[ uhn-see-zuh-nl ]
/ ʌnˈsi zə nl /
not characteristic or typical of a particular season; unseasonable: unseasonal April snows.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for unseasonal
A fuzzy caterpillar, driven by some unseasonal urge, started crawling up the log on which they were sitting.The Black Fawn|James Arthur Kjelgaard