I'm not sure what is used for a spring in those shocks, but what your describing is textbook elastomer or MCU springs...which are affected by temperature. When it gets cold, they pretty much get rock hard.
There are 3 kinds: air, coil, and MCU.
Air "spring" works with air in a chamber.
Coil... are just a metallic coil inside the fork.
MCU is a "rubber" material that compresses. As noted by mtnbiker72, it gets stiffer in cold weather.
MCU and Elastomer sprung forks are all but obsolete except for maybe the really cheap forks (which sadly, an RST Gila is). So if you stick to the name brands such as RockShox, Marzocchi, Fox, or Manitou you'll be riding either an air sprung or coil sprung fork. The spring in these are generally not too affected by temperature...although the oil in the dampeners can be in really cold weather.
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