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Solar resource and weather data in time series, typical meteorological year (TMY) and monthly averages

Evaluating the solar resource is crucial for any solar energy investment decision. Project developers, technical consultants, and asset managers require reliable data to make informed, high-value, low-risk decisions.

Not all satellite-derived solar irradiance data is created equal. Solcast has the lowest uncertainty, rapid delivery, multiple formats, and free credit to get you started.

Solcast produces three types of solar resource and weather data: Time series (hourly or finer), Typical Meteorological Year (TMY), and monthly averages. Sign up using the Solcast toolkit and get free credits so you can download some sample data, that’s relevant for you, for free, right now.

Hourly TMY

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 Hourly TMY: Basic and Extended.

  Basic Extended
Global coverage
Includes all file types
Includes all weather parameters
Pxx (probability of exceedance) P50 P50, P75, P90

See details on the Solcast pricing page

Time Series

Time Series data is a historical record of weather data for a specified location. Timeseries of solar radiation and meteorological variables are used during the simulation of energy production of solar power plants to understand expected year-to-year variability, seasonal or intra-day energy generation profile, and for calculation of energy estimates for P90 or other probabilistic scenarios. Recent time-series data can be used to understanding how much solar radiation was reaching a site over previous months, to determine how much energy your solar panels should have generated, or to calibrate equipment, or to update energy models.

Solcast offers two variants of Time Series: Basic and Extended.

  Basic Extended
Global coverage
Entire Solcast record
Ability to purchase individual years
Includes all file types
Indludes all weather parameters
Temporal granularity 60 minutes Native satellite times, 5, 10, 15, 30, or 60 minutes

See details on the Solcast pricing page

Monthly Averages

Solcast provides averaged monthly values of solar radiation data and other weather parameters. Monthly averages provide a high-level overview of the solar resource available at a particular site. They are useful during the early stages of solar site prospecting when a coarse energy estimate is acceptable.

  Monthly Averages
Global coverage
Weather parameters GHI, DHI, TEMP

See details on the Solcast pricing page

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.