Here are the average high and low-temperature departures from normal for August, showing how the daytime highs were close to normal while the nighttime temperatures were 3 to 5 degrees above normal thanks to the high humidity. (MRCC)

elow are the rainfall totals and departures from normal for July-August. Almost the entire state is dark green or blue on the left panel, meaning rainfall was in the range of 15 to 25 inches. The rainfall departures, right panel, were almost all green, indicating that rainfall was above normal for almost the entire state, except for small portions of ... (MRCC)

Here are the average high and low-temperature departures from normal for August, showing how the daytime highs were close to normal while the nighttime temperatures were 3 to 5 degrees above normal thanks to the high humidity. (MRCC)

elow are the rainfall totals and departures from normal for July-August. Almost the entire state is dark green or blue on the left panel, meaning rainfall was in the range of 15 to 25 inches. The rainfall departures, right panel, were almost all green, indicating that rainfall was above normal for almost the entire state, except for small portions of ... (MRCC)

The dewpoint temperature is the temperature you would have to cool the air for condensation or dew to form. It is one of my favorite ways of measuring humidity because it is an absolute number. Relative humidity is a terrible measure, IMO, because it is relative to the air temperature as well as the water content. For example, the other morning we experienced 100% humidity with low-lying fog. The air temperature was 70 degrees and the dewpoint temperature was 70 degrees. (PRISM)

The dewpoint temperature is the temperature you would have to cool the air for condensation or dew to form. It is one of my favorite ways of measuring humidity because it is an absolute number. Relative humidity is a terrible measure, IMO, because it is relative to the air temperature as well as the water content. For example, the other morning we experienced 100% humidity with low-lying fog. The air temperature was 70 degrees and the dewpoint temperature was 70 degrees. (PRISM)

Below are the maps of the average daily precipitable water and departures from normal for August. The units are a bit obtuse: kg per meters squared, which converts directly to millimeters of water. On an average day in Illinois, we had 35 to 45 millimeters (1.4 to 1.8 inches) of precipitable water, which was about 4 to 8 millimeters (.2 to .3 inches) more than normal. That is per day and works out to be about 10-15 percent extra moisture in Illinois for passing thunderstorms to tap…

Below are the maps of the average daily precipitable water and departures from normal for August. The units are a bit obtuse: kg per meters squared, which converts directly to millimeters of water. On an average day in Illinois, we had 35 to 45 millimeters (1.4 to 1.8 inches) of precipitable water, which was about 4 to 8 millimeters (.2 to .3 inches) more than normal. That is per day and works out to be about 10-15 percent extra moisture in Illinois for passing thunderstorms to tap…

Record-Wettest August in Illinois -- The statewide average rainfall for August was 6.89 inches, 3.30 inches above normal and the wettest August on record, according to Illinois State Climatologist Jim Angel, Illinois State Water Survey, University of Illinois. (MRCC)

The rains in September have been widespread across the state with heavier amounts of 3 to 5 inches east of St. Louis and across central Illinois (blue shading). (MRCC)

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