Last updated: June 24, 2025
In December, the average temperature in Chambersburg, United States hovers around 2°C (37°F). Expect chilly days with a minimum temperature dipping as low as -13°C (9°F), while the mercury can rise to a comfortable 18°C (65°F) on warmer days. Precipitation totals around 93 mm (3.7 in) spread over 9 days, contributing to a high average humidity of 85%. Prepare for a typical month of cool weather and occasional rain!
In December in Chambersburg, the average temperature is 2°C (37°F). Maximums can reach 18°C (65°F), while minimums can be as low as -13°C (9°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.
In Chambersburg in December, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.
In Chambersburg in December, humidity is 85%. With an average temperature of 2°C (37°F), this humidity feels like a damp chill that seeps into your bones, making outdoor excursions feel much colder than the thermometer suggests.
In Chambersburg 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 Chambersburg, you can visit Hourly UV Index in Chambersburg.
UV Risk Categories
Weather in Chambersburg varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Chambersburg, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 61 mm (2.4 inches) | 86% | moderate |
| February Weather | 2°C (36°F) | 99 mm (3.9 inches) | 86% | moderate |
| March Weather | 5°C (42°F) | 90 mm (3.5 inches) | 86% | high |
| April Weather | 11°C (53°F) | 106 mm (4.2 inches) | 84% | very high |
| May Weather | 17°C (63°F) | 117 mm (4.6 inches) | 78% | very high |
| June Weather | 22°C (71°F) | 92 mm (3.6 inches) | 79% | very high |
| July Weather | 25°C (77°F) | 128 mm (5.0 inches) | 70% | very high |
| August Weather | 24°C (75°F) | 93 mm (3.7 inches) | 59% | very high |
| September Weather | 20°C (68°F) | 124 mm (4.9 inches) | 68% | very high |
| October Weather | 14°C (58°F) | 108 mm (4.3 inches) | 80% | high |
| November Weather | 6°C (43°F) | 82 mm (3.2 inches) | 86% | moderate |
| December Weather | 2°C (37°F) | 93 mm (3.7 inches) | 85% | low |