Temperature range: 25 to 44 degrees. The fleece temperature ranges from 45 to 64 degrees. 65 to 79 degrees with short sleeves Shorts: 80 degrees or above. Long pants are recommended for temperatures below 80 degrees. It's best to check the temperature outside before you go out in the sun. If it's 40 degrees, you should be able to wear shorts without worrying about heat-related injury. But if it's 100 degrees outside, you should probably avoid exposing skin to the sun altogether. Of course, if you do get sunburn, you will want to drink plenty of water and apply cool compresses to reduce pain and swelling. If you're not used to hot weather, start preparing yourself for warmer days by wearing sunscreen, a hat, and drinking enough water. You could also consider moving your car the last thing before going to sleep, so that it's not right next to the heat source in the morning.