Tools / Weather File Validator

Weather File Validator

Check EPW, TMY2, TMY3, and NSRDB-style CSV structure, required fields, typical-year length (8760/8784 unless you mark a partial file), and obvious quality problems. Download the report.

This checks EPW / TMY2 / TMY3 / NSRDB-style CSV structure, required fields, and obvious data-quality issues. A “valid” or “pass” result means the file looks structurally OK under these checks — not that the weather data is accurate, complete for your project, or approved for any standard or jurisdiction. Always review flagged issues and source documentation yourself.

Auto-detectEPWTMY2TMY3

Changing format re-parses the loaded file immediately. Accepts EPW, TMY2, TMY3, and NSRDB-style CSV.

Get NSRDB / TMY weather data (NREL) · NREL SAM weather data

Drop EPW, TMY2, or TMY3 here, or choose a file

Or paste EPW / TMY2 / TMY3 text

Partial-file override — do not require 8760 / 8784 hours for the typical-year length check. Leave unchecked for a full typical year.

Checks EPW, TMY2, TMY3, and NSRDB-style CSV format, required headers/fields, typical-year length, and obvious quality issues (missing dry-bulb, RH range, stuck values).

Utility only — not a PE stamp, certified weather product, or code-approved calculation. Outputs are estimates from your inputs/files; verify before design, bidding, or compliance use. Terms