Lake · Finland
Ruotsalainen
Lake in Heinola, Finland
- Area
- 127km²
- Average depth
- 26m
- Elevation
- 66m a.s.l.
- Shoreline
- 389km
- Volume
- 3.3km³
Ruotsalainen is a lake in Finland. It covers 127 km². On average it is 26 m deep. Its surface lies 66 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Ruotsalainen?
The water is warmest in July, around 20 °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 137 days a year, from around 22 November to 7 April.
On the shore, afternoons reach 22 °C on average in July and -5 °C in January. The driest month is March (41 mm of rain), the wettest June (86 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (122 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 | — | -5 | -11 | 52 | 13 | 0.5 | 9 |
| February | Ice | — | -5 | -11 | 42 | 11 | 2.0 | 9 |
| March | Ice | — | 0 | -7 | 41 | 11 | 5.1 | 9 |
| April | 2 | 5 | 8 | -1 | 44 | 11 | 6.5 | 9 |
| May | 9 | 12 | 15 | 5 | 60 | 11 | 8.1 | 9 |
| June | 16 | 18 | 19 | 10 | 86 | 14 | 8.0 | 8 |
| July | 20 | 20 | 22 | 14 | 85 | 15 | 7.9 | 8 |
| August | 19 | 20 | 20 | 12 | 72 | 14 | 6.5 | 8 |
| September | 15 | 17 | 15 | 7 | 64 | 12 | 3.9 | 9 |
| October | 9 | 12 | 7 | 2 | 72 | 14 | 1.6 | 9 |
| November | 2 | 5 | 1 | -2 | 65 | 14 | 0.1 | 9 |
| December | Ice | — | -3 | -7 | 63 | 15 | 0.1 | 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 6 months before flowing out.
- Its catchment drains 24,002 km² of land.
- About 207 m³ of water flow out every second, on average.
- Its shoreline is 9.7 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Ruotsalainen
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 18beaches and swimming spots
Levijärven uimapaikka, Sinilähteen uimaranta, Kylpylän uimaranta, Kaivannon uimaranta, Jyrängön uimaranta and 13 more
- 1campsites
Heinola Camping Heinäsaari
- —boat hire and water-sport clubs
- 17marinas and slipways
Kirkonpohjan veneluiska, Rullarannan veneluiska, Heinolan satama, Huutotöyryn veneluiska, Jyrängön veneluiska and 12 more
- —ferry piers
- 4viewpoints
- 21hotels, B&Bs and chalets
Kumpeli, Tukkijätkä, Lossirannan Kartano, Koskivaaran koulu, Cronin's and 16 more
- 1fishing spots
- 38restaurants and cafés
Towns on the shore
- Heinola17,746 people
Nearest airport with scheduled flights: Helsinki Vantaa Airport (HEL), 115 km in a straight line.
Car hire at HEL airport (Helsinki)Discover Cars · Affiliate linkOpenStreetMap 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 | -5.4 | -4.8 | -0.2 | 7.7 | 15.1 | 18.9 | 22.1 | 20.3 | 14.7 | 6.8 | 1.1 | -2.7 |
| 2020 | +6.8 | +5.4 | +3.1 | −1.4 | −2.4 | +3.3 | −2.5 | +0.2 | +0.9 | +2.4 | +3.0 | +2.0 |
| 2021 | −1.8 | −3.6 | −0.3 | −0.1 | −1.1 | +4.7 | +2.6 | −1.9 | −2.8 | +1.8 | +0.4 | −4.2 |
| 2022 | +1.6 | +2.4 | +0.4 | −1.2 | −1.6 | +2.0 | −0.3 | +2.3 | −2.2 | +2.3 | +0.2 | −1.4 |
| 2023 | +2.9 | +2.7 | ±0.0 | +1.7 | ±0.0 | +2.2 | −1.5 | +0.9 | +3.3 | −1.6 | −2.8 | −4.0 |
| 2024 | −3.2 | +0.4 | +2.1 | −2.2 | +3.4 | +2.4 | +0.2 | +1.2 | +3.8 | +2.4 | +1.5 | +2.3 |
| 2025 | +3.7 | +2.2 | +4.1 | +0.9 | −1.7 | −0.9 | +2.3 | −1.2 | +2.1 | +1.3 | +2.7 | +3.3 |
+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 (Q533040) · 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.
