Pack or skip
Thermal underwear for Pittsburgh in January
Verdict
Pack it
Lows around 20°F — thermals are the difference between a walk and a march.
Why
Pittsburgh in January averages highs of 34°F, lows of 20°F, 16 rainy days.
That climate means thermal underwear earns its space in the bag. Lows around 20°F — thermals are the difference between a walk and a march.