Known for extreme temperature swings and "Tornado Alley" activity as cold and warm air masses collide.
The spring season can vary significantly across different regions in the USA. For example: what is spring season in usa
If you want the classic "perfect American spring" experience (flowers, baseball, mild air, green grass), plan your visit for mid-April to mid-May in the Mid-Atlantic region (Washington, D.C., Philadelphia, New York). Known for extreme temperature swings and "Tornado Alley"