Last updated: June 24, 2025
In Caldwell, United States, the average temperature in December is a brisk 3°C (38°F). You might experience a range from a chilly minimum of -15°C (6°F) to a mild maximum of 18°C (65°F). Expect around 116 mm (4.6 in) of precipitation spread across 12 days, contributing to an average humidity of 86%. Be prepared for some cozy, wet days!
In December in Caldwell, the average temperature is 3°C (38°F). Maximums can reach 18°C (65°F), while minimums can drop as low as -15°C (6°F). Be prepared for a wide range of temperatures when traveling during this month.
In Caldwell in December, the precipitation amount is 116 mm (4.6 in) over a span of 12 days.
In Caldwell in December humidity is 86%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps through your layers, making traveling uncomfortable as breath clouds visibly in the crisp air.
In Caldwell in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Caldwell, you can check the information here.
UV Risk Categories
Weather in Caldwell varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Caldwell, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 0°C (32°F) | 91 mm (3.6 inches) | 88% | moderate |
| February Weather | 2°C (37°F) | 123 mm (4.8 inches) | 88% | moderate |
| March Weather | 6°C (44°F) | 122 mm (4.8 inches) | 88% | high |
| April Weather | 12°C (53°F) | 143 mm (5.6 inches) | 86% | very high |
| May Weather | 18°C (64°F) | 147 mm (5.8 inches) | 82% | very high |
| June Weather | 22°C (71°F) | 169 mm (6.7 inches) | 84% | very high |
| July Weather | 24°C (76°F) | 126 mm (4.9 inches) | 82% | very high |
| August Weather | 23°C (74°F) | 106 mm (4.2 inches) | 73% | very high |
| September Weather | 20°C (69°F) | 109 mm (4.3 inches) | 73% | very high |
| October Weather | 15°C (58°F) | 113 mm (4.5 inches) | 81% | high |
| November Weather | 6°C (43°F) | 90 mm (3.6 inches) | 89% | moderate |
| December Weather | 3°C (38°F) | 116 mm (4.6 inches) | 86% | moderate |