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Weather & Climate in Haimen, China
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Haimen enjoys a temperate climate with an average annual temperature of 60°F (15°C). Winters average 40°F in January while summers reach 81°F in July. The area gets 256 sunny days per year, above the national average. Annual precipitation totals 52.8 inches (wetter than the 38-inch national average). The area receives 1.5 inches of snow annually. The city sits at an elevation of 33 feet.
Temperature
40°F Jan (4°C)
81°F Jul (27°C)
| Annual Average | 59.7°F |
| 11% above US avg | |
| January Average | 40°F (4°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 256 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 33.1 sq mi (85.7 km²) |
| Population Density | 0/sq mi |
| Coordinates | 31.8962°N, 121.1727°W |
| Timezone | Asia/Shanghai |
Precipitation & Snow
Air Quality
Earthquake History
4 earthquakes (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 | 28 km | 10 km |
| Jul 19, 2010 | 50 km ENE of Juegang, China | M4.5 | 85 km | 25 km |
| May 20, 1995 | 51 km NE of Juegang, China | M4.1 | 89 km | 33 km |
| Aug 30, 1998 | 58 km NE of Juegang, China | M3.9 | 99 km | 33 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
16 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 2.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Bebinca | Category 1 | 81 mph | 78 km |
| 2022 | Muifa | Category 1 | 86 mph | 92 km |
| 2021 | Chanthu | Category 1 | 92 mph | 225 km |
| 2019 | Lekima | Category 1 | — | 272 km |
| 2015 | Chan-hom | Category 1 | 86 mph | 227 km |
| 2012 | Damrey | Category 1 | 81 mph | 232 km |
| 2005 | Khanun | Category 1 | 75 mph | 176 km |
| 2002 | Rammasun | Category 2 | 86 mph | 249 km |
| 2000 | Jelawat | Category 1 | 58 mph | 295 km |
| 2000 | Prapiroon | Category 1 | 81 mph | 206 km |
| 1994 | Doug | Category 1 | 69 mph | 236 km |
| 1994 | Ellie | Category 1 | 69 mph | 154 km |
| 1990 | Abe | Category 1 | 63 mph | 162 km |
| 1985 | Mamie | Category 1 | 75 mph | 40 km |
| 1984 | Ed | Category 1 | 63 mph | 97 km |
| 1981 | Agnes | Category 2 | 92 mph | 206 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 40°F (4°C) | 1.4 in | Coldest |
| February | 40°F (4°C) | 1.9 in | |
| March | 47°F (8°C) | 2.6 in | |
| April | 57°F (14°C) | 3.3 in | |
| May | 66°F (19°C) | 3.9 in | |
| June | 74°F (23°C) | 6.3 in | |
| July | 81°F (27°C) | 6.5 in | Warmest, Wettest |
| August | 81°F (27°C) | 4.9 in | |
| September | 73°F (23°C) | 4.8 in | |
| October | 64°F (18°C) | 2.1 in | |
| November | 53°F (12°C) | 2.0 in | |
| December | 42°F (6°C) | 1.3 in | Driest |
Haimen has a seasonal temperature swing of 41°F / from 40°F in January to 81°F in July. Total annual precipitation is 41.0 inches, with July being the wettest month (6.5") and December the driest (1.3").