The best months to visit United States are April and October. See monthly temperatures, rainfall and rain days (1991–2020 averages) to plan your trip.
Average daytime high and monthly rainfall in United States: January 4°C / 79mm; February 15°C / 74mm; March 18°C / 99mm; April 22°C / 87mm; May 27°C / 101mm; June 32°C / 91mm; July 32°C / 111mm; August 33°C / 98mm; September 29°C / 117mm; October 26°C / 89mm; November 16°C / 77mm; December 11°C / 91mm.