Quad Cities, IA/IL

Weather Forecast Office

June and July Heat/Heavy Rain Summary

Overview

A prolonged period of heat and heavy rain was seen beginning the middle of June through the entire month of July. There were several stretches of oppressive heat with afternoon heat indices greater than 100 degrees at times. There were many days with dewpoints greater than 65 degrees indicative of humid conditions. In fact, Moline, Dubuque, and Cedar Rapids saw their most consecutive days of 65+ degree dewpoints since 1997 with over 40 days in a row!

This year has been unusually humid compared to normal and as a result, there were several days of heavy rain from the middle of June through the month of July. Many hometowns saw over 9 inches of rain for the month of July, which some seeing their wettest July on record. This allowed rises on area rivers, with minor to moderate flooding occurring.

Map showing all of the National Weather Service Watches, Warnings, and Advisories that were in effect the afternoon of Monday, July 28th. The magenta color shows where the Extreme Heat Warnings were in effect on this date.


June Mean Dew Point (graph from PRISM)	July Mean Dew Point (graph from PRISM)	Dew Point Infographic

Heat Index
Stats / Records
Rain

Heat

Peak Heat Index June 21st	Peak Heat Index June 22nd	Peak Heat Index June 23rd	Peak Heat Index June 25th

Peak Heat Index June 26th	Peak Heat Index July 3rd	Peak Heat Index July 10th	Peak Heat Index July 11th

Peak Heat Index July 22nd	Peak Heat Index July 23rd	Peak Heat Index July 27th	Peak Heat Index July 28th

Peak Heat Index July 28th

Stats / Records

Dew Point Records / Notable Streaks

Moline, IL had 3 stretches of 10 days or more of consecutive days with at least one hour each day of a 70 degree dew point or higher between June 20th and July 30th. The 13 days in a row ending on July 30th is the 3rd longest consecutive stretch since 1997.

June 20-30th = 11 days, July 3rd-12th = 10 days, July 18th-30th = 13 days

Moline, IL had 26 days with at least one hour of a +70 degree dew point during the month of July. This is the most # of days since the ASOS-era (1997 onward).

Moline, IL had the 3rd most # of hours of +70 degree dew points for the month of July (368 hrs). The only 2 years that had more hours were 1999 (424 hrs) and 2011 (416 hrs).

Moline, IL had its longest stretch of consecutive days (49) with at least one hour each day of a 65 degree dew point or higher since 1997.

Cedar Rapids, IA had 3 stretches of 10 days or more of consecutive days with at least one hour each day of a 70 degree dew point or higher between June 20th and July 30th. The 14 days in a row ending on July 16th is the 5th longest consecutive stretch since 1997.

June 20-30th = 11 days, July 3rd-16th = 14 days, July 18th-30th = 13 days

Cedar Rapids, IA had 27 days with at least one hour of a +70 degree dew point during the month of July. This is the most # of days since the ASOS-era (1997 onward).

Cedar Rapids, IA had the most # of hours of +70 degree dew points for the month of July (440 hrs) since 1997.

Cedar Rapids, IA had its longest stretch of consecutive days (41) with at least one hour each day of a 65 degree dew point or higher since 1997.

Dubuque, IA had 2 stretches of 10 days or more of consecutive days with at least one hour each day of a 70 degree dew point or higher between June 20th and July 30th. The 12 days in a row ending on July 30th is the 4th longest consecutive stretch since 1997.

June 20-30th = 11 days, July 19th-30th = 12 days

Dubuque, IA had 24 days with at least one hour of a +70 degree dew point during the month of July. This is the most # of days since the ASOS-era (1997 onward).

Dubuque, IA had the 3rd most # of hours of +70 degree dew points for the month of July (298 hrs). The only 2 years that had more hours were 1999 (391 hrs) and 2011 (345 hrs).

Dubuque, IA had its longest stretch of consecutive days (46) with at least one hour each day of a 65 degree dew point or higher since 1997.

Environment

Heavy Rain

Widespread rainfall totals over 9 inches were seen across much of the forecast area and the state of Iowa during the month of July. It was the 5th wettest July in Burlington (8.80") and in Moline (9.31"). Dubuque saw its 9th wettest July on record (8.30"). In addition, several Cooperative weather observers had their wettest July and are listed below.

Site	Amount	Period of Record
Bellevue Lock and Dam 12	11.42"	1937 - Current
Donnellson, IA	14.52"	1938 - Current
Illinois City Lock and Dam 16	13.41"	1940 - Current
Manchester, IA	12.01"	1921 - Current
Monticello, IA	8.63"	1896 - Current

July Precipitation Percent of Normal

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