Hanh! Two days ago, I found the first woodtick of spring on me. It isn't really spring until someone finds one of the nasty little things.. We haven't heard the Thunders here yet, so in the Indn Way, it isn't really spring yet. But the woodticks have awakened, so the Thunders can't be too far behind.
As for why we call it Spring - I offer as explanation this haiku I wrote a month or so ago:
Tanktops and T's one / Day - Mukluks and parkas the next / Spring - the Dakotas!