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Minamiuonuma, Japan climate

Cfa Humid subtropical

Minamiuonuma has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 86°F, while the coldest is January averaging around 27°F at night. Around 100 inches of precipitation falls each year, peaking in December (15.7 inches) and easing off in May (4.0 inches).

☀️ Summers

Warm

Highs near 86°F in August.

❄️ Winters

Cold

Lows near 27°F in January.

🌧️ Rain

Very wet

About 100 in of rain a year.

Wettest in December

⛅ Sky & trend

Often grey

Overcast skies dominate much of the year.

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Minamiuonuma climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	37	39	46	60	72	78	83	86	78	67	56	43
Avg temp (°F)	32	32	37	48	61	68	75	77	69	58	47	37
Avg low (°F)	27	26	30	38	51	60	68	70	62	51	39	31
Precipitation (in)	15.4	10.3	7.0	4.4	4.0	5.3	8.7	7.2	6.6	6.6	9.2	15.7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	37	39	46	60	72	78
Avg temp (°F)	32	32	37	48	61	68
Avg low (°F)	27	26	30	38	51	60
Precipitation (in)	15.4	10.3	7.0	4.4	4.0	5.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	83	86	78	67	56	43
Avg temp (°F)	75	77	69	58	47	37
Avg low (°F)	68	70	62	51	39	31
Precipitation (in)	8.7	7.2	6.6	6.6	9.2	15.7

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	90	85	78	69	68	76	77	66	73	71	76	86
Relative humidity (%)	98	97	90	81	78	82	85	84	86	87	90	95
Wind speed (mph)	1.9	2.7	2.1	1.1	0.4	0.2	0.2	0.2	0.2	0.2	0.3	0.8

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	90	85	78	69	68	76
Relative humidity (%)	98	97	90	81	78	82
Wind speed (mph)	1.9	2.7	2.1	1.1	0.4	0.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	77	66	73	71	76	86
Relative humidity (%)	85	84	86	87	90	95
Wind speed (mph)	0.2	0.2	0.2	0.2	0.3	0.8

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Tokamachi, about 15 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →