Phoenix · December
Run in the morning.
Cool month: average high 66°F, low 43°F. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
66° / 43°F
Humidity
53%
Rain days
6/mo
Wind
8 mph
What December feels like in Phoenix
Sunrise
07:24
Mid-month average
Sunset
17:23
Mid-month average
Time-of-day breakdown
Morning
Steady cool air, low wind, and good light. The standard runner window in most months.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in Phoenix in December
The kit for December in Phoenix: a long-sleeve or light jacket for the first mile.
December vs the surrounding months
vs November
-11° avg high
+4 rain days
Phoenix in November →
December
66°F avg high
6 rain days
Best: morning
vs January
0° avg high
+1 rain days
Phoenix in January →
Frequently Asked Questions
What is the best time of day to run in Phoenix in December?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Phoenix in December?+
Average high 66°F, average low 43°F.
How does December compare to surrounding months in Phoenix?+
Compared to November (avg high 77°F), December is cooler. Compared to January (avg high 66°F), December is cooler.
Does it rain often in Phoenix in December?+
Expect about 6 measurable rain days in December, on average.