Written by Theresa Rose on August 25, 2015

By Harry Hillaker, State Climatologist, Iowa Department of Agriculture & Land Stewardship

Iowa experienced its coolest week since the last week of May and the wettest week since June 2014. Rain fell over the northwest one-half of Iowa from late Sunday (16th) afternoon into Monday (17th) afternoon with torrential rain falling over a wide area from eastern Plymouth County to southwest Kossuth and northwest Humboldt counties. Additional rain fell statewide between Monday afternoon and Tuesday (18th) night with a broad area of one to two inch amounts over the northwest two-thirds of Iowa. Some light rain fell over much of the state on Wednesday (19th). Dry weather prevailed on Thursday, Friday and into Saturday before another round of thunderstorms developed in western Iowa Saturday afternoon and brought rain to all but the far northwest portion of the state. Overall weekly rain totals varied from only 0.21 inches at Fort Madison to 9.12 inches at Cherokee and 8.16 inches at Remsen. The statewide average precipitation was 2.59 inches while normal for the week is 0.93 inches. Despite the recent widespread heavy rains there are a few areas in the state that have been missed, particularly the northeast corner, and could use some rain. Meanwhile, temperatures began the reporting week above normal over all but northwest Iowa on Monday (17th) with the temperature reaching 91 degrees at Donnellson. However, much cooler air moved into northwest Iowa on Monday and across all but far eastern Iowa on Tuesday. Wednesday (19th) and Thursday (20th) were the coolest days with daytime highs of only 61 degrees recorded at both Northwood and Anamosa on Wednesday while Thursday morning lows dipped to 44 degrees at Sheldon, Sibley and Sioux Center. A few areas warmed slightly above normal on Saturday (22nd) before much cooler air again moved into the state on Sunday (23rd) when Northwood saw an afternoon high of only 66 degrees. The week as a whole averaged 4.7 degrees cooler than normal.