IOWA PRELIMINARY WEATHER SUMMARY—for week ending July 28, 2013
By Harry Hillaker, State Climatologist, Iowa Department of Agriculture & Land Stewardship
The past reporting week began with very warm and humid weather on Sunday (July 21) and Monday (July 22). High temperatures were mostly in the 80's on Sunday and the upper 80's to mid-90's on Monday. Temperatures peaked at 95 degrees at Des Moines and Little Sioux on Monday with much cooler weather prevailing for the remainder of the reporting week. The coolest weather arrived over the weekend when daytime highs were mostly in the 60's and overnight lows mostly in the 40's. A few daily record low temperatures were recorded on Saturday (July 27) morning with records set over much of the state on Sunday (July 28) morning. Cresco reported an afternoon high of only 58 degrees on Saturday while Battle Creek in Ida County reported a low of 39 degrees on Sunday morning. This was Iowa's lowest July temperature since July 7, 1984.
Week ending July 28 was Iowa's coolest week since early June--Battle Creek in Ida County reported a low of 39 degrees on Sunday morning July 28
Temperatures for the week as a whole averaged 6.3 degrees below normal. This was Iowa's coolest week in eight weeks (early June). Meanwhile, there were three significant rain events during the reporting week. The first on Sunday (July 21) brought rain to about the southeast one-half of the state with locally heavy rain in south central Iowa where Chariton reported four inches. The second event came on Monday (July 22) evening with the cold frontal passage. Rain was mostly confined to the east one-half of the state with heaviest rains in central Iowa with 3.37 inches at Hampton. Unfortunately this rain event was accompanied by large hail and high winds in many areas with severe storms reported from 25 counties.
Finally, the largest event of the month came on Thursday (July 25) evening with rain falling nearly statewide and heaviest rain falling from north central to east central Iowa with Allison reporting 4.05 inches. Rain totals for the week varied from meager 0.01 inch totals at Rock Rapids and Atlantic to 5.85 inches at Hampton. The statewide average precipitation was 1.02 inches or just above the weekly normal of 0.97 inches.