Last updated: June 24, 2025
In December, the average temperature in Seneca, United States hovers around 1°C (34°F). Be prepared for a chill, as temperatures can dip to a minimum of -21°C (-6°F), while the mercury may rise to a pleasant 20°C (67°F) on warmer days. During this month, expect 56 mm (2.2 in) of precipitation spread over approximately 7 days, with average humidity sitting at a high 84%.
In December in Seneca, the average temperature is 1°C (34°F). Maximum temperatures can reach up to 20°C (67°F), while minimums can drop as low as -21°C (-6°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!
In Seneca in December, the total precipitation amount is 56 mm (2.2 in) over a period of 7 days.
In Seneca in December humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.
In Seneca 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 Seneca, you can visit Hourly UV Index in Seneca.
UV Risk Categories
Weather in Seneca varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Seneca, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (26°F) | 64 mm (2.5 inches) | 82% | moderate |
| February Weather | -2°C (28°F) | 68 mm (2.7 inches) | 83% | moderate |
| March Weather | 5°C (41°F) | 93 mm (3.7 inches) | 84% | high |
| April Weather | 10°C (50°F) | 119 mm (4.7 inches) | 85% | very high |
| May Weather | 17°C (63°F) | 165 mm (6.5 inches) | 79% | very high |
| June Weather | 23°C (73°F) | 143 mm (5.6 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 101 mm (4.0 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 93 mm (3.6 inches) | 81% | very high |
| September Weather | 20°C (69°F) | 91 mm (3.6 inches) | 80% | very high |
| October Weather | 13°C (56°F) | 136 mm (5.4 inches) | 82% | high |
| November Weather | 4°C (40°F) | 58 mm (2.3 inches) | 88% | moderate |
| December Weather | 1°C (34°F) | 56 mm (2.2 inches) | 84% | low |