Pack or skip
Thermal underwear for Washington DC in January
Verdict
Pack it
Lows around 28°F — thermals are the difference between a walk and a march.
Why
Washington DC in January averages highs of 43°F, lows of 28°F, 9 rainy days.
That climate means thermal underwear earns its space in the bag. Lows around 28°F — thermals are the difference between a walk and a march.