I wouldn't worry about snow. If it is bad then cars won't get through. In July it is more than likely going to be cold, ok for half an hour, but if you are doing 3+ hours in close to freezing temps you will suffer. Ice is the other issue, especially when it has warmed up enough to make you feel confident then you hit a shaded patch.
But I'd say definitely do it, especially if you have no time constraints. You can sit out any really bad weather and to be honest, there are only a handful of days a year where you wouldn't get your bike out. You'd be pissed if you flew down to 20 degrees, which can happen.
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