Yep, we run in anything but snow/ice/thunderstorms.

One time we ran with so much wind that we had to double stack all the cones to keep 'em from moving Lotsa missed times at that one, all sorts of stuff blowing through the timer boxes causing false starts & finishes, etc.

Sometimes we have to declare it a non-points/fun-only event if the weather changes a lot during the event... or only count the first x number of runs for everyone... the goal is for everyone to have the same or similar conditions, to keep the results as fair as possible.