Williston, MD is located in a humid subtropical climate, characterized by hot and humid summers and mild winters. Summers tend to be muggy, with high temperatures averaging around 88°F during the hottest months of the year. Winters are usually mild, with average temperatures ranging from 44-59°F. Precipitation is abundant throughout the year, with an average of about 48 inches annually. The area also experiences snowfall in the wintertime, although it can range from year to year.
Williston, Maryland gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Williston averages 12 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 206 sunny days per year in Williston. The US average is 205 sunny days.
Williston gets some kind of precipitation, on average, 107 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.
Weather Highlights
Summer High: the July high is around 87 degrees
Winter Low: the January low is 26
Rain: averages 45 inches of rain a year
Snow: averages 12 inches of snow a year