Ōta, Japan climate

Cfa Humid subtropical

Ōta has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 32°C, while the coldest is January averaging around −2°C at night. Precipitation totals about 1269 mm a year and is strongly seasonal — July alone averages 201 mm while February barely receives 28 mm.

☀️ Summers

Hot

Highs near 32°C in August.

❄️ Winters

Cold

Lows near −2°C in January.

🌧️ Rain

Wet

About 1269 mm of rain a year.

Wettest in July

⛅ Sky & trend

Often cloudy

Cloudy skies 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)

Ōta climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	9	10	14	19	24	27	30	32	27	22	16	11
Avg temp (°C)	3	4	8	13	18	22	25	26	23	17	11	6
Avg low (°C)	−2	−1	2	8	13	17	21	22	19	12	6	1
Precipitation (mm)	33	28	64	84	110	153	201	180	179	155	53	28

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	9	10	14	19	24	27
Avg temp (°C)	3	4	8	13	18	22
Avg low (°C)	−2	−1	2	8	13	17
Precipitation (mm)	33	28	64	84	110	153

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	30	32	27	22	16	11
Avg temp (°C)	25	26	23	17	11	6
Avg low (°C)	21	22	19	12	6	1
Precipitation (mm)	201	180	179	155	53	28

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	55	60	65	71	82	81	72	75	68	55	49
Relative humidity (%)	82	80	77	75	76	80	82	82	83	83	82	82
Wind speed (m/s)	2.6	2.7	2.6	2.3	1.9	1.6	1.5	1.4	1.6	1.7	1.8	2.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	50	55	60	65	71	82
Relative humidity (%)	82	80	77	75	76	80
Wind speed (m/s)	2.6	2.7	2.6	2.3	1.9	1.6

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	81	72	75	68	55	49
Relative humidity (%)	82	82	83	83	82	82
Wind speed (m/s)	1.5	1.4	1.6	1.7	1.8	2.2

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kiryu, about 13 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 →