Flathead Lake vs Kootenay Lake
Kootenay Lake is the warmer swim right now at about 16.5°C. They are roughly 289 km apart in United States and Canada.
Flathead Lake
Montana
15.8°C
mild · modelled estimate
- October average
- 15.8°C
- Warmest month
- August · 20.0°C
- Coldest month
- 3.0°C
- Swim season
- July–September
The largest freshwater lake west of the Mississippi, cool and crystal clear.
Kootenay Lake
British Columbia
16.5°C
mild · modelled estimate
- October average
- 16.5°C
- Warmest month
- August · 21.0°C
- Coldest month
- 3.0°C
- Swim season
- July–September
Kootenay Lake in British Columbia, Canada is swimmable in high summer, brisk either side of it, and drops close to single digits in winter.
Month by month
| Lake | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Flathead Lake | 4.1°C | 3.0°C | 4.1°C | 7.3°C | 11.5°C | 15.8°C | 18.9°C | 20.0°C | 18.9°C | 15.8°C | 11.5°C | 7.3°C |
| Kootenay Lake | 4.2°C | 3.0°C | 4.2°C | 7.5°C | 12.0°C | 16.5°C | 19.8°C | 21.0°C | 19.8°C | 16.5°C | 12.0°C | 7.5°C |
Monthly values are modelled from each lake's long-term winter and summer envelope, then refined with today's forecast air temperature for the headline reading.
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