Yaan climate
Yaan (Sichuan, China) has a monsoon-influenced humid subtropical climate (Köppen Cwa). The average temperature over the year is 17 °C63 °F, and about 1,325 mm52 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Yaan climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 1049 | 236 | 643 | 130.5 |
| Feb | 1355 | 440 | 948 | 190.7 |
| Mar | 1865 | 948 | 1456 | 461.8 |
| Apr | 2374 | 1457 | 1965 | 863.4 |
| May | 2780 | 1864 | 2272 | 1285.0 |
| Jun | 2985 | 2170 | 2577 | 1706.7 |
| Jul | 3087 | 2374 | 2780 | 27711 |
| Aug | 2985 | 2373 | 2679 | 30712 |
| Sep | 2679 | 1966 | 2272 | 1566.1 |
| Oct | 2170 | 1458 | 1864 | 783.1 |
| Nov | 1661 | 948 | 1355 | 301.2 |
| Dec | 1151 | 438 | 745 | 140.6 |
| Year | 3087 | 236 | 1763 | 1,32552 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 80% | 71% | 2.5 | 10:25 |
| Feb | 78% | 73% | 3.0 | 11:05 |
| Mar | 74% | 80% | 3.3 | 11:55 |
| Apr | 72% | 83% | 3.9 | 12:52 |
| May | 72% | 88% | 3.8 | 13:39 |
| Jun | 75% | 93% | 3.6 | 14:04 |
| Jul | 80% | 91% | 3.9 | 13:54 |
| Aug | 82% | 88% | 3.8 | 13:13 |
| Sep | 84% | 93% | 2.9 | 12:18 |
| Oct | 84% | 90% | 2.4 | 11:23 |
| Nov | 83% | 78% | 2.4 | 10:36 |
| Dec | 80% | 71% | 2.2 | 10:13 |
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 Yaan is like
The warmest month is July, with an average high of 30 °C87 °F and a low of 23 °C74 °F. The coldest is January, when highs average 10 °C49 °F and lows 2 °C36 °F. Seasons are strongly marked: the warmest month is on average 21 °C37.7 °F warmer than the coldest.
It is wet, with about 1,325 mm52 in of precipitation per year. The wettest three-month stretch is June–August, which brings 57% of the annual total. Months with less than 20 mm0.8 in on average: December–February. The wettest month is August (307 mm12 in), the driest is January (13 mm0.5 in).
Relative humidity ranges from 72% in May to 84% in October. The clearest skies (lowest average cloud amount, 71%) are typical of December. Average wind speed near the ground ranges from 4 km/h (3 mph) in October to 6 km/h (3 mph) in March. Daylight lasts from about 10.2 hours in December to 14.1 hours in June.
Best time to visit Yaan
Based on these averages, the most comfortable months for sightseeing and outdoor activities are March and April and October: average highs of 18 °C65 °F to 23 °C74 °F with 46 mm1.8 in to 86 mm3.4 in of precipitation per month.
The most challenging month is August, which is very wet (307 mm12 in) and humid (82% 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 Yaan
- Winter (December–February) — highs 1049 to 13 °C55 °F, lows 236 to 4 °C40 °F, about 15 mm0.6 in of precipitation a month. Pack long sleeves, a sweater and a medium jacket.
- Spring (March–May) — highs 1865 to 27 °C80 °F, lows 948 to 18 °C64 °F, about 87 mm3.4 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
- Summer (June–August) — highs 2985 to 30 °C87 °F, lows 2170 to 23 °C74 °F, about 252 mm9.9 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Autumn (September–November) — highs 1661 to 26 °C79 °F, lows 948 to 19 °C66 °F, about 88 mm3.5 in of precipitation a month. Pack light layers — T-shirts plus a light sweater or jacket.
How Yaan compares
Compared with Meishan, about 81 km to the east, Yaan is on average 0.6 °C1.1 °F cooler and receives 10% more precipitation (1,325 mm52 in vs 1,207 mm48 in). The difference is largest in May (0.9 °C1.7 °F cooler).
Of the 547 places in China covered by World Climates, Yaan is the 187th warmest by annual mean temperature and the 154th 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 (seasons shifted for the other hemisphere where needed): Rosario (Argentina, Cfa), San Luis (Argentina, Cwa) and Río Cuarto (Argentina, Cwa).
Nearby places
- Meishan 81 km · 18 °C64 °F · 1,207 mm48 in
- Leshan 88 km · 18 °C65 °F · 1,232 mm49 in
- Kangding 100 km · 10 °C50 °F · 1,016 mm40 in
- Chengdu 127 km · 17 °C63 °F · 990 mm39 in
- Ziyang 159 km · 18 °C64 °F · 1,067 mm42 in
- Deyang 184 km · 18 °C64 °F · 920 mm36 in
- Zigong 186 km · 18 °C65 °F · 1,054 mm41 in
- Shuifu 203 km · 20 °C67 °F · 1,044 mm41 in
Frequently asked questions
What is the warmest month in Yaan?
July is the warmest month in Yaan, with an average high of 30 °C (87 °F) and an average low of 23 °C (74 °F).
What is the coldest month in Yaan?
January is the coldest month, with an average high of 10 °C (49 °F) and an average low of 2 °C (36 °F).
When does it rain the most in Yaan?
August is the wettest month with about 307 mm (12.1 in) of precipitation; January is the driest with about 13 mm (0.5 in).
What is the best time to visit Yaan?
Judging by long-term averages, the most comfortable months are March and April and 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.
The grid cell’s average elevation is 1,050 m, while Yaan lies at about 591 m. Temperatures on this page were therefore adjusted by +3 °C5.4 °F using the standard lapse rate of 6.5 °C per 1,000 m.