Pack or skip
Beanie for Mexico City in December
Verdict
Pack it
Lows around 45°F — a beanie doubles the perceived warmth for zero grams.
Why
Mexico City in December averages highs of 71°F, lows of 45°F, 3 rainy days.
That climate means a beanie earns its space in the bag. Lows around 45°F — a beanie doubles the perceived warmth for zero grams.