Nampa's winters are typically cold, with temperatures often dropping below freezing, and occasional dips into single-digit lows. Spring arrives slowly, with temperatures gradually warming up over the course of March and April. May marks a significant shift towards warmer conditions, with average highs consistently above 14°C. Summer is warm to hot, with July being the hottest month, but even then, nighttime temperatures can still dip below 12°C. Autumn brings a return to cooler temperatures, with November marking the start of a gradual cooling trend that continues into December.