Anybody having seasonal changes?

Hi everyone. Over the past week or two I've been gradually reducing my basal rates and my bolus calculations/rate. Previously, in late June, I had increased my basal and bolus rates so I'm wondering if this has anything to do with the seasons, ie beginning and end of summer? I was taking about 15 and a half units basal every day (on a pump) two weeks ago and now I'm down to about 13 and a half, so the change is pretty significant I think. Is anyone else experiencing something similar?