Alright this is what happened:

0800 woke up

0810 looked outside and noticed that it snowed about 30cm

0845 went outside to plow the snow out of the driveway

0850 opened the car and noticed that there was about 3 inches of snow on the passenger seat and floor of the car

I checked if the rubber seals were gone but they were all there. The same ones as on the driver side atleast. Where could of the snow got in from? Anyone else in canada had that happened too?

 

was your window or sun roof open a crack?

Or your HVAC vent left in the 'outside air' position? (yes, it can blow in through HVAC if winds are strong enough)

or, being in Ontario, you might have a rust hole through a part of your car that it's blowing in through.

 

Was your door unlocked? Quite possible somebody opened the door, the first place snow goes is on the seat and floor.

 

ummm......have you had problems with rain getting in too?

 

I agree, sounds like someone could have opened your door.
It happens sometimes.

 

roof closed ... windows closed ... door closed ... if there was someone i would of seen foot prints in the snow but there wasn't any i'm going to have to check the air position. No i've never had any water go in the car or anything before