Last updated: June 24, 2025
In December, the average temperature in San Tan Valley, United States hovers around 12°C (55°F). However, temperatures can fluctuate, with a minimum of -1°C (31°F) and a peak at 28°C (82°F). Expect about 30 mm (1.2 in) of precipitation over approximately 4 days, contributing to a rather high average humidity of 82%.
In December in San Tan Valley, the average temperature is 12°C (55°F). The maximum can reach 28°C (82°F) and the minimum can be as low as -1°C (31°F). It's a great time to visit San Tan Valley for those who enjoy mild weather with a touch of warmth and the possibility of cooler evenings.
In San Tan Valley in December, the precipitation amount is 30 mm (1.2 in) over the course of 4 days.
In San Tan Valley in December, humidity is 82%. With an average temperature of 12°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even a simple walk feel laborious and sticky, which can be quite exhausting for traveling.
In San Tan Valley in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in San Tan Valley for better planning.
UV Risk Categories
Weather in San Tan Valley varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in San Tan Valley, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (54°F) | 33 mm (1.3 inches) | 76% | moderate |
| February Weather | 13°C (56°F) | 42 mm (1.7 inches) | 79% | high |
| March Weather | 17°C (64°F) | 25 mm (1.0 inches) | 67% | very high |
| April Weather | 23°C (73°F) | 2 mm (0.1 inches) | 55% | extreme |
| May Weather | 27°C (80°F) | 3 mm (0.1 inches) | 40% | extreme |
| June Weather | 33°C (91°F) | 3 mm (0.1 inches) | 33% | extreme |
| July Weather | 34°C (93°F) | 45 mm (1.8 inches) | 34% | extreme |
| August Weather | 33°C (92°F) | 34 mm (1.4 inches) | 48% | extreme |
| September Weather | 30°C (87°F) | 29 mm (1.2 inches) | 64% | very high |
| October Weather | 24°C (75°F) | 20 mm (0.8 inches) | 67% | very high |
| November Weather | 18°C (65°F) | 21 mm (0.8 inches) | 77% | moderate |
| December Weather | 12°C (55°F) | 30 mm (1.2 inches) | 82% | moderate |