Daylight through the yearLongest day (Jun 21): 14 h 3 min6:21 am – 8:24 pmShortest day (Dec 21): 10 h 14 min7:12 am – 5:26 pm
Sun todaySunrise –Sunset –
Natural hazardsOverall risk Very HighHarris County, TX, compared with all US countiesHigher-risk hazardsHurricane Very HighTornado Very HighRiver flooding Very HighCold wave Very HighSource: FEMA National Risk Index (county level)
Air quality11% of days had good air in 202540 of 365 days measured287 moderate, 28 unhealthy for sensitive groups, 10 unhealthy daysMedian index 62, worst day 172main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, Harris County monitors, TX
Drinking waterCity of Houstonserves 2,970,543 people from surface water1 health-based violation since 2021latest May 2025: surface water treatment, treatment techniqueSource: US EPA Safe Drinking Water Information System, largest system serving the town
