It is about 10-15 degrees cooler these past two mornings. I have no had the heat on, so I figured when just starting the car it should still have the initial charge for 20 miles. I didn't realize the battery won't show the full 20 mile radius due to a tad colder temps (it was 63 this morning) because of the cooler temperatures. I figured maybe once I started driving and the heat was on, it would drop down. However, that was not the case yesterday or today. I will still sitting in the garage and the initial range came up as 15 miles. To me 63 degrees isn't that cold where the battery would function so much lower.