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Category: Historical Data

FINALLY! Measurable Snow in Baltimore

FINALLY! Measurable Snow in Baltimore

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UPDATE: Early in the morning on Feb. 1, 2023, snow began falling in the Baltimore/DC. area, providing the first measurable snowfall for many. As of 7:00 AM, Baltimore-Washington International Thurgood Marshall Airport (BWI) had reported 0.2” while DC’s Reagan National Airport (DCA) and Washington-Dulles International Airport (IAD) both reported 0.4”. This was the 3rd latest first-measurable snowfall for Baltimore, with a snow archive going back to 1883 (when including the previous downtown locations). Now we wait for the first snowfall…

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Baltimore’s Calendar-Day Precipitation Record – July 9th

Baltimore’s Calendar-Day Precipitation Record – July 9th

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Baltimore’s Daily Precipitation record was broken on July 9, 2022 when 1.36” was recorded, superseding the previous record of 0.99” in 1970. Though these amounts are not unusual for July, what is unusual is that this was the last of the meteorological summer months of June, July, and August to not have a calendar day exceeding 1.00” of rain. Other months having each day with extremes of >1.00”: January,  March, September, and December). Baltimore’s official precipitation archive goes back to…

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Baltimore’s Late-Season Freezing Temperature

Baltimore’s Late-Season Freezing Temperature

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On April 29, 2022, the temperature dropped to 32°F. at Baltimore-Washington International Thurgood Marshall Airport (BWI), breaking the daily record of 33° from way back in 1874. This also established the 3rd latest freezing temperature ever recorded for Baltimore. The only two later-in-the-season times it’s reached freezing were on April 30, 1961 and May 11, 1966 when both dates also recorded 32°F.   Baltimore’s long-term temperature archive covers both the previous downtown locations (7/1872 to 7/1950) and BWI (8/1950-Present) and…

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Washington, DC Area Sets Top-10 April Rainfalls in 2020

Washington, DC Area Sets Top-10 April Rainfalls in 2020

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The final day of April catapulted both Dulles Airport and the longer-term Washington, DC into Top-10 total rainfalls for the month in their historical records. On April 30, 2020, the current official Washington, DC station at Reagan National Airport (located in Virginia, across the Potomac River from DC), started the day with a monthly total of 5.20″, requiring another 0.77″ to move into a tie for 10th place with the 5.97″ that fell in April 1952. The final total of 1.10″ on…

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Washington/Baltimore’s Paltry Number of Days ≤32°

Washington/Baltimore’s Paltry Number of Days ≤32°

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As the DC/Baltimore area is just about past its normal period of freezing weather in the Spring, it has been one of the milder seasons regarding freezing temperatures. Historically, most locations outside of the downtown areas have had freezing temperatures into May but, as the extended forecast is currently not showing any cold weather into early May, this current season, which runs July 1, 2019 – June 30, 2020, has been a record to near-record mild period. The airport in…

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RECORD RAINFALL FOR THE DC/BALTIMORE METRO ON 4/13/2020

RECORD RAINFALL FOR THE DC/BALTIMORE METRO ON 4/13/2020

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The storms that swept through the area on Monday, April 13, 2020 brought a National Weather Service-confirmed EF-1 Tornado to Frizzellburg (between Westminster and Taneytown in north-central Maryland), and very strong winds and subsequent damage (gusts to greater than 70 MPH!) to many parts of the DC/Baltimore Metro Area, and also record daily rainfall. Both Washington and Dulles basically doubled their previous record amounts (Washington’s official historical record dating back 150 years!). Here are the area’s three major airport record precipitation…

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Baltimore’s Weather Review of 2018

Baltimore’s Weather Review of 2018

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Precipitation was the name of the game in 2018. Baltimore set many records, including the greatest all-time calendar-year total with 71.82″ at Baltimore/Washington International Thurgood Marshall Airport (BWI). This is most impressive considering official precipitation records began in downtown Baltimore back in 1871 (official records were shifted to the airport in August 1950) so this is the highest annual total in the last 147 years! If we were to include the pre-National Weather Service data recorded from 1817-1870 (from various…

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MARYLAND STATE ANNUAL PRECIPITATION RECORD – 2018 FINAL REPORT

MARYLAND STATE ANNUAL PRECIPITATION RECORD – 2018 FINAL REPORT

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  The final 2018 data tables were updated on 5/22/2019 for Maryland’s all-time record precipitation year. With the release of the “Maryland and Delaware Climatological Data Annual Summary” by the National Centers for Environmental Information (NCEI), in conjunction with data from the Applied Climate Information System database (ACIS) from the NOAA Regional Climate Centers, these final numbers could finally be verified. Not only did Maryland set its all-time annual total (the 84.56″ at Catonsville was investigated and verifed by the…

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BALTIMORE BREAKS ITS ANNUAL PRECIPITATION RECORD

BALTIMORE BREAKS ITS ANNUAL PRECIPITATION RECORD

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November 15, 2018 was the day that Baltimore set its long-term record for greatest total precipitation in a calendar year. With 1.33″ of liquid precipitation being recorded by midnight, the 2018 total has now reached 63.01″, breaking the previous record of 62.66″ set in 2003. This data includes the official downtown locations from Jan. 1871 to July 1950, then Baltimore-Washington (nee Friendship) International Airport thereafter. With 6 weeks to go, any new precipitation will be gravy (not literally, and probably…

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Record-Wet 2018 Already for Several Maryland Locations

Record-Wet 2018 Already for Several Maryland Locations

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It has certainly been a wet year in the Free State, with several locations already exceeding their record-annual totals, mainly on the western side of the Chesapeake Bay. Some of these stations even have long-term periods-of-record so it’s not for lack of data that has allowed for the all-time totals. Here are the current National Weather Service Cooperative Observer Network and First-Order station totals as of this morning’s report (data either through the 13th or 14th, depending on how up-to-date…

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