There is a reason that winter tires are only designed to be used during the winter months. The tires tend to wear out quickly when they are exposed to heat. Summer and all-season tires are made out of a different type of rubber that is designed to handle warmer conditions. You will also end up paying more for fuel if you drive on winter tires during the summer months.
The rolling resistance on winter tires is much higher. Your vehicle will use a lot more fuel. That is why you will likely find yourself having to go to the pump frequently. Additionally, using winter tires during the winter months can put your safety at risk. It will be harder for you to make turns. It will also take a lot longer for you to stop.