Daylight through the yearLongest day (Jun 21): 15 h 15 min5:48 am – 9:03 pmShortest day (Dec 21): 9 h 7 min7:48 am – 4:55 pm
Sun todaySunrise –Sunset –
ClimateWarmest month July: highs 84°F, lows 64°FColdest month January: highs 29°F, lows 10°F32 in of rain a year, on about 58 dayswettest month June29 in of snow a year, on about 17 days13 days above 90°F, 144 nights below freezing in a typical yearSource: NOAA 1991-2020 Climate Normals, Castana Exp Farm station, 7 mi away
Nearby landmarksMaple Riverriver · 2.5 miDurr Hillpeak · 3.4 miGranger Hillpeak · 4.5 miGuard Lakelake · 7.8 miCards Lake (historical)lake · 7.8 miSource: USGS Geographic Names Information System
Parks and public landsTurin Preserve Wildlife Management Areastate conservation land · under a mile · 805 acresTurin Loess Hills State Preservestate conservation land · under a mile · 215 acresLoess Hill Wildlife Management Areastate conservation land · 3.1 mi · 2,334 acresSylvan Runkel State Preservestate conservation land · 4.6 mi · 329 acresMonona Arboretumpark · 5.9 miGaukel Parkpark · 6.8 miSource: USGS Protected Areas Database (PAD-US)
EarthquakesNone of magnitude 3 or more within 50 miles since 1970Source: USGS Earthquake Catalog
Natural hazardsOverall risk Very LowMonona County, IA, compared with all US countiesHighest-rated hazardsDrought Relatively ModerateHail Relatively ModerateSource: FEMA National Risk Index (county level)
Air quality87% of days had good air in 2025291 of 336 days measured44 moderate, 1 unhealthy for sensitive groups daysMedian index 27, worst day 132main pollutant: fine particles (PM2.5)Source: US EPA Air Quality Index, nearest monitors: Washington County, NE, 37 mi away
Drinking waterOnawa Municipal Water Plantserves 2,906 people from ground waterNo health-based violations since 2021Source: US EPA Safe Drinking Water Information System, largest system in the county
Elevation1,237 ft377 m above sea levelSource: USGS 3D Elevation Program
Local servicesHospitalBurgess Health Medical Center7.3 miPost officeCastana Post Office4.1 miTown hallCastana City Hall4.0 miPoliceOnawa Police Department6.6 miFire stationCastana Fire and Rescue4.1 miSource: USGS National Structures Dataset
Getting aroundAirportSioux Gateway Airport / Brigadier General Bud Day Field SUX33 miMajor airportEppley Airfield OMA51 miInterstateI-298.0 miUS highwayUS 7515 miAmtrakOmaha, NE OMA54 miSources: OurAirports; US Census Bureau TIGER roads; Bureau of Transportation Statistics NTAD
Distances in these cards are measured from the centre of the 51059 ZIP area.
