This week I have not been feeling well and decided to use this as my inspiration. I am still learning when to bring a sweater or not. Therefore, I bring you Sweater Weather.
If your city is below 70 Degrees F, it will tell you to bring a sweater:
If you are lucky enough to be in the warmth, it will tell you to leave it:
Similar ideas to this are Swacket and IsTheLTrainFucked.