Personally, I love to run on a gray day with light drizzle. To me, that's preferable to a hot summer day or a brisk morning. Not so wet that the ground gets muddy and traction suffers, but a nice cooling day which is just unpleasant enough to keep some people inside and some cars off the road. I feel like when the roads are emptier I can spend more time thinking on my run. Anyone else a huge fan of running in the rain?