Typical Run Score
73
Good
Boston · December
Running in Boston in December
Typical December running conditions in Boston — and a live Run Score so you can see how today compares with the norm.
Avg temperature
36°F
Cold
Avg dew point
27°F
Comfortable
Best window
11 AM–6 PM
Local time
Boston · today vs the December normTemperature · dew point · wind · timing
How December compares in Boston
December ranks 8th of 12 months for running in Boston, with a typical daytime Run Score of 73 (Good). For reference, the best month is October (score 91) and the hardest is July (score 63). The kindest window in December is typically 11 AM–6 PM. Precipitation falls in roughly 16% 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 Boston in December: FAQ
Is it good to run in Boston in December?
Generally yes, with sensible timing. The typical daytime Run Score is 73 (Good), with temperatures around 36°F (2°C) and comfortable dew points. The best window is usually 11 AM–6 PM.
How hot is it for running in Boston in December?
Typical temperatures average 36°F (2°C) (Cold) with dew points near 27°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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