Last updated: June 24, 2025
In December, the average temperature in Sierra Vista, United States hovers around 9°C (48°F), offering a chilly but invigorating atmosphere. Expect temperatures to fluctuate between a brisk -6°C (22°F) at night and a balmy 23°C (74°F) during the day. With an average precipitation amount of 22 mm (0.9 in) spread across about 4 days, it's wise to keep an umbrella handy. The air is quite humid, with an average of 81% humidity, adding a touch of dampness to the cool air.
In December in Sierra Vista, the average temperature is 9°C (48°F). Maximum temperatures can reach 23°C (74°F), while minimums can drop as low as -6°C (22°F). It's essential to pack layers to prepare for the varying temperatures during your travels.
In Sierra Vista in December, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.
In Sierra Vista in December, humidity is 81%. With an average temperature of 9°C (48°F), this humidity feels like a chilly, damp embrace that can make outdoor activities less enjoyable and may require extra layers to stay comfortable while traveling.
In Sierra Vista 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 Sierra Vista.
UV Risk Categories
Weather in Sierra Vista varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Sierra Vista, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 8°C (47°F) | 20 mm (0.8 inches) | 74% | moderate |
| February Weather | 9°C (49°F) | 25 mm (1.0 inches) | 71% | high |
| March Weather | 13°C (55°F) | 17 mm (0.7 inches) | 60% | very high |
| April Weather | 17°C (64°F) | 4 mm (0.2 inches) | 43% | extreme |
| May Weather | 21°C (71°F) | 3 mm (0.1 inches) | 32% | extreme |
| June Weather | 27°C (81°F) | 8 mm (0.3 inches) | 28% | extreme |
| July Weather | 26°C (79°F) | 89 mm (3.5 inches) | 38% | extreme |
| August Weather | 25°C (78°F) | 71 mm (2.8 inches) | 60% | extreme |
| September Weather | 23°C (74°F) | 36 mm (1.4 inches) | 72% | extreme |
| October Weather | 18°C (65°F) | 18 mm (0.7 inches) | 66% | very high |
| November Weather | 14°C (57°F) | 27 mm (1.1 inches) | 74% | high |
| December Weather | 9°C (48°F) | 22 mm (0.9 inches) | 81% | moderate |