Why are a lot of people moving to Florida these days? It rains all the time there in the summer, which confuses me as to why it is the Sunshine State.

Hold the phone. What? 

I've lived in Florida for over twenty five years, I can assure you it doesn't rain here "all the time" at ANY time of year. We often go many days with nary a cloud, particularly in summer.

To the point of your question, people are fleeing the lousy weather, crappy roads, congested traffic, high cost of living, and heavy tax burdens of the northern states. Real estate in Florida is cheap. There is no state income tax here, no tax on retirement savings and (despite what you say) warm SUNSHINE YEAR 'ROUND.

I believe what you are refering to are the semi-common but brief cloydbursts that iccure in some areas due to the tropical/coastal climate.  It obviously doesnt occure everywhere in Florida or every day.  If it did it would be more like Oregon and i am pretty sure it is not.  Oregon has far more rainy days than sunny.  I am very certain Florida is totally the opposite