It's a well-known fact that blizzard results in more babies.
Blizzard of babies: Maternity wards hopping 9 months after storms
http://www.dailycamera.com/news/2007/sep/24/a-blizzard-of-babies/Hospitals Busy With Blizzard Of Babies
http://www.thedenverchannel.com/news/13986769/detail.html