Pack or skip
Sunscreen for Tucson in December
Verdict
Pack it
Sun still finds you at 63°F — UV doesn't care about temperature.
Why
Tucson in December averages highs of 63°F, lows of 38°F, 4 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 63°F — UV doesn't care about temperature.