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Weather & Climate in Jiashan, China
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Jiashan enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 42°F in January while summers reach 84°F in July. The area gets 247 sunny days per year, above the national average. Annual precipitation totals 55.6 inches (wetter than the 38-inch national average). The area receives 1.4 inches of snow annually. The city sits at an elevation of 23 feet.
Temperature
42°F Jan (5°C)
84°F Jul (29°C)
| Annual Average | 63.4°F |
| 17% above US avg | |
| January Average | 42°F (5°C) |
| July Average | 84°F (29°C) |
| Sunny Days | 247 days/yr |
Geography
| Elevation | 23 ft (7 m) |
| Area | 31.7 sq mi (82.2 km²) |
| Population Density | 4,320/sq mi |
| Coordinates | 30.8492°N, 120.9258°W |
| Timezone | Asia/Shanghai |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.0.
| Feb 9, 1990 | 27 km E of Changshu City, China | M5.0 | 93 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
20 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 3.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Bebinca | Category 1 | 81 mph | 42 km |
| 2022 | Muifa | Category 2 | 92 mph | 83 km |
| 2021 | Chanthu | Category 2 | 98 mph | 227 km |
| 2019 | Lekima | Category 2 | 98 mph | 153 km |
| 2019 | Mitag | Category 1 | 69 mph | 279 km |
| 2015 | Chan-hom | Category 2 | 92 mph | 186 km |
| 2012 | Haikui | Category 1 | 75 mph | 254 km |
| 2005 | Khanun | Category 3 | 86 mph | 71 km |
| 2004 | Rananim | Category 2 | 69 mph | 284 km |
| 2002 | Rammasun | Category 1 | 81 mph | 290 km |
| 2000 | Prapiroon | Category 1 | 81 mph | 208 km |
| 2000 | Jelawat | Category 1 | 75 mph | 192 km |
| 1997 | Winnie | Category 1 | 81 mph | 204 km |
| 1994 | Ellie | Category 1 | 69 mph | 260 km |
| 1994 | Doug | Category 1 | 81 mph | 238 km |
| 1990 | Abe | Category 2 | 75 mph | 57 km |
| 1985 | Mamie | Category 1 | 75 mph | 119 km |
| 1985 | Jeff | Category 1 | - | 296 km |
| 1984 | Ed | Category 1 | 63 mph | 168 km |
| 1981 | Agnes | Category 2 | 92 mph | 217 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (5°C) | 1.8 in | |
| February | 41°F (5°C) | 2.2 in | Coldest |
| March | 48°F (9°C) | 2.6 in | |
| April | 59°F (15°C) | 3.2 in | |
| May | 68°F (20°C) | 4.3 in | |
| June | 75°F (24°C) | 6.8 in | Wettest |
| July | 84°F (29°C) | 5.7 in | Warmest |
| August | 82°F (28°C) | 4.7 in | |
| September | 74°F (23°C) | 5.2 in | |
| October | 65°F (18°C) | 1.3 in | Driest |
| November | 54°F (12°C) | 1.8 in | |
| December | 44°F (6°C) | 1.8 in |
Jiashan has a seasonal temperature swing of 42°F / from 41°F in February to 84°F in July. Total annual precipitation is 41.3 inches, with June being the wettest month (6.8") and October the driest (1.3").