Last updated: June 24, 2025
In Hartford, United States, the average temperature in December hovers around -3°C (26°F), with a notable range from a chilly -24°C (-11°F) to a milder 16°C (61°F). This month typically experiences 39 mm (1.5 in) of precipitation spread over 4 days, contributing to an average humidity of 83%. Be prepared for some cold, damp days!
In December in Hartford, the average temperature is -3°C (26°F), with maximums reaching 16°C (61°F) and minimums plunging as low as -24°C (-11°F). It's essential for travelers to prepare for a wide range of temperatures and dress in layers to stay comfortable during their visit.
In Hartford in December, the precipitation amount is 39 mm (1.5 in) spread over a period of 4 days.
In Hartford in December, humidity is 83%. With an average temperature of -3°C (26°F), this humidity feels like a heavy blanket of cold air enveloping you, making it challenging to stay warm while traveling. The dampness seeps into your clothing, creating an uncomfortable chill that lingers even indoors, often requiring extra layers and careful planning for outdoor activities.
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 | -7°C (20°F) | 20 mm (0.8 inches) | 80% | low |
| February Weather | -7°C (20°F) | 23 mm (0.9 inches) | 84% | moderate |
| March Weather | 2°C (35°F) | 65 mm (2.5 inches) | 75% | moderate |
| April Weather | 7°C (45°F) | 80 mm (3.2 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 127 mm (5.0 inches) | 74% | very high |
| June Weather | 23°C (73°F) | 83 mm (3.3 inches) | 81% | extreme |
| July Weather | 24°C (76°F) | 81 mm (3.2 inches) | 82% | very high |
| August Weather | 22°C (72°F) | 95 mm (3.7 inches) | 80% | very high |
| September Weather | 18°C (66°F) | 102 mm (4.0 inches) | 75% | very high |
| October Weather | 9°C (48°F) | 77 mm (3.1 inches) | 77% | moderate |
| November Weather | 1°C (35°F) | 24 mm (1.0 inches) | 85% | moderate |
| December Weather | -3°C (26°F) | 39 mm (1.5 inches) | 83% | low |