Just tell me in advance when we have to switch back to summer clothes

I saw one guy wearing a 🎽 and 🩳, while I was wearing my sweater today. I'm not good at judging the weather for clothing. Last March, my friend asked me, "Why are you wearing a sweatshirt? Don't you feel hot?" I didn't even know it was called a sweatshirt—I just thought of it as a full-sleeved T-shirt. Then, while walking in the park, I called my mother. She asked me why I was walking at 4:45 and I hadn't considered that; it was just my usual time for walking. I also have a hard time dealing with the AC. I'm always like—is it really hot, or is it just all in my mind?