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Weather & Climate in Porsgrunn, Norway
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Porsgrunn has a cool climate with an average annual temperature of 45°F (7°C). Winters average 29°F in January while summers reach 64°F in July. The area gets 267 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 38.1 inches. The area receives 7.9 inches of snow annually. The city sits at an elevation of 30 feet.
Temperature
29°F Jan (-2°C)
64°F Jul (18°C)
| Annual Average | 45.4°F |
| 16% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 267 days/yr |
Geography
| Elevation | 30 ft (9 m) |
| Area | 163.4 sq mi (423.1 km²) |
| Population Density | 210/sq mi |
| Coordinates | 59.1405°N, 9.6561°W |
| Timezone | Europe/Oslo |
Precipitation & Snow
Air Quality
Earthquake History
17 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Feb 19, 1992 | 5 km SE of Fredrikstad, Norway | M3.8 | 77 km | 10 km |
| Nov 19, 1994 | 0 km WNW of Jessheim, Norway | M3.5 | 140 km | 10 km |
| Nov 29, 2000 | 9 km E of Strömstad, Sweden | M3.4 | 99 km | 10 km |
| May 10, 1994 | 24 km SW of Ellös, Sweden | M3.2 | 149 km | 35 km |
| Jun 29, 2004 | 17 km E of Hovden, Norway | M3.1 | 122 km | 8 km |
| Sep 28, 1993 | 44 km WSW of Grebbestad, Sweden | M2.9 | 80 km | 10 km |
| May 25, 2008 | 4 km WSW of Åneby, Norway | M2.9 | 123 km | 15 km |
| Aug 15, 1991 | 7 km ESE of Stavern, Norway | M2.7 | 33 km | 10 km |
| Nov 19, 1994 | 7 km NW of Jessheim, Norway | M2.7 | 141 km | 10 km |
| Nov 21, 1994 | 6 km NNW of Jessheim, Norway | M2.7 | 143 km | 10 km |
| Apr 26, 2005 | 24 km N of Hirtshals, Denmark | M2.7 | 149 km | 10 km |
| Aug 1, 1994 | 30 km N of Noresund, Norway | M2.7 | 146 km | 5 km |
| Aug 29, 1991 | 43 km W of Smögen, Sweden | M2.6 | 95 km | 10 km |
| Feb 1, 1991 | 5 km SSE of Melsomvik, Norway | M2.6 | 40 km | 10 km |
| Dec 12, 1994 | 8 km S of Rotnes, Norway | M2.6 | 115 km | 5 km |
| Jan 29, 2005 | 7 km NNE of Hvittingfoss, Norway | M2.6 | 50 km | 15 km |
| May 23, 1990 | 50 km WNW of Smögen, Sweden | M2.5 | 80 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 6.0 m (20 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1966 | EASTERN NORWAY | Meteorological | 6.0 m | - | 75 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 3.0 in | Coldest |
| February | 31°F (-1°C) | 2.0 in | Driest |
| March | 36°F (2°C) | 2.6 in | |
| April | 43°F (6°C) | 2.0 in | |
| May | 54°F (12°C) | 2.4 in | |
| June | 60°F (16°C) | 2.8 in | |
| July | 64°F (18°C) | 3.1 in | Warmest |
| August | 62°F (17°C) | 3.7 in | |
| September | 54°F (12°C) | 4.4 in | |
| October | 45°F (7°C) | 4.8 in | Wettest |
| November | 36°F (2°C) | 4.5 in | |
| December | 30°F (-1°C) | 2.9 in |
Porsgrunn has a seasonal temperature swing of 35°F / from 29°F in January to 64°F in July. Total annual precipitation is 38.1 inches, with October being the wettest month (4.8") and February the driest (2.0").