I am a scientist (ha ha) and my research shows that human fertility declines in periods of excessive climate heat.
I have observed and documented that more pregnancies occur in brutal winters, where close proximity to persons, occasioned by the need for warmth, and by extension; if exposed to a warm body of the opposite sex such heating up leads to copulation and population.
It’s true. I swear!
I believe you ... and based on limited experience — despite my age — I agree!