WGN's weather expert, Tom Skilling, reported that the month of August is the highest rain fall average based on perennial records. Rainfall is only one of the factors that contributes to playing conditions. Rainfall, higher humidity and hotter temperatures in August combine to impact the turf to a point it gets a bit "puffy" and not as firm and tight as normal. This is an annual occurrence for every golf course in the North portion of the country.
It has rained 9 of the first 21 days of August. When it is warm and humid, it takes 3-4 days of sunshine and windy conditions to dry the course after a rain.
It takes a number of days following rainfalls for the course to dry.