Same here, it was a Saturday in June iirc when I rode in the pouring rain, it was so wet there was more water in the queue line than the river on Nemesis, and this was just a few weeks after the Smiler crash.
I also rode Stealth and Swarm in a hail storm at Thorpe in mid February with two inches of snow on the ground a few years back, all they did with Stealth was close off the front row, just to give riders a bit of protection from pebble dash.
At some point you just have to bite the bullet and run trains around the track to clear the snow/ice otherwise punters are going to start asking if other parks can and do run their rides in the same conditions, what is different about yours that prevents you from doing so?