Last updated: June 24, 2025
In December, the average temperature in Valley Center, United States is a brisk 4°C (39°F), with temperatures ranging from a chilly -14°C (7°F) to a mild 24°C (75°F). During this time, expect about 32 mm (1.2 in) of precipitation over 3 days, contributing to an average humidity level of 85%. Prepare accordingly for a mix of cool weather and wet conditions!
In December in Valley Center, the average temperature is 4°C (39°F). Maximum temperatures can reach 24°C (75°F), while minimums can drop to as low as -14°C (7°F). This wide range of temperatures means that travelers should be prepared for both warm and cold weather conditions.
In Valley Center in December, the precipitation amount is 32 mm (1.2 in) over the course of 3 days.
In Valley Center in December, humidity is 85%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable and requiring extra layers to ward off the cold and moisture.
In Valley Center 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 Valley Center, you can check the information here.
UV Risk Categories
Weather in Valley Center varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Valley Center, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 1°C (34°F) | 38 mm (1.5 inches) | 77% | moderate |
| February Weather | 1°C (35°F) | 33 mm (1.3 inches) | 76% | high |
| March Weather | 9°C (49°F) | 85 mm (3.4 inches) | 71% | high |
| April Weather | 13°C (56°F) | 82 mm (3.2 inches) | 73% | very high |
| May Weather | 19°C (66°F) | 176 mm (6.9 inches) | 83% | very high |
| June Weather | 25°C (78°F) | 105 mm (4.1 inches) | 83% | extreme |
| July Weather | 27°C (81°F) | 76 mm (3.0 inches) | 81% | extreme |
| August Weather | 25°C (78°F) | 100 mm (4.0 inches) | 73% | very high |
| September Weather | 23°C (73°F) | 83 mm (3.3 inches) | 67% | very high |
| October Weather | 14°C (58°F) | 114 mm (4.5 inches) | 72% | high |
| November Weather | 8°C (46°F) | 26 mm (1.0 inches) | 82% | moderate |
| December Weather | 4°C (39°F) | 32 mm (1.2 inches) | 85% | moderate |