Jacksonville · December
Run in the morning.
Cool month: average high 68°F, low 53°F. Humidity averages 81% — the limiting factor on most runs. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
68° / 53°F
Humidity
81%
Rain days
12/mo
Wind
11 mph
What December feels like in Jacksonville
Sunrise
08:15
Mid-month average
Sunset
18:29
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
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 Jacksonville in December
The kit for December in Jacksonville: shorts and a short-sleeve are the standard kit.
December vs the surrounding months
vs November
-4° avg high
0 rain days
Jacksonville in November →
December
68°F avg high
12 rain days
Best: morning
vs January
+4° avg high
+1 rain days
Jacksonville in January →
Frequently Asked Questions
What is the best time of day to run in Jacksonville in December?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Jacksonville in December?+
Average high 68°F, average low 53°F.
How does December compare to surrounding months in Jacksonville?+
Compared to November (avg high 72°F), December is cooler. Compared to January (avg high 64°F), December is warmer.
Does it rain often in Jacksonville in December?+
Expect about 12 measurable rain days in December, on average.