When is Monsoon season in the Southwest?

[davidsargee_imp]

Hi guys,

Planning a "bucket list" trip through New Mexico and Arizona this spring, wondering if any of the AZ riders can clue me in on "Monsoon" season and when it is. Obviously want to avoid that.

Preliminary planning is the first week of April for my trip. What is the weather generally like that time of year? I was in AZ late spring in 1996 and all I remember was very hot in the day, cold at night.

Thanks!