Maryland Climate Bulletin

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In case you haven't seen this from the State Climatologist ...

 

"Good afternoon,

 

We now share the Maryland Climate Bulletin for June 2025.

 

You can access the Bulletin from the following link:

 

https://mdsco.umd.edu/Bulletin/bulletin_mdsco_current.pdf

 

Points to highlight are:

 

1) Statewide averages indicate that June 2025 was warmer and drier than normal (i.e., 1991-2020 averages). Warmer-than-normal conditions persisted for a fifth consecutive month, while precipitation was back to below-normal conditions after a wetter-than-normal May. 

 

2) The mean temperature was warmer than normal in the entire state, particularly over Saint Mary’s and southern Calvert counties (3.9 to 4.2°F), parts of Charles, Calvert, Talbot, Dorchester, Wicomico, Somerset, and Worcester counties (3.3 to 3.9°F), and southwestern Garrett County (3.0 to 3.3°F). Precipitation was below normal in more than half of the state, largely over the coastal counties around the Chesapeake Bay, and particularly over Caroline, Talbot, Dorchester, and Wicomico counties (1.2 to 1.8 inches deficit). These counties received between 60 to 70% of their climatological precipitation for the month. Precipitation was above normal in several counties, especially in Garrett County (1.2−2.1 inches) and northern Carroll and Baltimore counties (0.9−1.5 inches), which received between 20% and 40% more than their climatological precipitation.

 

3) Drought conditions kept improving by the end of June, as approximately 69% of the state was now drought-free, an increase of 18% with respect to the start of June. The extent of Moderate Drought conditions was reduced to around 12%, impacting only Baltimore and Harford counties. The extent of Abnormally Dry conditions was reduced to 19%, primarily affecting the central and eastern Piedmont, as well as some coastal counties on both sides of the Bay, reflecting the transition of these areas toward improved conditions. Streams and rivers experienced much above-normal streamflow in western Maryland and normal streamflow in the Piedmont and on both sides of the Bay. Still, some streams and rivers on the Piedmont and northern Eastern Shore had below-normal stream flow.

 

4) Statewide maximum and minimum daily temperatures from January 1 to June 30, 2025, indicated that the number of days with extreme temperatures has been larger than normal, and so has the number of warm spells. Most of these extreme temperatures occurred in June. For instance, there have been six more warm nights (minimum temperature larger than 68°F) than normal (10 vs. 4), and one more warm night spell than normal (2 vs. 1) by the end of June; the mean temperature of all the warm nights was 71.5°F, while the maximum was 75.4°F, which occurred on June 24. 

 

5) Statewide daily total precipitation from January 1 to June 30 showed 1 less day with extreme precipitation (at least 0.64 inches; the 95th percentile in 1951−2000) than normal (8 vs. 9), with none occurring in June. The number of dry spells (two or more consecutive days with daily precipitation of no more than 0.04 inches) from January 1 to June 30 was also fewer than normal by 3 spells (22 vs. 25). 

 

6) The cumulative calendar year (January 1 to June 30, 2025) modified growing degree days (base 86/50°F) reached around 1684°FDD by the end of June and have been greater than normal since the second week of March, with a departure above normal of 192°FDD by the end of June. The modified growing degree days in June were very similar to those in June of last year.

 

7)  Statewide mean, maximum, and minimum temperatures in June 2025 (74.8, 84.9, 64.7°F) were above their long-term mean (1895-2024); the mean and minimum temperatures were among the 5% of their highest values, while the maximum temperature was within the 10% of its highest values on record. The mean, maximum, and minimum temperatures were still far from their historical record highs of 76.6°F in 1943, 87.7°F in 1925, and 65.9°F in 1943, respectively. Statewide precipitation in June (3.92 inches) was close to the long-term mean and far from the record low of 0.93 inches in 1988.

 

8) Statewide mean, maximum, and minimum temperatures indicated that June 2025 was the fourth, tenth, and third warmest June since 1895, respectively. Ten of the counties experienced mean temperatures among the five warmest on record, and five of these counties had maximum temperatures among the five warmest Junes. Twenty-two counties recorded minimum temperatures among the four warmest on record; nineteen of them reached their third-warmest June, while Washington County recorded its second warmest.

 

9) Statewide precipitation showed that June 2025 was the seventy-second driest (or sixty wettest) June since 1895.

 

Please take a look at the bulletin for more details, including information on century-long trends. 

 

The bulletin is issued once per month and shows the state's recent monthly surface temperature and precipitation conditions in a simple format, helping Marylanders better understand regional climate variations.

Please help disseminate this bulletin.

Thanks,

 

Alfredo" 

 

-- 

............................................. 
Alfredo Ruiz-Barradas, PhD 

Associate Research Professor

Maryland State Climatologist
Department of Atmospheric and Oceanic Science 

3437 Atlantic Building, 4254 Stadium Dr.
University of Maryland 
College Park, MD 20742-2425, USA 
Email: [email protected]