One thing for certain, although it's not desert where I live, the air is drier year round than Ontario or British Columbia:

An open packet of pita bread...becomes perfect dry pita chips. You don't get mouldy bread.

I was back in Toronto for a few days last week. I was reminded of their thick tree cover.

I haven't yet figured out fall here in Alberta.....the temperature change during the day can be a difference of 20 degrees C or in Farenheit, it can be 40 degrees F in early morning and over 80 degrees F in afternoon.