It was a pretty brutal May up in Ohio weather wise but we have had a week of cooler weather which is nice.
I wanted to add one more tip for when the weather is warm. I don't carry anything when I run but in the heat on long runs I need to rehydrate and maybe even take a GU. I place a water bottle and GU packet in my mail box and do a course that brings me back around my house. I might stop once, twice, or even three times once I am in marathon training and doing 18-20 mile long runs.
Also, if you have a park near you with a drinking fountain you can do an out and back past in and get in two water breaks. I have one about 2 miles from my house next to a paved all purpose trail and it comes in handy.
I love a run in the summer rain provided it isn't too hard. Once you have to run through a lot of standing water your shoes get pretty heavy and that isn't great on the leg muscles.
Good luck everyone.