{
  "schema_version": "1.0",
  "generated_at": "2026-08-04T18:53:38.758601Z",
  "location": {
    "city_id": "vienna",
    "city": "Vienna",
    "country_code": "AT",
    "country": "Austria",
    "latitude": 48.2082,
    "longitude": 16.3738,
    "timezone": "Europe/Vienna"
  },
  "reference_system": {
    "installedKwp": 10,
    "orientation": "S",
    "tiltDeg": 35,
    "systemLossPct": 14
  },
  "tomorrow_forecast": {
    "cityId": "vienna",
    "name": "Vienna",
    "lat": 48.2082,
    "lon": 16.3738,
    "timezone": "Europe/Vienna",
    "featured": true,
    "targetDate": "2026-08-05",
    "expectedKwh": 53.7,
    "lowKwh": 46.4,
    "highKwh": 55.5,
    "bestWindowStart": "2026-08-05T12:00:00+02:00",
    "bestWindowEnd": "2026-08-05T16:00:00+02:00",
    "confidence": "high",
    "fetchedAt": "2026-08-04T18:53:38.758601Z",
    "freshness": "fresh",
    "stale": false
  },
  "typical_year": {
    "lat": 48.2082,
    "lon": 16.3738,
    "annualKwh": 11743.47,
    "averageDailyKwh": 32.17,
    "monthly": [
      {
        "month": 1,
        "averageDailyKwh": 15.47,
        "monthlyKwh": 479.44,
        "variabilityKwh": 92.43
      },
      {
        "month": 2,
        "averageDailyKwh": 24.69,
        "monthlyKwh": 691.3,
        "variabilityKwh": 132.49
      },
      {
        "month": 3,
        "averageDailyKwh": 34.14,
        "monthlyKwh": 1058.28,
        "variabilityKwh": 167.67
      },
      {
        "month": 4,
        "averageDailyKwh": 42.98,
        "monthlyKwh": 1289.26,
        "variabilityKwh": 164.55
      },
      {
        "month": 5,
        "averageDailyKwh": 42.43,
        "monthlyKwh": 1315.39,
        "variabilityKwh": 161.41
      },
      {
        "month": 6,
        "averageDailyKwh": 45.01,
        "monthlyKwh": 1350.35,
        "variabilityKwh": 137.15
      },
      {
        "month": 7,
        "averageDailyKwh": 45.16,
        "monthlyKwh": 1399.83,
        "variabilityKwh": 129.43
      },
      {
        "month": 8,
        "averageDailyKwh": 42.01,
        "monthlyKwh": 1302.36,
        "variabilityKwh": 109.56
      },
      {
        "month": 9,
        "averageDailyKwh": 37.52,
        "monthlyKwh": 1125.63,
        "variabilityKwh": 131.39
      },
      {
        "month": 10,
        "averageDailyKwh": 26.75,
        "monthlyKwh": 829.25,
        "variabilityKwh": 159.63
      },
      {
        "month": 11,
        "averageDailyKwh": 16.09,
        "monthlyKwh": 482.74,
        "variabilityKwh": 72.41
      },
      {
        "month": 12,
        "averageDailyKwh": 13.54,
        "monthlyKwh": 419.64,
        "variabilityKwh": 61.92
      }
    ]
  },
  "comparison": {
    "annual_output_rank_in_country_sample": 4,
    "country_city_count": 6,
    "annual_yield_kwh_per_kwp": 1174.347
  },
  "sources": {
    "tomorrow": {
      "weather": {
        "source_id": "OPEN_METEO",
        "name": "Open-Meteo weather forecast",
        "public_display_allowed": true,
        "requires_commercial_license": true,
        "terms_url": "https://open-meteo.com/en/terms",
        "pricing_url": "https://open-meteo.com/en/pricing"
      },
      "model": {
        "source_id": "GRIDPASSPORT_PV_PUBLIC_V1",
        "name": "GridPassport public PV forecast model",
        "description": "Weather-based physical PV estimate with public-safe inputs."
      },
      "attribution": {
        "text": "Weather forecast by Open-Meteo, PV estimate by GridPassport.",
        "transformation_notes": "GridPassport projects irradiance onto the configured PV array and applies public lead-magnet loss assumptions."
      }
    },
    "typical_year": {
      "name": "European Commission Joint Research Centre PVGIS 5.3",
      "url": "https://joint-research-centre.ec.europa.eu/photovoltaic-geographical-information-system-pvgis_en",
      "api": "https://re.jrc.ec.europa.eu/api/v5_3/PVcalc",
      "method": "Monthly average fixed-system output calculated from a multi-year solar radiation and climate series."
    }
  },
  "methodology_url": "https://gridpassport.com/solar-forecast/methodology/"
}