Big difference in max and min. We have serious thunder storms in the summer. Lightning and hail and normally in the late afternoon. I have seen man hole covers in the road being forced up by the water. Normally humidity leads to some sort of storm. Amazed your weather has been so good for so long. Global warming maybe changing weather patterns. I don't know. the weather is definitely changing though. Cape Town went down to no water recently. Dams were empty.
I read somewhere that global warming is making the polar jet stream meander and slow down causing one type of weather system to get stuck in one place for a longer time. That means longer heat waves or periods of rain.