The featured chart is an attempt to determine the relationship between observed July air temperatures and wind directions at 4 PM from the Des Moines Airport. The contour plot is a density field with the red area representing the 90th percentile (most common). Focusing on that area, we see a clear trend for increasing temperatures as winds switch from the SE to SW. The side histograms show the distribution of the observations with the dark green showing the distribution of winds while the temperature is above 90 degrees. Again, the SSW and SW winds are the most frequent when temperatures are the warmest. So what is the moral of the story? Having winds from the SW are an important factor to drive temperatures into the mid and upper 90s.

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Tags:   jul