Lake · Denmark
Arresø
Lake in Halsnæs Municipality, Capital Region of Denmark, Denmark
- Area
- 37.7km²
- Max depth
- 6m
- Average depth
- 4.7m
- Elevation
- 2m a.s.l.
- Shoreline
- 40km
- Volume
- 0.177km³
Arresø is a lake in Denmark. It covers 37.7 km². On average it is 4.7 m deep, and 6 m at its deepest point. Its surface lies 2 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Arresø?
The water is warmest in July, around 21 °C at the surface, and coldest in January, around 0 °C. The surface averages 20 °C or more in July: comfortable for most swimmers.
The lake usually freezes over for about 33 days a year, from around 4 January to 5 February.
On the shore, afternoons reach 20 °C on average in July and 2 °C in February. The driest month is April (38 mm of rain), the wettest August (89 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (88 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 | — | 3 | 0 | 68 | 13 | 0.4 | 27 |
| February | 0 | 1 | 2 | 0 | 54 | 11 | 1.7 | 25 |
| March | 3 | 5 | 5 | 1 | 45 | 11 | 4.7 | 23 |
| April | 8 | 11 | 9 | 4 | 38 | 9 | 7.1 | 20 |
| May | 15 | 18 | 14 | 9 | 52 | 11 | 8.5 | 19 |
| June | 20 | 21 | 18 | 13 | 74 | 12 | 8.8 | 20 |
| July | 21 | 22 | 20 | 16 | 79 | 13 | 8.0 | 18 |
| August | 20 | 21 | 20 | 16 | 89 | 16 | 6.7 | 20 |
| September | 15 | 18 | 17 | 13 | 64 | 13 | 5.4 | 22 |
| October | 10 | 13 | 12 | 9 | 81 | 15 | 2.8 | 24 |
| November | 5 | 7 | 8 | 5 | 71 | 15 | 0.7 | 25 |
| December | 1 | 3 | 4 | 2 | 72 | 15 | 0.2 | 26 |
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 23 months before flowing out.
- Its catchment drains 247 km² of land.
- About 2.9 m³ of water flow out every second, on average.
Around the shore
What's around Arresø
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- —beaches and swimming spots
- 4campsites
Tisvilde Hegn, Plads nær Asserbo slotsruin - fri teltning, Arresøcentret, St Lyngby Skov
- 1boat hire and water-sport clubs
Ågabet Outdoor Center
- 3marinas and slipways
Auderød Havn, Ramløse Havn
- —ferry piers
- 8viewpoints
Maglehøj and 7 more
- 2hotels, B&Bs and chalets
Hotel Frederiksværk, Garbolund
- —fishing spots
- 10restaurants and cafés
Towns on the shore
- Frederiksværk12,718 people
- Ølsted1,946 people
- Ramløse1,551 people
Nearest airport with scheduled flights: Copenhagen Roskilde Airport (RKE), 43 km in a straight line.
Car hire at CPH airport (Copenhagen)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Photos
Seen by visitors
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 | 2.7 | 2.4 | 4.6 | 9.3 | 14.1 | 17.6 | 20.1 | 19.9 | 16.7 | 11.9 | 7.7 | 4.4 |
| 2020 | +3.5 | +3.6 | +1.7 | +0.6 | −1.5 | +1.5 | −2.1 | +1.6 | +0.8 | +0.8 | +1.8 | +0.9 |
| 2021 | −0.4 | −1.3 | +0.8 | −1.2 | −1.6 | +1.6 | +1.5 | −0.9 | +0.9 | +0.9 | +0.9 | −0.9 |
| 2022 | +2.0 | +2.9 | +1.2 | −0.3 | −0.1 | +0.6 | −0.4 | +1.7 | −0.2 | +2.0 | +1.4 | −1.2 |
| 2023 | +2.2 | +2.3 | +0.8 | −0.1 | ±0.0 | +2.1 | −1.0 | −0.9 | +2.5 | +0.7 | −1.0 | −0.3 |
| 2024 | −0.5 | +2.5 | +1.5 | −0.1 | +2.5 | ±0.0 | −0.8 | +0.4 | +1.3 | +1.1 | +0.6 | +1.5 |
| 2025 | +1.5 | +0.3 | +2.4 | +2.1 | −0.2 | +0.3 | +0.6 | −0.1 | +1.4 | +0.9 | ±0.0 | +1.7 |
+1 warmer than usual −1 cooler than usual
SwedenAbout 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 (Q699572) · 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.
