Last updated: June 24, 2025
In December, the average temperature in Fillmore, United States hovers around -3°C (27°F). However, be prepared for a range that can plunge to a chilling -22°C (-8°F) and peak at a mild 16°C (60°F). Expect some moisture, as the area receives about 43 mm (1.7 in) of precipitation over 8 days, contributing to an average humidity level of 87%.
In December in Fillmore, the average temperature is -3°C (27°F), with maximums reaching 16°C (60°F) and minimums plunging as low as -22°C (-8°F). It's advisable to pack warm clothing and be prepared for sudden temperature fluctuations while traveling during this time.
In Fillmore in December, the total precipitation amount is 43 mm (1.7 in) over the course of 8 days.
In Fillmore in December humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.
In Fillmore 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 Fillmore, you can check the information here.
UV Risk Categories
Weather in Fillmore varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Fillmore, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -4°C (26°F) | 44 mm (1.7 inches) | 87% | moderate |
| February Weather | -2°C (29°F) | 53 mm (2.1 inches) | 88% | high |
| March Weather | 3°C (38°F) | 63 mm (2.5 inches) | 77% | very high |
| April Weather | 8°C (47°F) | 48 mm (1.9 inches) | 69% | very high |
| May Weather | 14°C (57°F) | 45 mm (1.8 inches) | 54% | extreme |
| June Weather | 22°C (71°F) | 7 mm (0.3 inches) | 45% | extreme |
| July Weather | 26°C (78°F) | 13 mm (0.5 inches) | 37% | extreme |
| August Weather | 24°C (76°F) | 16 mm (0.6 inches) | 34% | extreme |
| September Weather | 19°C (66°F) | 17 mm (0.7 inches) | 47% | very high |
| October Weather | 9°C (48°F) | 41 mm (1.6 inches) | 67% | high |
| November Weather | 4°C (40°F) | 31 mm (1.2 inches) | 82% | moderate |
| December Weather | -3°C (27°F) | 43 mm (1.7 inches) | 87% | moderate |