> Here's a chart of average relative humidity of cities throughout the US (https://www1.ncdc.noaa.gov/pub/data/ccd-data/relhum18.dat https://www1.ncdc.noaa.gov/

> Here's a chart of average relative humidity of cities throughout the US (https://www1.ncdc.noaa.gov/pub/data/ccd-data/relhum18.dat https://www1.ncdc.noaa.gov/pub/data/ccd-data/relhum18.dat). From 1950 to 2018.But you'll notice in the Arizona cities, plenty times of the year, the average humidity is between 40%-60%. I think you're reading that wrong. Doesn't M stand for "Max" and A for "Average"? If so, the average in southern Arizona cities is 15%-30% and in northern Arizona cities 30%-50% (which matches my experience).