Daylight through the yearLongest day (Jun 21): 15 h 1 min5:34 am – 8:35 pmShortest day (Dec 21): 9 h 20 min7:21 am – 4:41 pm
Sun todaySunrise –Sunset –
Natural hazardsOverall risk Relatively ModerateChester County, PA, compared with all US countiesHigher-risk hazardsWinter weather Very HighDrought Relatively HighStrong wind Relatively HighRiver flooding Relatively HighSource: FEMA National Risk Index (county level)
Air quality71% of days had good air in 2025259 of 363 days measured102 moderate, 1 unhealthy for sensitive groups, 1 unhealthy daysMedian index 43, worst day 157main pollutant: ozoneSource: US EPA Air Quality Index, Chester County monitors, PA
Drinking waterPa American Royersfordserves 49,508 people from surface waterNo health-based violations since 20211 monitoring or reporting violation since 2021Source: US EPA Safe Drinking Water Information System, largest system in the county
