I had been going really strong from the first week of September all the way through the end of March. Being in Florida, we don’t see the winter drop off like the rest of the country. Our temps drop down to about 5°C over night and then back to 13-18°C in the middle of the day. On the flip of that though, in the Summer here we are at 36-38°C at 1200-1600 and then you add on humidity so thick it is like inhaling Vegemite, you end up with a heat index/feels like temp(in the shade) of 43-49°C. It knocks down my productivity pretty fast. I would guess that your climate is about the same? I would think most of the Southern US states are about the same temperature wise, though New Mexico and Arizona are super hot and dry in the summer.