is this true or a tale?

[Czech-it-Out Graphics]

Olds, when the humidity is up you need to lean the motor out. More water in the Air = less oxygen in the air, therefore you need LESS fuel in the motor. Cool temps are usually associated with low humidity so believe it or not with cold temps u may have to richen your motor due to an increase in the oxygen levels in the air which means you need MORE fuel in your motor to mix well with MORE air

hope that helps