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Winter 2017-2018 Hibernation
The 2017 hibernation period started the first part of November as nights turned cold, but as the weather turned warmer near the end of the month, several turtles emerged and moved to new locations. None of the moves were very far, but hibernation dates had to be adjusted as a result.

Winter started on December 8th as an Arctic blast hit and temperatures plummeted.  The first snow storm of the season dropped 4 inches of fluffy snow and stayed for about a week.  Temperatures really fell sharply during the last half of December and first week in January which was a continuos period of record lows.  The remainder of the winter saw oscillating periods of very warm weather and colder than normal periods.
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Area photo description here
2017 hibernation locations.  Turtle M45, a transient who moved far outside the normal study area, is not shown.

Most of these sites have soil and air temperature loggers installed and some sites also have iButton temperature loggers attached to the lower part of the turtle's carapace.
Hibernation soil, air, and iButton temperature data and charts in Excel format for 22 hibernation sites available here
Here's a good reason to choose a deep stump hole for hibernation, and to remember that location for future hibernation.  When the winter air temerature is -5 degrees F, this turtle experieced temperatures around 35 degrees F.  Turtle M6 hibernates in one of 2 stump holes, only about 20 feet apart, every year.
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