Gaithersburg (zip 20878), Maryland gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Gaithersburg (zip 20878) averages 19 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 197 sunny days per year in Gaithersburg (zip 20878). The US average is 205 sunny days.
Gaithersburg (zip 20878) gets some kind of precipitation, on average, 114 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Summer High: the July high is around 85 degrees
Winter Low: the January low is 25
Rain: averages 42 inches of rain a year
Snow: averages 19 inches of snow a year
BESTPLACES COMFORT INDEX
The annual BestPlaces Comfort Index for the 20878 zip code is 7.3 (10=best), which means it is more comfortable than most places in Maryland.
8.4 / 5.7
Summer / Winter
September, June and May are the most pleasant months in the 20878 zip code, while January and February are the least comfortable months.