The featured plot is of observed afternoon air temperatures versus the direction of the wind for hourly observations during November back to 1970 when the wind speed was greater than 3 knots from the Des Moines Airport. Confused yet? The black line is a fit by wind direction and the contours are quantile densities, which indicate areas with large number of clustered observations. The plot confirms what we expect with cooler temperatures when the wind is from the Northwest (values 300-360) and warmer when the wind is from the Southwest (values 170-220). The two concentrated areas can be infered from a histogram plot of temperatures observed for 22 Nov with two modes of high temperatures due mostly to these two dominate wind regimes.

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Tags:   nov