Pack or skip
Beanie for Boston in December
Verdict
Pack it
Lows around 28°F — a beanie doubles the perceived warmth for zero grams.
Why
Boston in December averages highs of 42°F, lows of 28°F, 12 rainy days.
That climate means a beanie earns its space in the bag. Lows around 28°F — a beanie doubles the perceived warmth for zero grams.