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Weather & Climate in Hanko, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Hanko has a cool climate with an average annual temperature of 42°F (6°C). Winters average 27°F in January while summers reach 62°F in July. The area gets 293 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 23.7 inches (drier than the 38-inch national average). The area receives 6.9 inches of snow annually. The city sits at an elevation of 46 feet.
Temperature
27°F Jan (-3°C)
62°F Jul (17°C)
| Annual Average | 42.4°F |
| 21% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 46 ft (14 m) |
| Area | 324.9 sq mi (841.5 km²) |
| Population Density | 31/sq mi |
| Coordinates | 59.8333°N, 22.9500°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
8 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.8.
| Mar 9, 2005 | 56 km ESE of Kökar, Aland Islands | M2.8 | 66 km | 0 km |
| May 12, 2005 | 29 km SSE of Hanko, Finland | M2.7 | 29 km | 0 km |
| May 12, 2005 | 28 km SSE of Hanko, Finland | M2.7 | 29 km | 0 km |
| May 12, 2005 | 28 km SE of Hanko, Finland | M2.7 | 29 km | 0 km |
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 66 km | 10 km |
| Mar 9, 2005 | Baltic Sea | M2.6 | 43 km | 0 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 36 km | 0 km |
| Mar 9, 2005 | 49 km SSW of Dragsfjärd, Finland | M2.5 | 50 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 1.8 in | |
| February | 25°F (-4°C) | 1.3 in | Coldest |
| March | 29°F (-2°C) | 1.5 in | |
| April | 36°F (2°C) | 1.4 in | |
| May | 47°F (8°C) | 1.2 in | Driest |
| June | 56°F (14°C) | 1.5 in | |
| July | 62°F (17°C) | 2.3 in | Warmest |
| August | 61°F (16°C) | 2.6 in | |
| September | 53°F (12°C) | 2.4 in | |
| October | 45°F (7°C) | 2.7 in | Wettest |
| November | 37°F (3°C) | 2.7 in | |
| December | 31°F (-0°C) | 2.4 in |
Hanko has a seasonal temperature swing of 37°F / from 25°F in February to 62°F in July. Total annual precipitation is 23.8 inches, with October being the wettest month (2.7") and May the driest (1.2").