Last week we had one day when I left at 12:45 there were about 200 Guests in the park. Of course the morning had started out with Thunderstorms and the temperature had just hit 70 at noon and it was overcast.
I do recall one day last winter that we closed the park at noon. We only had 37 Guests, the temperature was only in the mid-40s and the wind was picking up.
Looking at the 10-day forecast I do not see any day that we would be closed or closing early. (If you go to weather.com use a zip code of 32830.)
Of course we will close (at least temporarily) if there are any storms with electrical activity within five miles of the park.
For lots of Guests from UK, Canada and the upper midwest they have no problems with temperatures in the 60s or even 50s. The water in all of the paark, except Shark Reff, is heated into the low 80s.