Dry Sept -vs- snowfall amount:
I investigated the 8 years mentioned by LWX in the AFD today regarding driest Septembers. (5 Driest Septembers BWI, DCA, IAD)
Using BWI annual snowfall records, (normal 20.1 inches), I checked the following winters of each year for either normal, or above normal; rounding to the nearest inch. So basically, if a winter was 20" or higher it makes the winner's circle. (2005 wouldn't have made it without the rounding to 20, but eh, close enough)
So, I was a bit surprised that only 2007, at 9" was below normal. Here's the years and following winter snowfall (Balto snow data):
1884 - 31"
1906 - 31"
1967 - 23"
1977 - 34"
1978 - 43"
2005 - 20"
2007 - 9"
2014 - 29"
avg = 27.5
The 1977 was only at DCA; 1978 and 2014 only at IAD. Otherwise pretty good mix.
Hope we don't see another 2007/8 winter; or worse.