Regardless of whether you think that people are causing global warming or if you think that the earth is simply warming up like it does every few hundred thousand years, most people do believe that overall, the weather is getting warmer year-round.
The latest evidence of this is substantially warmer weather in February across many Northern states, including Minnesota, Wisconsin, Illinois, Indiana, and Michigan.
The average February high temperature in Michigan is 32 degrees, yet we had a day that hit 70 degrees in February! Of course, it snowed a couple days later — it is Michigan after all where the weather is known to change quickly, regardless of the time of year (something to do with being surrounded by the Great Lakes)!