“Guys i know the sun is closer to earth is summer and farther in winter”
This is only correct in the Southern hemisphere.
Perihelion, when the earth is closes to the sun is about Jan 3, this is during the winter in the Northern hemisphere.
Apehilion, when the earth is furthest from the sun is July 4 (this year) , this is during the summer in the Northern hemisphere.
“Interestingly, earth 🌎 is furthest away from the sun 😎 in early January, by just 5 mln km than in July. So, their calendar 📆 had indeed solar shoresh. Ironically, they are the furthest distance away from their avoda zara, while Jews are closest to Hashem at Rosh Hashanah!”
Aside for the first sentence being incorrect, I don’t get the Hashem reference, Hashem lives in the sun?
As to the OP’s question I don’t know the answer, the trend towards hotter summers is well as to why, well that is well documented and easy to find