Nankoku climate — normals and trends

Q: What is the climate of Nankoku?

Nankoku has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 2,072 mm of precipitation per year.

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

The hottest day measured in Nankoku between 1940 and 2025 was 30 July 2024, reaching 34.8 °C.

Q: What is the coldest day in Nankoku?

The coldest day measured in Nankoku between 1940 and 2025 was 3 February 1977, at -4.9 °C.

Q: Does it snow in Nankoku?

Yes. Nankoku gets on average 1.6 cm of snow per year and has around 3 frost days.

Q: Has the climate of Nankoku warmed?

Yes: Nankoku warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Nankoku?

The wettest day measured in Nankoku between 1940 and 2025 was 17 August 1975, with 216 mm of rain in 24 hours.

Q: What was the windiest day in Nankoku?

The windiest day measured in Nankoku between 1940 and 2025 was 25 September 1964, with winds reaching 72.3 km/h.

Q: What is the warmest month in Nankoku?

The warmest month in Nankoku is August (26.5 °C on average); the coldest is January (6.6 °C).

Q: How much does it rain in Nankoku?

Nankoku receives on average 2,072 mm of precipitation per year, spread over about 145 rainy days.

Q: Is it sunny in Nankoku?

Nankoku gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.

Nankoku (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.5 °C and it receives 2,072 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 (26.5 °C on average) and the coldest is January (6.6 °C). Rainfall peaks in June.

Nankoku averages 3 frost days, 14 hot days (≥ 30 °C) and 145 rainy days per year.

Nankoku has warmed by +2.2 °C between 1940 and 2025, or +0.26 °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 34.8 °C (on 30 July 2024) and the coldest -4.9 °C (on 3 February 1977).

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

NankokuKochi

coords: 33.57°, 133.65°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJuneDriest monthJanuary

Mean daily temperature

16.5°C

Average daily high

19.5°C

Average daily low

13.8°C

Annual rainfall

2,072mm

Sunshine / day

9.0h

Mean relative humidity

75%

Average peak wind

15.4km/h

Seasonal range

19.9°C

Frost days (< 0 °C)

3 d/yr

Hot days (≥ 30 °C)

14 d/yr

Rainy days (≥ 1 mm)

145 d/yr

Annual snowfall

1.6 cm

Average feels-like high

19.9 °C

Average feels-like low

13.3 °C

Average peak gust

34.0 km/h

Tropical nights (≥ 20 °C)

105 d/yr

Solar radiation

15.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.2 °C

since 1940

+0.3 °C per decade · r² = 0.69 · 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

34.8 °C

30 July 2024

Coldest day

-4.9 °C

3 February 1977

Wettest day

216 mm

17 August 1975

Windiest day

72.3 km/h

25 September 1964

Strongest gust

170.6 km/h

4 September 1993

Hottest feels-like

41.5 °C

16 August 2024

Coldest feels-like

-11.1 °C

26 February 1981

Snowiest day

7.4 cm

15 February 1968

Sunniest day

14.0 h

28 May 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	33.0 °C6 July 2025	-0.9 °C10 January 2025	17.4 °C	1,775 mm	49	3
2024	34.8 °C30 July 2024	0.8 °C24 January 2024	18.3 °C	2,219 mm	58	0
2023	33.2 °C4 September 2023	-1.5 °C25 January 2023	17.8 °C	2,124 mm	23	2
2022	33.1 °C4 August 2022	0.6 °C17 February 2022	17.6 °C	1,741 mm	33	0
2021	32.1 °C27 July 2021	-1.1 °C9 January 2021	17.6 °C	2,441 mm	15	4
2020	34.2 °C16 August 2020	2.4 °C31 December 2020	17.7 °C	2,535 mm	27	0
2019	32.3 °C5 August 2019	2.7 °C27 January 2019	17.7 °C	2,100 mm	21	0
2018	33.3 °C24 July 2018	-0.9 °C7 February 2018	17.4 °C	2,712 mm	28	6
2017	32.5 °C17 July 2017	0.8 °C15 January 2017	17.0 °C	2,085 mm	24	0
2016	31.8 °C8 August 2016	-2.0 °C24 January 2016	18.0 °C	2,337 mm	23	2
2015	32.2 °C30 July 2015	0.7 °C9 February 2015	17.4 °C	2,718 mm	19	0
2014	32.7 °C24 July 2014	1.5 °C7 March 2014	16.9 °C	2,188 mm	7	0
2013	32.7 °C11 August 2013	1.2 °C27 January 2013	17.2 °C	1,844 mm	31	0
2012	30.8 °C17 August 2012	-0.3 °C3 February 2012	16.7 °C	2,358 mm	10	1
2011	31.1 °C11 August 2011	-1.2 °C16 January 2011	16.9 °C	2,391 mm	17	2
2010	32.0 °C1 August 2010	0.9 °C14 January 2010	17.3 °C	2,414 mm	22	0
2009	32.1 °C11 August 2009	1.6 °C24 January 2009	17.3 °C	1,818 mm	9	0
2008	31.9 °C30 July 2008	1.1 °C24 February 2008	17.1 °C	1,746 mm	18	0
2007	33.0 °C28 July 2007	1.9 °C3 February 2007	17.5 °C	1,753 mm	21	0
2006	33.4 °C8 August 2006	0.2 °C4 February 2006	17.2 °C	2,329 mm	19	0
2005	32.0 °C25 August 2005	-0.2 °C1 February 2005	16.7 °C	1,463 mm	14	2
2004	34.4 °C30 July 2004	-0.3 °C22 January 2004	17.6 °C	2,854 mm	17	1
2003	32.7 °C3 September 2003	-0.7 °C29 January 2003	17.1 °C	2,439 mm	19	2
2002	33.0 °C2 August 2002	0.7 °C2 January 2002	17.1 °C	1,699 mm	14	0
2001	32.5 °C25 July 2001	-1.3 °C15 January 2001	17.1 °C	1,883 mm	24	2
2000	33.2 °C22 July 2000	0.5 °C29 February 2000	17.1 °C	2,132 mm	22	0
1999	31.2 °C28 August 1999	-1.4 °C4 February 1999	17.1 °C	2,233 mm	11	2
1998	33.5 °C12 August 1998	-0.5 °C25 January 1998	18.2 °C	2,319 mm	37	1
1997	30.9 °C23 August 1997	-1.8 °C22 January 1997	16.8 °C	1,855 mm	10	1
1996	32.1 °C15 August 1996	-0.8 °C3 February 1996	16.3 °C	1,725 mm	20	2
1995	33.0 °C11 August 1995	0.3 °C31 January 1995	16.4 °C	1,487 mm	39	0
1994	33.1 °C16 July 1994	0.4 °C24 January 1994	17.4 °C	1,557 mm	28	0
1993	31.5 °C27 August 1993	1.3 °C3 February 1993	16.4 °C	2,717 mm	2	0
1992	32.0 °C27 July 1992	1.3 °C2 February 1992	16.8 °C	2,071 mm	14	0
1991	32.7 °C24 July 1991	-1.2 °C25 February 1991	17.2 °C	2,306 mm	18	3
1990	32.1 °C19 July 1990	-1.0 °C25 January 1990	17.3 °C	2,861 mm	24	3
1989	30.5 °C10 August 1989	1.8 °C29 January 1989	16.9 °C	2,137 mm	2	0
1988	30.8 °C11 July 1988	-0.7 °C4 February 1988	16.3 °C	1,764 mm	5	1
1987	30.7 °C30 July 1987	0.1 °C26 January 1987	16.8 °C	2,156 mm	3	0
1986	32.0 °C3 September 1986	-0.6 °C17 February 1986	16.0 °C	1,492 mm	10	4
1985	31.0 °C8 July 1985	-1.9 °C31 January 1985	16.4 °C	1,960 mm	7	4
1984	31.1 °C28 July 1984	-1.6 °C8 February 1984	15.8 °C	1,640 mm	9	9
1983	33.8 °C1 August 1983	-0.7 °C14 February 1983	16.6 °C	1,875 mm	24	2
1982	30.2 °C3 September 1982	-1.0 °C29 January 1982	16.3 °C	2,508 mm	1	2
1981	31.6 °C30 July 1981	-4.1 °C26 February 1981	16.0 °C	1,636 mm	12	3
1980	30.5 °C20 July 1980	-0.8 °C18 January 1980	16.2 °C	2,422 mm	2	4
1979	31.4 °C30 July 1979	-0.3 °C2 February 1979	16.6 °C	2,384 mm	12	1
1978	32.8 °C4 July 1978	-3.3 °C1 February 1978	16.6 °C	1,785 mm	11	2
1977	31.4 °C15 July 1977	-4.9 °C3 February 1977	16.7 °C	2,340 mm	18	13
1976	32.3 °C14 August 1976	-0.5 °C27 December 1976	15.9 °C	2,661 mm	6	2
1975	31.0 °C22 July 1975	0.2 °C29 January 1975	16.5 °C	2,906 mm	6	0
1974	32.6 °C16 August 1974	-0.6 °C12 February 1974	16.1 °C	2,305 mm	8	4
1973	32.1 °C21 July 1973	-0.1 °C25 February 1973	16.3 °C	2,003 mm	4	1
1972	31.9 °C22 July 1972	0.2 °C2 March 1972	16.4 °C	3,038 mm	7	0
1971	32.8 °C16 July 1971	0.2 °C11 February 1971	16.3 °C	2,036 mm	21	0
1970	32.4 °C21 July 1970	-0.7 °C18 January 1970	15.9 °C	2,568 mm	10	4
1969	33.8 °C12 August 1969	-0.3 °C16 January 1969	16.1 °C	1,945 mm	13	2
1968	31.7 °C11 August 1968	-1.2 °C12 February 1968	15.9 °C	2,268 mm	3	7
1967	33.3 °C16 August 1967	-2.8 °C16 January 1967	16.3 °C	1,911 mm	23	6
1966	31.3 °C31 July 1966	-0.8 °C20 January 1966	15.8 °C	2,388 mm	7	2
1965	31.7 °C22 August 1965	-1.1 °C3 February 1965	15.2 °C	2,008 mm	5	2
1964	32.3 °C16 July 1964	0.3 °C6 February 1964	16.9 °C	1,861 mm	24	0
1963	31.5 °C23 August 1963	-2.2 °C16 January 1963	16.0 °C	2,153 mm	11	9
1962	33.1 °C26 July 1962	0.5 °C17 February 1962	16.2 °C	2,074 mm	11	0
1961	31.7 °C6 August 1961	-0.4 °C17 January 1961	16.9 °C	2,335 mm	15	3
1960	32.8 °C20 August 1960	-0.8 °C25 January 1960	16.5 °C	1,962 mm	11	4
1959	31.7 °C24 July 1959	-1.9 °C18 January 1959	17.1 °C	2,436 mm	16	4
1958	30.6 °C31 July 1958	-0.6 °C4 January 1958	16.5 °C	1,760 mm	7	2
1957	30.2 °C19 July 1957	-0.6 °C11 February 1957	16.0 °C	2,489 mm	3	3
1956	33.3 °C4 August 1956	-0.5 °C9 January 1956	16.1 °C	2,320 mm	20	3
1955	31.2 °C8 August 1955	-0.8 °C22 February 1955	16.4 °C	1,829 mm	10	3
1954	31.0 °C9 August 1954	0.5 °C23 February 1954	16.5 °C	2,340 mm	5	0
1953	33.6 °C24 August 1953	0.1 °C10 February 1953	16.2 °C	1,926 mm	19	0
1952	31.7 °C1 August 1952	-1.1 °C6 February 1952	15.8 °C	1,785 mm	5	3
1951	30.5 °C29 July 1951	-0.7 °C22 January 1951	15.7 °C	1,959 mm	5	3
1950	30.5 °C21 August 1950	-0.3 °C7 January 1950	15.7 °C	2,071 mm	2	2
1949	29.8 °C20 August 1949	-0.3 °C17 January 1949	15.4 °C	1,983 mm	0	1
1948	30.2 °C4 September 1948	0.5 °C3 January 1948	16.0 °C	1,637 mm	1	0
1947	31.3 °C2 September 1947	-2.6 °C16 February 1947	14.7 °C	1,302 mm	5	15
1946	31.3 °C25 July 1946	0.4 °C17 January 1946	15.8 °C	1,491 mm	6	0
1945	30.1 °C5 September 1945	-1.5 °C19 January 1945	15.0 °C	2,464 mm	1	12
1944	30.0 °C30 August 1944	0.8 °C7 January 1944	15.6 °C	1,371 mm	1	0
1943	30.5 °C15 August 1943	-1.6 °C12 January 1943	15.1 °C	1,215 mm	1	5
1942	31.5 °C31 July 1942	-2.4 °C13 February 1942	15.4 °C	1,016 mm	8	9
1941	29.1 °C22 July 1941	-2.6 °C1 February 1941	15.5 °C	1,893 mm	0	10
1940	30.1 °C25 July 1940	-1.9 °C27 January 1940	14.8 °C	1,174 mm	1	18

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

20.7 °C

+1.2 °C

Hot days (≥ 30 °C)

49 d/yr

+35

Frost days (< 0 °C)

3 d/yr

Annual rainfall

1775 mm

-297 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	10.4 °C	+0.5 °C	23 mm	-35 mm
Feb	9.3 °C	-1.3 °C	41 mm	-42 mm
Mar	15.2 °C	+1.5 °C	127 mm	-8 mm
Apr	19.0 °C	+0.8 °C	114 mm	-72 mm
May	22.1 °C	+0.4 °C	318 mm	+110 mm
Jun	26.4 °C	+2.0 °C	285 mm	-27 mm
Jul	29.7 °C	+1.9 °C	223 mm	-69 mm
Aug	30.1 °C	+1.3 °C	156 mm	-85 mm
Sep	28.8 °C	+2.2 °C	201 mm	-47 mm
Oct	24.6 °C	+2.4 °C	217 mm	+62 mm
Nov	18.2 °C	+0.9 °C	44 mm	-54 mm
Dec	13.9 °C	+1.6 °C	27 mm	-31 mm

The year's extremes

Hottest day

33.0 °C

6 Jul 2025

Coldest day

-0.9 °C

10 Jan 2025

Wettest day

84.2 mm

24 May 2025

Windiest day

31.6 km/h

5 Feb 2025

Strongest gust

69.8 km/h

31 Oct 2025

Hottest feels-like

40.3 °C

2 Aug 2025

Coldest feels-like

-7.1 °C

8 Feb 2025

Sunniest day

14.0 h

1 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 Nankoku?

Nankoku has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 2,072 mm of precipitation per year.

What is the hottest day ever recorded in Nankoku?

The hottest day measured in Nankoku between 1940 and 2025 was 30 July 2024, reaching 34.8 °C.

What is the coldest day in Nankoku?

The coldest day measured in Nankoku between 1940 and 2025 was 3 February 1977, at -4.9 °C.

Does it snow in Nankoku?

Yes. Nankoku gets on average 1.6 cm of snow per year and has around 3 frost days.

Has the climate of Nankoku warmed?

Yes: Nankoku warmed by +2.2 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Nankoku?

The wettest day measured in Nankoku between 1940 and 2025 was 17 August 1975, with 216 mm of rain in 24 hours.

What was the windiest day in Nankoku?

The windiest day measured in Nankoku between 1940 and 2025 was 25 September 1964, with winds reaching 72.3 km/h.

What is the warmest month in Nankoku?

The warmest month in Nankoku is August (26.5 °C on average); the coldest is January (6.6 °C).

How much does it rain in Nankoku?

Nankoku receives on average 2,072 mm of precipitation per year, spread over about 145 rainy days.

Is it sunny in Nankoku?

Nankoku gets on average 9.0 hours of sunshine per day, roughly 3,285 hours per year over 1940-2025.

What is the biggest single-day snowfall in Nankoku?

The heaviest 24-hour snowfall measured in Nankoku between 1940 and 2025 was 15 February 1968, with 7.4 cm.

Are there tropical nights in Nankoku?

Yes: Nankoku has on average 105 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Nankoku?

In Nankoku, between 1940 and 2025, the highest apparent temperature reached 41.5 °C on 16 August 2024, and the lowest was -11.1 °C on 26 February 1981.

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