Pack or skip
Beanie for Hilo in December
Verdict
Skip it
Lows near 62°F — no scenario where you'll want one.
Why
Hilo in December averages highs of 79°F, lows of 62°F, 22 rainy days.
That climate means a beanie isn't pulling its weight. Lows near 62°F — no scenario where you'll want one.