The best time to visit the USA depends on the region and your interests. Generally, spring (April–June) and fall (September–October) offer pleasant weather nationwide. These months avoid the extremes of summer heat and winter cold, making them ideal for sightseeing, outdoor activities, and exploring cities or national parks.

The hottest city in America is Phoenix, Arizona. In summer, daily temperatures often exceed 105°F, with some days reaching up to 115°F. The city's desert climate means it experiences long, extremely hot summers and very little rainfall, especially from June through September.

The coldest states in the US include Alaska, North Dakota, Minnesota, and Montana. Alaska is by far the coldest, with winter temperatures often dropping below -30°F in interior regions. These states regularly experience freezing conditions, heavy snowfall, and long, harsh winters.

Arizona is the sunniest state in the US, particularly the southern part, including cities like Yuma and Phoenix. Some areas receive over 4,000 hours of sunshine annually. The dry desert climate ensures minimal cloud cover and abundant sunshine nearly year-round.

The sunniest cities in the US include Yuma (AZ), Phoenix (AZ), Las Vegas (NV), and El Paso (TX). Yuma tops the list, averaging over 300 sunny days per year. These cities are known for their arid desert climates, minimal rainfall, and long periods of clear skies.

The rainiest city in the US is Hilo, Hawaii. It receives an average of over 120 inches (3,000 mm) of rainfall annually. The city’s tropical rainforest climate brings frequent, often heavy showers, especially on the windward side of the Big Island where moist ocean air hits the mountains.