It was so cold that . . .
The two ingredients required to produce snow are moisture and cold. Snow doesn't form unless the atmospheric temperature is at or below freezing. If the ground temperature is warmer than freezing, the snow will melt as it falls. If ground temp is low enough, the snow will stick. So while it can obviously be too warm to snow, it never really gets too cold to snow. Snow can occur at extremely low temperatures, but typically doesn't, because super-cold air tends to be dry. Temperature also effects the type of snow. Snow that falls when temps are close to freezing typically holds more moisture, making it heavier and wetter. As temperatures drop, moisture level usually does too, making the snow lighter and fluffier. While it never gets too cold to snow, snow does become a lot less likely as temperatures drop to 0°F or below. Here's what our friends at the National Snow and Ice Data Center have to say about it: https://nsidc.org/learn/parts-cryosphere/snow/science-snow
We apologize for the confusion. They are actually saying similar things. The key is that, as the "10 Myths About the Cold" starts out saying, if you are not wearing any protective winter clothing to keep you warm, you will lose about 10 percent body heat through your head, somewhat proportional to surface area. However, if one is wearing protective clothing on all parts of the body except the head, the head is the most likely place where heat can escape. That's where the "50 to 70 percent of body heat is lost through the top of your head, but only if the rest of your body is covered up" comes in, and why the "10 Myths" article indicates in general that if you are bundled up, you lose more of your body heat (than the usual 10 percent) through the top of an uncovered head.
Hope this helps!
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