I am so looking forward to winter, and hot summer days being gone.

Winter sucks ***.
The cold, the short daylight hours, the overcast skies, the rain or snow....It all sucks.
In the Summer, you have ALL day to do things. Sure, the heat can be taxing but you can take breaks from it. From inside the house, you can look through the windows and see sunny skies, a huge difference from gloomy cloud cover.
Cold hands where every slip of a wrench hurts worse than ever.
Wet and cold car parts that sit outside.
Cold shop floor, sucking the heat from your feet when walking on it and your body when laying on it.
Paint dries too slow. Bodywork and filler takes longer.
I don't like being soaked in sweat but if you plan your work around the day to be out there away from peak heat times, it is always better than Winter.