Run in December

I just went for a run outside in December in shorts and a t-shirt. I couldn't do that in New York! It was 70° today. I love it! It's supposed to be in the upper 50's up to mid 60's all week. Again, that almost never happens in New York. It's strange because I froze during my 5K run a couple of weeks ago. The weather here has been cold then warm then freezing then warm. Make up my mind! At least it hasn't snowed yet!