When to visit New York?
April-May: spring, cherry blossoms in Central Park, 15-22C. Great compromise.
September-October: Indian summer, 18-25C, blue skies, foliage. The best window per guidebooks.
December: magical (Rockefeller ice rink, Bloomingdale's windows, Bryant Park market) but very cold (-2/+3C) and expensive. Book 4 months ahead of Christmas.
July-August: 28-33C with 80% humidity. Many locals leave for the Hamptons, hotels -25%.
January-February: cheapest (hotels from EUR 90 at Times Square) but -5C and snowstorms.