Daylight through the yearLongest day (Jun 21): 15 h 44 min5:24 am – 9:08 pmShortest day (Dec 21): 8 h 40 min7:53 am – 4:33 pm
Sun todaySunrise –Sunset –
Natural hazardsOverall risk Relatively ModerateYellowstone County, MT, compared with all US countiesHigher-risk hazardsWinter weather Very HighCold wave Relatively HighLightning Relatively HighSource: FEMA National Risk Index (county level)
Air quality86% of days had good air in 2025315 of 365 days measured50 moderate daysMedian index 38, worst day 91main pollutant: ozoneSource: US EPA Air Quality Index, Yellowstone County monitors, MT
Drinking waterCity of Billingsserves 114,000 people from surface waterNo health-based violations since 2021Source: US EPA Safe Drinking Water Information System, largest system serving the town
