The recent cold weather can have lasting environmental effects as illustrated in this news release from the National Weather Service
The preface to the data reads
“Our two week cold snap has had a significant impact on the Gulf water temperatures near our coast. There have been reports of dead or dying green sea turtles and manatees, as well as numerous fish kills up and down the Florida Gulf Coast. The Gulf water temperatures at Clearwater Beach are the lowest since 2001. The sensor became operational in July of 1995. At the time of this article, the water temperature at Clearwater Beach was 55.2 degrees Fahrenheit.”
What this event illustrates is the importance of extreme short-term weather events in terms of long term consequences (in this case animal life), and that this effect is not captured at all by a multi-decadal regional surface temperature trend.