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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 10 °C (50 °F) and 29 °C (84 °F) through the year, but rarely can drop to -4 °C (25 °F) or can rise to as high as 38 °C (101 °F). The average annual precipitation amounts to about 1605 mm (63.2 inches) and receives 151 rainy days on the 1 mm (0.04 inches) threshold annually. Helong enjoys an average of 2906 hours of sunshine throughout the year, and daylight varies from 10 hours 31 minutes to 13 hours 43 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 29 °C (80 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 10 to 11 °C (50 - 52 °F) throughout the day. On average each year, Helong experiences 161 days above 25 °C (77.0 °F) and 4 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
(78°F)		27°C
(81°F)		30°C
(86°F)		32°C
(89°F)		35°C
(95°F)		35°C
(95°F)		38°C
(101°F)		38°C
(100°F)		38°C
(100°F)		36°C
(97°F)		29°C
(84°F)		26°C
(79°F)
Mean maximum23°C
(74°F)		25°C
(78°F)		28°C
(82°F)		30°C
(86°F)		33°C
(91°F)		34°C
(93°F)		37°C
(98°F)		36°C
(97°F)		35°C
(96°F)		33°C
(92°F)		27°C
(81°F)		23°C
(74°F)
Average high14°C
(58°F)		15°C
(60°F)		20°C
(68°F)		23°C
(74°F)		28°C
(82°F)		30°C
(86°F)		34°C
(93°F)		33°C
(92°F)		32°C
(89°F)		26°C
(78°F)		21°C
(69°F)		15°C
(59°F)
Daily mean10°C
(50°F)		11°C
(52°F)		16°C
(61°F)		19°C
(67°F)		23°C
(75°F)		26°C
(79°F)		29°C
(84°F)		28°C
(83°F)		26°C
(80°F)		21°C
(70°F)		16°C
(61°F)		10°C
(51°F)
Average low6°C
(43°F)		7°C
(46°F)		12°C
(54°F)		15°C
(60°F)		20°C
(68°F)		23°C
(74°F)		25°C
(77°F)		25°C
(77°F)		23°C
(73°F)		17°C
(63°F)		12°C
(54°F)		7°C
(45°F)
Mean minimum-1°C
(30°F)		1°C
(34°F)		5°C
(41°F)		8°C
(47°F)		14°C
(58°F)		20°C
(67°F)		23°C
(74°F)		23°C
(74°F)		18°C
(64°F)		10°C
(51°F)		7°C
(44°F)		0°C
(33°F)
Minimum-4°C
(25°F)		-4°C
(26°F)		2°C
(36°F)		3°C
(38°F)		11°C
(52°F)		17°C
(62°F)		22°C
(71°F)		22°C
(72°F)		15°C
(59°F)		8°C
(47°F)		2°C
(37°F)		-1°C
(31°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 251 mm (9.9 inches) of precipitation per month. The driest months in Helong are January, October and December. On average, 40 mm (1.6 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)45 (1.8)100 (3.9)182 (7.2)180 (7.1)251 (9.9)319 (12.6)123 (4.8)161 (6.3)95 (3.8)43 (1.7)74 (2.9)32 (1.3)
Average precipitation days (≥ 1 mm)6918151920141712786

Monthly sunshine hours in Helong, China

The sunniest months in Helong are May, July and August, when the sun shines an average of 9 hours 42 minutes a day. Least sunny months in Helong: January, February and March receive an average of 6 hours 31 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 hours185208199223281237311310281229221216
Mean daily daylight hours10h 41m11h 15m12h 0m12h 46m13h 24m13h 43m13h 34m13h 0m12h 16m11h 31m10h 51m10h 31m

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)79121113131313111086