Daylight through the yearLongest day (Jun 21): 15 h 22 min5:03 am – 8:26 pmShortest day (Dec 21): 9 h 0 min7:11 am – 4:11 pm
Sun todaySunrise –Sunset –
Natural hazardsOverall risk Relatively ModerateRockingham County, NH, compared with all US countiesHigher-risk hazardsCoastal flooding Relatively HighIce storm Relatively HighSource: FEMA National Risk Index (county level)
Air quality85% of days had good air in 2025309 of 365 days measured54 moderate, 2 unhealthy for sensitive groups daysMedian index 38, worst day 150main pollutant: ozoneSource: US EPA Air Quality Index, Rockingham County monitors, NH
Drinking waterPortsmouth Water Worksserves 33,000 people from surface waterNo health-based violations since 2021Source: US EPA Safe Drinking Water Information System, largest system serving the town
