Last updated: June 24, 2025
In December, the average temperature in Mechanicsburg, United States hovers around 3°C (38°F), with a possible minimum dipping to -12°C (11°F) and a charming maximum reaching 18°C (65°F). Be prepared for some precipitation, as you can expect about 88 mm (3.5 in) over 10 days. The air will feel quite damp, with an average humidity of 85%.
In December in Mechanicsburg, the average temperature is 3°C (38°F). The maximum can reach 18°C (65°F), while the minimum can drop as low as -12°C (11°F). This temperature variation means travelers should prepare for both chilly and milder conditions during their stay.
In Mechanicsburg in December, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.
In Mechanicsburg in December, humidity is 85%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities uncomfortable and travel less enjoyable as you contend with the heavy, cold air surrounding you.
In Mechanicsburg 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 Mechanicsburg, you can visit Hourly UV Index in Mechanicsburg.
UV Risk Categories
Weather in Mechanicsburg varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mechanicsburg, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 64 mm (2.5 inches) | 87% | moderate |
| February Weather | 3°C (37°F) | 99 mm (3.9 inches) | 85% | moderate |
| March Weather | 6°C (43°F) | 94 mm (3.7 inches) | 85% | high |
| April Weather | 12°C (53°F) | 102 mm (4.0 inches) | 83% | very high |
| May Weather | 17°C (63°F) | 121 mm (4.8 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 92 mm (3.6 inches) | 73% | very high |
| July Weather | 25°C (78°F) | 132 mm (5.2 inches) | 65% | very high |
| August Weather | 24°C (76°F) | 107 mm (4.2 inches) | 62% | very high |
| September Weather | 21°C (69°F) | 116 mm (4.6 inches) | 66% | very high |
| October Weather | 15°C (59°F) | 105 mm (4.1 inches) | 79% | high |
| November Weather | 7°C (45°F) | 86 mm (3.4 inches) | 87% | moderate |
| December Weather | 3°C (38°F) | 88 mm (3.5 inches) | 85% | low |