It's a perfect day
It's in the mid 70s
Humidity at sixty percent

It's a perfect day
Not a cloud in the sky and I
Could say Without fear of dissent
It's a picture postcard perfect kind of
A summer afternoon

It's a perfect day
Ah, ah, ah
It's a perfect day
Yeah

It's a perfect day
The birds are singin'
And the bees are pollinatin' the flowers

It's a perfect day
The fauna is fawning
And frolicking away all the hours
It's a picture postcard perfect kind of
Summer afternoon

It's a perfect day
Ah, ah, ah
It's a perfect day
It's a perfect day
It's a perfect day!

http://phineasandferb.wikia.com/wiki/Perfect_Day