Daylight through the yearLongest day (Jun 21): 15 h 8 min5:22 am – 8:30 pmShortest day (Dec 21): 9 h 13 min7:16 am – 4:29 pm
Sun todaySunrise –Sunset –
ClimateWarmest month July: highs 83°F, lows 65°FColdest month January: highs 37°F, lows 22°F48 in of rain a year, on about 77 dayswettest month September34 in of snow a year, on about 15 days10 days above 90°F, 105 nights below freezing in a typical yearSource: NOAA 1991-2020 Climate Normals, Westchester Co Ap station, 3 mi away; snow from Stamford 5 N
Nearby landmarksPutnam Lakelake · 1.0 miRockwood Lakelake · 1.8 miRound Hillpeak · 1.3 miEast Branch Byram Riverriver · 2.3 miSUNY Purchase Collegecollege · 3.6 miLong Island University Hudson - Westchestercollege · 3.7 miSource: USGS Geographic Names Information System
Parks and public landsMianus River State Park Scenic Reservestate park · 3.0 miJohnston Parkpark · 2.9 miTOWN OF NORTH CASTLE Landpark · 3.2 mi · 515 acresRockefeller State Park Preservestate park · 8.4 mi · 1,775 acresHutchinson River Pkwy Landsstate park · 8.5 miHart's Brook Nature Preserve and Arboretumstate park · 8.9 mi · 123 acresSource: USGS Protected Areas Database (PAD-US)
Earthquakes8 of magnitude 3 or more within 50 miles since 19700 of magnitude 4+, 0 of magnitude 5+Largest: magnitude 3.6 on 19 Oct 198512 mi away, near Greenville, New YorkMost recent: magnitude 3.0 on 3 Aug 202526 mi awaySource: USGS Earthquake Catalog
Natural hazardsOverall risk Relatively HighWestchester County, NY, compared with all US countiesHigher-risk hazardsStrong wind Very HighWinter weather Very HighLightning Very HighRiver flooding Relatively HighSource: FEMA National Risk Index (county level)
Air quality65% of days had good air in 2025236 of 365 days measured108 moderate, 19 unhealthy for sensitive groups, 2 unhealthy daysMedian index 44, worst day 174main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, Fairfield County monitors, CT
Drinking waterAquarion-eastern Fairfield Countyserves 351,756 people from surface waterNo health-based violations since 2021Source: US EPA Safe Drinking Water Information System, largest system serving the town
Elevation302 ft92 m above sea levelSource: USGS 3D Elevation Program
Local servicesHospitalGreenwich Hospital4.0 miPost officeGlenville Post Office3.4 miTown hallNorth Castle Town Hall3.8 miPoliceTown of North Castle Police Department3.8 miFire stationGreenwich Fire Department Station 6 Round Hillunder a mileSource: USGS National Structures Dataset
