Typical Run Score
78
Good
Philadelphia · December
Running in Philadelphia in December
Typical December running conditions in Philadelphia — and a live Run Score so you can see how today compares with the norm.
Avg temperature
39°F
Cold
Avg dew point
29°F
Comfortable
Best window
12–5 PM
Local time
Philadelphia · today vs the December normTemperature · dew point · wind · timing
How December compares in Philadelphia
December ranks 7th of 12 months for running in Philadelphia, with a typical daytime Run Score of 78 (Good). For reference, the best month is November (score 89) and the hardest is July (score 56). The kindest window in December is typically 12–5 PM. Precipitation falls in roughly 15% of hours this month. Use the live tool below to see how today actually compares with the December norm.
Running weather in nearby cities
Same engine, different climate. Check the best time to run in these cities too.
Running in Philadelphia in December: FAQ
Is it good to run in Philadelphia in December?
Generally yes, with sensible timing. The typical daytime Run Score is 78 (Good), with temperatures around 39°F (4°C) and comfortable dew points. The best window is usually 12–5 PM.
How hot is it for running in Philadelphia in December?
Typical temperatures average 39°F (4°C) (Cold) with dew points near 29°F. Dew point — not the thermometer — usually decides how hard the run feels.
What is a good Run Score?
Scores run 0–100. 97+ is Perfect, 80–96 is Great — conditions are actively working in your favour. 65–79 (Good) is solid. 45–64 (Mixed) means at least one factor — usually heat or dew point — is taxing you. Below 45 (Poor), expect a noticeably harder effort or hold back for safety.
Why does dew point matter more than temperature?
Your body cools by evaporating sweat. When the dew point climbs above roughly 60°F, the air is too saturated for sweat to evaporate efficiently, so heat builds up even if the thermometer looks reasonable. That's why a 70°F muggy morning can feel harder than a dry 80°F afternoon.
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