My commute is 13 miles in each direction. Central Indiana temperature range is 0F to 105F, plus heat index and minus windchill. I don't keep detailed weather records but probably only 1-5 days per year at 5F or below (wind chill would make that range appear lower), worse for me is the headwind as somehow it seems to switch seasonally and I generally get a strong headwind on the way into work during the colder months, which is an agonizing leg-eater, but staying warm is more related to dressing to suit conditions so it's been a few years since I arrived at work really too cold.
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Longbikes Slipstream