Ryūō, Japan climate

Cfa Humid subtropical

Ryūō has a seasonal mild-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 91°F, while the coldest is January averaging around 28°F at night. Precipitation totals about 46 inches a year and is strongly seasonal — September alone averages 7.0 inches while December barely receives 1.48 inches.

☀️ Summers

Hot

Highs near 91°F in August.

❄️ Winters

Cold

Lows near 28°F in January.

🌧️ Rain

Wet

About 46 in of rain a year.

Wettest in September

⛅ 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)

Ryūō climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	48	52	59	69	78	82	89	91	83	73	62	53
Avg temp (°F)	38	40	47	57	66	72	79	81	74	63	51	42
Avg low (°F)	28	31	38	47	57	65	72	74	67	55	43	33
Precipitation (in)	1.7	1.7	3.4	3.1	3.4	4.5	5.9	5.2	7.0	6.2	2.1	1.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	48	52	59	69	78	82
Avg temp (°F)	38	40	47	57	66	72
Avg low (°F)	28	31	38	47	57	65
Precipitation (in)	1.7	1.7	3.4	3.1	3.4	4.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	89	91	83	73	62	53
Avg temp (°F)	79	81	74	63	51	42
Avg low (°F)	72	74	67	55	43	33
Precipitation (in)	5.9	5.2	7.0	6.2	2.1	1.5

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	50	55	62	66	72	83	78	69	73	67	55	49
Relative humidity (%)	80	78	78	77	78	82	83	83	85	85	83	81
Wind speed (mph)	2.9	3.1	3.2	3.1	2.7	2.2	2.2	2.1	2.3	2.2	2.3	2.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	50	55	62	66	72	83
Relative humidity (%)	80	78	78	77	78	82
Wind speed (mph)	2.9	3.1	3.2	3.1	2.7	2.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	78	69	73	67	55	49
Relative humidity (%)	83	83	85	85	83	81
Wind speed (mph)	2.2	2.1	2.3	2.2	2.3	2.6

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kofu, about 5 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 →