Maryland Annual Temperatures and Records
Avg High Temp
Avg Low Temp
Avg Annual Temp
|Avg # days > 90F||Avg # days < 32F||Record High Temp||Record Low Temp|
|Baltimore||65.3||45.5||55.4||31||95||105 / 1983||-7 / 1963|
|Hagerstown||64.2||43.3||53.7||25||107||104 / 1954||-17 / 1977|
Maryland's Temperature Records
- Hottest temperature ever recorded: 109 F, Cumberland / Frederick, west-central Maryland, 7/10/1936
- Coldest temperature ever recorded: -40 F, Oakland, western Maryland, 1/13/1912
- Hottest location ranked by highest average annual temperature: Solomons, southern Maryland, 58.0 F
- Coldest location ranked by lowest average annual temperature: Frostburg, western Maryland, 47.9 F
- During the summer of 2010, Baltimore set a new record for number of days with the temperature
equal or greater than 90 degrees with 54 days.
The mean annual temperature in Maryland ranges from about 48 in the Garrett County area to 58° F in the lower Chesapeake Bay area. The winter climate on the Piedmont and Coastal Plain sections of Maryland is intermediate between the cold of the northeast and the mild weather of the South. Extremely cold air masses from the interior of the continent are moderated somewhat by passage over the Appalachian Mountains and in some instances by a short trajectory over the nearby ocean and bays. Weather on the Allegheny Plateau is frequently 10 to 15 degrees colder than it is in eastern portions of the State and, at times, extremely low temperatures occur in winter.
Summer is characterized by considerable warm weather including at least several hot, humid periods; however, nights are usually quite comfortable, with some exceptions. The average length of the freeze-free season, based on a minimum temperature higher than 32° F, ranges from more than 230 days in southern and central portions to fewer than 130 days on the Allegheny Plateau in Garrett County.
The extreme temperatures in Maryland range from -40 to 109° F. Such occurrences are extremely unusual and might happen only once in 75 or 100 years, on the average. Extremely high temperatures in Maryland are generally associated with dry weather and sometimes with the occurrence of droughts that occasionally reach serious proportions in some parts of the State.
On the average, temperatures of 90° F or higher occur on 15 to 25 days per year along the Atlantic Coast and along the shores of the Chesapeake Bay. Elsewhere, the range is from a maximum of 30 to 40 days in the central portions to a minimum of two to 10 days on the Allegheny Plateau. There is a tendency for 35 or more days with 90° F or higher to occur in the lower elevations around Cumberland due to the warming of air masses flowing down slope from the Allegheny Plateau.
averages and extremes, Baltimore
climate extremes/averages, precipitation and temperature data for all U.S.
Top 10 U.S. climate extremes
Data source: National Climatic Data Center