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Yamagata, Japan climate

Cfa Humid subtropical

Yamagata has a strongly seasonal cool-temperate climate (Humid subtropical, Köppen Cfa). The hottest month is August with an average daily high near 31°C, while the coldest is January averaging around −3°C at night. Around 1207 mm of precipitation falls each year, peaking in July (187 mm) and easing off in February (63 mm).

☀️ Summers

Warm

Highs near 31°C in August.

❄️ Winters

Cold

Lows near −3°C in January.

🌧️ Rain

Wet

About 1207 mm of rain a year.

Wettest in July

⛅ 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)

Yamagata climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	3	4	9	16	23	26	29	31	26	20	13	6
Avg temp (°C)	0	0	4	10	16	20	24	25	21	14	8	2
Avg low (°C)	−3	−3	0	5	11	16	20	21	17	10	4	−1
Precipitation (mm)	88	63	72	64	74	105	187	153	124	105	74	97

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	3	4	9	16	23	26
Avg temp (°C)	0	0	4	10	16	20
Avg low (°C)	−3	−3	0	5	11	16
Precipitation (mm)	88	63	72	64	74	105

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	29	31	26	20	13	6
Avg temp (°C)	24	25	21	14	8	2
Avg low (°C)	20	21	17	10	4	−1
Precipitation (mm)	187	153	124	105	74	97

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	77	75	73	71	71	77	80	71	76	72	74	79
Relative humidity (%)	95	93	87	82	81	83	86	85	87	87	89	93
Wind speed (m/s)	1.9	2.2	2.0	1.4	0.9	0.7	0.7	0.7	0.7	0.8	0.9	1.3

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	77	75	73	71	71	77
Relative humidity (%)	95	93	87	82	81	83
Wind speed (m/s)	1.9	2.2	2.0	1.4	0.9	0.7

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	80	71	76	72	74	79
Relative humidity (%)	86	85	87	87	89	93
Wind speed (m/s)	0.7	0.7	0.7	0.8	0.9	1.3

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Yamagata, about 3 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 →