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Monthly climate in Helong, China

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Helong features a humid subtropical climate (Cfa). Temperatures typically range between 9 °C (48 °F) and 28 °C (83 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 39 °C (103 °F). The average annual precipitation amounts to about 1676 mm (66.0 inches) and receives 160 rainy days on the 1 mm (0.04 inches) threshold annually. Helong enjoys an average of 2871 hours of sunshine throughout the year, and daylight varies from 10 hours 29 minutes to 13 hours 45 minutes per day.

Monthly average temperatures in Helong, China

The warmest months in Helong are July, August and September, with daily mean temperatures ranging from 26 to 28 °C (78 - 83 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 9 to 10 °C (48 - 51 °F) throughout the day. On average each year, Helong experiences 152 days above 25 °C (77.0 °F) and 7 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Helong. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum25°C
(77°F)		27°C
(81°F)		29°C
(84°F)		31°C
(88°F)		34°C
(94°F)		35°C
(95°F)		39°C
(103°F)		38°C
(100°F)		36°C
(97°F)		35°C
(95°F)		28°C
(83°F)		26°C
(79°F)
Mean maximum23°C
(73°F)		24°C
(76°F)		27°C
(81°F)		30°C
(86°F)		33°C
(91°F)		34°C
(93°F)		36°C
(98°F)		36°C
(96°F)		35°C
(95°F)		32°C
(90°F)		26°C
(80°F)		23°C
(73°F)
Average high13°C
(57°F)		15°C
(59°F)		19°C
(67°F)		23°C
(74°F)		27°C
(81°F)		29°C
(85°F)		33°C
(92°F)		33°C
(91°F)		31°C
(87°F)		25°C
(77°F)		20°C
(68°F)		14°C
(58°F)
Daily mean9°C
(48°F)		10°C
(51°F)		15°C
(59°F)		18°C
(65°F)		23°C
(73°F)		25°C
(78°F)		28°C
(83°F)		28°C
(82°F)		26°C
(78°F)		20°C
(69°F)		15°C
(60°F)		10°C
(50°F)
Average low5°C
(42°F)		7°C
(44°F)		11°C
(53°F)		15°C
(59°F)		19°C
(67°F)		23°C
(73°F)		24°C
(76°F)		24°C
(75°F)		22°C
(72°F)		17°C
(62°F)		12°C
(53°F)		6°C
(43°F)
Mean minimum-1°C
(30°F)		0°C
(33°F)		4°C
(40°F)		8°C
(46°F)		14°C
(57°F)		19°C
(67°F)		22°C
(73°F)		22°C
(72°F)		17°C
(63°F)		10°C
(50°F)		6°C
(43°F)		-1°C
(31°F)
Minimum-4°C
(25°F)		-3°C
(26°F)		2°C
(36°F)		3°C
(39°F)		10°C
(51°F)		16°C
(62°F)		22°C
(71°F)		21°C
(70°F)		15°C
(58°F)		9°C
(48°F)		3°C
(37°F)		-1°C
(30°F)

Compare climate in Helong with other places

Compare temperature, precipitation, sunshine, UV index in Helong, China with other places around the world.

Monthly average precipitation in Helong, China

Helong usually has the most precipitation in March, May and June, with an average of 19 rainy days and 262 mm (10.3 inches) of precipitation per month. The driest months in Helong are January, October and December. On average, 42 mm (1.7 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Helong. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)47 (1.9)97 (3.8)186 (7.3)175 (6.9)247 (9.7)355 (14.0)136 (5.4)180 (7.1)104 (4.1)41 (1.6)70 (2.8)39 (1.5)
Average precipitation days (≥ 1 mm)71020161920141814796

Monthly sunshine hours in Helong, China

The sunniest months in Helong are July, August and September, when the sun shines an average of 9 hours 49 minutes a day. Least sunny months in Helong: January, February and March receive an average of 6 hours 22 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Helong. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours177203198225274235311310280225217209
Mean daily daylight hours10h 40m11h 14m12h 0m12h 47m13h 26m13h 45m13h 35m13h 1m12h 17m11h 30m10h 50m10h 29m

Solar UV radiation in Helong, China

Helong experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 13 - 13, which corresponds to the Extreme category of sun exposure. January, November and December are in the High / Very High exposure category. In these months, the maximum values of the UV index do not exceed 8. For more detailed information, check out our hourly Helong UV Index data.

Average daily maximum UV levels by month for Helong. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)7911111313131311986