Snowstorms are when GPS are least likely to work accurately if at all.

As it works through ground base stations it shouldnt be a problem,I would think it would be ground interference, ie, transmissions that would cause more problems.

but the maps would have to be very accurate as it uses maps as well,best at the moment sticking to lane assist radar and GPS

Even with the best maps things go wrong.

New high voltage cable to support 500/1000 new homes passed

along the foot of my road.

They dug up the pavement to put in the cable & burst the watermain.

the drawings showed the watermain in the road.

However the watermain was under the pavement - they narrowed the road and widened the pavement - sometime after the drawings!

60 foot high water spout - water board & electrical contractor f'ing & blinding at each other. Happy days!