Last updated: June 24, 2025
In Santa Clara, United States, the average temperature for December hovers around 5°C (41°F). Expect chilly nights where temperatures can plummet to a minimum of -17°C (2°F), while daytime highs can reach a comfortable 20°C (69°F). During this month, you'll encounter approximately 30 mm (1.2 in) of precipitation spread over 4 days, accompanied by an average humidity level of 84%.
In December in Santa Clara, the average temperature is 5°C (41°F). The maximum can reach 20°C (69°F) and the minimum can be as low as -17°C (2°F). It's essential to pack layers and prepare for a wide range of weather conditions when traveling during this time.
In Santa Clara in December, the precipitation amount is 30 mm (1.2 in) over the course of 4 days.
In Santa Clara in December humidity is 84%. With an average temperature of 5°C (41°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as you navigate through the cold, heavy air that clings to your skin.
In Santa Clara in December, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Santa Clara.
UV Risk Categories
Weather in Santa Clara varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Santa Clara, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 4°C (39°F) | 33 mm (1.3 inches) | 81% | moderate |
| February Weather | 6°C (42°F) | 41 mm (1.6 inches) | 82% | very high |
| March Weather | 10°C (50°F) | 28 mm (1.1 inches) | 68% | very high |
| April Weather | 15°C (59°F) | 5 mm (0.2 inches) | 55% | extreme |
| May Weather | 19°C (67°F) | 6 mm (0.2 inches) | 45% | extreme |
| June Weather | 25°C (76°F) | 14 mm (0.5 inches) | 37% | extreme |
| July Weather | 24°C (76°F) | 82 mm (3.2 inches) | 43% | extreme |
| August Weather | 23°C (74°F) | 47 mm (1.9 inches) | 53% | extreme |
| September Weather | 20°C (69°F) | 43 mm (1.7 inches) | 66% | extreme |
| October Weather | 15°C (60°F) | 24 mm (1.0 inches) | 72% | very high |
| November Weather | 10°C (50°F) | 31 mm (1.2 inches) | 81% | high |
| December Weather | 5°C (41°F) | 30 mm (1.2 inches) | 84% | moderate |