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Monthly climate in Koshu, Yamanashi, Japan

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Koshu features a humid continental climate (Dfb).Temperatures typically range between -1 °C (31 °F) and 23 °C (73 °F) through the year, but rarely can drop to -17 °C (2 °F) or can rise to as high as 33 °C (91 °F).The average annual precipitation amounts to about 1864 mm (73.4 inches) and receives 183 rainy days on the 1 mm (0.04 inches) threshold annually.Koshu enjoys an average of 2877 hours of sunshine throughout the year, and daylight varies from 9 hours 46 minutes to 14 hours 31 minutes per day.

Monthly average temperatures in Koshu, Yamanashi, Japan §

The warmest months in Koshu are July, August and September, with daily mean temperatures ranging from 18 to 23 °C (65 - 73 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -1 to 2 °C (31 - 36 °F) throughout the day. On average each year, Koshu experiences 43 days above 25 °C (77.0 °F) and 101 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Koshu, Yamanashi, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 11°C
(52°F)		 17°C
(63°F)		 21°C
(70°F)		 25°C
(78°F)		 28°C
(82°F)		 28°C
(82°F)		 32°C
(90°F)		 33°C
(91°F)		 31°C
(87°F)		 27°C
(80°F)		 19°C
(66°F)		 18°C
(65°F)
Mean maximum 9°C
(49°F)		 13°C
(56°F)		 18°C
(65°F)		 22°C
(72°F)		 27°C
(80°F)		 25°C
(78°F)		 30°C
(86°F)		 31°C
(88°F)		 28°C
(83°F)		 25°C
(77°F)		 18°C
(64°F)		 13°C
(55°F)
Average high 4°C
(39°F)		 5°C
(42°F)		 10°C
(50°F)		 14°C
(58°F)		 19°C
(67°F)		 22°C
(71°F)		 25°C
(77°F)		 27°C
(80°F)		 22°C
(72°F)		 17°C
(63°F)		 12°C
(55°F)		 7°C
(44°F)
Daily mean -1°C
(31°F)		 0°C
(33°F)		 5°C
(41°F)		 9°C
(48°F)		 14°C
(58°F)		 17°C
(63°F)		 21°C
(70°F)		 23°C
(73°F)		 18°C
(65°F)		 13°C
(55°F)		 7°C
(45°F)		 2°C
(36°F)
Average low -4°C
(24°F)		 -4°C
(25°F)		 -0°C
(32°F)		 4°C
(39°F)		 10°C
(49°F)		 14°C
(57°F)		 18°C
(65°F)		 19°C
(67°F)		 15°C
(60°F)		 10°C
(49°F)		 3°C
(37°F)		 -2°C
(29°F)
Mean minimum -10°C
(14°F)		 -10°C
(15°F)		 -5°C
(23°F)		 -3°C
(28°F)		 2°C
(36°F)		 10°C
(49°F)		 15°C
(59°F)		 16°C
(60°F)		 10°C
(51°F)		 3°C
(38°F)		 -2°C
(28°F)		 -7°C
(20°F)
Minimum -17°C
(2°F)		 -12°C
(11°F)		 -7°C
(21°F)		 -4°C
(25°F)		 0°C
(33°F)		 7°C
(44°F)		 13°C
(56°F)		 12°C
(55°F)		 9°C
(49°F)		 2°C
(35°F)		 -4°C
(26°F)		 -8°C
(17°F)

Compare climate in Koshu with other places

Compare temperature, precipitation, sunshine, UV index in Koshu, Yamanashi, Japan with other places around the world.

Monthly average precipitation in Koshu, Yamanashi, Japan §

Koshu usually has the most precipitation in July, September and October, with an average of 21 rainy days and 284 mm (11.2 inches) of precipitation per month.The driest months in Koshu are January, November and December. On average, 52 mm (2.0 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Koshu, Yamanashi, Japan.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 48 (1.9) 58 (2.3) 144 (5.7) 138 (5.4) 148 (5.8) 179 (7.1) 320 (12.6) 190 (7.5) 208 (8.2) 324 (12.8) 56 (2.2) 52 (2.1)
Average precipitation days (≥ 1 mm) 6 9 13 15 15 19 24 23 22 19 10 8

Monthly sunshine hours in Koshu, Yamanashi, Japan §

The sunniest months in Koshu are April, May and August, when the sun shines an average of 9 hours 0 minutes a day.Least sunny months in Koshu: January, July and October receive an average of 6 hours 36 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Koshu, Yamanashi, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 191 232 258 270 282 255 219 275 228 203 227 232
Mean daily daylight hours 10h 1m 10h 52m 11h 58m 13h 5m 14h 2m 14h 31m 14h 16m 13h 27m 12h 22m 11h 15m 10h 16m 9h 46m

Solar UV radiation in Koshu, Yamanashi, Japan §

Koshu experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Koshu UV Index data.

Average daily maximum UV levels by month for Koshu, Yamanashi, Japan.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 8 10 11 11 12 11 10 7 5 4