Last updated: June 24, 2025
In December, the average temperature in Mountain View, United States hovers around 7°C (45°F). Expect a minimum plunge to -11°C (13°F), while sunny days can reach a comfortable 26°C (78°F). With an average precipitation of 97 mm (3.8 in) spread over 8 days, the humidity remains high at 88%. Stay prepared for diverse weather conditions!
In December in Mountain View, the average temperature is 7°C (45°F), with maximums reaching up to 26°C (78°F) and minimums dropping as low as -11°C (13°F). Be prepared for fluctuating temperatures and pack accordingly for your travels.
In Mountain View in December, the total precipitation amount is 97 mm (3.8 in), occurring over a span of 8 days.
In Mountain View in December humidity is 88%. With an average temperature of 7°C (45°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through a heavy, thick atmosphere that clings to your skin.
In Mountain View 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 Mountain View, you can check the information here.
UV Risk Categories
Weather in Mountain View varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Mountain View, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 78 mm (3.1 inches) | 84% | moderate |
| February Weather | 6°C (42°F) | 131 mm (5.2 inches) | 83% | high |
| March Weather | 11°C (53°F) | 137 mm (5.4 inches) | 81% | very high |
| April Weather | 15°C (59°F) | 144 mm (5.7 inches) | 81% | very high |
| May Weather | 20°C (69°F) | 174 mm (6.9 inches) | 83% | extreme |
| June Weather | 25°C (77°F) | 100 mm (3.9 inches) | 83% | extreme |
| July Weather | 27°C (81°F) | 89 mm (3.5 inches) | 81% | extreme |
| August Weather | 26°C (79°F) | 116 mm (4.6 inches) | 74% | very high |
| September Weather | 23°C (75°F) | 82 mm (3.2 inches) | 71% | very high |
| October Weather | 17°C (62°F) | 103 mm (4.1 inches) | 76% | high |
| November Weather | 9°C (49°F) | 77 mm (3.0 inches) | 84% | moderate |
| December Weather | 7°C (45°F) | 97 mm (3.8 inches) | 88% | moderate |