Last updated: June 24, 2025
In Bellevue, United States, the average temperature in December hovers around -1°C (31°F). Temperatures can range from a chilly -21°C (-6°F) at their lowest to a mild 20°C (69°F) at their highest. Expect around 45 mm (1.8 in) of precipitation over 6 days, contributing to an average humidity of 82%, creating a crisp and damp atmosphere.
In December in Bellevue, the average temperature is -1°C (31°F), with maximums reaching 20°C (69°F) and minimums dipping as low as -21°C (-6°F). Travelers should be prepared for a wide range of temperatures during this time.
In Bellevue in December, the precipitation amount is 45 mm (1.8 in) over the course of 6 days.
In Bellevue in December humidity is 82%. With an average temperature of -1°C (31°F), this humidity feels like a heavy, biting chill that seeps through layers of clothing, making outdoor activities uncomfortable and urging travelers to seek shelter or warm beverages to combat the cold.
In Bellevue 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 Bellevue, you can visit Hourly UV Index in Bellevue.
UV Risk Categories
Weather in Bellevue varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Bellevue, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (22°F) | 52 mm (2.1 inches) | 84% | moderate |
| February Weather | -5°C (24°F) | 59 mm (2.3 inches) | 85% | moderate |
| March Weather | 3°C (38°F) | 69 mm (2.7 inches) | 84% | high |
| April Weather | 9°C (48°F) | 91 mm (3.6 inches) | 83% | very high |
| May Weather | 16°C (61°F) | 150 mm (5.9 inches) | 75% | very high |
| June Weather | 22°C (72°F) | 129 mm (5.1 inches) | 79% | very high |
| July Weather | 24°C (76°F) | 78 mm (3.1 inches) | 75% | very high |
| August Weather | 22°C (72°F) | 103 mm (4.0 inches) | 69% | very high |
| September Weather | 19°C (67°F) | 116 mm (4.6 inches) | 74% | very high |
| October Weather | 11°C (52°F) | 115 mm (4.5 inches) | 79% | moderate |
| November Weather | 3°C (37°F) | 47 mm (1.8 inches) | 88% | moderate |
| December Weather | -1°C (31°F) | 45 mm (1.8 inches) | 82% | low |