Pack or skip
Sun hat for Knoxville in December
Verdict
Skip it
Highs around 51°F — too cool for prolonged sun exposure.
Why
Knoxville in December averages highs of 51°F, lows of 31°F, 10 rainy days.
That climate means a sun hat isn't pulling its weight. Highs around 51°F — too cool for prolonged sun exposure.