The featured chart is an aridity chart showing the combination of temperature and precipitation departure for the month of July expressed in units of standard deviation from average. The total so far for this July is shown on the chart as a red dot and is nearly the same value as 1947! There have been other IEM daily features this year showing 2013 trending like 1947. Extreme dots on this chart are labelled and 1993 certainly stands out (the great flood year). A simple fit is made through this plot showing the inverse relationship as below average temperature is correlated with above average precipitation. This July is a bit unique in the regard of being one of the most extreme in quadrant III (below average temperature and below average precipitation).

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Tags:   aridity