September starts bone-dry

Rainfall from September 1 through 10, 2017. Source: Iowa Environmental Mesonet.
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CEDAR RAPIDS, Iowa (KCRG-TV9) -- Rain has been pretty much non-existent across the state so far this month. In Cedar Rapids, the streak of no measurable rain began on August 28. As of Monday, that’s 15 straight days of no rain. If we make it through midnight Saturday night, that would result in 20 straight days. A weak cold front that moves through on Sunday could produce isolated showers and bring an end to the dry stretch. If it ends at 20 days, that would be a tie for the longest streak since 2015. The next-longest streak is 23 days (also in 2015), followed by 27 days in 2010.

At the Eastern Iowa Airport, there have been three years since records began in 1953 with no measurable rain in the first half of September.
That happened in 2009, 1985, and 1976. Before 1953, the long-term climate site in Marion had it happen in 1907 and 1893. The driest September on record at the airport was in 1979, when 0.39” of rain fell. The only year less than that at the Marion location was in 1899 with 0.37”. Last year, by the way, was the seventh-wettest September with 6.92”.

In Dubuque, no measurable rain fell from September 1 through 15 in 2009 and 1893. It happened in Iowa City in 1919 and 1893. In Waterloo, it occurred in 2009, 1950, and 1908.

Dubuque’s driest September was in 1979 when 0.07” was recorded. Iowa City’s was also 1979, with 0.44”. Waterloo’s driest September was in 1953 when 0.42” fell.