Spring War will happen rain or shine or snow or whatever else might happen.
If anyone * about it being too cold all I can say is bring blankets or sit by a fire. If the night is too cold stay at a hotel in Effingham which is 15 minutes away or sleep in your car.
If you think it is too crappy think about having an event in a sandstorm in New Mexico in June when it's 102 degrees. That is much worse.
So sayeth the Sorcia.