I hate bipolar weather

It's so miserable. I feel the temperature outside before getting dressed for school, and its freaking COLD. So obviously I wear pants and a hoodie. So after school gets out, I leave expecting to feel the same cold weather, and I get outside and it hot! Like deathly hot. I start to sweat instantly, and I wish more than anything I would've worn shorts and a T-shirt. This doesn't sound like too big of a deal, but it causes me a lot of difficulty in my life. Why can't the weather just stay relatively the same throughout the day? That's all I ask.