Maryland Climate and Weather
  • MARYLAND STATE CLIMATE DATA
    • TEMPERATURES
      • STATEWIDE AVERAGES & DEPARTURES
        • Statewide Average Maximum Temperatures
        • Statewide Average Minimum Temperatures
        • Statewide Average Mean Temperatures
        • Statewide Average Mean Temperature Departures
        • ASOS & AWOS Station Temperature Archives
          • Maryland ASOS-AWOS Map
          • Western Maryland
            • Cumberland
            • Frederick
            • Hagerstown
            • Oakland-Garrett County
          • Central Maryland
            • Aberdeen-Phillips Field
            • Baltimore-Inner Harbor (Maryland Science Center)
            • Baltimore-Martin
            • Churchville-Harford County
            • Gaithersburg-Montgomery County
            • Westminster
          • Southern Maryland
            • Andrews Air Force Base
            • Annapolis
            • Baltimore Airport (BWI)
            • College Park
            • Ft. Meade-Tipton
            • Leonardtown-St. Mary’s County
            • Patuxent River Naval Air Station
            • St. Inigoes-Webster Field
          • Eastern Shore
            • Cambridge
            • Easton
            • Ocean City
            • Salisbury
            • Stevensville-Bay Bridge
        • RAWS Station Temperature Archives
          • RAWS – Station Map & Weblinks
          • Western Shore
            • Antietam National Battlefield
            • Catoctin Mountain
            • Cedarville
            • Green Ridge
            • Patuxent
            • Susquehanna
          • Eastern Shore
            • Assateague Island
            • Blackwater
            • Powellville
            • Tuckahoe
      • Top-10 Statewide Temperature Averages
      • Maryland Temperature Records: Cities
      • Maryland Temperature Extremes, by Calendar Year
      • Maryland Temperature Extremes, by Month
      • MARYLAND EXTREME LOW MAXIMUM TEMPERATURES, BY STATION
      • Maryland’s Top-30 Lowest Average Minimum Temperatures for July
      • Maryland Cities – Earliest-Latest Freezes & Shortest Growing Seasons
    • PRECIPITATION
      • Statewide Average Precipitation
      • STATEWIDE AVERAGE PRECIPITATION DEPARTURES
      • STATEWIDE EXTREMES
        • Maryland Precipitation Records: Cities
        • ANNUAL PRECIPITATION EXTREMES, BY YEAR
        • MONTHLY PRECIPITATION EXTREMES, BY YEAR
        • DAILY PRECIPITATION EXTREMES, BY YEAR
        • Monthly Precipitation Extremes, Overall
        • DAILY PRECIPITATION EXTREMES, BY MONTH
        • STATEWIDE TOP-10 AVERAGE PRECIPITATION EXTREMES, BY MONTH, SEASON, & YEAR
        • TOP-20 MAXIMUM DAILY-MONTHLY-ANNUAL PRECIPITATION TOTALS
        • Maryland Locations with ≥10.00 Inches of Daily Precipitation
    • SNOW
      • Maryland Record Snowfall and Snow Depth
      • Maryland Snowfall: Cities’ 365-Day-Period Maxima
      • Maryland Snowfall: Greatest Number of Days 1-inch or More
      • MARYLAND SNOW DEPTHS: GREATEST NUMBER OF DAYS WITH 1-INCH OR MORE ON THE GROUND
  • Baltimore Climate Data
    • TEMPERATURES
      • Baltimore Average Maximum Temperature Archive
      • Baltimore Average Minimum Temperature Archive
      • Baltimore Average Mean Temperature Archive: 1871-Present
      • Baltimore Historical Mean Temperatures: 1817-1870 (Pre-NWS)
      • Baltimore Calendar-Day Extremes
        • BALTIMORE – DAILY MAXIMUM/MINIMUM/MEAN TEMPERATURE EXTREMES
        • Baltimore – TOP-10 DAILY MAXIMUM/MINIMUM/MEAN TEMPERATURES, BY MONTH
      • Baltimore – Monthly Temperature Extremes by Year & Season_1871-Present
      • BALTIMORE TOP-10 MONTHLY, SEASONAL, & ANNUAL AVERAGES
      • Baltimore: Temperatures Days ≥90°/≤32°
        • Baltimore – Temperature Days ≥90°_MAXIMUMS
        • Baltimore: Temperature Days ≤32°F. MINIMUMS
        • Baltimore: Temperature Days ≤32°F. MAXIMUMS
      • Baltimore: Freezing Temperatures
        • Baltimore: First/Last Freeze Dates
        • Baltimore: Longest Consecutive Freezing Temperature Periods
    • PRECIPITATION
      • Baltimore Precipitation Archive: 1871-Present
      • Baltimore Historical Precipitation: 1817-1870 (PRE-NWS)
      • BALTIMORE PRECIPITATION: CALENDAR-DAY & TOP-10 MULTI-DAY EXTREMES
      • Baltimore Precipitation: Top-10 Monthly, Seasonal, & Annual Extremes
      • Baltimore City Precipitation within City Limits: Daily, Monthly, Annual Extremes
      • Baltimore Airport Precipitation: Daily, Monthly, Annual Extremes
      • BALTIMORE: DAYS WITH MEASURABLE PRECIPITATION
      • BALTIMORE: TOP-10 DAYS WITH MEASURABLE PRECIPITATION
      • Wet & Dry Streaks in Baltimore
    • SNOW
      • Baltimore Snowfall Archive
      • Baltimore – Calendar-Day Snowfall & Snow Depth Extremes
      • Baltimore Snowfall Records: Top-10 Months, Seasons, and Years
      • Baltimore Snowfall Records: Top-10 Calendar-Day/24-Hour, 2-Day & 3-Day Amounts
      • Baltimore: Top-20 Snowfalls & Snowstorms
      • Baltimore: Number of Days with Snowfall & Snow Depths
        • Baltimore: Number of Days with Snowfall ≥0.1 Inch
        • Baltimore: Number of Days with Snowfall ≥1.0 Inch
        • BALTIMORE: NUMBER OF DAYS WITH SNOW DEPTHS ≥1 INCH
      • Baltimore: First & Last Snowfall Occurrences, by Season
    • WIND
    • CHRISTMAS WEATHER
  • Washington, DC Climate Data
    • Temperatures
      • Washington-Downtown/Reagan National Airport
        • Washington, DC Average Maximum Temperature Archive: 1872-Present
        • Washington, DC Average Minimum Temperature Archive: 1872-Present
        • Washington, DC Mean Temperature Archive: 1871-Present
        • Washington, DC Calendar-Day Extremes
          • WASHINGTON, DC – DAILY MAX/MIN/MEAN TEMPERATURE EXTREMES
          • WASHINGTON DC – TOP-10 DAILY MAX/MIN/MEAN DAILY TEMPERATURES, BY MONTH
        • WASHINGTON, DC – MONTHLY TEMPERATURE EXTREMES BY YEAR & SEASON: 1872-PRESENT
        • WASHINGTON, DC TOP-10 MONTHLY & ANNUAL AVERAGES
        • Washington, DC: NUMBER OF DAYS ≥90°/≤32°
          • Washington, DC – Temperature Days ≥90°_MAXIMUMS
          • Washington, DC: Temperature Days ≤32°F. MINIMUMS
          • Washington, DC: Temperature Days ≤32°F. MAXIMUMS
        • WASHINGTON, DC: FREEZE PERIODS
      • Washington-Dulles International Airport
        • Dulles Airport – Average Maximum Temperature Archive
        • Dulles Airport – Average Minimum Temperatures
        • Dulles Airport – Mean Temperature Archive
        • DULLES AIRPORT – CALENDAR-DAY EXTREMES
          • DULLES AIRPORT – DAILY MAX/MIN/MEAN TEMPERATURE EXTREMES
          • DULLES AIRPORT – TOP-10 DAILY MAX/MIN/MEAN DAILY TEMPERATURES, BY MONTH
        • DULLES AIRPORT – MONTHLY TEMPERATURE EXTREMES BY YEAR & SEASON_1961-PRESENT
        • DULLES AIRPORT TOP-10 MONTHLY & ANNUAL AVERAGES
        • DULLES AP: NUMBER OF DAYS ≥90°/≤32°
          • Dulles AP: Temperature Days ≥90°_MAXIMUMS
          • Dulles International Airport: Temperature Days ≤32°F. MINIMUMS
          • Dulles International Airport: Temperature Days ≤32°F. MAXIMUMS
        • DULLES AIRPORT: FREEZE PERIODS
    • Precipitation
      • Downtown & Reagan National Airport
        • Washington, DC Precipitation Archive: 1871-Present
        • WASHINGTON, DC HISTORICAL PRECIPITATION: 1817-1870 (PRE-NATIONAL WEATHER SERVICE)
        • Washington, DC Precipitation: Calendar-Day & Top-10 Multi-Day Extremes
        • WASHINGTON, DC PRECIPITATION: TOP-10 MONTHLY, SEASONAL, & ANNUAL EXTREMES
        • WASHINGTON, DC: DAYS WITH MEASURABLE PRECIPITATION
        • WASHINGTON, DC – TOP-10 DAYS WITH MEASURABLE PRECIPITATION
        • District of Columbia Precipitation: Top-20 Daily, Monthly, Annual Extremes within District Boundaries
        • District of Columbia Precipitation: Daily, Monthly & Annual Extremes, by Month
        • Washington National Airport: Precipitation Extremes
      • Washington-Dulles International Airport
        • Dulles Airport – Precipitation Archive
        • DULLES AIRPORT PRECIPITATION: CALENDAR-DAY & TOP-10 MULTI-DAY EXTREMES
        • DULLES AIRPORT PRECIPITATION: TOP-10 MONTHLY, SEASONAL, & ANNUAL EXTREMES
        • Dulles Airport Precipitation: Daily, Monthly & Annual Extremes, by Month
        • DULLES AIRPORT: DAYS WITH MEASURABLE PRECIPITATION
        • DULLES AIRPORT – TOP-10 DAYS WITH MEASURABLE PRECIPITATION
    • SNOW
      • WASHINGTON, DC – CALENDAR-DAY SNOWFALL AND SNOW DEPTH EXTREMES
      • DULLES AIRPORT – CALENDAR-DAY SNOWFALL AND SNOW DEPTH EXTREMES
  • Current Observations
    • Current Area Observations (Text)
      • MD/DC/VA Current NWS Hourly Observations
      • MD Observations: MesoWest – Multiple Sources
      • Baltimore Airport (BWI) Hourly Observations
      • Washington-National Airport (DCA) Hourly Observations
      • Washington-Dulles Int’l Airport (IAD) Hourly Observations
      • Garrett County Airport (K2G4) Hourly Observations (Elev. 2933′)
      • ASOS & AWOS Stations: Maryland/DC/VA/WV Weather Observations
      • Maryland Mesonet Weather Stations
      • Marine Weather Stations
    • Current Area Observations (Maps)
      • Maryland Current Weather & Radar (NWS/Data Aggregated by Synoptic)
      • Baltimore-Washington Metro Current Weather (Weather Underground)
      • Maryland Current Weather (MesoWest)
      • Maryland 24-Hour Max/Min Temperatures (MesoWest)
      • CURRENT WEATHER – MD-DC-DE-VA-WV-PA (MesoWest – 150-Mile Radius from DC)
      • Maryland ASOS-AWOS Stations – METARS
      • DC/Virginia ASOS-AWOS Stations – METARS
      • Maryland Snowfall Map
  • RADARS
    • U.S. Radar Loop – Current (NWS)
    • Northeast U.S. Radar Loop (NWS)
    • MARYLAND RADAR (WINDY.COM)
    • Maryland Radar (WeatherBug)
    • Maryland Radar (Weather Underground)
    • Intellicast Radar Loop – Mid-Atlantic
    • Intellicast Loop – Metro Balt-Wash
  • NWS-Baltimore/DC WFO Climate Data, Records, & More
    • NWS-Baltimore/DC WFO – Climate Data from NWS
    • NWS-Baltimore/DC WFO – Daily ASOS/AWOS/COOP Data
    • NWS-Baltimore/DC WFO – Daily Hydrometeorological Products
    • NWS Baltimore/DC Public Info Statements
    • NWS Baltimore/DC Metro Local Storm Reports
    • NWS Baltimore/DC Forecaster’s Discussion
  • CoCoRaHS Precipitation – Maryland
  • Maryland Tornadoes
    • Archive
    • by Year
    • by Month
    • by Time of Day
    • by Intensity
    • by County
  • Maryland/DC Webcam Favorites
    • Maryland CHART Live Traffic Cameras
    • Western Maryland Webcams
      • WeatherBug Cams – Garrett/Allegany County Webcams – Northern & Southern High Schools, Bittinger VFD, Wisp Ski Resort, Sky Valley Lodge, EMA-Grantsville & Kitzmiller, Frostburg State Univ., Allegany High School
      • Wisp Ski Cams
      • Deep Creek Lake – Railey Realty
      • Deep Creek Lake – Honi Honi Bar
      • Route 40 Elementary Webcam (2600 ft)
      • Frostburg at Finzel
      • Frostburg State University, Frostburg, MD
      • Cumberland, MD (from Allegany High School)
      • Rocky Gap Casino – Lake Habeeb (Rocky Gap State Park) – real-time 180° view, Flintstone, MD
    • Central & Southern Maryland Webcams
      • Maryland Science Center – Baltimore Inner Harbor
      • Baltimore – Fell’s Point
      • Baltimore – Maryland Zoo
      • Annapolis – Eastport Yacht Club
      • University of Maryland-College Park Campus
      • Deale – Broadwater Point
      • Chesapeake Beach Resort (Calvert County)
    • Eastern Shore Webcams
      • Ocean City – Tons o’ Webcams
      • Ocean City Fishing Pier
      • Ocean City Life Saving Station
    • Washington, DC webcams
      • Capitol Dome
      • Jefferson Memorial View to Washington Monument & Capitol Dome
      • Kennedy Center View to Rosslyn
      • Panda Cams 1 & 2 – National Zoo (DC)
  • Mountain & Ski Weather
    • Garrett County
      • Backbone Mountain/Hoye-Crest – 3360 feet/1024 meters
      • Big Savage Mountain – 2959 feet/902 meters
    • Allegany County
      • Dan’s Mountain – 2897 feet/883 meters
      • Evitt’s Mountain – 2398 feet/731 meters
      • Warrior Mountain – 2185 feet/666 meters
      • Haystack Mountain – 1706 feet/520 meters
    • Washington County
      • Quirauk Mountain – 2145 feet/654 meters
      • Sideling Hill – 2120 feet/646 meters
      • Roundtop Hill – 1358 feet/414 meters
    • Frederick County
      • Catoctin Mountain – 1900 feet/579 meters
      • Lamb’s Knoll – 1759 feet/536 meters
      • Sugarloaf Mountain – 1283 feet/391 meters
    • Ski Area Weather & Snow Forecasts
      • MARYLAND
        • Wisp Ski Resort – Main Page
        • Wisp Ski Resort – Weather
        • Wisp Current Weather – Summit
        • Wisp Current Weather – Base
      • PENNSYLVANIA
        • Blue Knob Resort
        • Seven Springs Mountain
        • Ski Liberty
        • Ski Roundtop
        • Whitetail Resort
      • VIRGINIA
        • Bryce Resort
        • Massanutten
        • The Homestead Ski Area
        • Wintergreen Resort, VA
      • WEST VIRGINIA
        • Canaan Valley Resort
        • Snowshoe Mountain Resort, WV
        • Timberline Four Seasons Resort
  • Maryland Weather Trivia
    • Maryland’s Greatest 24-Hour Rainfall: Jan 26-27, 1897
    • World Record 1-Minute Rainfall – Unionville, Maryland
  • Current Maryland Weather Stations MAP
  • RESEARCHER/WEBSITE MANAGER – JEFF TAYLOR

Maryland Climate and Weather

Historical & Current Information for the State
Washington-Dulles International Airport: Precipitation Extremes

Washington-Dulles International Airport: Precipitation Extremes

Please click the link below to access a pdf version of the data.

Dulles-AP_-_All-Time-PRECIPITATION-Extremes_Updated-2025-04-06

Cover photo courtesy of Google Maps

 

Recent Posts

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  • Baltimore’s Late-Season Freezing Temperature
  • Maryland’s Record-Warm October in 2021

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Recent Comments

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  • Jeff on MARYLAND STATE ANNUAL PRECIPITATION RECORD – 2018 FINAL REPORT
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