In the mid western US, you don't really have the many great months. For the most part, mid December-March are freezing cold with a lot of snow. April-May are prone to sever thunderstorms and lots of tornadoes. June-August are blistering hot with 100% humidity and infested with mosquitoes. The only really enjoyable time is September-mid December, but sometimes it starts getting really cold in November, leaving you with only two good months.
Seattle, on the other hand, usually stays between 40-80 degrees F the year round. We don't get as much rain as people think. The only bad thing is it's overcast around 250 days a year, so if you like your sunshine a lot it might not be the best place. Me, I love overcast days so it fits me like a glove.
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