Pack or skip
Beanie for Tucson in December
Verdict
Pack it
Lows around 38°F — a beanie doubles the perceived warmth for zero grams.
Why
Tucson in December averages highs of 63°F, lows of 38°F, 4 rainy days.
That climate means a beanie earns its space in the bag. Lows around 38°F — a beanie doubles the perceived warmth for zero grams.