Starter bubbles but did not double
I have a 5-month old 100% hydration starter that I bake with weekly. I store about 2 ounces in the fridge. I refresh the starter on Friday night (1 part KA AP flour to 1 part water by weight) to bake on Saturday morning. In 8-12 hours, the starter usually doubles, has big frothy bubbles and a bright, fruity smell. This week the starter has bubbles, but did not double. It is about 15 degrees cooler this weekend (high eighties for the past month and now low seventies) Is the starter still any good? Will it need a few feeds to readjust to the new temperature?
All input is welcome and thanks in advance,