My spring and summer basal's can drop as low as .800 but usually not lower than .700, but my winter ones can go up considerably. This is my second winter with my pump and I had been doing pretty good until this last couple of weeks not needing to increase them. Currently I'm running as high as 1.15 an hour. It may be the cannula's as well too. I don't really have any scientific method of adjusting my basals, but I just kinda start inching it up, till I find something that works. Of course you are talking to someone whose been diabetic, almost 28 years, I kinda fly by the seat of my pants. If you are newly diagnosed you might not be quite at the comfort level yet.