St. Mary s County, MD Climate

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

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Mary's County is 7.4 (10=best), which means it is one of the most pleasant places in Maryland.

7.6 Summer - 6.2 Winter

September, May and October are the most pleasant months in St. Mary's County, while January and February are the least comfortable months.

Climate	St. Mary's, Maryland	United States
	45.4 in.	38.1 in.
	14.2 in.	27.8 in.
	113.5 days	106.2 days
	203 days	205 days
	87.8°	85.8°
	27.7°	21.7°
	7.4	7
	4	4.3
	68 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for St. Mary's County with an average high temperature of 87.8°, which ranks it as warmer than most places in Maryland. In St. Mary's County, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Mary's County are September, May and June.

In St. Mary's County, there are 25.6 days annually when the high temperature is over 90°, which is about average compared to other places in Maryland.

January has the coldest nighttime temperatures for St. Mary's County with an average of 27.7°. This is warmer than most places in Maryland.

In St. Mary's County, there are 73.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Maryland.

In St. Mary's County, there are 0.1 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Maryland.

The humidity can be uncomfortably heavy or close in St. Mary's County during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in St. Mary's County.

July is the wettest month in St. Mary's County with 4.5 inches of rain, and the driest month is February with 2.9 inches. The wettest season is Autumn with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 45.4 inches in St. Mary's County means that it is wetter than most places in Maryland.

May is the rainiest month in St. Mary's County with 10.9 days of rain, and October is the driest month with only 7.8 rainy days. There are 113.5 rainy days annually in St. Mary's County, which is about average compared to other places in Maryland. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 14.2 inches in St. Mary's County means that it is less snowy than most places in Maryland. February is the snowiest month in St. Mary's County with 5.1 inches of snow, and 4 months of the year have significant snowfall.

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