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Weather & Climate in Köyliö, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Köyliö has a cool climate with an average annual temperature of 40°F (5°C). Winters average 23°F in January while summers reach 61°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 23.9 inches (drier than the 38-inch national average). The area receives 8.5 inches of snow annually. The city sits at an elevation of 154 feet.
Temperature
23°F Jan (-5°C)
61°F Jul (16°C)
| Annual Average | 40.2°F |
| 26% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 154 ft (47 m) |
| Area | 282.6 sq mi (732.0 km²) |
| Population Density | 10/sq mi |
| Coordinates | 61.1191°N, 22.3098°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.7.
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 101 km | 10 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 146 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.7 in | |
| February | 21°F (-6°C) | 1.3 in | Coldest, Driest |
| March | 28°F (-2°C) | 1.4 in | |
| April | 36°F (2°C) | 1.5 in | |
| May | 49°F (9°C) | 1.3 in | |
| June | 58°F (14°C) | 2.2 in | |
| July | 61°F (16°C) | 2.9 in | Warmest, Wettest |
| August | 58°F (15°C) | 2.9 in | |
| September | 50°F (10°C) | 2.3 in | |
| October | 41°F (5°C) | 2.3 in | |
| November | 33°F (0°C) | 2.2 in | |
| December | 26°F (-3°C) | 1.9 in |
Köyliö has a seasonal temperature swing of 40°F / from 21°F in February to 61°F in July. Total annual precipitation is 23.9 inches, with July being the wettest month (2.9") and February the driest (1.3").