Counties in Maryland by average annual temperature

Somerset County had the highest average annual temperature of 24 counties in 2018, at 58.9 °F. Garrett County had the lowest, at 48.8 °F. The median was 57 °F and the figure for Maryland was 55.9 °F. Source: NOAA National Centers for Environmental Information.

Highest58.9Somerset County

Lowest48.8Garrett County

Median5724 counties

Maryland55.9History

Map of counties, 2018

Under 55
55 to 56
56 to 57
57 to 58
58 and over

°F, 2018. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 2018

°F. Source: NOAA NCEI, NOAA Climate at a Glance, January to December average temperature, counties. Retrieved 2026-10-12.

Full ranking

Rank	Counties	2018 °F	Change on 2017
1	Somerset County	58.9	-0.8%
2	Worcester County	58.5	-0.7%
3	Dorchester County	58.4	-0.7%
3	Wicomico County	58.4	-0.7%
5	St. Mary's County	58.2	-0.9%
6	Talbot County	58.1	-0.7%
7	Charles County	58	-1.7%
8	Calvert County	57.9	-0.7%
9	Anne Arundel County	57.6	-1.4%
10	Caroline County	57.5	-0.7%
11	Baltimore city	57.2	-1.4%
11	Prince George's County	57.2	-1.4%
13	Queen Anne's County	56.8	-1.4%
14	Kent County	56.3	-1.6%
15	Montgomery County	55.5	-1.6%
16	Cecil County	55.1	-1.4%
16	Howard County	55.1	-1.6%
18	Baltimore County	55	-1.6%
19	Harford County	54.7	-1.3%
20	Frederick County	54.3	-1.8%
21	Washington County	54	-1.8%
22	Carroll County	53.8	-1.6%
23	Allegany County	52.7	-1.9%
24	Garrett County	48.8	-2%

Other periods

About this ranking

Mean air temperature from January to December, in degrees Fahrenheit: the average of the 12 monthly mean temperatures. NOAA computes it from its climate divisional dataset (nClimDiv): station readings interpolated onto a 5 km grid and averaged over the area.

Values are area averages, so a county with mountains and valleys has one value for very different local climates. NOAA revises the last two years every month.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

NOAA National Centers for Environmental Information. (2026). NOAA Climate at a Glance, January to December average temperature, counties (Counties in Maryland by average annual temperature, 2018) [Data set]. Retrieved October 12, 2026, from https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping

MLA 9

NOAA Climate at a Glance, January to December average temperature, counties, Counties in Maryland by average annual temperature, 2018. NOAA National Centers for Environmental Information, 6 Oct. 2026, https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Invokely, https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018. Accessed 12 Oct. 2026.

Chicago (author-date)

NOAA National Centers for Environmental Information. 2026. NOAA Climate at a Glance, January to December average temperature, counties. Counties in Maryland by average annual temperature, 2018. Dataset. Accessed October 12, 2026. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Also distributed by Invokely, https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018.

Harvard

NOAA National Centers for Environmental Information (2026) NOAA Climate at a Glance, January to December average temperature, counties, Counties in Maryland by average annual temperature, 2018 [Dataset]. Available at: https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping, via Invokely: https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018 (Accessed: 12 October 2026).

BibTeX

@misc{noaa_counties_in_maryland_by_2018,
  author = {{NOAA National Centers for Environmental Information}},
  title = {{NOAA Climate at a Glance, January to December average temperature, counties: Counties in Maryland by average annual temperature, 2018}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018. Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.},
}

RIS

TY  - DATA
AU  - NOAA National Centers for Environmental Information
TI  - NOAA Climate at a Glance, January to December average temperature, counties: Counties in Maryland by average annual temperature, 2018
PY  - 2026
DA  - 2026/10/06
PB  - NOAA National Centers for Environmental Information
DB  - Invokely
UR  - https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping
L2  - https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/average-annual-temperature/maryland-counties?period=2018.
N1  - Publisher attribution: NOAA National Centers for Environmental Information, Climate at a Glance. NOAA Climate at a Glance, January to December average temperature, counties. From the NOAA Monthly U.S. Climate Divisional Database (nClimDiv), doi:10.7289/V5M32STR. https://www.ncei.noaa.gov/access/monitoring/climate-at-a-glance/county/mapping. Retrieved 2026-10-12.
ER  -

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Rank Counties in Maryland by average annual temperature using official data, and cite the source.

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Questions

Which county has the highest average annual temperature?

Somerset County, with 58.9 °F in 2018, according to NOAA National Centers for Environmental Information.

Which county has the lowest average annual temperature?

Garrett County, with 48.8 °F in 2018.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: NOAA National Centers for Environmental Information, NOAA Climate at a Glance, January to December average temperature, counties. Retrieved 2026-10-12.