Does hershey park close on rainy days?

I'm going up on October 3rd for a semi private day and it's supposed to rain (like a 40% chance). I don't necessarily want to go if rides like farenheit and storm runner is closed. If anyone has been to hershey and it's rained for part of the day, do they open the rides back up? And how much does it have to rain before they close their rides?