OK, look: you have a low-end Suntour fork with no damping circuits; therefore, no oil. It is a grease-lubed fork; and the grease stiffens in the cold. You are going to find this in most lower-priced replacements too, because lower-end Manitous, most RSTs and a few others - - even if they have rebound-damping circuits - - are grease-lubed forks. As mentioned above, a surer bet is to look for a Marzocchi or some other open- or semi-open oil-bath fork that actually uses fork oil for not only the damping circuits but for keeping the bushings lubed.
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Originally Posted by Mark Twain
"Don't argue with stupid people; they will drag you down to their level and then beat you with experience."