Answer:
The answer is "March", because that's when the temperatures are moderate across both the Northern and Southern Hemispheres. In January, it's summer in the Southern Hemisphere and winter in the Northern Hemisphere, so it's too hot or too cold in different parts of the world. June and November have similar disparities. March, on the other hand, is a month of moderate temperatures on both hemispheres, with Spring in the Northern Hemisphere and Fall in the Southern Hemisphere.