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Dude the humidity is definitely over 10-15%. That would be seriously dehydrating and also unbearable. I think you mean the humidity is around 40%

It can vary depending on where in the state you are. The average humidity in Denver is 37% year-round, but in Boulder it apparently averages 0%.

That has to be an error. Even in deep winter ice rapidly sublimates when the vapor pressure of water is low

I think you must be right - currently, they are experiencing 13% humidity. Compared to Denver, that is still kind of suprising. https://www.wunderground.com/weather/us/co/boulder/80301

It's easy enough to confirm. You can go to weather.gov and get current conditions anywhere in the US.

Currently 14% humidity in Boulder, CO.