Last updated: June 24, 2025
In December, the average temperature in Gridley, United States hovers around 1°C (34°F). Expect chilly nights, with minimums plummeting to -21°C (-5°F), while daytime brings a mild maximum of 20°C (68°F). Precipitation levels reach 55 mm (2.1 in) over the course of 7 days, and the air remains quite humid, with an average humidity of 84%. Be prepared for a mix of weather!
In December in Gridley, the average temperature is 1°C (34°F). The maximum can reach 20°C (68°F) and the minimum can be as low as -21°C (-5°F). This variation in temperatures makes Gridley an intriguing destination for travelers, offering a mix of chilly days and surprisingly warm spells.
In Gridley in December, the total precipitation amount reaches 55 mm (2.1 in) over the course of 7 days.
In Gridley in December humidity is 84%. With an average temperature of 1°C (34°F), this humidity feels like a biting chill that seeps into your bones, making travel uncomfortable and requiring extra layers to keep warm while navigating the damp air.
In Gridley in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Gridley, you can visit Hourly UV Index in Gridley.
UV Risk Categories
Weather in Gridley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Gridley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 61 mm (2.4 inches) | 82% | moderate |
| February Weather | -2°C (29°F) | 68 mm (2.7 inches) | 83% | moderate |
| March Weather | 5°C (42°F) | 105 mm (4.1 inches) | 84% | high |
| April Weather | 10°C (51°F) | 116 mm (4.6 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 161 mm (6.3 inches) | 79% | very high |
| June Weather | 23°C (74°F) | 126 mm (5.0 inches) | 82% | extreme |
| July Weather | 25°C (77°F) | 106 mm (4.2 inches) | 80% | very high |
| August Weather | 23°C (74°F) | 87 mm (3.4 inches) | 81% | very high |
| September Weather | 21°C (70°F) | 67 mm (2.7 inches) | 80% | very high |
| October Weather | 13°C (56°F) | 127 mm (5.0 inches) | 82% | high |
| November Weather | 5°C (40°F) | 57 mm (2.2 inches) | 88% | moderate |
| December Weather | 1°C (34°F) | 55 mm (2.1 inches) | 84% | low |