Heshan climate
Heshan (Hunan, China) has a humid subtropical climate (Köppen Cfa). The average temperature over the year is 18 °C64 °F, and about 1,442 mm57 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Heshan climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin | Frost days |
|---|---|---|---|---|---|
| Jan | 949 | 032 | 540 | 632.5 | 15 |
| Feb | 1355 | 337 | 846 | 843.3 | 7 |
| Mar | 1864 | 745 | 1355 | 1325.2 | 1 |
| Apr | 2374 | 1355 | 1865 | 1666.5 | 0 |
| May | 2781 | 1864 | 2373 | 2038.0 | 0 |
| Jun | 3086 | 2272 | 2679 | 2158.5 | 0 |
| Jul | 3290 | 2576 | 2883 | 1556.1 | 0 |
| Aug | 3290 | 2475 | 2882 | 1194.7 | 0 |
| Sep | 2985 | 2067 | 2576 | 863.4 | 0 |
| Oct | 2476 | 1457 | 1966 | 753.0 | 0 |
| Nov | 1864 | 745 | 1355 | 933.6 | 0 |
| Dec | 1152 | 134 | 643 | 512.0 | 9 |
| Year | 3290 | 032 | 1864 | 1,44257 | 32 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total. Frost days are for the whole grid cell.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 78% | 75% | 1.8 | 10:30 |
| Feb | 79% | 78% | 2.1 | 11:09 |
| Mar | 79% | 76% | 2.8 | 11:55 |
| Apr | 79% | 77% | 3.6 | 12:49 |
| May | 80% | 78% | 3.9 | 13:34 |
| Jun | 83% | 80% | 4.2 | 13:57 |
| Jul | 83% | 71% | 5.2 | 13:47 |
| Aug | 81% | 68% | 4.7 | 13:09 |
| Sep | 77% | 68% | 3.7 | 12:17 |
| Oct | 74% | 68% | 2.9 | 11:25 |
| Nov | 76% | 66% | 2.3 | 10:41 |
| Dec | 76% | 67% | 1.9 | 10:20 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Heshan is like
The warmest month is July, with an average high of 32 °C90 °F and a low of 25 °C76 °F. The coldest is January, when highs average 9 °C49 °F and lows 0 °C32 °F. Seasons are strongly marked: the warmest month is on average 23.9 °C43.1 °F warmer than the coldest.
It is wet, with about 1,442 mm57 in of precipitation per year. The wettest three-month stretch is April–June, which brings 41% of the annual total. The wettest month is June (215 mm8.5 in), the driest is December (51 mm2.0 in).
Relative humidity ranges from 74% in October to 83% in June. The clearest skies (lowest average cloud amount, 66%) are typical of November. Average wind speed near the ground ranges from 7 km/h (4 mph) in June to 9 km/h (6 mph) in February. Daylight lasts from about 10.3 hours in December to 14.0 hours in June.
Best time to visit Heshan
Based on these averages, the most comfortable months for sightseeing and outdoor activities are October: average highs of 24 °C76 °F to 24 °C76 °F with 75 mm3.0 in to 75 mm3.0 in of precipitation per month.
The most challenging month is June, which is hot, with average highs of 30 °C86 °F, very wet (215 mm8.5 in) and humid (83% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Heshan
- Winter (December–February) — highs 949 to 13 °C55 °F, lows 032 to 3 °C37 °F, about 66 mm2.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 1864 to 27 °C81 °F, lows 745 to 18 °C64 °F, about 167 mm6.6 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket, an extra layer for the cooler mornings and evenings and an umbrella or light rain jacket.
- Summer (June–August) — highs 3086 to 32 °C90 °F, lows 2272 to 25 °C76 °F, about 163 mm6.4 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
- Autumn (September–November) — highs 1864 to 29 °C85 °F, lows 745 to 20 °C67 °F, about 85 mm3.3 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket and an extra layer for the cooler mornings and evenings.
How Heshan compares
Compared with Changsha, about 74 km to the southeast, Heshan is on average 0.5 °C0.9 °F cooler and receives 8% less precipitation (1,442 mm57 in vs 1,560 mm61 in). The difference is largest in January (0.9 °C1.7 °F cooler).
Of the 547 places in China covered by World Climates, Heshan is the 168th warmest by annual mean temperature and the 123rd wettest by annual precipitation. See all of them on the China climate page.
Places in other countries with the most similar temperature and rainfall pattern: Columbia (United States, Cfa), Little Rock (United States, Cfa) and Fayetteville (United States, Cfa).
Nearby places
- Changsha 74 km · 18 °C64 °F · 1,560 mm61 in
- Shaoshan 74 km · 17 °C63 °F · 1,493 mm59 in
- Changde 82 km · 17 °C63 °F · 1,387 mm55 in
- Xiangxiang 95 km · 18 °C65 °F · 1,555 mm61 in
- Xiangtan 97 km · 18 °C65 °F · 1,560 mm61 in
- Loudi 99 km · 18 °C64 °F · 1,429 mm56 in
- Zhuzhou 114 km · 18 °C65 °F · 1,560 mm61 in
- Yueyang 115 km · 17 °C63 °F · 1,380 mm54 in
Frequently asked questions
What is the warmest month in Heshan?
July is the warmest month in Heshan, with an average high of 32 °C (90 °F) and an average low of 25 °C (76 °F).
What is the coldest month in Heshan?
January is the coldest month, with an average high of 9 °C (49 °F) and an average low of 0 °C (32 °F).
When does it rain the most in Heshan?
June is the wettest month with about 215 mm (8.5 in) of precipitation; December is the driest with about 51 mm (2.0 in).
What is the best time to visit Heshan?
Judging by long-term averages, the most comfortable months are October.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.