Pack or skip
Thermal underwear for Denver in January
Verdict
Pack it
Lows around 16°F — thermals are the difference between a walk and a march.
Why
Denver in January averages highs of 45°F, lows of 16°F, 6 rainy days.
That climate means thermal underwear earns its space in the bag. Lows around 16°F — thermals are the difference between a walk and a march.