Last updated: June 24, 2025
In December, the average temperature in Mountain View, United States hovers around 22°C (72°F), making for a pleasant climate. Expect temperatures to range from a cool 15°C (60°F) to a warm 27°C (82°F). However, be prepared for occasional rain, as the area receives about 180 mm (7.1 in) of precipitation over approximately 22 days. With an average humidity of 81%, you might want to stay hydrated and enjoy the refreshing atmosphere!
In December in Mountain View, the average temperature is 22°C (72°F). Maximum temperatures can reach 27°C (82°F), while minimums can drop as low as 15°C (60°F). This makes it an ideal time for travelers seeking comfortable and enjoyable weather conditions.
In Mountain View in December, the total precipitation amount is 180 mm (7.1 in), occurring over the course of 22 days.
In Mountain View in December, humidity is 81%. With an average temperature of 22°C (72°F), this humidity feels like a warm, enveloping blanket, making traveling feel both lush and a bit stifling, as the air clings to your skin and every step is accompanied by a gentle sheen of moisture.
In Mountain View in December, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Mountain View.
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 | 22°C (71°F) | 118 mm (4.7 inches) | 79% | very high |
| February Weather | 21°C (71°F) | 209 mm (8.2 inches) | 79% | extreme |
| March Weather | 22°C (71°F) | 154 mm (6.0 inches) | 77% | extreme |
| April Weather | 22°C (73°F) | 117 mm (4.6 inches) | 80% | extreme |
| May Weather | 23°C (74°F) | 127 mm (5.0 inches) | 80% | extreme |
| June Weather | 24°C (75°F) | 90 mm (3.5 inches) | 82% | extreme |
| July Weather | 24°C (76°F) | 97 mm (3.8 inches) | 83% | extreme |
| August Weather | 25°C (77°F) | 188 mm (7.4 inches) | 84% | extreme |
| September Weather | 25°C (77°F) | 93 mm (3.7 inches) | 82% | extreme |
| October Weather | 24°C (76°F) | 137 mm (5.4 inches) | 83% | extreme |
| November Weather | 23°C (74°F) | 108 mm (4.2 inches) | 83% | very high |
| December Weather | 22°C (72°F) | 180 mm (7.1 inches) | 81% | very high |