TMY

TMY data is frequently used by solar engineers, as a data input to energy system simulations.

A TMY, or Typical Meteorological Year, is a collation of historical weather data for a specified location for a one year period. The dataset is derived from a multi-year time-series specifically selected so that it presents the unique weather phenomena for the location, and provides annual averages that are consistent with long term averages. All TMY files contain exactly 8760 rows of data, each corresponding to an hourly period in an ‘average’, or ‘typical’ year. TMY data is frequently used by solar engineers, as a data input to energy system simulations.

Solcast offers two variants of TMY: Basic (P50 only) and Extended (P50, P75, P90, & P95). See details on the Solcast pricing page

TMY data specifications

Pxx (Probability of exceedance)Basic TMYExtended TMYAvailable on request
P50P50, P75, P90, P95Pxx
CoverageGlobal, except for ocean and polar regions
Spatial resolution of satellite data1-2 km
Time granularity60 minute
Timespan of database used to generate TMYJanuary 2007 to 7 days ago
Parameters
  • Global Horizontal Irradiance (GHI, W/m2)
  • Direct Normal Irradiance (DNI, W/m2)
  • Diffuse Horizontal Irradiance (DIF, DHI, W/m2)
  • Temperature (TEMP, °C)
  • 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)
Files provided
  • Solcast standard CSV
  • PVsyst
  • SAM
  • TMY3
Time zone
  • UTC (default for Solcast)
  • Longitudinal (default for SAM, PVsyst, TMY)
Database update frequencyDaily (recent months are considered in TMY scenario)
Access methodData can be ordered and downloaded via the Solcast API Toolkit
Download wait timeTypically 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.