The Weather Files May 2026

Speed and direction to estimate natural ventilation and infiltration.

A standard weather file stores hourly information for a full year, including: Dry-bulb and dew-point temperatures. The Weather Files

Reliable weather data is available through several major repositories: Speed and direction to estimate natural ventilation and

Direct and diffuse solar intensity, critical for calculating heat gain. The Weather Files

These contain data from a specific, real-world year. They are essential for calibrating building models against actual utility bills or performance data. 2. Core Data Components

Tools like the WeatherShift™ tool use climate model projections to adjust historical files for future decades (e.g., 2050 or 2080).

As the climate shifts, historical data (TMY) may become less representative of a building's future lifespan. Engineers now use to "future-proof" designs.