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Weather and climate data for engineering

Weather files and climate data for any place and any year

Station observations fused with reanalysis and satellite solar, checked hour by hour and delivered as EnergyPlus-ready EPW, DDY and STAT.

Make a weather file Free account: 2 files, no card.
Denver, 2023: daily temperature range Every day of 2023 in Denver from an EPW.tools file: the band spans each day's low to high, the line is the weekly mean. Hottest hour 35.4 °C on Aug 16, coldest -23.8 °C on Feb 23. -20°0°20°40°JanAprJulOct 35.4° Aug 16 -23.8° Feb 23
Denver, 2023, from an EPW.tools file: each day's low to high, and the weekly mean. Any coordinates, any year from 1990.
weather files made
1,000+
countries
70+
accounts
540+
years available
1990 to today
Built from NOAA Meteostat ECMWF ERA5 NASA MERRA-2 NREL NSRDB Copernicus CAMS CMIP6 EURO-CORDEX

A standard TMY for a major airport is free elsewhere. EPW.tools earns its keep when you need a specific year, an exact site with no nearby station, or defensible accuracy (honest comparison, methodology and sources). Works with EnergyPlus, OpenStudio, Ladybug/Honeybee, DesignBuilder, IES VE and SAM.

Built by Carlo Bianchi, PhD, a former U.S. national-laboratory researcher and member of ASHRAE Technical Committee 4.2 (Climatic Information), the committee behind the climatic design data this tool computes. About & publications.