{"location":{"city":"Hel","voivodeship":"Pomorskie","community":"Hel","postalCode":"84-150","latitude":54.6072,"longitude":18.8021,"elevation":4},"climateZone":1,"standardOutsideTemp":-16,"annualMeanTemp":8.9,"monthly":[{"month":1,"outsideTemp":0.39,"heatingDays":31,"degreeDayNum":545,"solarIrradianceKwhM2":19.1,"windSpeedAvg":8.32,"relativeHumidity":84.5,"outsideTempOnHeatingDays":0.39},{"month":2,"outsideTemp":0.68,"heatingDays":28,"degreeDayNum":489,"solarIrradianceKwhM2":37.3,"windSpeedAvg":8.07,"relativeHumidity":83.1,"outsideTempOnHeatingDays":0.68},{"month":3,"outsideTemp":2.87,"heatingDays":31,"degreeDayNum":469,"solarIrradianceKwhM2":82.1,"windSpeedAvg":7.61,"relativeHumidity":79.8,"outsideTempOnHeatingDays":2.87},{"month":4,"outsideTemp":6.91,"heatingDays":30,"degreeDayNum":332,"solarIrradianceKwhM2":131.8,"windSpeedAvg":6.79,"relativeHumidity":77.3,"outsideTempOnHeatingDays":6.9},{"month":5,"outsideTemp":11.51,"heatingDays":29,"degreeDayNum":202,"solarIrradianceKwhM2":171.6,"windSpeedAvg":6.56,"relativeHumidity":76.4,"outsideTempOnHeatingDays":11.24},{"month":6,"outsideTemp":15.51,"heatingDays":25,"degreeDayNum":81,"solarIrradianceKwhM2":174.6,"windSpeedAvg":6.63,"relativeHumidity":76.5,"outsideTempOnHeatingDays":14.73},{"month":7,"outsideTemp":18.29,"heatingDays":16,"degreeDayNum":25,"solarIrradianceKwhM2":170.1,"windSpeedAvg":6.48,"relativeHumidity":77.4,"outsideTempOnHeatingDays":16.39},{"month":8,"outsideTemp":18.49,"heatingDays":13,"degreeDayNum":22,"solarIrradianceKwhM2":141.2,"windSpeedAvg":6.49,"relativeHumidity":76.5,"outsideTempOnHeatingDays":16.29},{"month":9,"outsideTemp":14.72,"heatingDays":26,"degreeDayNum":101,"solarIrradianceKwhM2":90.5,"windSpeedAvg":7.04,"relativeHumidity":78.4,"outsideTempOnHeatingDays":14.23},{"month":10,"outsideTemp":9.87,"heatingDays":31,"degreeDayNum":251,"solarIrradianceKwhM2":51.2,"windSpeedAvg":7.72,"relativeHumidity":81.2,"outsideTempOnHeatingDays":9.87},{"month":11,"outsideTemp":5.37,"heatingDays":30,"degreeDayNum":379,"solarIrradianceKwhM2":22.1,"windSpeedAvg":7.84,"relativeHumidity":85.5,"outsideTempOnHeatingDays":5.37},{"month":12,"outsideTemp":2.02,"heatingDays":31,"degreeDayNum":495,"solarIrradianceKwhM2":13.4,"windSpeedAvg":8.14,"relativeHumidity":85.6,"outsideTempOnHeatingDays":2.02}],"groundTemp1m":9.71,"groundTemp2m":9.71,"solarIrradianceKwhM2Year":1105.1,"windSpeedAvg":7.31,"relativeHumidityAvg":80.2,"suitability":{"score":71,"rating":"good","color":"lime","estimatedScop":4.1,"notes":["Wysokie nasłonecznienie - bardzo dobre warunki dla hybrydy pompa ciepła + PV.","Wysoka średnia prędkość wiatru (7.3 m/s) - większe straty przez infiltrację."]},"_meta":{"source":"OPEN_METEO_ERA5_LAND_1991_2020","sourceLabel":"ERA5-Land Reanalysis (1991-2020)","fetchedAt":"2026-05-19T12:27:11.460Z","attribution":"Weather data by Open-Meteo.com (CC BY 4.0)","legalRef":"PN-B-02403:1982 (climateZone, standardOutsideTemp)","apiVersion":"v1"}}