Historic data / AMY

Meteonorm also delivers Historic data, which consists of actual time series of meteorological parameters for specific time periods and locations. In contrast to TMY data, which represents a typical meteorological year, Historic data provides an actual meteorological year (AMY).

This AMY is based on actual time series data for the following key parameters:

• Global Horizontal Irradiance (GHI)
• temperature
• dew point temperature
• precipitation
• wind speed These actual time series are then enriched with all other parameters available in Meteonorm.

Global irradiance data between 65°S and 65°N is derived from satellite observations. For areas outside this latitude range, ERA5 reanalysis data is used. Temperature, humidity, precipitation and wind speed values are based on ERA5.

The irradiation dataset is generated by combining the Heliosat method — applied to visible satellite channels — with a multichannel retrieval technique for snow cover detection using near-infrared and infrared channels.

To correct biases and reduce uncertainty, a statistical regression approach incorporating ground-based measurements is employed.

Historic data can be accessed via the /climate/historic endpoint.