Pack or skip
Beanie for San Jose in December
Verdict
Pack it
Lows around 41°F — a beanie doubles the perceived warmth for zero grams.
Why
San Jose in December averages highs of 57°F, lows of 41°F, 8 rainy days.
That climate means a beanie earns its space in the bag. Lows around 41°F — a beanie doubles the perceived warmth for zero grams.