June 2010 temperatures averaged 71.4�� or 1.6�� above normal while precipitation totaled 10.45 inches or 5.81 inches above normal.   This ranks as the wettest and 33rd warmest June among 138 years of state records and set the stage for significant river flooding.   The only calendar month to bring more rain to Iowa was July 1993 with a statewide average of 10.50 inches while the previous June record was 10.33 inches in 1947.   The current preliminary total could vary by about plus or minus 0.15 inches when all data becomes available over the next several weeks, thus these rankings could change.  Warmer than normal temperatures were the rule for most of June, as has been the case across Iowa for much of the past four months.   Cooler than normal weather was restricted to only the 7th, 10th, 13th, 15th, 24th and 28th-30th.   Monthly temperature extremes varied from morning lows of 46�� at Sheldon on the 3rd and at Cresco and Elkader on the 29th to an afternoon high of 95�� at Onawa on the 26th.   Heat indices reached as high as 107�� at Des Moines on the 22nd and at Burlington on the 23rd.  As for rainfall, parts of northern and western Iowa came into June needing some rainfall to help newly planted crops develop.   They, and all of the rest of Iowa, got much more than they needed.   Rainfall was very frequent throughout the month.   Des Moines, Johnston and Indianola all reported 22 days with measurable rain during the month.   The following locations set records for most rain in a single calendar month:
City		June 2010 (inches)		Old Record	Period of Record
Indianola		16.86			15.26 in Jun. 1947	123 years
Guthrie Center 	14.92			14.16 in May 1903	113 years
Pella 		        14.71			13.95 in Aug. 2007	  86 years
Hampton 		14.28			14.15 in Sep. 1965	117 years
Ankeny 		14.27			12.87 in Aug. 1993	  60 years
Montezuma         13.56			11.83 in Aug. 1993	  66 years
Cherokee	        13.11			12.90 in Sep. 1926	  91 years
The least rain reported in the state was 5.44 inches at Sidney, but even this amount was 1.22 inches above normal.   Unofficial totals were as high as 20.81 inches near Rowan in Wright County where an amazing total of 3.99 inches fell in one hour on the night of June 22.  Why wasn���t there record flooding with record June rainfall?    Certainly there has been plenty of flooding across Iowa during June and some of it in record territory for a few locations in the state.   However, so far through June, flooding has not been as extensive or severe as in 2008 or 1993.   The reasons for this are several.   First, the past four months have been much warmer (about 6��) than the same months in 1993 and 2008.   The result is that there has been about 20% more evaporation to help dry things between rain events.   Second, spring rainfall averaged near normal in 2010 in contrast to much more precipitation in 1993 and 2008.   Third, with a few local exceptions, the rainfall in June 2010 has been distributed fairly evenly across the state and through the month.   This helps to spread the water out more evenly in space and time so as to reduce the magnitude of the flood crests.   (Explanation provided by Iowa State Climatologist Harry Hillaker.)  During the first two weeks of the month, repeated thunderstorm activity rolled across the state.  The central and south was hit especially hard and is where the greatest flooding occurred.  At this point, many areas have experienced a significant period of flooding and farm fields remain unplanted.  Heavy rainfall once again pushed many rivers of central and southern Iowa several feet above flood stage.  Flooding downstream of the Red Rock Reservoir resulted in major flooding in the Ottumwa area.  Evacuations were required.  Three hundred residents of a mobile home park wre evatuated near Ottumwa.  The last two times this park had to be evacuated were during the flooding periods of 2008 and 1993.

Flood in DECATUR, IOWA
From 14-JUN-10 04:13:00 to 15-JUN-10 17:30:00 (CST-6)
Location: GRAND RIVER
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WARREN, IOWA
From 12-JUN-10 07:38:00 to 17-JUN-10 13:12:00 (CST-6)
Location: CHURCHVILLE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WAYNE, IOWA
From 14-JUN-10 06:40:00 to 19-JUN-10 14:03:00 (CST-6)
Location: CONFIDENCE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in MARION, IOWA
From 14-JUN-10 06:54:00 to 15-JUN-10 01:53:00 (CST-6)
Location: BUSSEY
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WARREN, IOWA
From 14-JUN-10 09:55:00 to 14-JUN-10 21:26:00 (CST-6)
Location: HARTFORD
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in MAHASKA, IOWA
From 12-JUN-10 22:03:00 to 19-JUN-10 21:18:00 (CST-6)
Location: PEORIA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WEBSTER, IOWA
From 13-JUN-10 14:00:00 to 16-JUN-10 00:50:00 (CST-6)
Location: LEHIGH
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in POLK, IOWA
From 13-JUN-10 09:41:00 to 15-JUN-10 12:18:00 (CST-6)
Location: DES MOINES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WAPELLO, IOWA
From 12-JUN-10 05:54:00 to 13-JUN-10 04:54:00 (CST-6)
Location: CHILLICOTHE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in WAPELLO, IOWA
From 12-JUN-10 07:20:00 to 16-JUN-10 06:42:00 (CST-6)
Location: EDDYVILLE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in DALLAS, IOWA
From 13-JUN-10 06:24:00 to 17-JUN-10 23:57:00 (CST-6)
Location: DAWSON
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in DALLAS, IOWA
From 13-JUN-10 13:13:00 to 14-JUN-10 23:00:00 (CST-6)
Location: BOUTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in POLK, IOWA
From 12-JUN-10 07:00:00 to 20-JUN-10 04:19:00 (CST-6)
Location: (DSM)DES MOINES INTL
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in DALLAS, IOWA
From 12-JUN-10 19:52:00 to 15-JUN-10 00:30:00 (CST-6)
Location: VAN METER
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Flood in POLK, IOWA
From 12-JUN-10 03:07:00 to 21-JUN-10 00:12:00 (CST-6)
Location: (DSM)DES MOINES INTL
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Official NWS Observations