Lake · Canada · United States
Lake Saint Francis
Saint Francis
Lake in Ontario and Quebec, Canada, and New York, United States
- Area
- 238km²
- Average depth
- 3.4m
- Elevation
- 43m a.s.l.
- Shoreline
- 315km
- Volume
- 0.818km³
Lake Saint Francis is a lake in Canada. It covers 238 km². On average it is 3.4 m deep. Its surface lies 43 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake Saint Francis?
The water is warmest in July, around 22 °C at the surface, and coldest in January, around 0 °C. The surface averages 20 °C or more from July to August: comfortable for most swimmers.
The lake usually freezes over for about 115 days a year, from around 15 December to 8 April.
On the shore, afternoons reach 26 °C on average in July and -5 °C in January. The driest month is February (55 mm of rain), the wettest June (113 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (126 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 | -14 | 59 | 14 | 3.3 | 13 |
| February | Ice | — | -3 | -13 | 55 | 12 | 5.0 | 14 |
| March | Ice | — | 3 | -7 | 64 | 13 | 6.2 | 13 |
| April | 2 | 6 | 11 | 0 | 86 | 14 | 6.4 | 12 |
| May | 11 | 14 | 19 | 8 | 92 | 15 | 7.1 | 10 |
| June | 18 | 21 | 23 | 13 | 113 | 17 | 7.8 | 9 |
| July | 22 | 22 | 26 | 16 | 97 | 18 | 8.4 | 8 |
| August | 22 | 22 | 26 | 16 | 92 | 16 | 7.7 | 8 |
| September | 20 | 21 | 22 | 11 | 87 | 14 | 6.5 | 9 |
| October | 15 | 18 | 14 | 5 | 109 | 15 | 3.8 | 10 |
| November | 8 | 12 | 6 | -2 | 70 | 14 | 2.7 | 11 |
| December | Ice | — | -1 | -9 | 79 | 14 | 2.0 | 11 |
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 1 days before flowing out.
- Its catchment drains 781,910 km² of land.
- About 8,060 m³ of water flow out every second, on average.
- Its shoreline is 5.8 times longer than a circle of the same area: plenty of bays and inlets.
Around the shore
What's around Lake Saint Francis
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 6beaches and swimming spots
Plage de Saint-Zotique, Plage de Saint-Anicet and 4 more
- 12campsites
T & I Campground Resort, Cameron's Point Family Campground, Camping Tepee, Camping St-Anicet, Lancaster Park Outdoor Resort and 7 more
- —boat hire and water-sport clubs
- 18marinas and slipways
Marina Côteau-du-Lac, Creg Quay, Quai fédéral de Valleyfield, Marina Adams, Marina de Valleyfield and 13 more
- —ferry piers
- 4viewpoints
Belvédère Madeleine-Parent
- 9hotels, B&Bs and chalets
Monte Carlo Motel, Flotel, Hôtel Plaza Valleyfield, DEV Hotel & Conference Centre, Hôtel Victoria and 4 more
- —fishing spots
- 71restaurants and cafés
Towns on the shore
- Cornwall48,821 people
- Salaberry-de-Valleyfield42,787 people
- Saint-Zotique6,773 people
Nearest airport with scheduled flights: Montreal / Pierre Elliott Trudeau International Airport (YUL), 46 km in a straight line.
Car hire at YUL airport (Montréal)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 | -4.7 | -3.1 | 2.7 | 11.1 | 18.7 | 23.2 | 26.1 | 25.6 | 22.1 | 13.5 | 6.0 | -1.3 |
| 2020 | +2.1 | +1.0 | +3.0 | −2.2 | −0.9 | +1.8 | +3.3 | +0.4 | −1.0 | −0.4 | +2.9 | +2.3 |
| 2021 | +0.2 | −1.7 | +3.5 | +2.0 | +0.7 | +3.0 | −0.9 | +2.9 | +0.3 | +3.1 | +0.1 | +2.4 |
| 2022 | −2.0 | +1.4 | +1.4 | −0.1 | +2.6 | +0.2 | +0.7 | +1.4 | −0.9 | +2.6 | +2.3 | +2.0 |
| 2023 | +2.5 | +2.6 | +0.4 | +2.4 | +0.3 | −0.1 | +0.7 | −1.1 | +1.5 | +2.4 | −1.4 | +2.7 |
| 2024 | +1.9 | +4.5 | +3.4 | +0.9 | +2.1 | +1.4 | +1.3 | −0.6 | +1.4 | +2.2 | +2.0 | +0.2 |
| 2025 | −0.8 | −1.9 | +3.5 | +0.9 | −0.4 | +2.1 | +2.6 | +1.3 | +1.3 | +2.6 | −2.6 | −1.9 |
+1 warmer than usual −1 cooler than usual
Nearby
More lakes nearby
Canada153 km² · 31 km away24°maxLac Saint-LouisCanada151 km² · 35 km away22°maxLake ChamplainCanada1,141 km² · 109 km away23°maxLake MemphremagogCanada90.7 km² · 155 km away22°maxLake GeorgeUnited States113 km² · 175 km away24°maxLake OntarioUnited States19,347 km² · 319 km away22°maxAbout 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 (Q22352699) · 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.
