The featured chart presents the daily climatology for Ames of daily average mixing ratio (a measure of humidity) along with this year's values and a departure from a simple average (bottom chart). The month of September certainly sticks out for the elevated humidity levels with nearly the entire month well above average. October has seen less humid levels, but that is also a function of the cooler air temperatures that have been prevailed for the month. Cooler air has a lower water holding capacity, which the main driver for the yearly signal shown with the climatology.

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