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See ice fog.
[From Western Shoshone pakenappeh : pakena-, fog (akin to Cahuilla páxiš, fog, both Shoshone and Cahuilla from earlier *pa-ki-, perhaps ultimately from Proto-Uto-Aztecan *pā-, water) + -ppeh, suffix for stative nouns or nouns considered to be in an inalterable state.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Physical Geography) an icy winter fog
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014