Nagaoka climate — normals and trends

Q: What is the climate of Nagaoka?

Nagaoka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,744 mm of precipitation per year.

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

The hottest day measured in Nagaoka between 1940 and 2025 was 29 July 2018, reaching 40.4 °C.

Q: What is the coldest day in Nagaoka?

The coldest day measured in Nagaoka between 1940 and 2025 was 15 February 1942, at -10.8 °C.

Q: Does it snow in Nagaoka?

Yes. Nagaoka gets on average 193.3 cm of snow per year and has around 63 frost days.

Q: Has the climate of Nagaoka warmed?

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

Q: What is the wettest day in Nagaoka?

The wettest day measured in Nagaoka between 1940 and 2025 was 27 August 1967, with 151 mm of rain in 24 hours.

Q: What was the windiest day in Nagaoka?

The windiest day measured in Nagaoka between 1940 and 2025 was 16 September 1961, with winds reaching 65.7 km/h.

Q: What is the warmest month in Nagaoka?

The warmest month in Nagaoka is August (26.3 °C on average); the coldest is January (1.5 °C).

Q: How much does it rain in Nagaoka?

Nagaoka receives on average 1,744 mm of precipitation per year, spread over about 212 rainy days.

Q: Is it sunny in Nagaoka?

Nagaoka gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.

Nagaoka (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 13.2 °C and it receives 1,744 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 (26.3 °C on average) and the coldest is January (1.5 °C). Rainfall peaks in July.

Nagaoka averages 63 frost days, 35 hot days (≥ 30 °C) and 212 rainy days per year.

Nagaoka 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 92 to 34 per year over the period.

The hottest day of the period reached 40.4 °C (on 29 July 2018) and the coldest -10.8 °C (on 15 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

NagaokaNiigata

coords: 37.45°, 138.85°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJulyDriest monthApril

Mean daily temperature

13.2°C

Average daily high

17.2°C

Average daily low

9.4°C

Annual rainfall

1,744mm

Sunshine / day

8.5h

Mean relative humidity

77%

Average peak wind

14.6km/h

Seasonal range

24.8°C

Frost days (< 0 °C)

63 d/yr

Hot days (≥ 30 °C)

35 d/yr

Rainy days (≥ 1 mm)

212 d/yr

Annual snowfall

193.3 cm

Average feels-like high

16.9 °C

Average feels-like low

8.1 °C

Average peak gust

35.6 km/h

Tropical nights (≥ 20 °C)

62 d/yr

Solar radiation

14.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.7 °C

since 1940

+0.3 °C per decade · r² = 0.67 · 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

40.4 °C

29 July 2018

Coldest day

-10.8 °C

15 February 1942

Wettest day

151 mm

27 August 1967

Windiest day

65.7 km/h

16 September 1961

Strongest gust

155.5 km/h

16 September 1961

Hottest feels-like

45.6 °C

17 August 2006

Coldest feels-like

-15.6 °C

12 February 1942

Snowiest day

30.7 cm

15 February 2014

Sunniest day

14.1 h

11 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.8 °C1 August 2025	-4.0 °C19 January 2025	14.3 °C	1,912 mm	71	51
2024	38.0 °C23 August 2024	-6.3 °C11 January 2024	15.1 °C	1,953 mm	64	29
2023	40.0 °C10 August 2023	-5.8 °C4 February 2023	15.5 °C	1,701 mm	70	39
2022	36.6 °C24 June 2022	-3.2 °C6 January 2022	14.6 °C	1,832 mm	59	45
2021	37.5 °C3 August 2021	-7.9 °C21 January 2021	14.5 °C	1,843 mm	40	53
2020	37.6 °C3 September 2020	-6.0 °C12 February 2020	14.7 °C	2,089 mm	44	20
2019	39.1 °C15 August 2019	-5.5 °C15 February 2019	14.7 °C	1,764 mm	41	32
2018	40.4 °C29 July 2018	-10.4 °C15 January 2018	14.6 °C	1,539 mm	54	54
2017	37.8 °C7 August 2017	-4.9 °C18 December 2017	13.7 °C	1,973 mm	36	44
2016	35.1 °C7 August 2016	-6.3 °C8 February 2016	14.7 °C	1,602 mm	47	31
2015	38.3 °C13 July 2015	-3.8 °C21 January 2015	14.6 °C	1,353 mm	36	32
2014	37.2 °C5 August 2014	-8.6 °C24 January 2014	13.8 °C	1,573 mm	34	58
2013	34.8 °C31 August 2013	-7.3 °C27 February 2013	13.7 °C	2,075 mm	37	57
2012	37.7 °C17 September 2012	-7.0 °C25 December 2012	13.8 °C	1,574 mm	58	66
2011	38.2 °C20 July 2011	-6.9 °C21 December 2011	13.7 °C	1,611 mm	57	79
2010	36.8 °C5 August 2010	-6.4 °C18 February 2010	14.2 °C	1,801 mm	55	52
2009	34.7 °C15 July 2009	-6.1 °C22 February 2009	13.9 °C	1,544 mm	23	45
2008	35.3 °C13 August 2008	-5.1 °C22 February 2008	14.2 °C	1,455 mm	45	52
2007	38.3 °C12 August 2007	-5.0 °C5 February 2007	14.3 °C	1,522 mm	38	23
2006	38.4 °C17 August 2006	-6.9 °C10 January 2006	13.8 °C	1,675 mm	37	51
2005	35.8 °C21 June 2005	-5.4 °C13 February 2005	13.8 °C	1,705 mm	50	65
2004	38.4 °C5 July 2004	-7.7 °C11 February 2004	14.5 °C	1,933 mm	46	49
2003	35.5 °C13 September 2003	-6.4 °C3 January 2003	13.7 °C	1,441 mm	22	54
2002	37.5 °C1 September 2002	-4.4 °C10 February 2002	13.9 °C	1,907 mm	40	39
2001	34.4 °C15 July 2001	-5.8 °C14 January 2001	13.8 °C	1,652 mm	36	57
2000	37.7 °C30 July 2000	-8.8 °C27 January 2000	14.1 °C	1,658 mm	55	53
1999	38.4 °C7 August 1999	-7.3 °C4 February 1999	14.1 °C	1,836 mm	43	51
1998	36.0 °C27 July 1998	-6.5 °C19 February 1998	14.4 °C	1,949 mm	23	40
1997	36.3 °C9 August 1997	-4.9 °C22 January 1997	13.7 °C	1,685 mm	34	42
1996	36.4 °C14 August 1996	-8.3 °C21 February 1996	12.8 °C	1,692 mm	34	58
1995	35.6 °C24 July 1995	-6.8 °C17 January 1995	13.2 °C	1,794 mm	28	52
1994	38.3 °C11 August 1994	-5.1 °C17 December 1994	14.5 °C	1,309 mm	55	52
1993	34.2 °C4 September 1993	-4.2 °C23 January 1993	13.1 °C	1,827 mm	8	34
1992	36.3 °C25 August 1992	-7.1 °C12 February 1992	13.7 °C	1,462 mm	31	39
1991	35.8 °C19 August 1991	-6.6 °C14 February 1991	13.9 °C	1,847 mm	26	40
1990	37.9 °C22 August 1990	-7.3 °C21 January 1990	14.8 °C	1,395 mm	52	34
1989	36.1 °C27 July 1989	-3.0 °C15 February 1989	14.1 °C	1,579 mm	31	24
1988	34.6 °C14 August 1988	-7.3 °C7 January 1988	12.8 °C	1,826 mm	26	52
1987	36.1 °C31 August 1987	-7.8 °C2 February 1987	13.8 °C	1,401 mm	39	52
1986	37.4 °C29 August 1986	-7.8 °C20 January 1986	12.7 °C	1,581 mm	29	64
1985	37.4 °C30 August 1985	-8.9 °C16 December 1985	13.2 °C	1,933 mm	50	79
1984	37.0 °C22 August 1984	-5.7 °C12 February 1984	12.6 °C	1,543 mm	44	93
1983	35.5 °C14 August 1983	-7.4 °C28 December 1983	13.2 °C	2,069 mm	28	58
1982	36.8 °C28 August 1982	-6.2 °C17 January 1982	13.5 °C	1,552 mm	19	60
1981	35.6 °C30 July 1981	-4.5 °C27 February 1981	12.5 °C	1,873 mm	33	59
1980	35.0 °C11 September 1980	-5.0 °C12 January 1980	12.5 °C	1,947 mm	10	59
1979	35.4 °C27 August 1979	-6.5 °C4 March 1979	13.7 °C	1,902 mm	22	62
1978	36.9 °C2 August 1978	-9.2 °C17 February 1978	13.2 °C	1,782 mm	49	63
1977	36.3 °C4 August 1977	-6.7 °C19 January 1977	12.9 °C	1,624 mm	24	77
1976	34.1 °C25 July 1976	-7.5 °C14 February 1976	12.3 °C	2,279 mm	16	67
1975	35.6 °C18 August 1975	-7.4 °C18 February 1975	13.3 °C	1,837 mm	45	76
1974	34.5 °C2 September 1974	-5.7 °C21 January 1974	12.6 °C	1,766 mm	28	75
1973	36.4 °C18 August 1973	-5.0 °C28 January 1973	13.2 °C	1,671 mm	47	75
1972	35.0 °C25 July 1972	-7.6 °C26 February 1972	13.5 °C	2,085 mm	32	51
1971	36.8 °C6 August 1971	-7.2 °C24 December 1971	12.5 °C	2,142 mm	22	80
1970	35.7 °C2 September 1970	-7.9 °C13 March 1970	12.6 °C	1,791 mm	40	92
1969	33.7 °C4 August 1969	-9.2 °C31 December 1969	12.5 °C	2,057 mm	24	90
1968	36.1 °C27 July 1968	-7.3 °C24 February 1968	13.1 °C	1,706 mm	34	62
1967	34.6 °C10 August 1967	-9.2 °C15 February 1967	13.1 °C	1,800 mm	39	81
1966	34.0 °C23 August 1966	-6.9 °C31 December 1966	12.1 °C	1,864 mm	33	89
1965	35.4 °C6 August 1965	-10.0 °C28 December 1965	11.6 °C	1,835 mm	17	91
1964	35.2 °C22 August 1964	-6.6 °C6 January 1964	13.3 °C	2,144 mm	35	50
1963	36.2 °C10 August 1963	-6.3 °C2 January 1963	13.0 °C	1,894 mm	28	74
1962	37.5 °C3 August 1962	-5.4 °C17 January 1962	13.4 °C	1,610 mm	41	52
1961	35.2 °C4 September 1961	-6.2 °C13 January 1961	13.8 °C	2,209 mm	45	69
1960	36.6 °C29 August 1960	-6.8 °C17 February 1960	13.3 °C	1,910 mm	37	61
1959	34.4 °C8 August 1959	-7.2 °C9 January 1959	13.7 °C	1,914 mm	19	52
1958	33.4 °C18 August 1958	-7.4 °C1 March 1958	13.3 °C	1,908 mm	27	60
1957	36.3 °C21 August 1957	-6.9 °C3 February 1957	12.7 °C	1,706 mm	22	70
1956	35.5 °C9 September 1956	-7.1 °C27 February 1956	12.6 °C	1,961 mm	25	75
1955	36.3 °C9 August 1955	-7.4 °C7 February 1955	13.6 °C	1,828 mm	47	49
1954	36.0 °C18 August 1954	-6.7 °C13 January 1954	13.1 °C	1,540 mm	30	60
1953	33.1 °C10 August 1953	-6.6 °C28 January 1953	12.7 °C	2,192 mm	15	61
1952	32.1 °C19 August 1952	-9.5 °C10 January 1952	11.2 °C	1,849 mm	10	106
1951	37.0 °C19 August 1951	-10.2 °C6 March 1951	12.0 °C	1,378 mm	32	84
1950	36.0 °C20 August 1950	-9.1 °C6 January 1950	12.7 °C	1,444 mm	50	94
1949	35.2 °C15 August 1949	-8.2 °C12 February 1949	12.2 °C	1,651 mm	31	83
1948	33.3 °C14 August 1948	-8.9 °C5 February 1948	12.4 °C	1,435 mm	23	84
1947	32.7 °C19 July 1947	-8.9 °C28 January 1947	10.9 °C	1,692 mm	20	114
1946	34.9 °C29 July 1946	-7.7 °C2 March 1946	12.1 °C	1,489 mm	33	101
1945	33.3 °C25 August 1945	-9.5 °C22 February 1945	11.3 °C	2,259 mm	16	108
1944	32.5 °C22 August 1944	-10.8 °C7 January 1944	12.1 °C	1,537 mm	25	107
1943	33.6 °C22 July 1943	-10.6 °C10 January 1943	11.8 °C	1,313 mm	41	117
1942	35.4 °C1 September 1942	-10.8 °C15 February 1942	12.0 °C	1,271 mm	47	99
1941	35.1 °C24 August 1941	-10.6 °C12 February 1941	11.5 °C	1,416 mm	11	107
1940	32.1 °C14 July 1940	-9.4 °C17 January 1940	11.4 °C	1,528 mm	18	109

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

18.4 °C

+1.2 °C

Hot days (≥ 30 °C)

71 d/yr

+36

Frost days (< 0 °C)

51 d/yr

-12

Annual rainfall

1912 mm

+168 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	5.3 °C	+1.0 °C	214 mm	+40 mm
Feb	3.9 °C	-1.0 °C	177 mm	+45 mm
Mar	10.2 °C	+1.3 °C	108 mm	-14 mm
Apr	15.8 °C	-0.1 °C	112 mm	+17 mm
May	21.1 °C	-0.3 °C	118 mm	+20 mm
Jun	26.6 °C	+1.5 °C	141 mm	+14 mm
Jul	33.5 °C	+4.8 °C	18 mm	-193 mm
Aug	31.6 °C	+1.0 °C	231 mm	+71 mm
Sep	28.4 °C	+2.5 °C	193 mm	+38 mm
Oct	20.2 °C	+0.5 °C	194 mm	+56 mm
Nov	14.0 °C	+0.4 °C	192 mm	+47 mm
Dec	9.0 °C	+1.5 °C	215 mm	+27 mm

The year's extremes

Hottest day

36.8 °C

1 Aug 2025

Coldest day

-4.0 °C

19 Jan 2025

Wettest day

52.4 mm

12 Aug 2025

Windiest day

40.7 km/h

29 Apr 2025

Strongest gust

87.5 km/h

16 Apr 2025

Hottest feels-like

42.0 °C

25 Aug 2025

Coldest feels-like

-8.5 °C

19 Jan 2025

Snowiest day

11.1 cm

8 Jan 2025

Sunniest day

14.0 h

18 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 Nagaoka?

Nagaoka has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 13.2 °C and it receives 1,744 mm of precipitation per year.

What is the hottest day ever recorded in Nagaoka?

The hottest day measured in Nagaoka between 1940 and 2025 was 29 July 2018, reaching 40.4 °C.

What is the coldest day in Nagaoka?

The coldest day measured in Nagaoka between 1940 and 2025 was 15 February 1942, at -10.8 °C.

Does it snow in Nagaoka?

Yes. Nagaoka gets on average 193.3 cm of snow per year and has around 63 frost days.

Has the climate of Nagaoka warmed?

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

What is the wettest day in Nagaoka?

The wettest day measured in Nagaoka between 1940 and 2025 was 27 August 1967, with 151 mm of rain in 24 hours.

What was the windiest day in Nagaoka?

The windiest day measured in Nagaoka between 1940 and 2025 was 16 September 1961, with winds reaching 65.7 km/h.

What is the warmest month in Nagaoka?

The warmest month in Nagaoka is August (26.3 °C on average); the coldest is January (1.5 °C).

How much does it rain in Nagaoka?

Nagaoka receives on average 1,744 mm of precipitation per year, spread over about 212 rainy days.

Is it sunny in Nagaoka?

Nagaoka gets on average 8.5 hours of sunshine per day, roughly 3,103 hours per year over 1940-2025.

What is the biggest single-day snowfall in Nagaoka?

The heaviest 24-hour snowfall measured in Nagaoka between 1940 and 2025 was 15 February 2014, with 30.7 cm.

Are there tropical nights in Nagaoka?

Yes: Nagaoka has on average 62 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Nagaoka?

In Nagaoka, between 1940 and 2025, the highest apparent temperature reached 45.6 °C on 17 August 2006, and the lowest was -15.6 °C on 12 February 1942.

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