Carroll County, Maryland Carroll County lies in a region midway between the vigorous climate of the North and the mild climate of the South. Since the County is located in the middle latitudes where the general atmospheric flow is from west to east across North America, it has a continental type of climate with four well defined seasons. Temperature and precipitation data in the following table is provided by the Maryland State Office of Climatology.
Thunderstorms occur on an average of thirty days per year.
Prevailing surface winds are from west northwest to northwest except during the months of May through September when they become more southerly. The average annual wind speed is about nine miles per hour. Damaging or dangerous storms, such as tornadoes, hurricanes, and blizzards, are rare.