Water temperatures inside and outside an oak tree hibernaculum used by spotted turtles in central Pennsylvania

Water temperatures inside a swamp white oak tree hibernaculum used by
spotted turtles, and at the bottom of the pool outside the tree, recorded
every 30 minutes from December 2020 through mid–March 2021 with a Hobo
U12-008 data logger and TMC temperature sensors (Onset Computer, Pocasset,
MA). Sensors were placed at the bottom of the pool inside the tree
(verified with the endoscopic camera) and at the bottom of the center of
the pool outside the tree.