{
    "dataset": "Ilystics weather delay days \u2014 Seattle, WA",
    "landingPage": "https://ilystics.com/weather-delay-days/seattle-wa",
    "license": "https://creativecommons.org/licenses/by/4.0/",
    "attribution": "Ilystics LLC, https://ilystics.com",
    "sourceData": "NOAA NCEI Global Historical Climatology Network - Daily (GHCND), U.S. Government public domain",
    "algorithmVersion": "v2.3.0",
    "generatedAt": "2026-08-23T17:13:43+00:00",
    "baseline": {
        "startYear": 2016,
        "endYear": 2025,
        "observedDays": 3653
    },
    "location": {
        "metro": "Seattle",
        "state": "WA",
        "lat": 47.6062,
        "lng": -122.3321
    },
    "soilBasis": {
        "effectiveSoil": "silt",
        "baseDryingDays": 2,
        "label": "Silt, 2.0 base drying day(s)"
    },
    "station": [],
    "scope": "Soil-dependent site work only: earthwork, grading, excavation, foundations and underground utilities. Enclosed and vertical construction is not modelled.",
    "readMe": "Monthly figures are independent baselines and must not be summed into an annual total: doing so assumes a jobsite never improves over a year. See https://ilystics.com/weather-delay-days for the full explanation.",
    "months": [
        {
            "month": 1,
            "monthName": "January",
            "avgPrecipInches": 5.72,
            "lostWorkdaysMean": 16,
            "lostWorkdaysMedian": 17,
            "abnormalThreshold": 20,
            "dryingDaysPerRainDay": 0.69,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 18,
                "2017": 13,
                "2018": 19,
                "2019": 16,
                "2020": 22,
                "2021": 18,
                "2022": 13,
                "2023": 14,
                "2024": 21,
                "2025": 8
            }
        },
        {
            "month": 2,
            "monthName": "February",
            "avgPrecipInches": 4.1,
            "lostWorkdaysMean": 15,
            "lostWorkdaysMedian": 16,
            "abnormalThreshold": 18,
            "dryingDaysPerRainDay": 1.2,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 17,
                "2017": 18,
                "2018": 14,
                "2019": 18,
                "2020": 14,
                "2021": 18,
                "2022": 11,
                "2023": 14,
                "2024": 17,
                "2025": 13
            }
        },
        {
            "month": 3,
            "monthName": "March",
            "avgPrecipInches": 3.41,
            "lostWorkdaysMean": 15,
            "lostWorkdaysMedian": 16,
            "abnormalThreshold": 20,
            "dryingDaysPerRainDay": 1.07,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 18,
                "2017": 22,
                "2018": 12,
                "2019": 5,
                "2020": 11,
                "2021": 18,
                "2022": 19,
                "2023": 15,
                "2024": 12,
                "2025": 17
            }
        },
        {
            "month": 4,
            "monthName": "April",
            "avgPrecipInches": 2.58,
            "lostWorkdaysMean": 12,
            "lostWorkdaysMedian": 13,
            "abnormalThreshold": 17,
            "dryingDaysPerRainDay": 1.35,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 8,
                "2017": 16,
                "2018": 16,
                "2019": 7,
                "2020": 10,
                "2021": 3,
                "2022": 17,
                "2023": 17,
                "2024": 13,
                "2025": 13
            }
        },
        {
            "month": 5,
            "monthName": "May",
            "avgPrecipInches": 2.13,
            "lostWorkdaysMean": 9,
            "lostWorkdaysMedian": 9,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 1.3,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 6,
                "2017": 12,
                "2018": 1,
                "2019": 9,
                "2020": 13,
                "2021": 9,
                "2022": 17,
                "2023": 4,
                "2024": 14,
                "2025": 7
            }
        },
        {
            "month": 6,
            "monthName": "June",
            "avgPrecipInches": 1.6,
            "lostWorkdaysMean": 6,
            "lostWorkdaysMedian": 5,
            "abnormalThreshold": 9,
            "dryingDaysPerRainDay": 1.15,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 5,
                "2017": 4,
                "2018": 7,
                "2019": 2,
                "2020": 10,
                "2021": 5,
                "2022": 12,
                "2023": 4,
                "2024": 5,
                "2025": 2
            }
        },
        {
            "month": 7,
            "monthName": "July",
            "avgPrecipInches": 0.32,
            "lostWorkdaysMean": 2,
            "lostWorkdaysMedian": 1,
            "abnormalThreshold": 4,
            "dryingDaysPerRainDay": 0.67,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 2,
                "2017": 0,
                "2018": 0,
                "2019": 8,
                "2020": 1,
                "2021": 2,
                "2022": 0,
                "2023": 0,
                "2024": 2,
                "2025": 0
            }
        },
        {
            "month": 8,
            "monthName": "August",
            "avgPrecipInches": 0.65,
            "lostWorkdaysMean": 2,
            "lostWorkdaysMedian": 1,
            "abnormalThreshold": 4,
            "dryingDaysPerRainDay": 1,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 0,
                "2017": 0,
                "2018": 0,
                "2019": 3,
                "2020": 2,
                "2021": 0,
                "2022": 0,
                "2023": 2,
                "2024": 6,
                "2025": 3
            }
        },
        {
            "month": 9,
            "monthName": "September",
            "avgPrecipInches": 1.93,
            "lostWorkdaysMean": 6,
            "lostWorkdaysMedian": 6,
            "abnormalThreshold": 9,
            "dryingDaysPerRainDay": 1.04,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 6,
                "2017": 5,
                "2018": 3,
                "2019": 12,
                "2020": 7,
                "2021": 7,
                "2022": 0,
                "2023": 7,
                "2024": 5,
                "2025": 3
            }
        },
        {
            "month": 10,
            "monthName": "October",
            "avgPrecipInches": 4.01,
            "lostWorkdaysMean": 13,
            "lostWorkdaysMedian": 13,
            "abnormalThreshold": 16,
            "dryingDaysPerRainDay": 1.12,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 19,
                "2017": 10,
                "2018": 13,
                "2019": 14,
                "2020": 10,
                "2021": 16,
                "2022": 7,
                "2023": 15,
                "2024": 9,
                "2025": 12
            }
        },
        {
            "month": 11,
            "monthName": "November",
            "avgPrecipInches": 5.77,
            "lostWorkdaysMean": 17,
            "lostWorkdaysMedian": 17,
            "abnormalThreshold": 21,
            "dryingDaysPerRainDay": 0.95,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 22,
                "2017": 20,
                "2018": 9,
                "2019": 13,
                "2020": 16,
                "2021": 22,
                "2022": 16,
                "2023": 14,
                "2024": 20,
                "2025": 18
            }
        },
        {
            "month": 12,
            "monthName": "December",
            "avgPrecipInches": 6.14,
            "lostWorkdaysMean": 17,
            "lostWorkdaysMedian": 18,
            "abnormalThreshold": 20,
            "dryingDaysPerRainDay": 0.94,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 17,
                "2017": 13,
                "2018": 19,
                "2019": 15,
                "2020": 20,
                "2021": 21,
                "2022": 17,
                "2023": 20,
                "2024": 14,
                "2025": 18
            }
        }
    ]
}