The featured timeseries chart is from the USDA-ARS-NSTL flux site showing recent near surface soil temperatures, in metric units even! This plot nicely illustrates the process of thawing, where soil temperatures approach the freezing but take a while to warm above freezing as it takes extra heating to change water phase. Once above freezing, you can see the nice response to solar input on the 12th with temperatures above freezing.

Voting:
Good = 25
Bad = 12