Philadelphia · December
Run in the midday.
Cold: average high 47°F, low 33°F. Layering becomes the workout. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
Avg high / low
47° / 33°F
Humidity
71%
Rain days
13/mo
Wind
11 mph
What December feels like in Philadelphia
Sunrise
08:14
Mid-month average
Sunset
17:38
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
Often the warmest few hours of a cold day. If you can only run once, midday gives you the most temperate window.
Evening
Cold drops back in fast after sunset. Tight window — done before headlamp territory.
What to wear running in Philadelphia in December
The kit for December in Philadelphia: cold-weather layers, gloves, and ear coverage on most mornings, a water-resistant cap or jacket on standby.
December vs the surrounding months
vs November
-8° avg high
+3 rain days
Philadelphia in November →
December
47°F avg high
13 rain days
Best: midday
vs January
+6° avg high
+1 rain days
Philadelphia in January →
Frequently Asked Questions
What is the best time of day to run in Philadelphia in December?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in Philadelphia in December?+
Average high 47°F, average low 33°F.
How does December compare to surrounding months in Philadelphia?+
Compared to November (avg high 55°F), December is cooler. Compared to January (avg high 41°F), December is warmer.
Does it rain often in Philadelphia in December?+
Expect about 13 measurable rain days in December, on average.