St. Mary's County, MD has a humid subtropical climate with hot and humid summers and mild winters. The average temperature in the summer is around 80°F (27°C) and in the winter is near 40°F (4°C). Rainfall is abundant throughout the year, with an average of 46 inches per year. There are four distinct seasons, with spring and fall being particularly enjoyable for outdoor activities. The county also benefits from cool ocean breezes during the summer months which help to moderate temperatures.
St. Mary's County, Maryland gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.
St. Mary's County averages 14 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 203 sunny days per year in St. Mary's County. The US average is 205 sunny days.
St. Mary's County 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.
Weather Highlights
Summer High: the July high is around 88 degrees
Winter Low: the January low is 28
Rain: averages 45 inches of rain a year
Snow: averages 14 inches of snow a year