They had to use the McCreary Field House everyday during spring practice because the outdoor fields have been under renovation since late winter. I'm sure that the new outdoor practice fields will both be ready well before the start of fall practice and will be put to good use any day that the weather is nice.
Also, I don't think there is any real value in practicing in bad weather. Practice is about learning assignments, making reads, learning techniques, etc. and not about learning how to run, pass and tackle on a windy, rainy or cold day. On game day the weather is what it is for both teams. I don't think one team gets any advantage from having practiced outside in weather conditions that happen to correspond to the weather conditions that occur on game day. Alabama, Clemson, Oklahoma and Michigan State are good teams because they have good players who have been coached well and not because they are skilled at playing in bad weather conditions.