Periglacial environments can be cold wet or cold dry, generally alpine environments are wetter due to relief, and arctic environments are dry (arid).

There is an active layer that thaws during summer, and also a transient layer between the two. The active layer is supra-permafrost, and is seasonally frozen. Usually seasonally frozen ground penetrates t the permafrost table, however if there is unfrozen ground twixt them, it is Talik. http://www.scienceinschool.org/repository/images/issue22permafrost9_xl.jpg

Generally glacial landscapes are higher energy that periglacial, changing climate over time changes the prominent landscape type and therefore the energy in the system.
Proglacial environment: forms along ice boundaries and are periglacial in nature.
Paraglacial environment: the environment is in disequilibrium between states/climate types. i.e. glacial -> temperate.
French defined boundary conditions as less than 3 degrees air temperature (the same condition must be met for soilufluction and patterned ground, further categorization includes mean annual air temp less than -2 where frost action dominates.
Tricart and Cailleux defined three periglacial environment types:

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University finals GEOG3004 (1 - Intro) Note on Lecture 1 - Introduction, created by samflint93 on 02/10/2013.