When it drizzles or snows. Dress warmly, but not too much, and venture out on foot. After a good walk, enjoy a vin chaud.
Here are the rest of the lyrics...
'Every time I look down on, this timeless town
Whether blue or gray be her skies
Whether loud be her cheers or whether soft be her tears
More and more do I realize that
I love Paris in the spring time
I love Paris in the fall
I love Paris in the summer when it sizzles
I love Paris in the winter when it drizzles
I love Paris every moment
Every moment of the year
I love Paris
Why, oh, why do I love Paris?
Because my love is here'