Last updated: June 24, 2025
In December, the average temperature in Phoenix, United States hovers around 0°C (33°F). Expect a chilly range, with minimum temperatures dropping to -16°C (3°F) and reaching up to 17°C (63°F). During this month, precipitation amounts to approximately 114 mm (4.5 in), spread over 19 days, contributing to an average humidity of 86%. Stay warm and prepared for the wet conditions!
In December in Phoenix, the average temperature is 0°C (33°F). Maximums can reach 17°C (63°F), while minimums can drop as low as -16°C (3°F). Pack accordingly for a trip to Phoenix this month, as you'll experience a mix of chilly and mild weather.
In Phoenix in December, the precipitation amount is 114 mm (4.5 in), occurring over the course of 19 days.
In Phoenix in December humidity is 86%. With an average temperature of 0°C (33°F), this humidity feels like a damp chill that permeates your clothes, making traveling uncomfortable and necessitating warm, layered clothing to stay dry and cozy.
In Phoenix in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Phoenix, you can visit Hourly UV Index in Phoenix.
UV Risk Categories
Weather in Phoenix varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Phoenix, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -3°C (27°F) | 97 mm (3.8 inches) | 90% | moderate |
| February Weather | -2°C (29°F) | 98 mm (3.9 inches) | 90% | moderate |
| March Weather | 1°C (35°F) | 91 mm (3.6 inches) | 87% | high |
| April Weather | 7°C (46°F) | 122 mm (4.8 inches) | 88% | very high |
| May Weather | 14°C (57°F) | 119 mm (4.7 inches) | 82% | very high |
| June Weather | 19°C (67°F) | 100 mm (3.9 inches) | 79% | very high |
| July Weather | 23°C (73°F) | 175 mm (6.9 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 124 mm (4.9 inches) | 76% | very high |
| September Weather | 18°C (65°F) | 87 mm (3.4 inches) | 78% | high |
| October Weather | 13°C (55°F) | 170 mm (6.7 inches) | 84% | high |
| November Weather | 5°C (41°F) | 115 mm (4.5 inches) | 89% | moderate |
| December Weather | 0°C (33°F) | 114 mm (4.5 inches) | 86% | low |