Last updated: June 24, 2025
In December, the average temperature in Tappan, United States hovers around 3°C (37°F). Expect chilly nights with minimums dropping to -12°C (11°F), while daytime highs can reach a comfortable 17°C (63°F). Rainfall is likely, with an average precipitation of 109 mm (4.3 in) spread over 11 days, and humidity levels high at 80%. Prepare accordingly for a brisk and damp month!
In December in Tappan, the average temperature is 3°C (37°F), with maximums reaching 17°C (63°F) and minimums dropping as low as -12°C (11°F). Travelers should be prepared for a wide range of temperatures, so packing layers is essential.
In Tappan in December, the precipitation amount is 109 mm (4.3 in), occurring over a span of 11 days.
In Tappan in December, humidity is 80%. With an average temperature of 3°C (37°F), this humidity feels like a damp blanket wrapping around you, making outdoor adventures less enjoyable and prompting you to seek cozy indoor activities instead.
In Tappan 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 Tappan, you can visit Hourly UV Index in Tappan.
UV Risk Categories
Weather in Tappan varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Tappan, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 69 mm (2.7 inches) | 84% | moderate |
| February Weather | 2°C (35°F) | 98 mm (3.9 inches) | 82% | moderate |
| March Weather | 5°C (41°F) | 93 mm (3.7 inches) | 81% | high |
| April Weather | 10°C (51°F) | 114 mm (4.5 inches) | 78% | very high |
| May Weather | 16°C (61°F) | 121 mm (4.8 inches) | 69% | very high |
| June Weather | 21°C (71°F) | 95 mm (3.7 inches) | 69% | very high |
| July Weather | 25°C (77°F) | 149 mm (5.9 inches) | 62% | very high |
| August Weather | 24°C (75°F) | 129 mm (5.1 inches) | 65% | very high |
| September Weather | 20°C (69°F) | 106 mm (4.2 inches) | 68% | very high |
| October Weather | 15°C (59°F) | 135 mm (5.3 inches) | 74% | high |
| November Weather | 7°C (45°F) | 86 mm (3.4 inches) | 82% | moderate |
| December Weather | 3°C (37°F) | 109 mm (4.3 inches) | 80% | low |