It all depends on the altitude. The low desert areas average about 43-67 degrees in the winter and 81-106, 110-115 isn't uncommon, in the summer, while your upland areas, like Flagstaff, average 14-41 degrees in the winter, 50-81 in the summer.
When you get to about 4000', you can expect snow in the winter, but it's just a few times a year and usually melts within 24 hours or less.
The low humidity state wide is a plus. The only time it gets up there is during the monsoon season, traditionally with rain starting around July 4th and continuing through maybe the first week in September. The afternoon rains and daily building cloud cover will drop the temps by 10-20 degrees. The humidity runs between 50-65%, whereas the rest of the year, it runs between 7-15%.
My 2nd ex and I ran a landscaping business in Scottsdale for 5 years. We covered the general Phoenix area and the only time we stopped working was when the temps got over 115 during the day. This was in June, the hottest and driest month of the year State wide. The whole "dry heat" is really true.
The creepy crawlies..........they have their issue with altitude and temperature too! Throw in the availability of water, from a sprinkler system, and the population will flourish. When people move here from out of State, many want to replicate the environment they lived in before. Providing grass, foliage, and water to desert dwelling species is a virtual 24 hour bed and breakfast. You can really see that down in the Phoenix area, where they are getting more encounters with Native wildlife, reptiles, and insects in populated areas, mainly scorpions, centipedes, rattlesnakes, javelina, coyotes, and bob cats. Up in the higher elevations, most of the Native species stay away from developed areas, they can find what they need away from humans. (Unless you put food out for your dogs or cats, and then you just might draw in a few 4 legged critters)
Black Widows are common all over the State. There are non chemical sprays you can use twice a year to control them, but they stay away from areas of activity.usually not an issue.
Tarantulas are NOT dangerous. They are actually pretty cool and you won't really catch sight of them until late July and August.
The best way to avoid the "critters" is just becoming one with your environment. Don't try to change the eco system.
This link has info on the average temps and precipitation for Page:
http://cdo.ncdc.noaa.gov/climatenormals/clim20/az/026180.pdf
I think you might really find it a comfortable climate to live in.
The Navajo Nation, Glen Canyon Dam, Lake Powell, and the Colorado River are all nearby.
The Indians are incredible, their culture would probably fascinate you! They are entirely different from the Indians in the East. The year I spent working on the rez was probably the most unique experience I ever had.
No Daylight Savings Time...don't need to mess with all your clocks twice a year!:floorlaugh: