# EPW.tools

> EPW.tools makes weather files and climate data for building design and energy simulation, for any point on Earth: EnergyPlus EPW files with DDY design days and STAT summaries for actual years from 1990, typical years (TMY), extreme and heatwave years, short-term forecasts and future climate (CMIP6 scenarios, 2030 to 2100), plus design conditions, Manual J design temperatures, construction weather-day baselines, data-centre free-cooling comparisons and portfolio climate factors. Free to start; paid credit packs and an API licence for software vendors.

Built and validated by EPW.tools against ASHRAE design-condition tables and station observations. Methods and accuracy are documented on the methodology and validation pages.

## Weather files
- [Actual-year (AMY) weather files](https://epw.tools/amy-weather-files): hourly EPW for a specific past year at any coordinates.
- [Typical-year (TMY) weather files](https://epw.tools/tmy-weather-files): typical meteorological years for any site.
- [Future climate weather files](https://epw.tools/future-weather-files): EPW for 2030-2100 under SSP scenarios.
- [DDY and STAT files](https://epw.tools/ddy-stat-files): EnergyPlus design days and climate summaries.
- [TMY vs AMY vs future](https://epw.tools/tmy-vs-amy-vs-future): which file to use for which job.
- [Locations without a weather station](https://epw.tools/no-station-locations): complete files where no station exists.

## Design data and sector tools
- [Design conditions](https://epw.tools/design-conditions): ASHRAE-method heating and cooling design values for any site.
- [Manual J design temperatures by address](https://epw.tools/manual-j-design-temperatures): winter 99 %, summer 1 %, coincident wet bulb, daily range and grains for any US or Canadian address, with pages for 50 US cities.
- [Construction weather days](https://epw.tools/construction-weather-days): normal weather days per month and tracking of actual days for delay claims, worldwide.
- [Data-centre site climate](https://epw.tools/data-center-weather-data): free-cooling hours now and in 2050 and extreme design values for comparing sites.
- [Portfolio climate factors](https://epw.tools/portfolio-climate-risk): degree-days, hot days and ASHRAE climate zone now and in 2050 for up to 100 sites.
- [Greenhouse climate screen](https://epw.tools/greenhouse-climate-data): daily light integral, VPD, heating degree-hours, frost and heat hours for any site.
- [Urban heat and outdoor comfort](https://epw.tools/urban-heat-island-data): heatwaves, day-night temperature range, UTCI comfort and night-ventilation hours.
- [Solar PV weather data](https://epw.tools/solar-pv-weather-data): hourly solar for PV modelling.

## Converters and tools
- [EPW to CSV converter](https://epw.tools/epw-to-csv): free, in the browser; also Excel, JSON and Parquet.
- [EPW to Excel converter](https://epw.tools/epw-to-excel): workbook with hourly data, monthly summary and location.
- [EPW editor](https://epw.tools/epw-editor): change fields in an existing EPW.
- [OpenStudio](https://epw.tools/openstudio-weather-file), [Ladybug / Honeybee](https://epw.tools/ladybug-honeybee-epw), [IES VE](https://epw.tools/iesve-weather-file): using EPW.tools files in each tool.

## For developers
- [API documentation](https://epw.tools/api/docs): REST API with an OpenAPI description.
- [API licence for software vendors](https://epw.tools/api-licensing): prepaid lookup blocks, file blocks, embedding rights.
- MCP server for AI assistants: published on PyPI and the MCP Registry as "epwtools".

## About the data
- [Methodology](https://epw.tools/methodology): how files are built.
- [Validation](https://epw.tools/validation): accuracy against ASHRAE tables and observations.
- [Compare](https://epw.tools/compare): EPW.tools against other weather-file sources.
- [City climate trends](https://epw.tools/climate-cities): how the climate of major cities has changed.