Last updated: June 24, 2025
In Redlands, United States, the average temperature in December hovers around -2°C (29°F), with a notable range that can dip to a chilling -21°C (-5°F) or soar to a mild 15°C (59°F). Expect about 37 mm (1.5 in) of precipitation spread over 6 days, accompanied by a high average humidity of 90%, creating a crisp, damp atmosphere.
In December in Redlands, the average temperature is -2°C (29°F). The maximum can reach 15°C (59°F), and the minimum can be as low as -21°C (-5°F). Be prepared for a wide range of temperatures and pack accordingly when traveling to Redlands this December.
In Redlands in December, the precipitation amount is 37 mm (1.5 in) over the course of 6 days.
In Redlands in December, humidity is 90%. With an average temperature of -2°C (29°F), this humidity feels like an icy breath enveloping you, making every step outdoors feel even colder and more biting, while also creating a heavy, wet atmosphere that can dampen your spirits for traveling.
In Redlands 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 Redlands, you can check the information here.
UV Risk Categories
Weather in Redlands varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Redlands, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (25°F) | 39 mm (1.5 inches) | 90% | moderate |
| February Weather | -1°C (30°F) | 49 mm (1.9 inches) | 89% | high |
| March Weather | 4°C (40°F) | 68 mm (2.7 inches) | 81% | very high |
| April Weather | 10°C (50°F) | 30 mm (1.2 inches) | 74% | very high |
| May Weather | 15°C (60°F) | 43 mm (1.7 inches) | 58% | extreme |
| June Weather | 22°C (72°F) | 26 mm (1.0 inches) | 47% | extreme |
| July Weather | 25°C (77°F) | 34 mm (1.3 inches) | 39% | extreme |
| August Weather | 24°C (75°F) | 29 mm (1.2 inches) | 39% | extreme |
| September Weather | 19°C (66°F) | 39 mm (1.5 inches) | 53% | very high |
| October Weather | 9°C (49°F) | 55 mm (2.2 inches) | 72% | high |
| November Weather | 4°C (40°F) | 22 mm (0.9 inches) | 84% | moderate |
| December Weather | -2°C (29°F) | 37 mm (1.5 inches) | 90% | moderate |