Last updated: June 24, 2025
In December, the average temperature in Seneca, United States hovers around 0°C (33°F), with extremes ranging from a chilly -18°C (0°F) to a milder 16°C (62°F). During this period, expect about 108 mm (4.2 in) of precipitation spread over 14 days, contributing to an average humidity of a humid 88%.
In December in Seneca, the average temperature is 0°C (33°F). The maximum can reach 16°C (62°F), and the minimum can be as low as -18°C (0°F). Be prepared for a wide range of temperatures while traveling during this month.
In Seneca in December, the total precipitation amount is 108 mm (4.2 in) spread over 14 days.
In Seneca in December, humidity is 88%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and requiring extra layers to stay warm and dry.
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 (27°F) | 103 mm (4.0 inches) | 89% | moderate |
| February Weather | -1°C (30°F) | 113 mm (4.4 inches) | 90% | moderate |
| March Weather | 3°C (37°F) | 111 mm (4.4 inches) | 89% | high |
| April Weather | 8°C (47°F) | 137 mm (5.4 inches) | 88% | very high |
| May Weather | 15°C (59°F) | 152 mm (6.0 inches) | 80% | very high |
| June Weather | 19°C (67°F) | 145 mm (5.7 inches) | 79% | very high |
| July Weather | 22°C (72°F) | 147 mm (5.8 inches) | 74% | very high |
| August Weather | 21°C (70°F) | 113 mm (4.4 inches) | 64% | very high |
| September Weather | 18°C (64°F) | 110 mm (4.3 inches) | 67% | very high |
| October Weather | 12°C (54°F) | 128 mm (5.0 inches) | 81% | high |
| November Weather | 4°C (39°F) | 110 mm (4.3 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 108 mm (4.2 inches) | 88% | low |