Daylight through the yearLongest day (Jun 21): 14 h 55 min5:43 am – 8:38 pmShortest day (Dec 21): 9 h 26 min7:24 am – 4:49 pm
Sun todaySunrise –Sunset –
ClimateWarmest month July: highs 87°F, lows 69°FColdest month January: highs 42°F, lows 27°F41 in of rain a year, on about 72 dayswettest month September6 in of snow a year, on about 4 days23 days above 90°F, 86 nights below freezing in a typical yearSource: NOAA 1991-2020 Climate Normals, Rockville 1 Ne station, 6 mi away; snow from Dalecarlia Rsvr
Parks and public landsKilgour Branch Svppark · under a mile · 77 acresGeorge Washington Memorial Parkwaynational park · 8.3 miWatss Branch Stream Valley Parkpark · under a mile · 148 acresSeneca Creek State Parkstate park · 7.1 miMatthew Henson Spstate park · 7.2 miClara Barton National Historic Sitehistoric site · 6.2 miSource: USGS Protected Areas Database (PAD-US)
Earthquakes2 of magnitude 3 or more within 50 miles since 19700 of magnitude 4+, 0 of magnitude 5+Largest: magnitude 3.6 on 16 Jul 201019 mi away, near Barnesville, MarylandMost recent: magnitude 3.0 on 17 Jan 201638 mi awaySource: USGS Earthquake Catalog
Natural hazardsOverall risk Relatively ModerateMontgomery County, MD, compared with all US countiesHigher-risk hazardsWinter weather Very HighHeat wave Relatively HighStrong wind Relatively HighHail Relatively HighSource: FEMA National Risk Index (county level)
Air quality83% of days had good air in 2025299 of 360 days measured61 moderate daysMedian index 39, worst day 90main pollutant: ozoneSource: US EPA Air Quality Index, Montgomery County monitors, MD
Drinking waterMcgregor Downs MHP (sc3260059)serves 626 people from ground water1 health-based violation since 2021latest Feb 2026: coliform bacteria, maximum contaminant level3 monitoring or reporting violations since 2021Source: US EPA Safe Drinking Water Information System, largest system serving the town
Elevation380 ft116 m above sea levelSource: USGS 3D Elevation Program
Local servicesHospitalAdventist Healthcare Shady Grove Medical Center4.7 miPost officePotomac Post Office1.1 miTown hallRockville City Hall5.0 miPoliceMaryland State Police Barrack N - Rockville3.5 miFire stationCabin John Park Volunteer Fire Department - Station 301.6 miSource: USGS National Structures Dataset
SchoolsWithin 2 mi5 schools4 elementary, 1 otherElementaryPotomac Elementary Schoolunder a mileSchoolBullis School1.2 miElementarySaint Andrew's Episcopal Lower School1.3 miCollegeThe Universities at Shady Grove4.4 miSource: USGS National Structures Dataset
Getting aroundAirportWashington Dulles International Airport IAD14 miInterstateI-2703.9 miUS highwayUS 2910 miAmtrakRockville, MD RKV5.4 miSubwayRockville - East Side of Hungerford Dr. (Rt. 355) Near Park Ave.Washington Metro5.4 miCoachBethesda, MD (North Bethesda Metro Station, bus stop on east side of Rockville Pike near the intersection of Marinelli Drive)OurBus5.9 miTransit3 stops within a mileWashington MetroSources: OurAirports; US Census Bureau TIGER roads; Bureau of Transportation Statistics NTAD
Distances in these cards are measured from the centre of the 20859 ZIP area.
