Every thousand feet you gain in elevation is equivalent to being 300 miles farther north. The tiny town of Portal is where we began our ride. Portal is about 1,600 miles from Great Falls, Mont.

Lastly, the latitude and altitude of a location. The UV wavelengths, or in simpler terms, the strength of the sun at the surface, typically range from 100 to 400 nanometers.

Sonya K. Auer, David I. King. Ecological and life-history traits explain recent boundary shifts in elevation and latitude of western North American songbirds. Global Ecology and Biogeography, 2014 ...

Letter Published: 27 July 1946 Distribution of Wet Bulb Potential Temperature in Latitude and Altitude C. W. B. NORMAND & K. NAGABHUSHANA RAO Nature 158, 128 (1946) Cite this article ...