The solar zenith angle has a strong effect, so latitude matters.
An interesting read from your home state: https://uvb.nrel.colostate.edu/UVB/publications/UV-Primer.pdf Bob NW8L (at 5300 ft asl, Sandoval County, NM, #37 in the ranking) On Tue, 6 Nov 2018, Dauer, Edward wrote:
Interesting to sort the list by UV flux data. Doing that for the 3107 entries, my QTH in Teller County, Colorado, at an average elevation of about 8500' and with 247 sunny days per year according to the tourist adsr, is number 511. 53 of the 67 counties in Florida rank above it. I would not have guessed that . . . Ted, KN1CBR
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