{
    "dataset": "Ilystics weather delay days \u2014 Boston, MA",
    "landingPage": "https://ilystics.com/weather-delay-days/boston-ma",
    "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": "2026-08-23T17:12:31+00:00",
    "baseline": {
        "startYear": 2016,
        "endYear": 2025,
        "observedDays": 3653
    },
    "location": {
        "metro": "Boston",
        "state": "MA",
        "lat": 42.3601,
        "lng": -71.0589
    },
    "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": 3.69,
            "lostWorkdaysMean": 16,
            "lostWorkdaysMedian": 19,
            "abnormalThreshold": 21,
            "dryingDaysPerRainDay": 1.93,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 12,
                "2017": 19,
                "2018": 20,
                "2019": 19,
                "2020": 11,
                "2021": 7,
                "2022": 20,
                "2023": 18,
                "2024": 18,
                "2025": 20
            }
        },
        {
            "month": 2,
            "monthName": "February",
            "avgPrecipInches": 3.08,
            "lostWorkdaysMean": 14,
            "lostWorkdaysMedian": 15,
            "abnormalThreshold": 19,
            "dryingDaysPerRainDay": 1.38,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 15,
                "2017": 11,
                "2018": 15,
                "2019": 17,
                "2020": 16,
                "2021": 19,
                "2022": 19,
                "2023": 10,
                "2024": 4,
                "2025": 14
            }
        },
        {
            "month": 3,
            "monthName": "March",
            "avgPrecipInches": 4.12,
            "lostWorkdaysMean": 13,
            "lostWorkdaysMedian": 13,
            "abnormalThreshold": 16,
            "dryingDaysPerRainDay": 1.46,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 17,
                "2017": 12,
                "2018": 11,
                "2019": 10,
                "2020": 10,
                "2021": 14,
                "2022": 17,
                "2023": 14,
                "2024": 12,
                "2025": 13
            }
        },
        {
            "month": 4,
            "monthName": "April",
            "avgPrecipInches": 4.01,
            "lostWorkdaysMean": 12,
            "lostWorkdaysMedian": 13,
            "abnormalThreshold": 17,
            "dryingDaysPerRainDay": 1.12,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 11,
                "2017": 11,
                "2018": 16,
                "2019": 17,
                "2020": 17,
                "2021": 12,
                "2022": 13,
                "2023": 3,
                "2024": 9,
                "2025": 14
            }
        },
        {
            "month": 5,
            "monthName": "May",
            "avgPrecipInches": 3.43,
            "lostWorkdaysMean": 11,
            "lostWorkdaysMedian": 11,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 1.3,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 11,
                "2017": 11,
                "2018": 10,
                "2019": 16,
                "2020": 6,
                "2021": 11,
                "2022": 5,
                "2023": 8,
                "2024": 14,
                "2025": 14
            }
        },
        {
            "month": 6,
            "monthName": "June",
            "avgPrecipInches": 3.07,
            "lostWorkdaysMean": 8,
            "lostWorkdaysMedian": 8,
            "abnormalThreshold": 12,
            "dryingDaysPerRainDay": 1.19,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 5,
                "2017": 13,
                "2018": 8,
                "2019": 13,
                "2020": 4,
                "2021": 10,
                "2022": 5,
                "2023": 10,
                "2024": 8,
                "2025": 3
            }
        },
        {
            "month": 7,
            "monthName": "July",
            "avgPrecipInches": 4.28,
            "lostWorkdaysMean": 8,
            "lostWorkdaysMedian": 8,
            "abnormalThreshold": 13,
            "dryingDaysPerRainDay": 0.97,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 0,
                "2017": 7,
                "2018": 10,
                "2019": 12,
                "2020": 8,
                "2021": 15,
                "2022": 1,
                "2023": 15,
                "2024": 5,
                "2025": 4
            }
        },
        {
            "month": 8,
            "monthName": "August",
            "avgPrecipInches": 3.32,
            "lostWorkdaysMean": 8,
            "lostWorkdaysMedian": 6,
            "abnormalThreshold": 12,
            "dryingDaysPerRainDay": 1.14,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 5,
                "2017": 3,
                "2018": 11,
                "2019": 7,
                "2020": 4,
                "2021": 13,
                "2022": 4,
                "2023": 13,
                "2024": 12,
                "2025": 3
            }
        },
        {
            "month": 9,
            "monthName": "September",
            "avgPrecipInches": 3.17,
            "lostWorkdaysMean": 9,
            "lostWorkdaysMedian": 8,
            "abnormalThreshold": 12,
            "dryingDaysPerRainDay": 0.95,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 8,
                "2017": 8,
                "2018": 11,
                "2019": 7,
                "2020": 5,
                "2021": 12,
                "2022": 13,
                "2023": 12,
                "2024": 3,
                "2025": 7
            }
        },
        {
            "month": 10,
            "monthName": "October",
            "avgPrecipInches": 3.95,
            "lostWorkdaysMean": 10,
            "lostWorkdaysMedian": 10,
            "abnormalThreshold": 14,
            "dryingDaysPerRainDay": 1.24,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 10,
                "2017": 8,
                "2018": 15,
                "2019": 10,
                "2020": 11,
                "2021": 10,
                "2022": 13,
                "2023": 3,
                "2024": 7,
                "2025": 14
            }
        },
        {
            "month": 11,
            "monthName": "November",
            "avgPrecipInches": 3.24,
            "lostWorkdaysMean": 11,
            "lostWorkdaysMedian": 10,
            "abnormalThreshold": 16,
            "dryingDaysPerRainDay": 1.48,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 6,
                "2017": 14,
                "2018": 22,
                "2019": 14,
                "2020": 12,
                "2021": 10,
                "2022": 7,
                "2023": 10,
                "2024": 7,
                "2025": 8
            }
        },
        {
            "month": 12,
            "monthName": "December",
            "avgPrecipInches": 4.06,
            "lostWorkdaysMean": 14,
            "lostWorkdaysMedian": 15,
            "abnormalThreshold": 17,
            "dryingDaysPerRainDay": 1.9,
            "workdayCoveragePct": 100,
            "lostWorkdaysByYear": {
                "2016": 16,
                "2017": 15,
                "2018": 8,
                "2019": 17,
                "2020": 13,
                "2021": 10,
                "2022": 14,
                "2023": 13,
                "2024": 16,
                "2025": 16
            }
        }
    ]
}