Pack or skip
Thermal underwear for Toronto in December
Verdict
Pack it
Lows around 21°F — thermals are the difference between a walk and a march.
Why
Toronto in December averages highs of 32°F, lows of 21°F, 14 rainy days.
That climate means thermal underwear earns its space in the bag. Lows around 21°F — thermals are the difference between a walk and a march.