{"location":{"city":"Siewierz","voivodeship":"Śląskie","community":"Gmina Siewierz","postalCode":"42-510","latitude":50.4702,"longitude":19.2352,"elevation":301},"climateZone":3,"standardOutsideTemp":-20,"annualMeanTemp":8.7,"monthly":[{"month":1,"outsideTemp":-2.03,"heatingDays":31,"degreeDayNum":620,"solarIrradianceKwhM2":28.8,"windSpeedAvg":6.1,"relativeHumidity":85.6,"outsideTempOnHeatingDays":-2.03},{"month":2,"outsideTemp":-0.86,"heatingDays":28,"degreeDayNum":533,"solarIrradianceKwhM2":48,"windSpeedAvg":5.99,"relativeHumidity":83.1,"outsideTempOnHeatingDays":-0.86},{"month":3,"outsideTemp":2.94,"heatingDays":31,"degreeDayNum":466,"solarIrradianceKwhM2":90,"windSpeedAvg":5.99,"relativeHumidity":76.6,"outsideTempOnHeatingDays":2.94},{"month":4,"outsideTemp":8.71,"heatingDays":29,"degreeDayNum":279,"solarIrradianceKwhM2":131,"windSpeedAvg":5.35,"relativeHumidity":70.4,"outsideTempOnHeatingDays":8.61},{"month":5,"outsideTemp":13.6,"heatingDays":27,"degreeDayNum":142,"solarIrradianceKwhM2":157.4,"windSpeedAvg":5.13,"relativeHumidity":71.9,"outsideTempOnHeatingDays":12.74},{"month":6,"outsideTemp":17.07,"heatingDays":18,"degreeDayNum":56,"solarIrradianceKwhM2":160.6,"windSpeedAvg":4.94,"relativeHumidity":72.5,"outsideTempOnHeatingDays":14.88},{"month":7,"outsideTemp":18.96,"heatingDays":12,"degreeDayNum":26,"solarIrradianceKwhM2":161.2,"windSpeedAvg":4.79,"relativeHumidity":72.6,"outsideTempOnHeatingDays":15.92},{"month":8,"outsideTemp":18.83,"heatingDays":12,"degreeDayNum":27,"solarIrradianceKwhM2":141.9,"windSpeedAvg":4.58,"relativeHumidity":71.6,"outsideTempOnHeatingDays":15.8},{"month":9,"outsideTemp":14.07,"heatingDays":26,"degreeDayNum":123,"solarIrradianceKwhM2":93.5,"windSpeedAvg":5.06,"relativeHumidity":76.2,"outsideTempOnHeatingDays":13.3},{"month":10,"outsideTemp":9.06,"heatingDays":30,"degreeDayNum":277,"solarIrradianceKwhM2":58.7,"windSpeedAvg":5.39,"relativeHumidity":81,"outsideTempOnHeatingDays":9.03},{"month":11,"outsideTemp":4.12,"heatingDays":30,"degreeDayNum":416,"solarIrradianceKwhM2":30.8,"windSpeedAvg":5.52,"relativeHumidity":85.9,"outsideTempOnHeatingDays":4.12},{"month":12,"outsideTemp":-0.41,"heatingDays":31,"degreeDayNum":570,"solarIrradianceKwhM2":22,"windSpeedAvg":6.02,"relativeHumidity":86.2,"outsideTempOnHeatingDays":-0.41}],"groundTemp1m":9.2,"groundTemp2m":9.2,"solarIrradianceKwhM2Year":1123.8,"windSpeedAvg":5.4,"relativeHumidityAvg":77.8,"suitability":{"score":63,"rating":"fair","color":"yellow","estimatedScop":4.1,"notes":["Wysokie nasłonecznienie — bardzo dobre warunki dla hybrydy pompa ciepła + PV.","Wysoka średnia prędkość wiatru (5.4 m/s) — większe straty przez infiltrację."]},"_meta":{"source":"OPEN_METEO_ERA5_LAND_1991_2020","sourceLabel":"ERA5-Land Reanalysis (1991–2020)","fetchedAt":"2026-05-19T12:09:01.920Z","attribution":"Weather data by Open-Meteo.com (CC BY 4.0)","legalRef":"PN-B-02403:1982 (climateZone, standardOutsideTemp)","apiVersion":"v1"}}