Last updated: June 24, 2025
In December, the average temperature in Clayton, United States hovers around 3°C (38°F). However, be prepared for some variation, as temperatures can dip as low as -14°C (7°F) or rise to a pleasant 23°C (74°F). During this time, you can expect 13 mm (0.5 in) of precipitation over the course of about 3 days, and the average humidity sits at a comfortable 78%.
In December in Clayton, the average temperature is 3°C (38°F). Maximums can reach 23°C (74°F) and minimums can drop as low as -14°C (7°F). Travelers should be prepared for a wide range of temperatures, from chilly days to surprisingly warm afternoons.
In Clayton in December, the precipitation amount is 13 mm (0.5 in) over a span of 3 days.
In Clayton in December humidity is 78%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapping around you, making travel quite uncomfortable as every breath seems to draw in dampness, and your clothes cling to you, adding an extra weight to your steps.
In Clayton 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 Clayton for better planning.
UV Risk Categories
Weather in Clayton varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Clayton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 2°C (36°F) | 15 mm (0.6 inches) | 73% | moderate |
| February Weather | 3°C (37°F) | 10 mm (0.4 inches) | 76% | high |
| March Weather | 8°C (47°F) | 34 mm (1.4 inches) | 64% | very high |
| April Weather | 12°C (53°F) | 37 mm (1.5 inches) | 61% | extreme |
| May Weather | 17°C (63°F) | 50 mm (2.0 inches) | 71% | extreme |
| June Weather | 23°C (74°F) | 34 mm (1.3 inches) | 75% | extreme |
| July Weather | 25°C (76°F) | 45 mm (1.8 inches) | 75% | extreme |
| August Weather | 23°C (74°F) | 56 mm (2.2 inches) | 80% | extreme |
| September Weather | 20°C (69°F) | 39 mm (1.5 inches) | 80% | very high |
| October Weather | 13°C (55°F) | 35 mm (1.4 inches) | 78% | very high |
| November Weather | 8°C (46°F) | 9 mm (0.4 inches) | 76% | moderate |
| December Weather | 3°C (38°F) | 13 mm (0.5 inches) | 78% | moderate |