Since I'm a relative newcomer to these parts, I have a slightly different perspective, which is: snow in July is unusual. Everything else is about par for the course. Realizing this has done wonders for my garden.
Today is April 1, the average last frost date in Zone 7B Cary. Usually the weather is gorgeous, and everyone floods the farmers markets and garden centers looking for basil and tomato plants. Not I. Back in April 2007, a rare late frost killed all the peach blossoms and ruined life for many a farmer. That one actually was unusual, but those freak spring hail storms that pour buckets of crushed ice from the sky are not. How quickly we forget.
Normal weather? Now that would be unusual.