Sources of EnergyPlus Hourly Weather Data

All of the hourly weather data that comes with DesignBuilder is supplied by DOE from:

But with the year changed to 2002 as described in Add new hourly weather data.

Many of these weather files are composite files from multiple years. Each month has been selected to be representative of that month for the period of record. Data is representative of the normal patterns for that month and is not intended to be the average. The selection of months is usually based on a weighting of temperature, humidity, wind, and solar. There are some variations among the weighting, most are similar to the TMY2 done in the US in the 1990s:

https://rredc.nrel.gov/solar/pubs/tmy2/

You can find the details of the file format in the AuxiliaryPrograms EnergyPlus document.

Other Sources

Other sources of hourly weather data and associated tools are listed below.

International sources

Climate.OneBuilding - service established in 2015 as an unfunded project by Linda Lawrie and Dru Crawley. See: https://climate.onebuilding.org/
White Box Technologies - typical year and historical year weather files created from weather reports of over 10,000 official weather stations around the world. See https://weather.whiteboxtechnologies.com/
Meteonorm - a software application that can generate synthetic hourly weather data in epw format for a wide range of locations. See https://meteonorm.com/

National sources

UK - CIBSE TRY, DSY and future climate scenario data is available from the DesignBuilder CIBSE Weather Data webpage.
Germany - DWD, TRY 2010 weather data for Germany can be downloaded free of charge from the Europe page on the https://climate.onebuilding.org website.
Australia and new Zealand - NATHers, Latest hourly weather data for Australia and New Zealand can be downloaded from NATHers at no cost. The link depends on your browser. Copy the links below into the address bar of your browser.
- Internet Explorer: ftp://rNatHERS:MDkflWeZ@ftp.niwa.co.nz/ftp/NatHERS
- Chrome/Firefox: ftp://rNatHERS:MDkflWeZ@ftp.niwa.co.nz
Portugal - LNEG, Download a free spreadsheet which can generate hourly weather data for the various Portuguese regions. See: https://www.lneg.pt/servicos/328/2263/.

Weather data editor/translator

Elements is a free, open-source, cross-platform software tool for creating and editing custom weather files for building energy modelling. See: https://bigladdersoftware.com/projects/elements/