From the ArcaMax Publishing, Vocabulary Newsletter:
http://www.arcamax.com/news/vocabulary/s-371083-414917
favonian \fuh-VOH-nee-uhn\ (adjective) - Pertaining to the west wind;
soft; mild; gentle.
"The sun had a misty glare, the favonian wind blew steadily from the
same quarter, and the streets were dismal with uncol- lected refuse."
-- Vincent McHugh, 'I Am Thinking of My Darling'
Favonian is derived from Latin Favonius, "the west wind."