Bristol · December
Run in the midday.
Cold: average high 48°F, low 40°F. Layering becomes the workout. Humidity averages 89% — the limiting factor on most runs. Expect 18 rain days — plan around the radar. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
Avg high / low
48° / 40°F
Humidity
89%
Rain days
18/mo
Wind
16 mph
What December feels like in Bristol
Sunrise
09:08
Mid-month average
Sunset
17:04
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 Bristol in December
The kit for December in Bristol: a long-sleeve or light jacket for the first mile, a wind-blocking layer for exposed routes, a water-resistant cap or jacket on standby.
December vs the surrounding months
vs November
-3° avg high
0 rain days
Bristol in November →
December
48°F avg high
18 rain days
Best: midday
vs January
+2° avg high
0 rain days
Bristol in January →
Frequently Asked Questions
What is the best time of day to run in Bristol in December?+
Midday. Cold mornings warm into runnable midday hours — the windows around noon catch the warmest temperatures.
What's the average temperature in Bristol in December?+
Average high 48°F, average low 40°F.
How does December compare to surrounding months in Bristol?+
Compared to November (avg high 51°F), December is cooler. Compared to January (avg high 46°F), December is warmer.
Does it rain often in Bristol in December?+
Expect about 18 measurable rain days in December, on average.