Generally speaking yes, but my comment was more in regards to the effect of elevation on temperature (as Azelor noted, the mountains are much warmer than the valleys in Siberia and Mongolia during the winter due to the temperature inversion).
As Azelor also hinted at, very cold (sub-arctic) areas tend to have vast marshlands because of permafrost (see
wikipedia), which prevents the water from sinking into the ground (and there's practically no evaporation in a cold climate). Those kinds of climates don't really need a lot of rainfall (in fact, they need barely any) to develop marshlands and/or taiga.
Mongolia is a different case because it's deep inland and has a very warm summer (July temperatures above 30 °C are fairly common). Skadi seems more of a taiga area to me, since it's located between two major bodies of water and bordered by tundra to the north. That is, if you want to follow real-world climate patterns/rules.