Standard Meteorological Weather File Downloads

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Standard Weather Files for Building & Solar Modeling

Instant, certified meteorological datasets formatted for EnergyPlus, PVsyst, Carrier HAP, Trane TRACE, HelioScope, and NREL SAM.

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WMO ID: -- Coordinates: -- Elevation: -- Period: Multi-Decadal TMY

Mean Annual Temp

Max Summer Peak

Min Winter Low

Annual Solar GHI

Peak Gust Speed

Choose Weather Data Format

Select your target simulation format below. Hover over any info icon to see supported software and details.

EnergyPlus Weather Format .epw FREE

Standard 8-header hourly meteorological dataset (35 variables).

TMY3 / TMYx Comma-Separated Values .csv FREE

NREL standard 68-column dataset with paired data source & uncertainty flags.

NREL System Advisor Model Solar CSV .csv FREE

Streamlined 15-variable format tailored for solar PV, battery, and CSP modeling.

ASHRAE Design Day Conditions .ddy FREE

30-year 99.6% heating & 0.4% cooling extreme conditions for HVAC equipment sizing.

Daysim / Radiance Daylighting Format .wea FREE

Mid-hour solar irradiance format for dynamic daylight autonomy (sDA / ASE) modeling.

Legacy TMY2 ASCII File .tm2 FREE

Fixed-width 126-byte ASCII format for legacy DOE-2, eQUEST, and TRNSYS engines.

Custom Hourly Bin Weather Tables .xlsx / .csv PREMIUM

Configurable 1°F / 5°F temperature bins with coincident wet-bulb & schedule filtering.

Certified Meteorological Provenance & Data Quality Assurance

All datasets adhere to World Meteorological Organization (WMO No. 100) standards, NOAA/NCEI Integrated Surface Database ground observations, and ECMWF ERA5 solar irradiance reanalysis. Full scientific specifications, conversion physics, and agency citations are published in our technical reference guide.

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