Phoenix Weather in December
United States · Hot Desert climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
December in Phoenix sees average temperatures ranging from a low of 6.8°C (44.2°F) to a high of 19.6°C (67.3°F), with a mean of 13.0°C (55.4°F). Compared to the annual average of 23.8°C (74.8°F), this month is 10.8°C cooler than the yearly norm. Precipitation averages 35.2mm, making it approximately 11.0mm wetter than the monthly average of 24.0mm. The city receives an average of 8.3 hours of sunshine per day during December, with relative humidity averaging 47.5%. Wind speeds reach an average maximum of 12.5 km/h. For travelers, this month offers a temperature experience in Phoenix, with wetter-than-average conditions compared to the rest of the year.
Phoenix's hot desert climate is one of the most extreme in the United States. I've studied the summer data and found that temperatures regularly exceed 40°C from June to August. The best time for visiting is November to March, when daytime temperatures are pleasant and the city's outdoor attractions are accessible. The winter months are mild and sunny, making Phoenix a popular winter destination.
December vs Adjacent Months
| Metric | November | December | January |
|---|---|---|---|
| Mean Temp | 17.6°C (63.7°F) | 13.0°C (55.4°F) | 11.4°C (52.5°F) |
| Rainfall | 6.1mm | 35.2mm | 31.0mm |
| Sunshine | 9.4 hrs | 8.3 hrs | 8.5 hrs |
| Humidity | 32.4% | 47.5% | 54.5% |
| Wind | 14.7 km/h | 12.5 km/h | 15.1 km/h |
| Rainy Days | 2.8 | 5.0 | 6.2 |
Seasonal Context
December falls in Winter in the Northern Hemisphere. Winter is the coolest season with the shortest daylight hours. For travelers visiting Phoenix in December, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Phoenix in December?
The average temperature in Phoenix during December ranges from 6.8°C (44.2°F) to 19.6°C (67.3°F), with a mean of 13.0°C (55.4°F).
How much does it rain in Phoenix in December?
Phoenix receives an average of 35.2mm of precipitation in December, spread across approximately 5.0 rainy days.
What should I pack for Phoenix in December?
Based on December weather data, pack warm layers, a medium jacket, and waterproof outerwear.
Is December a good time to visit Phoenix?
December is a cooler month, suitable for travelers who prefer mild weather and fewer crowds. Pack warm layers and enjoy indoor attractions.
Other Months for Phoenix
Cities with Similar December Climate (Hot Desert)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 33.45°, -112.07°. Timezone: America/Phoenix. Last updated: 2026-07-30.