It has a lot to do with the colors.
The flowers, the leaves, the trees, the grasses. The fallen petals, the opening buds, the pets sniffing.
New York comes to life in April. The smells emerge from the blanket of snow, the neighbors mingle outside coffeeshops, the stores crack their windows and prop open their doors.
Jackets are cast off, shoes become open-toed, sunglasses stay on for much longer.
I found it really hard to get back on the plane.