Thanks for the explanation!

In the northern hemisphere, the shortest days of the year are around the 21 of december, but the coldest month is usually february, when days are already getting longer and the sun reaching higher in the sky as it nears spring. Does this delay between amount of sunlight and amount of heat mean that there is a cumulative effect of sun radiation on the atmosphere over the span of many weeks, as opposed to it being warmed or cooled instantly by the amount of sun radiation coming from the space? Why doesn't that acummulated radiation/heat disperse through the globe, considering it's summer at the same time at the opposite hemisphere?