Technically, the humidity can cause insignificant variations. It isn't extreme, but it could be noticeable. The more humidity, the more water in the air. The more water in the air, the thinner the air is (water particles are more spread out than oxygen/nitrogen/all other gases). So on a very humid day your rig might not cool as well, because it's actually forcing less air through the rad. On a very low humidity day, it might cool better.
But we're probably talking MAYBE .5* C from extreme humidity, to extreme dry.
You also have to factor in that on a Humid day, because your fans are forcing less air, they are probably spinning faster. On a less humid day, they are probably spinning slower, because of the thicker air. So it's probably still pushing the same amount of cooling power through the Rad.
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