{
    "dataset": "Ilystics weather delay days \u2014 Washington DC / NoVA, DC",
    "landingPage": "https://ilystics.com/weather-delay-days/washington-dc-nova-dc",
    "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": "2026-08-23T17:12:16+00:00",
    "baseline": {
        "startYear": 2016,
        "endYear": 2025,
        "observedDays": 3652
    },
    "location": {
        "metro": "Washington DC / NoVA",
        "state": "DC",
        "lat": 38.9072,
        "lng": -77.0369
    },
    "soilBasis": {
        "effectiveSoil": "clay",
        "baseDryingDays": 3,
        "label": "Clay, 3.0 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": 2.99,
            "lostWorkdaysMean": 14,
            "lostWorkdaysMedian": 15,
            "abnormalThreshold": 19,
            "dryingDaysPerRainDay": 3.19,
            "workdayCoveragePct": 99.5,
            "lostWorkdaysByYear": {
                "2016": 14.1,
                "2017": 20.1,
                "2018": 17.1,
                "2019": 20.1,
                "2020": 14.1,
                "2021": 9,
                "2022": 18.1,
                "2023": 8,
                "2024": 16.1,
                "2025": 8
            }
        },
        {
            "month": 2,
            "monthName": "February",
            "avgPrecipInches": 3.07,
            "lostWorkdaysMean": 13,
            "lostWorkdaysMedian": 14,
            "abnormalThreshold": 18,
            "dryingDaysPerRainDay": 1.35,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 17,
                "2017": 2,
                "2018": 16,
                "2019": 17,
                "2020": 11,
                "2021": 20,
                "2022": 8,
                "2023": 10,
                "2024": 8,
                "2025": 17
            }
        },
        {
            "month": 3,
            "monthName": "March",
            "avgPrecipInches": 3.01,
            "lostWorkdaysMean": 12,
            "lostWorkdaysMedian": 12,
            "abnormalThreshold": 15,
            "dryingDaysPerRainDay": 1.95,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 8,
                "2017": 18,
                "2018": 10,
                "2019": 15,
                "2020": 12,
                "2021": 11,
                "2022": 12,
                "2023": 5,
                "2024": 15,
                "2025": 9
            }
        },
        {
            "month": 4,
            "monthName": "April",
            "avgPrecipInches": 3.59,
            "lostWorkdaysMean": 10,
            "lostWorkdaysMedian": 10,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 1.63,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 6,
                "2017": 13,
                "2018": 9,
                "2019": 7,
                "2020": 17,
                "2021": 10,
                "2022": 14,
                "2023": 5,
                "2024": 7,
                "2025": 12
            }
        },
        {
            "month": 5,
            "monthName": "May",
            "avgPrecipInches": 5.56,
            "lostWorkdaysMean": 14,
            "lostWorkdaysMedian": 16,
            "abnormalThreshold": 19,
            "dryingDaysPerRainDay": 1.33,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 20,
                "2017": 15,
                "2018": 10,
                "2019": 16,
                "2020": 11,
                "2021": 6,
                "2022": 17,
                "2023": 8,
                "2024": 17,
                "2025": 20
            }
        },
        {
            "month": 6,
            "monthName": "June",
            "avgPrecipInches": 3.53,
            "lostWorkdaysMean": 12,
            "lostWorkdaysMedian": 11,
            "abnormalThreshold": 16,
            "dryingDaysPerRainDay": 1.47,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 11,
                "2017": 9,
                "2018": 18,
                "2019": 18,
                "2020": 13,
                "2021": 13,
                "2022": 9,
                "2023": 9,
                "2024": 5,
                "2025": 11
            }
        },
        {
            "month": 7,
            "monthName": "July",
            "avgPrecipInches": 5.92,
            "lostWorkdaysMean": 11,
            "lostWorkdaysMedian": 10,
            "abnormalThreshold": 17,
            "dryingDaysPerRainDay": 1.43,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 10,
                "2017": 15,
                "2018": 10,
                "2019": 10,
                "2020": 6,
                "2021": 7,
                "2022": 17,
                "2023": 21,
                "2024": 5,
                "2025": 13
            }
        },
        {
            "month": 8,
            "monthName": "August",
            "avgPrecipInches": 4.98,
            "lostWorkdaysMean": 13,
            "lostWorkdaysMedian": 15,
            "abnormalThreshold": 19,
            "dryingDaysPerRainDay": 1.45,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 13,
                "2017": 15,
                "2018": 16,
                "2019": 7,
                "2020": 18,
                "2021": 17,
                "2022": 19,
                "2023": 14,
                "2024": 11,
                "2025": 0
            }
        },
        {
            "month": 9,
            "monthName": "September",
            "avgPrecipInches": 4.34,
            "lostWorkdaysMean": 10,
            "lostWorkdaysMedian": 9,
            "abnormalThreshold": 15,
            "dryingDaysPerRainDay": 1.31,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 7,
                "2017": 7,
                "2018": 20,
                "2019": 0,
                "2020": 14,
                "2021": 7,
                "2022": 9,
                "2023": 12,
                "2024": 9,
                "2025": 12
            }
        },
        {
            "month": 10,
            "monthName": "October",
            "avgPrecipInches": 2.94,
            "lostWorkdaysMean": 9,
            "lostWorkdaysMedian": 9,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 1.71,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 5,
                "2017": 7,
                "2018": 12,
                "2019": 14,
                "2020": 17,
                "2021": 6,
                "2022": 11,
                "2023": 4,
                "2024": 5,
                "2025": 11
            }
        },
        {
            "month": 11,
            "monthName": "November",
            "avgPrecipInches": 2.87,
            "lostWorkdaysMean": 10,
            "lostWorkdaysMedian": 10,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 2.09,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 3,
                "2017": 11,
                "2018": 19,
                "2019": 9,
                "2020": 13,
                "2021": 7,
                "2022": 12,
                "2023": 8,
                "2024": 11,
                "2025": 9
            }
        },
        {
            "month": 12,
            "monthName": "December",
            "avgPrecipInches": 3.65,
            "lostWorkdaysMean": 12,
            "lostWorkdaysMedian": 13,
            "abnormalThreshold": 16,
            "dryingDaysPerRainDay": 2.19,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 18,
                "2017": 9,
                "2018": 13,
                "2019": 14,
                "2020": 16,
                "2021": 4,
                "2022": 12,
                "2023": 13,
                "2024": 11,
                "2025": 9
            }
        }
    ]
}