Not as an immediate response to the question 'how are you?', as the person is asking how you are, not how the day is, but it can lead to that. For example -
'How are you?'
'I'm fine thanks. You?'
'Great weather today. I always feel good when the sun is shining'
Something like that. 'How are you' can be a conversation starter, or just a polite inquiry that ends with 'I'm fine/good'; etc, depending on the situation.