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 TMY | Extended TMY | Available on request |
P50 | P50, P75, P90, P95 | Pxx | |
Coverage | Global, except for ocean and polar regions | ||
Spatial resolution of satellite data | 1-2 km | ||
Time granularity | 60 minute | ||
Timespan of database used to generate TMY | January 2007 to 7 days ago | ||
Parameters |
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Files provided |
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Time zone |
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Database update frequency | Daily (recent months are considered in TMY scenario) | ||
Access method | Data can be ordered and downloaded via the Solcast API Toolkit | ||
Download wait time | Typically 1 to 9 minutes |
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