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Monthly climate in Hamatonbetsu, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Hamatonbetsu features a humid continental climate (Dfb). Temperatures typically range between -5 °C (23 °F) and 18 °C (65 °F) through the year, but rarely can drop to -15 °C (4 °F) or can rise to as high as 25 °C (78 °F). The average annual precipitation amounts to about 1159 mm (45.6 inches) and receives 170 rainy days on the 1 mm (0.04 inches) threshold annually. Hamatonbetsu enjoys an average of 2848 hours of sunshine throughout the year, and daylight varies from 8 hours 48 minutes to 15 hours 33 minutes per day.

Monthly average temperatures in Hamatonbetsu, Japan

The warmest months in Hamatonbetsu are July, August and September, with daily mean temperatures ranging from 16 to 18 °C (61 - 65 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from -5 to -1 °C (23 - 30 °F) throughout the day. On average each year, Hamatonbetsu experiences 0 days above 25 °C (77.0 °F) and 113 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Hamatonbetsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum3°C
(39°F)		3°C
(38°F)		10°C
(51°F)		13°C
(56°F)		18°C
(65°F)		19°C
(66°F)		25°C
(77°F)		25°C
(77°F)		25°C
(78°F)		20°C
(69°F)		14°C
(58°F)		9°C
(48°F)
Mean maximum2°C
(36°F)		2°C
(36°F)		6°C
(44°F)		11°C
(51°F)		15°C
(60°F)		16°C
(61°F)		23°C
(74°F)		23°C
(74°F)		23°C
(73°F)		19°C
(66°F)		13°C
(56°F)		6°C
(44°F)
Average high-3°C
(27°F)		-4°C
(26°F)		1°C
(33°F)		5°C
(42°F)		10°C
(49°F)		12°C
(54°F)		17°C
(63°F)		19°C
(67°F)		18°C
(65°F)		13°C
(56°F)		7°C
(44°F)		-0°C
(32°F)
Daily mean-4°C
(25°F)		-5°C
(23°F)		-1°C
(31°F)		4°C
(39°F)		8°C
(46°F)		11°C
(52°F)		16°C
(61°F)		18°C
(65°F)		17°C
(63°F)		12°C
(54°F)		5°C
(41°F)		-1°C
(30°F)
Average low-6°C
(22°F)		-7°C
(20°F)		-2°C
(28°F)		2°C
(37°F)		6°C
(44°F)		10°C
(50°F)		15°C
(59°F)		17°C
(63°F)		16°C
(61°F)		11°C
(52°F)		4°C
(39°F)		-3°C
(27°F)
Mean minimum-10°C
(14°F)		-12°C
(10°F)		-7°C
(20°F)		-2°C
(29°F)		2°C
(36°F)		7°C
(44°F)		11°C
(52°F)		15°C
(59°F)		12°C
(54°F)		6°C
(44°F)		-2°C
(28°F)		-7°C
(19°F)
Minimum-12°C
(11°F)		-15°C
(4°F)		-10°C
(14°F)		-5°C
(23°F)		1°C
(34°F)		5°C
(41°F)		10°C
(50°F)		14°C
(58°F)		11°C
(53°F)		4°C
(40°F)		-5°C
(24°F)		-9°C
(16°F)

Compare climate in Hamatonbetsu with other places

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

Monthly average precipitation in Hamatonbetsu, Japan

Hamatonbetsu usually has the most precipitation in August, November and December, with an average of 20 rainy days and 143 mm (5.6 inches) of precipitation per month. The driest months in Hamatonbetsu are February, March and April. On average, 60 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Hamatonbetsu. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)71 (2.8)55 (2.2)70 (2.7)56 (2.2)83 (3.3)92 (3.6)100 (3.9)164 (6.5)76 (3.0)126 (5.0)136 (5.4)129 (5.1)
Average precipitation days (≥ 1 mm)18141181111101410152325

Monthly sunshine hours in Hamatonbetsu, Japan

The sunniest months in Hamatonbetsu are May, June and July, when the sun shines an average of 9 hours 49 minutes a day. Least sunny months in Hamatonbetsu: January, November and December receive an average of 4 hours 48 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Hamatonbetsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours115181241284292285325273279241167158
Mean daily daylight hours9h 10m10h 23m11h 55m13h 30m14h 51m15h 33m15h 12m14h 0m12h 29m10h 55m9h 32m8h 48m

Solar UV radiation in Hamatonbetsu, Japan

Hamatonbetsu experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure. January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Hamatonbetsu UV Index data.

Average daily maximum UV levels by month for Hamatonbetsu. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)235689987532