Last updated: June 24, 2025
In December, the average temperature in Darien, United States hovers around -1°C (31°F). Expect chilly nights, with minimum temperatures dropping to a frigid -22°C (-7°F), while daytime highs can reach a mild 19°C (66°F). Precipitation is moderate, totaling 52 mm (2.0 in) over approximately 7 days, and the atmosphere tends to be quite damp, with an average humidity of 81%.
In December in Darien, the average temperature is -1°C (31°F), with a maximum reaching 19°C (66°F) and a minimum plummeting to -22°C (-7°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack appropriately for both warmth and cooler conditions.
In Darien in December, the precipitation amount is 52 mm (2.0 in) over a duration of 7 days.
In Darien in December humidity is 81%. With an average temperature of -1°C (31°F), this humidity feels like a heavy, cold mist that clings to your skin, making outdoor adventures damp and challenging.
In Darien 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 Darien, you can visit Hourly UV Index in Darien.
UV Risk Categories
Weather in Darien varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Darien, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -5°C (23°F) | 60 mm (2.4 inches) | 85% | moderate |
| February Weather | -4°C (25°F) | 56 mm (2.2 inches) | 85% | moderate |
| March Weather | 3°C (37°F) | 64 mm (2.5 inches) | 85% | high |
| April Weather | 8°C (47°F) | 105 mm (4.1 inches) | 85% | very high |
| May Weather | 15°C (60°F) | 147 mm (5.8 inches) | 78% | very high |
| June Weather | 22°C (71°F) | 108 mm (4.2 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 75 mm (3.0 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 87 mm (3.4 inches) | 76% | very high |
| September Weather | 19°C (66°F) | 106 mm (4.2 inches) | 79% | very high |
| October Weather | 11°C (53°F) | 112 mm (4.4 inches) | 83% | moderate |
| November Weather | 3°C (37°F) | 48 mm (1.9 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 52 mm (2.0 inches) | 81% | low |