This is a subcategory of skyglow (https://en.wikipedia.org/wiki/Skyglow); I’ve come across “snowglow”, for light reflected from snow-covered ground (https://www.sciencemag.org/news/2019/08/light-reflected-fresh-snow-can-outshine-moon) but the article specifically discusses snowglow’s contribution to urban light pollution and interference with astronomical observation—-necessarily implying clear nights.
“Whiteout” overlaps with what I’m looking for, but specifically denotes reduced visibility; I get the impression that a whiteout need not be nocturnal or involve artificial light sources: http://www.awstats.net/whiteout/
“Diffuse reflection” seems to cover it somewhat: https://en.wikipedia.org/wiki/Diffuse_reflection
To repeat: what I have in mind is the reciprocal reflection/diffusion of light from sources within the space between the snowy sky and snowy ground.
“artificial light diffusion on snowy nights”
“diffuse light snow”
“diffuse reflection snow artificial light”