I took the opportunity to remove my bottom super and mouseguards 2 weeks ago when temp was 15c. I will wait awhile before supering on top as they will need to keep warm still for a bit longer.
Perhaps wait until a bit warmer before you take lower super away. I found that there were no stores left but quite a few bees inside which meant that I had to shake them into the brood box. Slightly disruptive so better on a warmish day