Yes . Mostly in times . How long which type of hand shoes (gloves or mitts ) will keep my hands from locking up . How long before safety glasses or flip down face screens ice up or frost over . How long before I have to get in the truck for a warm up/thaw out break . As my beard is long enough to. The different also in how long before my beard freezes to the lapel of my coat. Above -20°F i will start and run my skidsteer. After having been plugged in yo my Honda EU2200i. I will not even plug it in at 30 below .