The monsoon season occurs towards the end of summer. In July or August, the dew point rises dramatically for a brief period. During this time, the air contains large amounts of water vapor. Dew points as high as 81°F (27 °C) have been recorded during the Phoenix monsoon season. This hot moisture brings lightning, thunderstorms, wind, and torrential, if usually brief, downpours. It is rare for tornadoes and hurricanes to occur in Arizona, but there are records of both occurring.

However, the northern third of Arizona is a plateau at significantly higher altitudes than the lower desert, and has an appreciably cooler climate, with cold winters and mild summers. Extreme cold temperatures are not unknown; cold air systems from the northern states and Canada occasionally push into the state, bringing temperatures below 0 °F (−18 °C) to the higher parts of the state. Indicative of the variation in climate.

Arizona Climate

Due to its large area and variations in elevation, the state has a wide variety of localized climate conditions. In the lower elevations, the climate is primarily desert, with mild winters and hot summers. Typically, from late fall to early spring, the weather is mild, averaging a minimum of 60 degrees Fahrenheit (15 °C). November through February are the coldest months with temperatures typically ranging from 40–75 °F (4–24 °C), although occasional frosts are not uncommon. About midway through February, the temperatures start to rise again with warm days, and cool breezy nights. The summer months of May through July bring a dry heat ranging from 90–120 °F (32–48 °C), with occasional high temperatures exceeding 125 °F (52 °C) having been observed in the desert area.

Due to the primarily dry climate, large temperature swings often occur between day and night in less developed areas of the desert. The swings can be as large as 50 °F (28 °C) in the summer months. In the state's urban centers, the effects of local warming result in much higher measured nighttime lows than in the recent past. Arizona has an average annual rainfall of 12.7 inches (323 mm), which comes during two rainy seasons, with cold fronts coming from the Pacific Ocean during the winter and a monsoon in the summer.

Average Minimum/Maximum Temperatures

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Arizona is the state which has both the metropolitan area with the most days over 100 °F (37.8 °C) (Phoenix), and the metropolitan area in the lower 48 states with nearly the most days with a low temperature below freezing (Flagstaff).