Earlier quoted context omitted.
There's almost no weather you can't bike in, just requires decent clothing and studs like parent mentions. In Calgary Alberta one year I commuted 50 km across the city each way with ebike for an entire year. With decent snow clearing, studded tires there was probably only ten days I didn't want to or couldn't take my bike.
Yesterday it was 94F with humidity around 70%. If I tried to ride to the closest supermarket, that's 10min each way. Great way to get heat stroke.
What you can do in hot conditions is ride an ebike.