Weather in Lake Geneva: December
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Average day temperature: | 41.3°F |
| Average night temperature: | 34.9°F | |
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Sea water temperature: | 48.5°F |
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Number of sunny days: | 12 days |
| Day length: | 8.6 - 8.9 hours | |
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Number of days with precipitation: | 8 days |
| Precipitation totals: | 4.4 in. | |
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forecast
| Lake Geneva |
temperature
| Lake Geneva |
Air temperature in December, °F
The highest day temperature during December of 2025 was 52°F. At the same time the lowest night temperature was 30°F. Daily and nightly averages during December were 45.5°F and 40.2°F.
Sea water temperature in Lake Geneva in December, °F
The average sea water temperature in December of 2025 was 48.6°F. The highest and lowest sea temperatures during the month were 50.0°F and 46.2°F.
Number of sunny, partly cloudy and cloudy days in December is almost equal.
Precipitation total in December, in.
Precipitation total value in Lake Geneva in December is 4.6 in. Other months of the year show relatively similar values.
The average wind speed value in December is 5.6 mph
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 4.2.
Best time for vacation in Lake Geneva
Lake Geneva on a weather map
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