{"location":{"city":"Popielów","voivodeship":"Mazowieckie","community":"Liw","postalCode":"07-100","latitude":52.4116,"longitude":21.9483,"elevation":131},"climateZone":3,"standardOutsideTemp":-20,"annualMeanTemp":8.6,"monthly":[{"month":1,"outsideTemp":-2.11,"heatingDays":31,"degreeDayNum":623,"solarIrradianceKwhM2":21.9,"windSpeedAvg":5.41,"relativeHumidity":85.2,"outsideTempOnHeatingDays":-2.11},{"month":2,"outsideTemp":-1.14,"heatingDays":28,"degreeDayNum":541,"solarIrradianceKwhM2":39.7,"windSpeedAvg":5.36,"relativeHumidity":83.1,"outsideTempOnHeatingDays":-1.14},{"month":3,"outsideTemp":2.45,"heatingDays":31,"degreeDayNum":482,"solarIrradianceKwhM2":83.5,"windSpeedAvg":5.38,"relativeHumidity":77,"outsideTempOnHeatingDays":2.45},{"month":4,"outsideTemp":8.45,"heatingDays":29,"degreeDayNum":287,"solarIrradianceKwhM2":126,"windSpeedAvg":4.87,"relativeHumidity":71.2,"outsideTempOnHeatingDays":8.32},{"month":5,"outsideTemp":13.84,"heatingDays":26,"degreeDayNum":137,"solarIrradianceKwhM2":161.4,"windSpeedAvg":4.73,"relativeHumidity":70.3,"outsideTempOnHeatingDays":12.8},{"month":6,"outsideTemp":17.28,"heatingDays":17,"degreeDayNum":51,"solarIrradianceKwhM2":164.6,"windSpeedAvg":4.62,"relativeHumidity":70.6,"outsideTempOnHeatingDays":15.12},{"month":7,"outsideTemp":19.36,"heatingDays":10,"degreeDayNum":19,"solarIrradianceKwhM2":164,"windSpeedAvg":4.43,"relativeHumidity":71.6,"outsideTempOnHeatingDays":16.17},{"month":8,"outsideTemp":18.87,"heatingDays":12,"degreeDayNum":25,"solarIrradianceKwhM2":139.2,"windSpeedAvg":4.34,"relativeHumidity":71.3,"outsideTempOnHeatingDays":15.95},{"month":9,"outsideTemp":13.99,"heatingDays":26,"degreeDayNum":125,"solarIrradianceKwhM2":89.1,"windSpeedAvg":4.7,"relativeHumidity":76.9,"outsideTempOnHeatingDays":13.3},{"month":10,"outsideTemp":8.6,"heatingDays":30,"degreeDayNum":291,"solarIrradianceKwhM2":53.4,"windSpeedAvg":5.07,"relativeHumidity":81.7,"outsideTempOnHeatingDays":8.58},{"month":11,"outsideTemp":3.67,"heatingDays":30,"degreeDayNum":429,"solarIrradianceKwhM2":24.6,"windSpeedAvg":5.12,"relativeHumidity":86.4,"outsideTempOnHeatingDays":3.67},{"month":12,"outsideTemp":-0.44,"heatingDays":31,"degreeDayNum":571,"solarIrradianceKwhM2":15.8,"windSpeedAvg":5.25,"relativeHumidity":86.5,"outsideTempOnHeatingDays":-0.44}],"groundTemp1m":8.89,"groundTemp2m":8.89,"solarIrradianceKwhM2Year":1083.1,"windSpeedAvg":4.94,"relativeHumidityAvg":77.6,"suitability":{"score":63,"rating":"fair","color":"yellow","estimatedScop":4.1,"notes":["Wysokie nasłonecznienie — bardzo dobre warunki dla hybrydy pompa ciepła + PV."]},"_meta":{"source":"OPEN_METEO_ERA5_LAND_1991_2020","sourceLabel":"ERA5-Land Reanalysis (1991–2020)","fetchedAt":"2026-05-19T12:21:35.514Z","attribution":"Weather data by Open-Meteo.com (CC BY 4.0)","legalRef":"PN-B-02403:1982 (climateZone, standardOutsideTemp)","apiVersion":"v1"}}