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Monthly climate in Joso, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Joso features a humid subtropical climate (Cfa). Temperatures typically range between 4 °C (40 °F) and 28 °C (82 °F) through the year, but rarely can drop to -8 °C (18 °F) or can rise to as high as 37 °C (99 °F). The average annual precipitation amounts to about 1447 mm (57.0 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually. Joso enjoys an average of 2916 hours of sunshine throughout the year, and daylight varies from 9 hours 45 minutes to 14 hours 32 minutes per day.

Monthly average temperatures in Joso, Japan

The warmest months in Joso are July, August and September, with daily mean temperatures ranging from 24 to 28 °C (75 - 82 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 4 to 7 °C (40 - 44 °F) throughout the day. On average each year, Joso experiences 99 days above 25 °C (77.0 °F) and 36 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Joso. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(63°F)		21°C
(70°F)		24°C
(75°F)		28°C
(83°F)		33°C
(91°F)		33°C
(92°F)		37°C
(99°F)		37°C
(99°F)		35°C
(95°F)		32°C
(90°F)		24°C
(75°F)		21°C
(70°F)
Mean maximum15°C
(60°F)		17°C
(64°F)		22°C
(72°F)		26°C
(79°F)		30°C
(86°F)		30°C
(86°F)		34°C
(94°F)		36°C
(97°F)		33°C
(92°F)		29°C
(85°F)		22°C
(72°F)		18°C
(65°F)
Average high9°C
(49°F)		11°C
(51°F)		15°C
(59°F)		19°C
(66°F)		24°C
(75°F)		26°C
(79°F)		29°C
(85°F)		32°C
(89°F)		27°C
(81°F)		22°C
(71°F)		17°C
(63°F)		11°C
(53°F)
Daily mean4°C
(40°F)		6°C
(42°F)		10°C
(50°F)		14°C
(58°F)		19°C
(67°F)		22°C
(72°F)		26°C
(79°F)		28°C
(82°F)		24°C
(75°F)		18°C
(65°F)		13°C
(55°F)		7°C
(44°F)
Average low-0°C
(32°F)		1°C
(34°F)		5°C
(41°F)		10°C
(50°F)		15°C
(60°F)		19°C
(66°F)		23°C
(74°F)		25°C
(77°F)		21°C
(69°F)		15°C
(59°F)		9°C
(48°F)		2°C
(37°F)
Mean minimum-5°C
(23°F)		-4°C
(26°F)		-2°C
(29°F)		3°C
(38°F)		8°C
(46°F)		16°C
(60°F)		19°C
(67°F)		20°C
(68°F)		15°C
(60°F)		9°C
(48°F)		2°C
(36°F)		-3°C
(28°F)
Minimum-8°C
(18°F)		-5°C
(23°F)		-3°C
(26°F)		1°C
(33°F)		6°C
(42°F)		13°C
(56°F)		17°C
(63°F)		17°C
(62°F)		13°C
(55°F)		6°C
(44°F)		-1°C
(31°F)		-4°C
(26°F)

Compare climate in Joso with other places

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

Monthly average precipitation in Joso, Japan

Joso usually has the most precipitation in July, September and October, with an average of 16 rainy days and 211 mm (8.3 inches) of precipitation per month. The driest months in Joso are January, February and December. On average, 45 mm (1.8 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Joso. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)42 (1.6)39 (1.5)123 (4.9)109 (4.3)121 (4.8)142 (5.6)225 (8.9)111 (4.4)171 (6.7)238 (9.4)72 (2.8)54 (2.1)
Average precipitation days (≥ 1 mm)57111112151914171486

Monthly sunshine hours in Joso, Japan

The sunniest months in Joso are April, May and August, when the sun shines an average of 9 hours 4 minutes a day. Least sunny months in Joso: January, October and December receive an average of 6 hours 44 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Joso. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours191237259273281259233279233206231229
Mean daily daylight hours10h 0m10h 51m11h 57m13h 6m14h 3m14h 32m14h 18m13h 27m12h 22m11h 14m10h 15m9h 45m

Solar UV radiation in Joso, Japan

Joso experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure. January, February 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 Joso UV Index data.

Average daily maximum UV levels by month for Joso. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)3579101111109753