Phoenix has a subtropical desert climate, with extremely hot summers and warm winters. The average summer high temperature are some of the hottest of any major city in the United States.  The temperature reaches or exceeds 100°F (38°C) on an average of 110 days during the year, including most days from late May through early September, and highs top 110 °F (43 °C) an average of 18 days during the year. Overnight lows greater than 80 °F (27 °C) occur frequently each summer.  On average, 67 days throughout the year will see the nighttime low at or above 80 °F (27 °C).

Phoenix averages 85% of possible sunshine  and receives scant rainfall, the average annual total at Phoenix Sky Harbor International Airport being 8.3” (210 mm). March is the wettest month of the year (1.07 inches or 27 mm) with June being the driest (0.09 inches or 2 mm). Although thunderstorms are possible at any time of the year, they are most common during the monsoon from July to mid-September as humid air surges in from the Gulf of California. These can bring strong winds, large hail, or rarely, tornadoes. Winter storms moving inland from the Pacific Ocean occasionally produce significant rains but occur infrequently. Fog is rare but can be observed from time to time during the winter months.

Summer Temperature Range: 70°-120°F
Winter Temperature Range: 40°F-70°F
Annual Precipitation: Approximately 7.5 inches a year

Month	Avg Hi	Avg Lo	Avg Precip
Jan	65°F	43°F	0.83 in.
Feb	69°F	47°F	0.77 in.
Mar	74°F	51°F	1.07 in.
Apr	83°F	58°F	0.25 in.
May	92°F	66°F	0.16 in.
Jun	102°F	75°F	0.09 in.
Jul	104°F	81°F	0.99 in.
Aug	102°F	80°F	0.94 in.
Sep	97°F	75°F	0.75 in.
Oct	86°F	63°F	0.79 in.
Nov	73°F	50°F	0.73 in.
Dec	65°F	44°F	0.92 in.

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