Last updated: June 24, 2025
In Duncannon, United States, the average temperature for December hovers around 3°C (37°F). However, you can expect a range from a chilly -12°C (10°F) to a mild 18°C (64°F). This month also sees about 88 mm (3.5 in) of precipitation over approximately 10 days, with humidity levels averaging a brisk 85%. Prepare for a chilly yet intriguing weather experience!
In December in Duncannon, the average temperature is 3°C (37°F). The maximum can reach 18°C (64°F), and the minimum can be as low as -12°C (10°F). Travelers should be prepared for a wide range of temperatures and dress in layers to stay comfortable.
In Duncannon in December, the precipitation amount is 88 mm (3.5 in) spread over a duration of 10 days.
In Duncannon in December, humidity is 85%. With an average temperature of 3°C (37°F), this humidity feels like a chilling blanket enveloping you, making traveling uncomfortable as your clothes cling to your skin and the cold air bites at your face.
In Duncannon 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 Duncannon, you can visit Hourly UV Index in Duncannon.
UV Risk Categories
Weather in Duncannon varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Duncannon, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (33°F) | 68 mm (2.7 inches) | 87% | moderate |
| February Weather | 2°C (35°F) | 100 mm (3.9 inches) | 85% | moderate |
| March Weather | 5°C (42°F) | 92 mm (3.6 inches) | 85% | high |
| April Weather | 11°C (52°F) | 104 mm (4.1 inches) | 83% | very high |
| May Weather | 17°C (63°F) | 120 mm (4.7 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 90 mm (3.5 inches) | 73% | very high |
| July Weather | 25°C (77°F) | 122 mm (4.8 inches) | 65% | very high |
| August Weather | 24°C (75°F) | 102 mm (4.0 inches) | 62% | very high |
| September Weather | 20°C (69°F) | 122 mm (4.8 inches) | 66% | very high |
| October Weather | 15°C (59°F) | 113 mm (4.4 inches) | 79% | high |
| November Weather | 6°C (44°F) | 89 mm (3.5 inches) | 87% | moderate |
| December Weather | 3°C (37°F) | 88 mm (3.5 inches) | 85% | low |