July 2007 Climate Summary

July 2007: Dry and Cool
Driest July in 5 Years
 
July 2007 is likely to be remembered for its relatively dry weather. In addition, the month ended up being cooler than normal. Many times when dry conditions occur during mid-summer, they are accompanied by warmer than normal conditions. However, this was not the case this month. It was the driest July since 2002, and the coolest since 2003.  The dry weather that continued during this July is a continuation of the abnormal dryness that has been present in the area since May. This was the third consecutive month of below normal precipitation. Rainfall deficits for this three month period in Indianapolis are near seven inches. The following is a weather summary for selected points in Central Indiana during July 2007.
 
Temperature
The average monthly temperature for July 2007 was 74.3 degrees in Indianapolis. Compared to a normal of 75.4 degrees, this was below normal by 1.1 degrees. This made July 2007 the coolest July in Indianapolis since July of 2003 when the average temperature in Indianapolis was 74.0 degrees.
 
July saw a low number of days with a high temperature of 90 degrees or greater. Besides the 92 degree high temperatures recorded on the 8th and 9th, the only other day in the 90s came on the final day of the month, with a high of 91 in Indianapolis.
 
A normal July would expect to see seven days with a high temperature of 90 degrees or more. Last year there were 8 days of 90 or higher in Indianapolis.
 
Across Central Indiana, every site saw a monthly average temperature below normal for July 2007. Most sites also only saw 2 or 3 days in the 90s this month.
 
Site
July 2007 Avg. Temp.
Normal July Avg. Temp.
July 2007 Diff. From Normal
July 2007 highs in the 90s
Indianapolis Int’l Arpt.
74.3
75.4
-1.1
3
Indianapolis
Eagle Creek
73.9
75.4
-1.5
3
Lafayette
72.6
73.8
-1.2
3
Terre Haute
71.8
76.2
-4.4
2
Bloomington
72.3
75.4
-3.1
2
Shelbyville
71.1
75.2
-4.1
2
Muncie
70.9
74.5
-3.6
3
 
 
Precipitation
July 2007 totaled 1.90 inches of precipitation at Indianapolis. This was well below the normal value of 4.42 inches. This is the made it the driest July since 2002 when only 1.65 inches of rain fell. Overall, it was the 22nd driest July on record. The driest period this month came between the 1st and 12th of the month, when 0.03 inches of precipitation fell. The current dry spell began in late April and has continued every month since. The period May 1 to July 31 was below normal by 6.82 inches.
 
As a whole for the year of 2007, rainfall has been below normal at Indianapolis by 3.37 inches.
 
Across Central Indiana, rain was heaviest in the west central and south west portions of the area. Rainfall was very spotty elsewhere, and numbers are not often completely representative of an entire area since the rainfall was never very widespread.
 

Site
July 2007 Precipitation Total
Normal July Precipitation
July 2007 Difference from Normal
Indianapolis
Int’l Arpt.
1.90
4.42
-2.52
Indianapolis
Eagle Creek
2.09
4.42
-2.33
Lafayette
2.40
4.02
-1.62
Terre Haute
4.54
4.44
+0.10
Bloomington
4.07
4.32
-0.25
Shelbyville
1.93
4.04
-2.11
Muncie
1.46
4.00
-2.54

 
 
Severe Weather
Severe weather was almost non-existent across Central Indiana during the month of July. Other than a few reports of wind damage on the 4th and 19th of the month, the only other event was some flash flooding on July 26th.
 
Outlook for August 2007
The official outlook for Indiana indicates an equal likelihood of above, below, or near normal values for precipitation and temperatures.
 
Data prepared by Logan Johnson, Climate Services Focal Point
Assistance provided by National Weather Service, Indianapolis Forecast Team


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