Last updated: June 24, 2025
In December, the average temperature in Carbondale, United States hovers around -6°C (21°F), with extremes ranging from a frigid -28°C (-19°F) to a mild 12°C (54°F). Expect around 66 mm (2.6 in) of precipitation spread over 11 days, and brace yourself for an average humidity of 89% that can make the cold feel even more biting.
In December in Carbondale, the average temperature is -6°C (21°F), with maximums reaching 12°C (54°F) and minimums dropping as low as -28°C (-19°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both cold and mild weather.
In Carbondale in December, the precipitation amount is 66 mm (2.6 in) spread over 11 days.
In Carbondale in December, humidity is 89%. With an average temperature of -6°C (21°F), this humidity feels like an uncomfortable chill that seeps into your bones, making traveling outdoors an arduous task as the cold air mixes with dampness, often leaving you feeling cold and clammy despite layers of clothing.
In Carbondale in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Carbondale for better planning.
UV Risk Categories
Weather in Carbondale varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Carbondale, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 62 mm (2.5 inches) | 88% | moderate |
| February Weather | -4°C (24°F) | 85 mm (3.3 inches) | 87% | high |
| March Weather | 0°C (33°F) | 69 mm (2.7 inches) | 81% | very high |
| April Weather | 3°C (37°F) | 53 mm (2.1 inches) | 76% | extreme |
| May Weather | 8°C (47°F) | 52 mm (2.1 inches) | 66% | extreme |
| June Weather | 16°C (61°F) | 23 mm (0.9 inches) | 58% | extreme |
| July Weather | 20°C (68°F) | 16 mm (0.6 inches) | 52% | extreme |
| August Weather | 19°C (66°F) | 16 mm (0.6 inches) | 56% | extreme |
| September Weather | 15°C (58°F) | 19 mm (0.7 inches) | 65% | very high |
| October Weather | 5°C (41°F) | 67 mm (2.6 inches) | 76% | high |
| November Weather | -1°C (30°F) | 52 mm (2.0 inches) | 82% | moderate |
| December Weather | -6°C (21°F) | 66 mm (2.6 inches) | 89% | moderate |