Nestled in the Treasure Valley against the majestic foothills, Boise is part of a thriving metropolitan area of over 660,000 people. Boise has a semi-arid climate with four distinct seasons.

Boise experiences hot and dry summers with highs reaching 100 °F eight days in a typical year and 90 °F on 51 days. Yet because of the aridity, average diurnal temperature variation exceeds 30 °F in summer. Winters are moderately cold, with a December average of 30.7 °F, and lows falling to 0 °F or below on around three nights per year. Snowfall averages 19 inches, but typically falls in bouts of 3 inches or less. Spring and fall are mild. Autumn is brief; spring is gradual. Precipitation is usually infrequent and light, especially so during the summer months. Extremes have ranged from −28 °F on January 16, 1888 to 111 °F, as recently as July 19, 1960; temperatures have reached −25 °F and 110 °F as recently as December 22, 1990 and July 1, 2013, respectively.