Last updated: June 24, 2025
In December, the average temperature in Seneca, United States hovers around 2°C (36°F), creating a chilly atmosphere. Minimum temperatures can plummet to -20°C (-3°F), while the mercury may rise to a pleasant 23°C (73°F) at times. Expect about 29 mm (1.1 in) of precipitation spread across 3 days, with an average humidity level of 84% adding to the region's moist climate.
In December, in Seneca, the average temperature is 2°C (36°F). The maximum can reach 23°C (73°F), while the minimum can drop as low as -20°C (-3°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.
In Seneca in December, the precipitation amount is 29 mm (1.1 in) over the course of 3 days.
In Seneca in December, humidity is 84%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making outdoor activities less inviting and requiring extra layers to stay comfortable while traveling.
In Seneca in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Seneca, you can check the information here.
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 | -2°C (29°F) | 34 mm (1.3 inches) | 76% | moderate |
| February Weather | -1°C (30°F) | 31 mm (1.2 inches) | 77% | moderate |
| March Weather | 7°C (45°F) | 96 mm (3.8 inches) | 70% | high |
| April Weather | 11°C (53°F) | 84 mm (3.3 inches) | 73% | very high |
| May Weather | 18°C (65°F) | 210 mm (8.3 inches) | 82% | very high |
| June Weather | 25°C (77°F) | 100 mm (3.9 inches) | 82% | extreme |
| July Weather | 26°C (80°F) | 72 mm (2.8 inches) | 81% | extreme |
| August Weather | 24°C (76°F) | 124 mm (4.9 inches) | 78% | very high |
| September Weather | 22°C (71°F) | 71 mm (2.8 inches) | 71% | very high |
| October Weather | 13°C (55°F) | 123 mm (4.8 inches) | 71% | high |
| November Weather | 6°C (43°F) | 37 mm (1.4 inches) | 81% | moderate |
| December Weather | 2°C (36°F) | 29 mm (1.1 inches) | 84% | moderate |