That is fully expected. Model 3s we're seeing a 30% reduction in range in the cold, IFIRC.
The battery produces less power, there is more rolling resistance on snow, and the heat consumes a lot of power. Your range will come back (mostly) in the summer.
Batteries do degrade over time, so it may not be 100% back, but your car doesn't sound atypical. Hopefully the winter range meets your driving needs. If so, don't worry and enjoy the car!
2011 Silver SV, purchased 2018, lives in Missouri (previously in CA)
LeafSpy Pro + BAFX Products OBDII dongle
Battery swap 2019/04/24 (87% SOH, 12 bar)