Last updated: June 24, 2025
In December, the average temperature in Pleasant Hill, United States hovers around 2°C (36°F). Be prepared for a chilly range, as temperatures can dip as low as -18°C (0°F) and soar up to 18°C (65°F). During this time, expect approximately 87 mm (3.4 in) of precipitation over about 10 days, all while the air remains notably humid with an average of 87% humidity.
In December in Pleasant Hill, the average temperature is 2°C (36°F), with maximums reaching up to 18°C (65°F) and minimums plunging as low as -18°C (0°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both mild days and cold nights.
In Pleasant Hill in December, the precipitation amount is 87 mm (3.4 in) over the course of 10 days.
In Pleasant Hill in December, humidity is 87%. With an average temperature of 2°C (36°F), this humidity feels like an unwelcome chill that seeps into your bones, making outdoor exploration feel damp and heavy, and encouraging travelers to seek the warmth of indoor attractions instead.
In Pleasant Hill 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 Pleasant Hill, you can check the information here.
UV Risk Categories
Weather in Pleasant Hill varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Pleasant Hill, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -1°C (31°F) | 72 mm (2.8 inches) | 88% | moderate |
| February Weather | 1°C (34°F) | 97 mm (3.8 inches) | 88% | moderate |
| March Weather | 6°C (42°F) | 106 mm (4.2 inches) | 87% | high |
| April Weather | 11°C (52°F) | 98 mm (3.9 inches) | 85% | very high |
| May Weather | 18°C (64°F) | 129 mm (5.1 inches) | 81% | very high |
| June Weather | 22°C (72°F) | 120 mm (4.7 inches) | 82% | very high |
| July Weather | 24°C (76°F) | 100 mm (3.9 inches) | 81% | very high |
| August Weather | 23°C (74°F) | 90 mm (3.5 inches) | 73% | very high |
| September Weather | 21°C (69°F) | 86 mm (3.4 inches) | 73% | very high |
| October Weather | 14°C (58°F) | 99 mm (3.9 inches) | 78% | high |
| November Weather | 5°C (42°F) | 94 mm (3.7 inches) | 89% | moderate |
| December Weather | 2°C (36°F) | 87 mm (3.4 inches) | 87% | moderate |