Personally, I don't like sunny days, but I like rainy days. Is this related to a person's psychology and personality?

Yes, you like quiet environment. Rainy days are like when night comes. At this time, people basically stay at home, and home has a warm feeling. They want to be cared for and cared for all the time, and they want to have a warm atmosphere anytime and anywhere! But these are not always available, so I have been looking forward to the arrival of the night, but there is no day, only in the evening, so I like rainy days, giving people the feeling that they can "go home" soon in the evening! This is an expression of expectation to be loved.