good luck trying to find something. we made our reservations months ago.
i'm pretty sure state park electric/water sites ($20-25) would probably be gone by now but check anyway as people cancel regularly.
some private probably have openings and they would have full hook-ups but cost more.
last january the temps were usually 50-60s during the day, some 70s and one 80.
at night 40-50s. we ran our electric heater almost non-stop. one night actually got into the upper 30s with rain/sleet and the people were panicking big time. closing schools and businesses, etc. for us from wisconsin it was a warm winter day.