Permission to modify and redistribute is explicitly granted for all purposes. I do not provide any guarantee as to the correctness of the decoding, and do not accept any responsibility.

This HTML page contains a JavaScript decoder for the international METAR standard code for reporting of weather observations.

I think the decoder is quite complete, according to the unofficial specifications I have checked against, but I could not thoroughly test every single field. Should you find any errors, please do not hesitate to contact me.

Use this page for anything you want, with or without modifications. If you improve it, I would like to hear from you!

Manuel Heras (manuel@heras-gilsanz.com) August 2002

Dec 2006: Parser for \ contributed by Ricardo Fernandez

Feb 2007: Correction to support \Mar 2007: Parser for \ contributed by Ricardo Fernandez -->

METAR Decoder

Type in an International METAR report (US-specific format is not supported) in the text area below, and press \decoded to human-readable form.

If you want to try with a real-time METAR, perhaps you want to use the

This page makes heavy use of Javascript;

if it does not seem to work for you, check that your web browser supports Javascript 1.2 and that it is enabled.

(c) 2002-2007 I do not provide any guarantee as to the correctness of the decoding, and do not accept any responsibility.

Dec 2006: Parsing of QNH in inches of Mercury by Ricardo Fernández.

Feb 2007: Correction to support \Mar 2007: Parsing of Statute Miles visibility by Ricardo Fernández