Pack or skip
Beanie for Arlington in December
Verdict
Pack it
Lows around 38°F — a beanie doubles the perceived warmth for zero grams.
Why
Arlington in December averages highs of 58°F, lows of 38°F, 7 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.