Phoenix, where it is

In Phoenix, the capital and the largest city of Arizona, the climate is subtropical desert, very mild in winter and very hot in summer. The city is located at the 33rd parallel, 350 meters (1,150 feet) above sea level, and 250 km (155 miles) away from the Gulf of California, from where humid air masses can arrive in summer, which can bring some rain: we are in fact in the area of the Sonoran Desert.
The average temperature ranges between 13 °C (55 °F) in December to 35 °C (95 °F) in July. Here are the average temperatures.
Phoenix - Average temperatures
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Min (°C)891216212529282518127
Max (°C)202225303540414038312419
Min (°F)464854617077848277645445
Max (°F)6872778695104106104100887566

In the United States, Phoenix is renowned for being a very hot city: in fact, it is the hottest of the big American cities. In one year, there are 169 days with more than 32 °C (89.5 °F), but above all, the temperatures can exceed 40 °C (104 °F) with a certain ease from May to September, and practically every year, 45 °C (113 °F) are exceeded on the hottest days. In June 1990, 50 °C (122 °F) were reached.
Moreover, while in June it's still dry, by July the humidity increases slightly, aggravating the sensation of heat. In fact, the average humidity goes from 19% in June, to 31% in July, to 36% in August and September.
Although winter is generally pleasantly mild, it can sometimes get a little cold, and there can be days with lows around freezing, or even slightly below, and highs of around 10 °C (50 °F).
A bit of wind can blow all year round, but especially in spring, when clashes between air masses are more frequent, and still more in summer, when even sandstorms can occur.

Phoenix

Precipitation is definitely scarce, since it amounts to just 200 millimeters (8 inches) per year. The wettest periods are December-March, when disturbances may pass, and July-August, when, as mentioned, humid air can come from the Gulf of California and can trigger thunderstorms. The driest period is from April to June, when it rains very rarely. Here is the average rainfall.
Phoenix - Average precipitation
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Prec.(mm)232325730272516151722204
Prec.(in)0.90.910.30.101.110.60.60.70.98
Days44421045323437

The amount of sunshine in Phoenix is excellent all year round: the sky is almost always clear, and with 3,870 sunshine hours per year, it is one of the sunniest cities in the world. The sunniest period is the driest, from April to June, when the sun shines 90% of the time or more. Here is the average of the sunshine hours per day.
Phoenix - Sunshine
MonthJanFebMarAprMayJunJulAugSepOctNovDec
Hours89101213141212111098

When to go


The best time to visit Phoenix is from November to March. Winter, from December to February, is generally a mild and sunny season, although it can sometimes rain, or it can get a bit cold (especially in December and January). You can therefore choose the months of March and November.