Weather statistics for Svelvik observation site, Svelvik (Vestfold)

  1. Warning sign

    Ongoing: Landslide risk. Caution level: yellow (Østlandet, Telemark og deler av Trøndelag)

    Relatively high temperatures and windy conditions, causes significant snowmelting. Risk of slush flows is especially high in areas with more than 40-50 cm snow. The snow may in some places be fully water-saturated. Areas with fresh snow are particularly exposed, since new snow may be saturated with water quickly. Slush flows are triggered even in gentle slopes, where water accumulates. Slush flows follow terrain depressions and may develop into debris flows. Read the full forecast on


    1. Monday January 1, 0001 12:00
      Increasing danger
    2. Tuesday April 24, 2018 12:00
      Danger is over

    Some landslides are expected. A few large events may occur. Exposed railways and roads may be closed. Debris avalanches/shallow slides: Soil slides and rapid movement of saturated soil in steep terrain. Debris floods: A "flood" of water, soil and rocks in steep creeks. Surface runoff in steep terrain can cause streams to change regular flow patterns. Slush slides: A flow of waterlogged snow. These landslides can start in relatively flat terrain and seek towards streams and steep slopes.Keep away from steep slopes, as well as streams and rivers with high discharge. Cleaning of drainage paths and culverts are recommended. Keep water paths and culverts free from snow, ice, sediments, waste, twigs and leaves.

Svelvik observation station (26950)

The station is located in Svelvik municipality, 4 m.a.s.l. It is the closest official weather station, 0.0 km away from Svelvik observation site. The station was established in January 2005. The station measures precipitation and temperature. There may be missing data.

Last 30 days: Average temperature was 3.1 °C, 0.3 °C above the normal. Highest temperature was 17.3 °C (15 April), and the lowest was -8.8 °C (28 March).

Last 13 full months: Highest temperature was 26.6 °C (23. Jul. 2017) and the lowest -17.1 °C (26. Feb. 2018). Highest daily precipitation was 35.2 mm (10. Jun. 2017).

Graph explanation. Hide explanation

The black line shows mean value (both precipitation and temperature). Some stations does not have mean values, and hence no black line.

The red/blue line shows average temperature during the day (24h) (equalized for 30 days). The line is red by pluss degrees, and blue by minus degrees.

The red/blue areas shows the temperature variations throughout the day (24h) with max- and min. temperature as endpoints. The area is red by pluss degrees, and blue by minus degrees.

The lightblue bars shows total precipitation this month. The black lines crossing is the normal (mean) value for precipitation.

The dark grey bars behind the precipitation bars shows snowdepth measured day by day.

Some stations only measures precipitation, while others only measures temperature. If an area or bar is missing the station does not measure this data.

NB! Precipitation is measured at 07 hours Norwegian time. The value (in mm) shows last 24 hours until 07 hours (08 hours summertime). Download other weather statistics from

Tabular view for temperature and precipitation per month
Months Temperature Precipitation
Average Normal Warmest Coldest Total Normal Highest
daily value
Mar 2018 -2.9°C -1.0°C 10.0°C Mar 25 -17.1°C Mar 18 57.0 mm
Feb 2018 -4.0°C -5.0°C 2.6°C Feb 14 -17.1°C Feb 26 48.0 mm
Jan 2018 -2.2°C -4.8°C 6.5°C Jan 24 -14.4°C Jan 7 65.0 mm
Dec 2017 -1.7°C -2.9°C 8.7°C Dec 7 -12.1°C Dec 17 66.0 mm
Nov 2017 1.8°C 1.2°C 11.7°C Nov 2 -6.8°C Nov 22 91.0 mm 19.0 mm Nov 5
Oct 2017 7.6°C 7.0°C 17.6°C Oct 6 -2.4°C Oct 30 149.6 mm 110.0 mm 31.2 mm Oct 2
Sep 2017 12.6°C 11.7°C 20.1°C Sep 2 6.5°C Sep 1 122.6 mm 100.0 mm 31.4 mm Sep 12
Aug 2017 15.4°C 15.6°C 23.0°C Aug 10 6.1°C Aug 14 136.4 mm 88.0 mm 28.0 mm Aug 16
Jul 2017 16.9°C 16.9°C 26.6°C Jul 23 6.3°C Jul 13 48.4 mm 76.0 mm 14.6 mm Jul 31
Jun 2017 15.4°C 15.5°C 26.3°C Jun 18 5.0°C Jun 1 95.0 mm 61.0 mm 35.2 mm Jun 10
May 2017 11.4°C 10.7°C 23.0°C May 29 -0.1°C May 1 92.6 mm 63.0 mm 24.0 mm May 17
Apr 2017 6.2°C 4.3°C 18.1°C Apr 7 -2.7°C Apr 18 65.8 mm 45.0 mm 13.6 mm Apr 29
Mar 2017 3.3°C -1.0°C 14.3°C Mar 26 -6.4°C Mar 8 58.1 mm 57.0 mm 17.8 mm Mar 1