By Harry Hillaker, State Climatologist, Iowa Department of Agriculture & Land Stewardship
The past reporting week began with warm and dry conditions. High temperatures were mostly in the 70s on Monday, Tuesday and Wednesday with a maximum of 82 degrees at Keosauqua, Little Sioux and Sioux City on Wednesday (3rd). Much cooler air dominated the state for the rest of the week. Saturday (6th) was the coldest day in most areas with highs only in the 40s. A hard freeze was recorded over most of Iowa over the weekend with Sibley reporting a low of 21 degrees on Friday (5th) morning, Battle Creek 12 degrees on Saturday (6th) morning and Spencer 13 degrees on Sunday (7th) morning. Temperatures for the week as a whole averaged 7.1 degrees below normal. Battle Creek’s Saturday low temperature tied for the lowest temperature for so early in the season in Iowa (also 12 degrees at Humboldt on Oct. 6, 1935). The only rain event of the week came on Thursday and was confined to about the southeast one-half of Iowa. Keokuk Airport reported the most rain with 0.68 inches. The statewide average precipitation was 0.05 inches while normal for the week is 0.68 inches. This was the 20th week of the past 22 with below normal rainfall.