Coldest months are December and January where temperatures sometimes reach near-zero and subzero levels. They can survive freezing at moderate subzero temperatures by producing a cryoprotectant chemical. The advance covered a day, despite heavy blinding snowstorms and subzero temperatures. Even at subzero temperatures, snowflakes are ephemeral because they sublimate. Plants are not the only organisms capable of withstanding subzero temperatures. He leaves on foot with Pup, pulling a dog sled, in subzero temperatures. Subzero temperatures are very uncommon and only occur once every decade or so. However, they are capable of remaining active even in subzero temperatures when necessary. The room temperature drops to subzero when the laptop suddenly begins to work again. Consequently, organisms cannot necessarily adapt to their subzero environment if the temperature drops abruptly. Many mountainous areas in the north have experienced subzero conditions. "Secale cereale" can thrive in subzero environments. He then gained a new subzero armor and weaponry. The unplaced horses included Subzero, The Phantom and Drum Taps. It introduced subzero sizes for naturally petite women.