I just got back home after almost a month of leaving my 2017 Chevrolet Bolt EV (over 200k miles) in the dead of the northern USA winter. I was shocked even I hopped in it and drove off with over 170 miles of range. The brakes all clunked when I started to move because they sat so long, but the battery had not discharged by much. The range was less than 200 miles because there is a small loss in range, but mostly because winter driving will use more kWh for the same distance.
So thereâ(TM)s a real world data point for you.
BYW, I did run out of power, once, in 2018 when I was pushing the range during an unexpected cold snap. There was supposed to be several percent of charge left in the battery but the car died a mile from my house. There was a software update being released that would have prevented the problem. At the time some cells werenâ(TM)t being balanced correctly which would lead to sudden loss of power when the system thought it still had room to go. Never had a problem since.