Crater lake · Sweden
Dellen
2 lakes in Sweden formed by an impact crater
- Area
- 79.9km²
- Average depth
- 15m
- Elevation
- 32m a.s.l.
- Shoreline
- 75km
- Volume
- 1.2km³
Dellen is a crater lake in Sweden. It covers 79.9 km². On average it is 15 m deep. Its surface lies 32 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Dellen?
The water is warmest in July, around 18 °C at the surface, and coldest in January, around 0 °C. It rarely averages 20 °C, but it stays above 17 °C from July to August: brisk, refreshing swimming.
The lake usually freezes over for about 119 days a year, from around 15 December to 12 April.
On the shore, afternoons reach 20 °C on average in July and -4 °C in January. The driest month is February (44 mm of rain), the wettest August (104 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (95 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | Ice | — | -4 | -9 | 58 | 12 | 0.6 | 10 |
| February | Ice | — | -3 | -9 | 44 | 10 | 2.7 | 9 |
| March | Ice | — | 1 | -6 | 47 | 11 | 5.5 | 9 |
| April | 1 | 4 | 7 | -1 | 46 | 10 | 6.9 | 9 |
| May | 7 | 11 | 13 | 4 | 70 | 12 | 7.9 | 8 |
| June | 14 | 17 | 17 | 9 | 80 | 14 | 9.2 | 8 |
| July | 18 | 19 | 20 | 12 | 92 | 15 | 8.2 | 8 |
| August | 18 | 19 | 18 | 11 | 104 | 15 | 6.7 | 8 |
| September | 14 | 16 | 14 | 7 | 71 | 12 | 4.7 | 9 |
| October | 10 | 12 | 7 | 2 | 82 | 13 | 2.6 | 9 |
| November | 5 | 7 | 1 | -2 | 66 | 14 | 0.9 | 9 |
| December | Ice | — | -2 | -7 | 66 | 14 | 0.5 | 10 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 4.7 years before flowing out.
- Its catchment drains 1,040 km² of land.
- About 8.0 m³ of water flow out every second, on average.
Around the shore
What's around Dellen
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 29beaches and swimming spots
Bjams, Blodmyra, Målars, Hallboviken, Fönebo and 24 more
- 7campsites
Norra Dellen Familjecamping, Ställplats Dellenbaden, Naturcamping, Norra Dellen Camping, Fönebo Camping and 2 more
- 1boat hire and water-sport clubs
- 3marinas and slipways
Sjösättningsplats
- —ferry piers
- 1viewpoints
Avholmsberget
- 3hotels, B&Bs and chalets
- —fishing spots
- 4restaurants and cafés
Nearest airport with scheduled flights: Sundsvall-Härnösand Airport (SDL), 81 km in a straight line.
OpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | -3.7 | -3.0 | 0.7 | 6.9 | 12.6 | 17.1 | 20.0 | 18.5 | 13.6 | 6.6 | 1.2 | -2.1 |
| 2020 | +5.1 | +3.9 | +1.7 | +0.1 | −2.0 | +4.3 | −2.7 | +1.3 | +0.2 | +0.7 | +3.1 | +2.8 |
| 2021 | −2.9 | −1.6 | +1.7 | −0.4 | −1.5 | +2.9 | +2.5 | −1.1 | −1.1 | +2.0 | −0.4 | −2.1 |
| 2022 | +0.9 | +1.0 | +3.3 | −0.2 | +0.4 | +2.7 | −0.8 | +1.3 | −0.8 | +2.4 | +1.6 | −3.1 |
| 2023 | +1.6 | +1.2 | −1.0 | −0.4 | +1.9 | +2.9 | −0.7 | +0.2 | +2.2 | −1.7 | −4.3 | −3.5 |
| 2024 | −1.1 | −0.6 | −0.5 | −2.3 | +5.0 | +1.6 | −0.4 | +0.7 | +1.3 | +1.9 | +1.1 | +1.0 |
| 2025 | +1.3 | +1.5 | +3.7 | +2.4 | −0.8 | −0.1 | +2.5 | −0.7 | +1.9 | +1.3 | +0.9 | +3.2 |
+1 warmer than usual −1 cooler than usual
About these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q1184425) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
