Samuel Clemens aka Mark Twain said about Missouri, his home state,
If you don't like the weather, stay around for a day or so - it will change.
Heh.
And most people do not realize it, but Missouri has 5 Hardiness sub Zones - 5b - 7b.
My zip code is 5b - less than a mile to the Southwest it is 6a. I live in a well protected area, so I never worry about planting a Zone 6 plant.