March and April are the windiest months of the year. Truth is, we probably never get out of our windy season in the northern plains, but statistically this is the windiest time of year. March 15 through April 15 is generally the windiest 30-day period of the year. Meaning, we are in the middle of the windiest time of the year in a, yes, windy part of the country. Spring and autumns being the transitional seasons tend to have the highest wind speed, but spring tends to be a bit windier because of the higher sun angle this time of year in comparison to autumn. That higher sun angle meaning stronger thermals which enhance the wind speed.