Iowa Preliminary Weather Summary
By: Dr. Justin Glisan, State Climatologist - 10/10/2018
The first week of October had unsettled conditions statewide with above average rainfall and generally below average temperatures. Precipitation totals were up to four inches above normal with higher accumulations in eastern Iowa. Temperatures were cooler than expected, except in the southeastern corner. Monday (1st) was a rainy day for Iowa's northern two-thirds as a low pressure system moved into the state. Rainfall totals into Tuesday (2nd) morning were above one inch for over 40 stations with Dubuque (Dubuque County) reporting 2.31 inches, 2.21 inches above normal. Average highs ranged from the 50s in the northwest with gradual warming into the lower 70s towards the southeast. Showers and thunderstorms continued across northern parts of Iowa during the day on Wednesday (3rd).
Statewide highs were in the upper 70s and low 80s. Late in the evening a cold front moved through Iowa, bringing rain to the southeast. Accumulations were under an inch with Newton (Jasper County) observing the highest total of 0.81 inches. With the cold front exiting Iowa early Thursday, highs cooled into the 50s. Multiple rounds of showers and thunderstorms moved through Iowa Friday (5th) through Sunday (7th), especially across the southern and eastern counties. Heavy rain was observed in eastern Iowa Friday evening into early Saturday (6th); Williamsburg (Iowa County) reported 3.65 inches, 3.55 inches above average. Stations from Marion to Scott counties recorded accumulations above two inches. Measurable rainfall was reported across much of Iowa on Sunday. Weekend highs ranged from the upper 40s in the north to lower 60s in the south. De Soto (Harrison County) observed the week's warmest temperature of 93 degrees on the 2nd. Estherville (Emmet County) reported the week's low of 30 degrees on the 4th. Statewide average precipitation was around 1.61 inches, 0.93 inches above the average of 0.68 inches.