The Five Seasons In Arizona

Simple.
Verdin nibbles on an orange.

Did you know that southern Arizona has five  distinct seasons? 
They are:
Winter (December & January & February):
Mostly sunny, mild days, with intermittent storms with wind, rain, and cool to cold temperatures; February is often warm and dry, more spring-like. 

Spring (From early to late February through April):
Mild temperatures; little rain; often windy; main flowering season for annuals, shrubs and trees; winter annuals may bloom in February in warm, wet years. 

Foresummer drought, aka Dry Summer (May & June):
High temperatures; very low humidity; no rain in most years; May is very warm and often windy; June is hot and usually calm. There is little biological activity except for the flowering and fruiting of saguaro. Nearly every living thing is in basic survival mode until the rains arrive.
 
Summer monsoon or summer rainy season (early July to mid- September):
The most dramatic weather event of the region - the often abrupt arrival of the summer rains. A tropical air mass adds humidity and moderates June's extreme temperatures; frequent thunderstorms.
 
Autumn (October & November):
Warm temperatures; low humidity; little rain; few species in flower, but beginning of growing season for winter annuals in the rare years with enough rain. Late summer and Autumn occasionally receive heavy rains from the remains of Pacific hurricanes/tropical storms.