Last updated: June 24, 2025
In December, the average temperature in Geneva-on-the-Lake, United States hovers around 2°C (35°F), with lows dipping to a brisk -17°C (3°F) and highs reaching a comfortable 17°C (63°F). Expect around 100 mm (4.0 in) of precipitation spread over approximately 15 days, contributing to an average humidity of 86%. Dress warmly and be prepared for wet conditions!
In December in Geneva-on-the-Lake, the average temperature is 2°C (35°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -17°C (3°F). Travelers should be prepared for a wide range of temperatures, ensuring they have both warm and cool clothing to stay comfortable during their visit.
In Geneva-on-the-Lake in December, the total precipitation amount is 100 mm (4.0 in) over the course of 15 days.
In Geneva-on-the-Lake in December humidity is 86%. With an average temperature of 2°C (35°F), this humidity feels like a damp chill that seeps into your bones, making traveling quite uncomfortable as your clothes cling to you and the cold air cuts through any warmth you try to find.
In Geneva-on-the-Lake in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Geneva-on-the-Lake, you can visit Hourly UV Index in Geneva-on-the-Lake.
UV Risk Categories
Weather in Geneva-on-the-Lake varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Geneva-on-the-Lake, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -2°C (30°F) | 88 mm (3.5 inches) | 88% | moderate |
| February Weather | 0°C (31°F) | 89 mm (3.5 inches) | 88% | moderate |
| March Weather | 3°C (38°F) | 90 mm (3.5 inches) | 87% | high |
| April Weather | 8°C (47°F) | 108 mm (4.2 inches) | 87% | very high |
| May Weather | 15°C (59°F) | 120 mm (4.7 inches) | 81% | very high |
| June Weather | 20°C (68°F) | 108 mm (4.2 inches) | 83% | very high |
| July Weather | 23°C (74°F) | 133 mm (5.2 inches) | 82% | very high |
| August Weather | 22°C (72°F) | 96 mm (3.8 inches) | 76% | very high |
| September Weather | 19°C (67°F) | 89 mm (3.5 inches) | 77% | very high |
| October Weather | 13°C (57°F) | 127 mm (5.0 inches) | 82% | high |
| November Weather | 5°C (42°F) | 104 mm (4.1 inches) | 89% | moderate |
| December Weather | 2°C (35°F) | 100 mm (4.0 inches) | 86% | low |