{ "meta": { "title": "Frozen Pipe Risk by U.S. City", "generatedAt": "2026-10-27", "source": { "name": "NOAA NCEI U.S. Climate Normals 1991–2020 (annual/seasonal)", "url": "https://www.ncei.noaa.gov/products/land-based-station/us-climate-normals", "api": "https://www.ncei.noaa.gov/access/services/data/v1?dataset=normals-annualseasonal-1991-2020", "accessed": "2026-10-27" }, "threshold": { "f": 20, "source": "Multnomah County, Oregon (citing University of Illinois Building Research Council field tests)", "url": "https://multco.us/file/46297/download" }, "cities": 509, "stations": 344, "atLeastOne20": 385, "atLeastOne32": 461, "tiers": { "Rare": { "cities": 112, "medianFirst20": "01/12", "medianNights20": 0.0 }, "Occasional": { "cities": 118, "medianFirst20": "01/01", "medianNights20": 3.4 }, "Seasonal": { "cities": 133, "medianFirst20": "12/03", "medianNights20": 25.7 }, "Severe": { "cities": 146, "medianFirst20": "11/17", "medianNights20": 61.5 } }, "license": "CC BY 4.0", "attribution": "HearthDry (2026). Frozen Pipe Risk by U.S. City. https://hearthdry.com/research/frozen-pipe-risk-by-city", "fields": { "nights32": "Average nights a year with a low at or below 32°F", "nights20": "Average nights a year with a low at or below 20°F (hard freeze)", "nights10": "Average nights a year with a low at or below 10°F", "nights0": "Average nights a year with a low at or below 0°F", "iceDays": "Average days a year the high stays at or below 32°F", "first32": "Median date (MM/DD) of the first 32°F low", "first20": "Median date of the first 20°F low; blank if none in a typical year", "last20": "Median date of the last 20°F low", "last32": "Median date of the last 32°F low", "winterLow": "December–February normal low, °F", "tier": "Rare (<0.5 nights at 20°F), Occasional (0.5–10), Seasonal (10–40), Severe (>40)", "stationKm": "Distance from the city center to the NOAA station, km" } }, "states": [ { "state": "ND", "name": "North Dakota", "cities": 4, "medianNights20": 109.0, "medianNights32": 180.6, "maxCity": "Grand Forks", "maxNights20": 117.4 }, { "state": "AK", "name": "Alaska", "cities": 5, "medianNights20": 106.6, "medianNights32": 183.9, "maxCity": "Fairbanks", "maxNights20": 173.8 }, { "state": "SD", "name": "South Dakota", "cities": 4, "medianNights20": 97.7, "medianNights32": 174.2, "maxCity": "Aberdeen", "maxNights20": 110.1 }, { "state": "WY", "name": "Wyoming", "cities": 5, "medianNights20": 85.4, "medianNights32": 183.1, "maxCity": "Laramie", "maxNights20": 113.1 }, { "state": "MN", "name": "Minnesota", "cities": 15, "medianNights20": 81.8, "medianNights32": 147.3, "maxCity": "Duluth", "maxNights20": 104.5 }, { "state": "MT", "name": "Montana", "cities": 5, "medianNights20": 73.8, "medianNights32": 169.8, "maxCity": "Bozeman", "maxNights20": 103.5 }, { "state": "WI", "name": "Wisconsin", "cities": 8, "medianNights20": 73.2, "medianNights32": 146.2, "maxCity": "Eau Claire", "maxNights20": 91.8 }, { "state": "VT", "name": "Vermont", "cities": 3, "medianNights20": 72.7, "medianNights32": 144.7, "maxCity": "Barre", "maxNights20": 89.1 }, { "state": "ME", "name": "Maine", "cities": 5, "medianNights20": 71.9, "medianNights32": 151.4, "maxCity": "Bangor", "maxNights20": 84.5 }, { "state": "IA", "name": "Iowa", "cities": 6, "medianNights20": 66.2, "medianNights32": 139.8, "maxCity": "Sioux City", "maxNights20": 78.8 }, { "state": "NE", "name": "Nebraska", "cities": 4, "medianNights20": 63.0, "medianNights32": 138.7, "maxCity": "Lincoln", "maxNights20": 68.7 }, { "state": "NH", "name": "New Hampshire", "cities": 7, "medianNights20": 62.4, "medianNights32": 144.9, "maxCity": "Concord", "maxNights20": 76.8 }, { "state": "CO", "name": "Colorado", "cities": 11, "medianNights20": 61.5, "medianNights32": 155.7, "maxCity": "Pueblo", "maxNights20": 84.1 }, { "state": "IL", "name": "Illinois", "cities": 12, "medianNights20": 53.0, "medianNights32": 127.2, "maxCity": "Aurora", "maxNights20": 61.7 }, { "state": "MI", "name": "Michigan", "cities": 14, "medianNights20": 51.8, "medianNights32": 129.4, "maxCity": "Ann Arbor", "maxNights20": 63.9 }, { "state": "MA", "name": "Massachusetts", "cities": 11, "medianNights20": 43.6, "medianNights32": 116.5, "maxCity": "Springfield", "maxNights20": 59.7 }, { "state": "OH", "name": "Ohio", "cities": 15, "medianNights20": 39.7, "medianNights32": 112.4, "maxCity": "Youngstown", "maxNights20": 48.5 }, { "state": "PA", "name": "Pennsylvania", "cities": 14, "medianNights20": 39.6, "medianNights32": 114.6, "maxCity": "Scranton", "maxNights20": 45.4 }, { "state": "IN", "name": "Indiana", "cities": 7, "medianNights20": 37.3, "medianNights32": 105.9, "maxCity": "South Bend", "maxNights20": 50.0 }, { "state": "KS", "name": "Kansas", "cities": 6, "medianNights20": 36.5, "medianNights32": 101.9, "maxCity": "Lawrence", "maxNights20": 50.2 }, { "state": "RI", "name": "Rhode Island", "cities": 5, "medianNights20": 34.0, "medianNights32": 109.0, "maxCity": "Central Falls", "maxNights20": 34.0 }, { "state": "UT", "name": "Utah", "cities": 7, "medianNights20": 32.1, "medianNights32": 111.8, "maxCity": "Park City", "maxNights20": 92.4 }, { "state": "CT", "name": "Connecticut", "cities": 9, "medianNights20": 31.5, "medianNights32": 104.7, "maxCity": "Danbury", "maxNights20": 50.3 }, { "state": "MO", "name": "Missouri", "cities": 12, "medianNights20": 31.0, "medianNights32": 96.3, "maxCity": "St. Joseph", "maxNights20": 53.0 }, { "state": "WV", "name": "West Virginia", "cities": 5, "medianNights20": 30.2, "medianNights32": 101.9, "maxCity": "Wheeling", "maxNights20": 37.0 }, { "state": "NY", "name": "New York", "cities": 14, "medianNights20": 26.9, "medianNights32": 96.8, "maxCity": "Utica", "maxNights20": 65.1 }, { "state": "ID", "name": "Idaho", "cities": 6, "medianNights20": 23.0, "medianNights32": 108.2, "maxCity": "Idaho Falls", "maxNights20": 84.9 }, { "state": "KY", "name": "Kentucky", "cities": 4, "medianNights20": 22.5, "medianNights32": 85.7, "maxCity": "Covington", "maxNights20": 29.3 }, { "state": "DE", "name": "Delaware", "cities": 4, "medianNights20": 21.4, "medianNights32": 91.6, "maxCity": "Middletown", "maxNights20": 21.4 }, { "state": "NJ", "name": "New Jersey", "cities": 12, "medianNights20": 20.1, "medianNights32": 79.9, "maxCity": "Edison", "maxNights20": 40.1 }, { "state": "OK", "name": "Oklahoma", "cities": 7, "medianNights20": 15.2, "medianNights32": 72.2, "maxCity": "Broken Arrow", "maxNights20": 19.5 }, { "state": "NM", "name": "New Mexico", "cities": 4, "medianNights20": 14.2, "medianNights32": 92.8, "maxCity": "Santa Fe", "maxNights20": 50.4 }, { "state": "TN", "name": "Tennessee", "cities": 12, "medianNights20": 13.7, "medianNights32": 66.3, "maxCity": "Johnson City", "maxNights20": 22.2 }, { "state": "AR", "name": "Arkansas", "cities": 6, "medianNights20": 10.2, "medianNights32": 64.0, "maxCity": "Fayetteville", "maxNights20": 25.0 }, { "state": "MD", "name": "Maryland", "cities": 6, "medianNights20": 9.9, "medianNights32": 60.1, "maxCity": "Gaithersburg", "maxNights20": 25.0 }, { "state": "VA", "name": "Virginia", "cities": 16, "medianNights20": 9.9, "medianNights32": 60.1, "maxCity": "Manassas", "maxNights20": 25.0 }, { "state": "DC", "name": "District of Columbia", "cities": 1, "medianNights20": 9.9, "medianNights32": 60.1, "maxCity": "Washington", "maxNights20": 9.9 }, { "state": "NC", "name": "North Carolina", "cities": 11, "medianNights20": 7.6, "medianNights32": 63.6, "maxCity": "Greensboro", "maxNights20": 10.2 }, { "state": "GA", "name": "Georgia", "cities": 14, "medianNights20": 4.3, "medianNights32": 47.6, "maxCity": "Peachtree City", "maxNights20": 6.7 }, { "state": "AL", "name": "Alabama", "cities": 7, "medianNights20": 3.5, "medianNights32": 47.0, "maxCity": "Decatur", "maxNights20": 9.5 }, { "state": "OR", "name": "Oregon", "cities": 9, "medianNights20": 2.6, "medianNights32": 51.8, "maxCity": "Bend", "maxNights20": 50.1 }, { "state": "SC", "name": "South Carolina", "cities": 13, "medianNights20": 1.8, "medianNights32": 33.3, "maxCity": "Rock Hill", "maxNights20": 8.6 }, { "state": "MS", "name": "Mississippi", "cities": 6, "medianNights20": 1.8, "medianNights32": 32.9, "maxCity": "Southaven", "maxNights20": 5.9 }, { "state": "TX", "name": "Texas", "cities": 40, "medianNights20": 1.6, "medianNights32": 23.1, "maxCity": "Amarillo", "maxNights20": 28.2 }, { "state": "WA", "name": "Washington", "cities": 15, "medianNights20": 1.6, "medianNights32": 28.8, "maxCity": "Spokane", "maxNights20": 22.6 }, { "state": "LA", "name": "Louisiana", "cities": 12, "medianNights20": 0.4, "medianNights32": 14.8, "maxCity": "Monroe", "maxNights20": 1.7 }, { "state": "NV", "name": "Nevada", "cities": 9, "medianNights20": 0.0, "medianNights32": 10.7, "maxCity": "Carson City", "maxNights20": 76.4 }, { "state": "AZ", "name": "Arizona", "cities": 14, "medianNights20": 0.0, "medianNights32": 0.6, "maxCity": "Flagstaff", "maxNights20": 72.6 }, { "state": "FL", "name": "Florida", "cities": 34, "medianNights20": 0.0, "medianNights32": 0.4, "maxCity": "Tallahassee", "maxNights20": 1.4 }, { "state": "CA", "name": "California", "cities": 29, "medianNights20": 0.0, "medianNights32": 1.1, "maxCity": "Santa Rosa", "maxNights20": 0.1 }, { "state": "HI", "name": "Hawaii", "cities": 5, "medianNights20": 0.0, "medianNights32": 0.0, "maxCity": "Hilo", "maxNights20": 0.0 } ], "cities": [ { "city": "Fairbanks", "state": "AK", "population": 32000, "nights32": 221.7, "nights20": 173.8, "nights10": 146.4, "nights0": 113.8, "iceDays": 154.0, "first32": "09/13", "first20": "10/08", "last20": "04/20", "last32": "05/13", "winterLow": -13.8, "tier": "Severe", "station": "USW00026411", "stationName": "FAIRBANKS INTL AP", "stationKm": 8.4 }, { "city": "Grand Forks", "state": "ND", "population": 59000, "nights32": 184.7, "nights20": 117.4, "nights10": 81.0, "nights0": 51.1, "iceDays": 101.3, "first32": "09/27", "first20": "10/26", "last20": "04/13", "last32": "05/16", "winterLow": 0.6, "tier": "Severe", "station": "USW00014916", "stationName": "GRAND FORKS INTL AP", "stationKm": 11.4 }, { "city": "Laramie", "state": "WY", "population": 32000, "nights32": 211.9, "nights20": 113.1, "nights10": 54.9, "nights0": 22.7, "iceDays": 54.2, "first32": "09/15", "first20": "10/12", "last20": "05/02", "last32": "06/02", "winterLow": 10.8, "tier": "Severe", "station": "USW00024022", "stationName": "LARAMIE RGNL AP", "stationKm": 7.0 }, { "city": "Bismarck", "state": "ND", "population": 75000, "nights32": 184.3, "nights20": 110.4, "nights10": 65.0, "nights0": 36.7, "iceDays": 77.0, "first32": "09/27", "first20": "10/24", "last20": "04/14", "last32": "05/14", "winterLow": 5.9, "tier": "Severe", "station": "USW00024011", "stationName": "BISMARCK", "stationKm": 4.5 }, { "city": "Aberdeen", "state": "SD", "population": 28000, "nights32": 178.9, "nights20": 110.1, "nights10": 66.7, "nights0": 38.5, "iceDays": 78.0, "first32": "09/26", "first20": "10/24", "last20": "04/11", "last32": "05/09", "winterLow": 5.4, "tier": "Severe", "station": "USW00014929", "stationName": "ABERDEEN", "stationKm": 5.8 }, { "city": "Anchorage", "state": "AK", "population": 291247, "nights32": 183.9, "nights20": 108.4, "nights10": 59.9, "nights0": 27.5, "iceDays": 100.4, "first32": "09/29", "first20": "10/25", "last20": "04/04", "last32": "05/01", "winterLow": 10.6, "tier": "Severe", "station": "USW00026409", "stationName": "ANCHORAGE MERRILL FLD", "stationKm": 2.4 }, { "city": "Fargo", "state": "ND", "population": 125990, "nights32": 172.4, "nights20": 107.6, "nights10": 71.0, "nights0": 41.7, "iceDays": 92.7, "first32": "09/30", "first20": "10/31", "last20": "04/11", "last32": "05/10", "winterLow": 3.9, "tier": "Severe", "station": "USW00014914", "stationName": "FARGO HECTOR INTL AP", "stationKm": 5.6 }, { "city": "Wasilla", "state": "AK", "population": 11000, "nights32": 186.7, "nights20": 106.6, "nights10": 62.2, "nights0": 28.3, "iceDays": 95.4, "first32": "09/25", "first20": "10/21", "last20": "04/06", "last32": "05/06", "winterLow": 11.0, "tier": "Severe", "station": "USW00025331", "stationName": "PALMER MUNI AP", "stationKm": 18.5 }, { "city": "Minot", "state": "ND", "population": 48000, "nights32": 176.8, "nights20": 105.3, "nights10": 66.7, "nights0": 38.5, "iceDays": 86.5, "first32": "10/01", "first20": "10/28", "last20": "04/10", "last32": "05/10", "winterLow": 7.1, "tier": "Severe", "station": "USW00024013", "stationName": "MINOT INTL AP", "stationKm": 3.1 }, { "city": "Watertown", "state": "SD", "population": 22000, "nights32": 174.1, "nights20": 105.0, "nights10": 62.4, "nights0": 35.4, "iceDays": 84.2, "first32": "09/30", "first20": "10/30", "last20": "04/10", "last32": "05/07", "winterLow": 6.4, "tier": "Severe", "station": "USW00014946", "stationName": "WATERTOWN RGNL AP", "stationKm": 2.8 }, { "city": "Duluth", "state": "MN", "population": 86618, "nights32": 176.6, "nights20": 104.5, "nights10": 66.0, "nights0": 37.7, "iceDays": 99.4, "first32": "10/01", "first20": "11/05", "last20": "04/11", "last32": "05/13", "winterLow": 6.0, "tier": "Severe", "station": "USW00014913", "stationName": "DULUTH", "stationKm": 10.0 }, { "city": "Bozeman", "state": "MT", "population": 55000, "nights32": 197.9, "nights20": 103.5, "nights10": 53.7, "nights0": 24.0, "iceDays": 48.1, "first32": "09/16", "first20": "10/19", "last20": "04/15", "last32": "05/26", "winterLow": 10.9, "tier": "Severe", "station": "USW00024132", "stationName": "BOZEMAN GALLATIN FLD", "stationKm": 15.4 }, { "city": "St. Cloud", "state": "MN", "population": 68000, "nights32": 172.5, "nights20": 102.5, "nights10": 64.6, "nights0": 35.7, "iceDays": 83.5, "first32": "09/30", "first20": "11/01", "last20": "04/06", "last32": "05/07", "winterLow": 6.4, "tier": "Severe", "station": "USW00014926", "stationName": "ST CLOUD RGNL AP", "stationKm": 8.9 }, { "city": "Rock Springs", "state": "WY", "population": 24000, "nights32": 188.6, "nights20": 93.2, "nights10": 38.9, "nights0": 11.2, "iceDays": 61.8, "first32": "09/28", "first20": "10/27", "last20": "04/12", "last32": "05/22", "winterLow": 14.2, "tier": "Severe", "station": "USW00024027", "stationName": "ROCK SPRINGS AP", "stationKm": 12.5 }, { "city": "Park City", "state": "UT", "population": 8300, "nights32": 203.1, "nights20": 92.4, "nights10": 39.2, "nights0": 14.2, "iceDays": 23.3, "first32": "09/12", "first20": "10/21", "last20": "04/15", "last32": "06/07", "winterLow": 14.8, "tier": "Severe", "station": "USW00024120", "stationName": "COALVILLE", "stationKm": 29.6 }, { "city": "Eau Claire", "state": "WI", "population": 69511, "nights32": 162.8, "nights20": 91.8, "nights10": 52.9, "nights0": 27.5, "iceDays": 73.3, "first32": "10/04", "first20": "11/05", "last20": "04/05", "last32": "05/08", "winterLow": 9.2, "tier": "Severe", "station": "USW00014991", "stationName": "EAU CLAIRE RGNL AP", "stationKm": 6.2 }, { "city": "Sioux Falls", "state": "SD", "population": 192517, "nights32": 162.0, "nights20": 90.4, "nights10": 49.6, "nights0": 24.9, "iceDays": 65.6, "first32": "10/06", "first20": "11/04", "last20": "04/04", "last32": "05/01", "winterLow": 11.5, "tier": "Severe", "station": "USW00014944", "stationName": "SIOUX FALLS", "stationKm": 4.7 }, { "city": "Barre", "state": "VT", "population": 9000, "nights32": 169.2, "nights20": 89.1, "nights10": 51.5, "nights0": 23.1, "iceDays": 69.8, "first32": "09/29", "first20": "11/03", "last20": "04/09", "last32": "05/16", "winterLow": 10.5, "tier": "Severe", "station": "USW00094705", "stationName": "BARRE MONTPELIER AP", "stationKm": 6.2 }, { "city": "Rapid City", "state": "SD", "population": 74703, "nights32": 174.4, "nights20": 87.7, "nights10": 41.0, "nights0": 17.7, "iceDays": 43.1, "first32": "10/01", "first20": "10/26", "last20": "04/09", "last32": "05/12", "winterLow": 13.5, "tier": "Severe", "station": "USW00024090", "stationName": "RAPID CITY RGNL AP", "stationKm": 14.8 }, { "city": "Brooklyn Park", "state": "MN", "population": 82000, "nights32": 154.9, "nights20": 87.0, "nights10": 50.0, "nights0": 23.0, "iceDays": 72.6, "first32": "10/08", "first20": "11/07", "last20": "04/02", "last32": "04/30", "winterLow": 10.5, "tier": "Severe", "station": "USW00094960", "stationName": "MPLS CRYSTAL AP", "stationKm": 4.1 }, { "city": "Coon Rapids", "state": "MN", "population": 62480, "nights32": 154.9, "nights20": 87.0, "nights10": 50.0, "nights0": 23.0, "iceDays": 72.6, "first32": "10/08", "first20": "11/07", "last20": "04/02", "last32": "04/30", "winterLow": 10.5, "tier": "Severe", "station": "USW00094960", "stationName": "MPLS CRYSTAL AP", "stationKm": 7.6 }, { "city": "Maple Grove", "state": "MN", "population": 70000, "nights32": 154.9, "nights20": 87.0, "nights10": 50.0, "nights0": 23.0, "iceDays": 72.6, "first32": "10/08", "first20": "11/07", "last20": "04/02", "last32": "04/30", "winterLow": 10.5, "tier": "Severe", "station": "USW00094960", "stationName": "MPLS CRYSTAL AP", "stationKm": 8.3 }, { "city": "Plymouth", "state": "MN", 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