This post provides information about what kind of weather you can expect in Prague throughout December. Prague this month is cold, cloudy, but somewhat dry.
Daytime high temperatures in Prague early in December tend to be around 4 C (about 39 F) but fall to about 2 C (about 36 F) near the end of the month.
A few of the warmer days, early in December, can reach up to near 10 C (50 F). The record high temperature during December is 19 C (66.2 F).
Late night and early morning low temperatures are quite cold, averaging near 0 C (32 F) early in the month falling to about -3 C (27 F) near the end of the month.
A few of the colder mornings, especially late in the month, can dip down to -10 C (14 F). You should expect about 23 days this month with minimum temperatures dipping down to 0 C or below.
The record low temperature in Prague during December is a bone chilling -20 C (-4 F).
Clouds and Rain
December will see about 11-12 days with clear or at least partly sunny skies. Precipitation during December is light, totaling only about 25 mm (about 1 inch) and can often fall in the form of snow.
You should expect about 5-6 days with at least 1 mm (0.04 inches) of precipitation. Snow varies greatly from year to year, however, on average, about 6-7 days will have some snow on the ground.
Amount of Daylight
Daylight hours decrease from about 8.4 hours on December 1st to just over 8 hours on the 21st before starting to increase slowly again.
The wind tends to be mostly gentle (12-19 kph/8-12 mph) but will occasionally be moderate (20-28 kph/13-18mph).