In theory when temperatures drop oil will become 'thicker'... all oils will, also the one in your shock and front fork. This will 'stiffen up' the suspension. Normally I would expect the oil would warm up after 'a while' (however long that might be...).

I'm experiencing the same cold as you are (in the Netherlands) and have no issues,but maybe it is because I'm running on a worn out knobby front tire that already has a very poor steering characteristic (push it into a corner, then it will drop in to it, need to compensate ... got used to it)

If you would like to compensate for the thicker oil you should reduce compression and rebound damping.

HJ

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Riding the Mad Mule !! ... no more... went orange...