Data specifications

Technical specs of our Historical and TMY data

Data Specifications


  • Global Horizontal Irradiance (GHI, W/m2)
  • Direct Normal Irradiance (DNI, W/m2)
  • Direct (Beam) Horizontal Irradiance (EBH, W/m2)
  • Diffuse Horizontal Irradiance (DIF, DHI, W/m2)
  • Cloud Opacity (%)
  • Temperature (TEMP, °C)
  • Solar Zenith angle (°)
  • Solar Azimuth angle (°)
  • Wind Speed (WS, m/s)
  • Wind Direction (WD, °)
  • Relative Humidity (RH, %)
  • Surface Pressure (AP, hPa)
  • Precipitable Water (PWAT, kg/m2)
  • Snow Depth (SWDE, cm)
  • Dew Point (DWPT, °C)

Spatial coverage

Global, except for ocean and polar regions

Spatial resolution of satellite data used

1 - 2 km

Time granularity

Period Mean: 5, 10, 15, 20,30 or 60 minutes (period mean, labelled with period-end time)

Native Satellite: 5 minute period-mean values, labelled with period-center time (time between values depends on satellite scan history – usually between 5 and 60 minutes)

Database update frequency



January 2007 to 7 days ago (for past 7 days to present time, use our Live data)

File formats

  • Solcast standard CSV
  • TMY3
  • SAM
  • PVsyst

Access method

Data can be ordered and downloaded via the Solcast API Toolkit.

Download wait time

Typically 1 to 9 minutes

Test now, free

Get free historical data credits when you sign up, so you can try our data for yourself. You can download data automatically within around 1 to 9 minutes of submitting your request.