The featured map is from an IEM Autoplot tool that allows comparison between two period of years. In this case, we are comparing the difference in average number of days per March with the daily high temperature above 32 degrees. The two 30 year periods compared are the most recent 30 years against the 30 years prior to that. The plot does not show much difference between the two periods with all values around +/- one day or less. You can generate more maps like this and pick the metric of your choice!

Voting:
Good = 7
Bad = 3
Abstain = 1