Pack or skip
Sunscreen for Washington DC in January
Verdict
Pack it
Sun still finds you at 43°F — UV doesn't care about temperature.
Why
Washington DC in January averages highs of 43°F, lows of 28°F, 6 rainy days.
That climate means sunscreen earns its space in the bag. Sun still finds you at 43°F — UV doesn't care about temperature.