Last updated: June 24, 2025
In Hartford, United States, the average temperature in December hovers around -1°C (30°F). Expect a chilling minimum of -28°C (-18°F) and a relatively mild maximum of 15°C (60°F). During this month, anticipate 94 mm (3.7 in) of precipitation spread over 11 days, coupled with an average humidity of 84%. Stay warm and prepared!
In December in Hartford, the average temperature is -1°C (30°F), with maximums reaching 15°C (60°F) and minimums dropping as low as -28°C (-18°F). It's advisable to pack warm clothing and be prepared for significant temperature fluctuations if you plan to travel during this time.
In Hartford in December, the precipitation amount is 94 mm (3.7 in) over the course of 11 days.
In Hartford in December, humidity is 84%. With an average temperature of -1°C (30°F), this humidity feels like a sharp chill that seeps into your bones, making travel uncomfortable as the wetness in the air intensifies the cold, leaving you yearning for warmth and shelter.
In Hartford 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 Hartford, you can visit Hourly UV Index in Hartford.
UV Risk Categories
Weather in Hartford varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Hartford, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 78 mm (3.1 inches) | 89% | moderate |
| February Weather | -3°C (27°F) | 91 mm (3.6 inches) | 88% | moderate |
| March Weather | 1°C (34°F) | 72 mm (2.9 inches) | 86% | high |
| April Weather | 8°C (47°F) | 119 mm (4.7 inches) | 84% | very high |
| May Weather | 15°C (59°F) | 85 mm (3.3 inches) | 76% | very high |
| June Weather | 20°C (68°F) | 83 mm (3.3 inches) | 72% | very high |
| July Weather | 23°C (73°F) | 114 mm (4.5 inches) | 66% | very high |
| August Weather | 22°C (71°F) | 84 mm (3.3 inches) | 64% | very high |
| September Weather | 18°C (64°F) | 76 mm (3.0 inches) | 72% | high |
| October Weather | 11°C (53°F) | 141 mm (5.6 inches) | 81% | moderate |
| November Weather | 3°C (38°F) | 104 mm (4.1 inches) | 87% | moderate |
| December Weather | -1°C (30°F) | 94 mm (3.7 inches) | 84% | low |