>I measured the temperature to be about 218 F. Is it risky to use this
for overwintering feed?

The easy to remember 1 - 2 - 3 - 4 - 5  fondant/bee fudge recipe
suggested for spring/emergency feeding is:

1 pound/pint water heated to 234º F which has had 5 pounds of sugar
stirred into it.  Much higher than the 218º F. Personally, I’d not
worry about  it.

Regards,
Dick Allen

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