I've always described somewhere as "humid" if the air feels very moist and muggy. So, in the US, I'm thinking of places like Texas (e.g., Houston) and Florida (e.g., Miami). I would consider places like California (e.g., LA) and Colorado (pretty much everywhere) as not humid.
So I thought maybe humidity is the quantifiable metric for this feeling of mugginess. But then I looked up the average monthly humidity for https://weather-and-climate.com/average-monthly-Humidity-perc,Los-Angeles,United-States-of-America vs. https://weather-and-climate.com/average-monthly-Rainfall-Temperature-Sunshine,houston,United-States-of-America, and I was surprised to find that the two were very similar in the summer months, so I'm now confused. I've been to both cities in July, and LA felt very dry, but Houston felt very humid.
San Francisco is somewhere I'd consider to not be humid either, and it seems to have about the same humidity levels as Houston year round: https://weather-and-climate.com/average-monthly-Rainfall-Temperature-Sunshine,San-Francisco,United-States-of-America
So I'm wondering if these humidity measurements is actually representative of the "humid"-ness that I'm feeling when I go to thees places. Should I be looking at other quantifiable metrics?