Wintriness
The Century Dictionary and Cyclopedia
noun.
The character of being wintry: as, the
wintriness
of the climate or the season.
Wiktionary, Creative Commons Attribution/Share-Alike License
noun.
The state or quality of being
wintry
.
Word Usage
"If temperature is any measure of wintriness, it is clear that December has been much colder than average in Washington."