Cold temperatures cause facets (incredibly angular, low density snow grains) to form.
Why do we care about facets? Becuase facets cause snow pack instability and avalanches.
1ºC per 10cms of snow is the threshold for temperature gradient needed to grow facets.
Cold temperatures and facets are characteristic of the intercontinental and continental snow packs of Utah, Colorado, Wyoming, Montana, New Mexico, Idaho, and the Canadian Rockies. If you ski or ride these regions, you need to know about facets.
Anywhere with cold temps can grow facets. California’s snow pack currently has facets due to recent cold temperatures.