One factor not covered is moisture.

BBC: Who, What, Why: What is wind chill factor?

But what sets its ConsERV technology apart, aside from a more compact and flexible form factor, is that independent testing has shown it delivers higher rates of moisture transmission, translating into better energy efficiency.

FORBES: Magazine Article

But Dr Peter Stott, a leading climate scientist at the UK Met Office, says that since the 1970s the amount of moisture in the atmosphere over the oceans has risen by 4%, a potentially important factor.

BBC: Why, oh why, does it keep raining?