Would you direct me to the source of this information? I'd like to read more about. also the OP was concerned about driving his winter tires during cold weather that may turn warm for a day or so.. It's not like he would be driving this tire in dead of summer.
Driving a winter tire in summer is what a lot of people do but its a little dangerous and cost money, more in the end. Now if its winter and you all of a sudden get a warm day or two no biggy. But, driving a winter tire in summer will accelerate the wear much faster... It also affects steering and braking negatively too. Tirerack, DiscountTire, Bigotire, Americas tire, les schwab all say not to run winter tires in the "summer season" its different for each region.
Winter tires are designed to flex/grab more in cold weather hence why most just call it a "softer rubber compound" VS a summer tire it built to handle the heat, friction, and forces of warm weather driving so they do not flex/grab as well in cold weather. Then you have all season which is commonly the middle ground. OK performance in cold/warm weather. Then trucks/suvs have the sizes needed for more All terrain/mud terrain tires.
A relatively new class of tire has come out called All weather tires. They are similar to an all terrain with winter rating. The rubber softens up in cold weather for better grip in ice/snow but firms up in warm weather for handling, better wear. Many feel the All weather will eventually take over the winter/all season in certain regions because having two sets of tires is just not an options for some folks.