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Weather & Climate in Onsala, Sweden
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Onsala has a cool climate with an average annual temperature of 45°F (7°C). Winters average 31°F in January while summers reach 61°F in July. The area gets 280 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 30.7 inches. The area receives 9.7 inches of snow annually. The city sits at an elevation of 112 feet.
Temperature
31°F Jan (-1°C)
61°F Jul (16°C)
| Annual Average | 45.2°F |
| 16% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 61°F (16°C) |
| Sunny Days | 280 days/yr |
Geography
| Elevation | 112 ft (34 m) |
| Area | 5.6 sq mi (14.4 km²) |
| Population Density | 2,204/sq mi |
| Coordinates | 57.4253°N, 12.0290°W |
| Timezone | Europe/Stockholm |
Precipitation & Snow
Air Quality
Earthquake History
17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Aug 6, 2012 | 39 km WSW of Steninge, Sweden | M4.2 | 91 km | 10 km |
| Oct 4, 1995 | 20 km WSW of Steninge, Sweden | M3.9 | 83 km | 10 km |
| May 24, 1990 | 10 km W of Västra Hagen, Sweden | M3.6 | 16 km | 5 km |
| Jul 29, 2015 | 4 km NE of Nolvik, Sweden | M3.4 | 42 km | 13 km |
| May 30, 1995 | 5 km E of Ryomgård, Denmark | M3.2 | 146 km | 10 km |
| May 10, 1994 | 24 km SW of Ellös, Sweden | M3.2 | 87 km | 35 km |
| Feb 3, 2005 | 29 km NNW of Nykøbing Sjælland, Denmark | M3.0 | 144 km | 0 km |
| Mar 10, 2004 | Denmark | M2.8 | 113 km | 10 km |
| Jun 23, 2018 | 2 km SW of Götene, Sweden | M2.8 | 148 km | 10 km |
| Apr 22, 1993 | 13 km W of Skärhamn, Sweden | M2.8 | 74 km | 10 km |
| Apr 26, 2005 | 24 km N of Hirtshals, Denmark | M2.7 | 132 km | 10 km |
| Feb 1, 2005 | 32 km SE of Grenaa, Denmark | M2.7 | 142 km | 0 km |
| Aug 29, 1993 | 26 km SW of Glommen, Sweden | M2.7 | 73 km | 10 km |
| Dec 7, 1993 | 11 km N of Gilleleje, Denmark | M2.7 | 134 km | 10 km |
| Jun 8, 2005 | 3 km WNW of Skagen, Denmark | M2.6 | 96 km | 10 km |
| Aug 29, 1991 | 43 km W of Smögen, Sweden | M2.6 | 142 km | 10 km |
| Apr 25, 2008 | 9 km NNW of Strandby, Denmark | M2.5 | 97 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.7 in | |
| February | 30°F (-1°C) | 1.9 in | Coldest |
| March | 35°F (2°C) | 2.0 in | |
| April | 42°F (5°C) | 1.7 in | Driest |
| May | 51°F (11°C) | 1.9 in | |
| June | 58°F (14°C) | 2.4 in | |
| July | 61°F (16°C) | 2.6 in | Warmest |
| August | 61°F (16°C) | 2.9 in | |
| September | 54°F (12°C) | 3.2 in | Wettest |
| October | 47°F (8°C) | 3.1 in | |
| November | 39°F (4°C) | 3.1 in | |
| December | 34°F (1°C) | 3.1 in |
Onsala has a seasonal temperature swing of 31°F / from 30°F in February to 61°F in July. Total annual precipitation is 30.7 inches, with September being the wettest month (3.2") and April the driest (1.7").