 °C	-2.4 °C	41 mm	-24 mm
Mar	11.6 °C	+1.2 °C	156 mm	+56 mm
Apr	17.7 °C	+1.0 °C	65 mm	-58 mm
May	21.3 °C	+0.2 °C	162 mm	+22 mm
Jun	27.1 °C	+2.7 °C	227 mm	+10 mm
Jul	31.9 °C	+3.7 °C	54 mm	-193 mm
Aug	31.4 °C	+2.2 °C	228 mm	+66 mm
Sep	27.3 °C	+2.3 °C	159 mm	-46 mm
Oct	21.1 °C	+1.7 °C	166 mm	+59 mm
Nov	14.4 °C	+0.7 °C	31 mm	-39 mm
Dec	8.6 °C	+0.7 °C	53 mm	+4 mm

The year's extremes

Hottest day

35.3 °C

3 Aug 2025

Coldest day

-9.9 °C

25 Feb 2025

Wettest day

118.4 mm

10 Aug 2025

Windiest day

33.2 km/h

5 Feb 2025

Strongest gust

77.0 km/h

5 Feb 2025

Hottest feels-like

39.9 °C

31 Jul 2025

Coldest feels-like

-14.1 °C

25 Feb 2025

Snowiest day

9.2 cm

1 Feb 2025

Sunniest day

14.0 h

27 May 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 Niimi?

Niimi has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 1,538 mm of precipitation per year.

What is the hottest day ever recorded in Niimi?

The hottest day measured in Niimi between 1940 and 2025 was 7 August 1994, reaching 36.8 °C.

What is the coldest day in Niimi?

The coldest day measured in Niimi between 1940 and 2025 was 14 February 1942, at -15.8 °C.

Does it snow in Niimi?

Yes. Niimi gets on average 47.7 cm of snow per year and has around 82 frost days.

Has the climate of Niimi warmed?

Yes: Niimi warmed by +2.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Niimi?

The wettest day measured in Niimi between 1940 and 2025 was 14 August 2021, with 207 mm of rain in 24 hours.

What was the windiest day in Niimi?

The windiest day measured in Niimi between 1940 and 2025 was 7 September 2004, with winds reaching 54.9 km/h.

What is the warmest month in Niimi?

The warmest month in Niimi is August (24.9 °C on average); the coldest is January (1.1 °C).

How much does it rain in Niimi?

Niimi receives on average 1,538 mm of precipitation per year, spread over about 146 rainy days.

Is it sunny in Niimi?

Niimi gets on average 8.8 hours of sunshine per day, roughly 3,212 hours per year over 1940-2025.

What is the biggest single-day snowfall in Niimi?

The heaviest 24-hour snowfall measured in Niimi between 1940 and 2025 was 9 March 2010, with 31.7 cm.

Are there tropical nights in Niimi?

Yes: Niimi has on average 54 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Niimi?

In Niimi, between 1940 and 2025, the highest apparent temperature reached 41.4 °C on 6 August 1994, and the lowest was -20.5 °C on 14 February 1942.

Compare Niimi with another city

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

Nearby cities

The climate around Niimi

Other cities — Japan

All cities in Japan →