The condition of being gusty; the presence of gusts of wind(noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "gustiness" in a sentence
"Lori's recent publications describe how dunes and dune fields record climate change on Mars, the first evidence for dune migration on another planet, and how atmospheric models can be used to account for wind gustiness and its effects on sand movement."
"Add to that, winds from the northwest around 10-15 mph at times with some afternoon gustiness."
"Typhoon Mirinae, or, Santi as it is named once the storm entered the Philippine Area of Responsibility, is a fast moving storm at 29kph it is forcasr to have winds with gustiness up to 185kph when it makes landfall late friday with an estimated 48 hours to pass over Luzon Island."