Anyone notice harsher ride in the winter?

I've been riding Fox 2.5 coilover up front and 2.0 RR in the back for over a year and it seems each winter the bumps get a bit harsher. Is that due to the cold affecting the oil in the shocks?

 

I am on stock bilsteins but I notice it. My truck rides drastically better when the temps are about 35ish. 35 and below I seem to feel everything in the road.

 

On stock 4600s and notice it also. -20 feels like I’m driving a 1 ton truck with 80 psi in the tires. My fluids physics tell me that it’s due to the oil just being thicker then when warm.