Each day I do pretty much the same amount of driving in my '17 Volt. The past few days it has been fairly cold here in Delaware with temps in the 20s and low 30s. Yesterday it was 34 degrees, I started my 20 mile round-trip with 44 miles on the GOM, heat on 74/auto/eco and returned home with 24 EV miles remaining.
Today it warmed up to 55(!) degrees. I did the same trip starting with 44 on the GOM again, this time no climate - fan only and when I returned home, I had 36 miles remaining e.g. a 20 mile drive only took 8 miles off the expected range.
It's truly amazing how much the ambient temperature and climate affect the range.