In spite of what your calendar says, for climatologists spring begins on March 1. If you are interested in why we use March 1 instead of the astronomical date, which this year is March 20, you can read about it in this blog post from the Illinois State Climatologist, Jim Angel, at https://climateillinois.wordpress.com/2015/02/23/will-spring-ever-get-here-yes-it-will/
Besides, I know it is spring since I found the first dandelion of the year in my lawn today!