Last updated: June 24, 2025
In Jacksonville, United States, the average temperature in December hovers around 3°C (38°F). Expect chilly nights with a minimum of -6°C (22°F), while daytime highs can reach up to 17°C (63°F). The month brings about 107 mm (4.2 in) of precipitation spread across 14 days, resulting in a notably high average humidity of 87%. Prepare for a damp and cool atmosphere!
In December in Jacksonville, the average temperature is 3°C (38°F). The maximum can reach 17°C (63°F), while the minimum can drop as low as -6°C (22°F). It's advisable to pack layers for your trip to ensure comfort in varying temperatures.
In Jacksonville in December, the precipitation amount is 107 mm (4.2 in) spread over a period of 14 days.
In Jacksonville in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.
In Jacksonville 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 Jacksonville, you can visit Hourly UV Index in Jacksonville.
UV Risk Categories
Weather in Jacksonville varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Jacksonville, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (40°F) | 131 mm (5.2 inches) | 84% | moderate |
| February Weather | 4°C (40°F) | 142 mm (5.6 inches) | 85% | moderate |
| March Weather | 6°C (44°F) | 117 mm (4.6 inches) | 86% | high |
| April Weather | 10°C (49°F) | 94 mm (3.7 inches) | 83% | very high |
| May Weather | 13°C (56°F) | 64 mm (2.5 inches) | 83% | very high |
| June Weather | 18°C (64°F) | 31 mm (1.2 inches) | 83% | extreme |
| July Weather | 22°C (71°F) | 3 mm (0.1 inches) | 78% | very high |
| August Weather | 21°C (71°F) | 8 mm (0.3 inches) | 67% | very high |
| September Weather | 17°C (63°F) | 42 mm (1.7 inches) | 66% | very high |
| October Weather | 11°C (52°F) | 45 mm (1.8 inches) | 77% | high |
| November Weather | 7°C (44°F) | 90 mm (3.5 inches) | 87% | moderate |
| December Weather | 3°C (38°F) | 107 mm (4.2 inches) | 87% | low |