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Weather & Climate in Somero, Finland
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Somero has a cool climate with an average annual temperature of 40°F (4°C). Winters average 22°F in January while summers reach 61°F in July. The area gets 289 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 25.8 inches (drier than the 38-inch national average). The area receives 9.6 inches of snow annually. The city sits at an elevation of 305 feet.
Temperature
22°F Jan (-6°C)
61°F Jul (16°C)
| Annual Average | 39.9°F |
| 26% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 289 days/yr |
Geography
| Elevation | 305 ft (93 m) |
| Area | 358.6 sq mi (928.9 km²) |
| Population Density | 23/sq mi |
| Coordinates | 60.6167°N, 23.5333°W |
| Timezone | Europe/Helsinki |
Precipitation & Snow
Air Quality
Earthquake History
9 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 | 141 km | 0 km |
| May 12, 2005 | 29 km SSE of Hanko, Finland | M2.7 | 116 km | 0 km |
| May 12, 2005 | 28 km SSE of Hanko, Finland | M2.7 | 113 km | 0 km |
| May 12, 2005 | 28 km SE of Hanko, Finland | M2.7 | 106 km | 0 km |
| May 24, 1995 | 8 km ENE of Nagu, Finland | M2.7 | 92 km | 10 km |
| Mar 9, 2005 | Baltic Sea | M2.6 | 126 km | 0 km |
| Mar 9, 2005 | 30 km SSW of Dragsfjärd, Finland | M2.6 | 113 km | 0 km |
| Mar 19, 2011 | Finland | M2.6 | 96 km | 3 km |
| Mar 9, 2005 | 49 km SSW of Dragsfjärd, Finland | M2.5 | 131 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.9 in | |
| February | 20°F (-7°C) | 1.4 in | Coldest, Driest |
| March | 27°F (-3°C) | 1.5 in | |
| April | 37°F (3°C) | 1.4 in | |
| May | 50°F (10°C) | 1.4 in | |
| June | 58°F (14°C) | 2.1 in | |
| July | 61°F (16°C) | 3.2 in | Warmest, Wettest |
| August | 58°F (15°C) | 3.1 in | |
| September | 49°F (9°C) | 2.5 in | |
| October | 40°F (5°C) | 2.6 in | |
| November | 32°F (-0°C) | 2.6 in | |
| December | 25°F (-4°C) | 2.2 in |
Somero has a seasonal temperature swing of 41°F / from 20°F in February to 61°F in July. Total annual precipitation is 25.8 inches, with July being the wettest month (3.2") and February the driest (1.4").