[request] average temperature in Japan in 1945 following the nuclear strikes?

Me and my gf have lately been joking around when playing hoi4 saying

"I'm going to raise the average temperature by 2000 degrees when I drop two suns on Japan"

It got me thinking, how much did the two nuclear strikes that happened on Hiroshima and Nagasaki ACTUALLY raise the overall average temperature in Japan in 1945?