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Aug
02

July 2011 Weather Recap

By · August 2, 2011 at 5:04 am
July 2011 was the driest on record, and the second hottest in Indianapolis history!  The numbers were crunched by the Indy NWS, click here for the original link.
 
July 2011 will go down in history at Indianapolis as the hottest month in 75 years since July of 1936 and the 2nd hottest since weather records began in 1871. During the summer of 1936, the Midwest and much of the nation was in the middle of the epic Dust Bowl. A persistent upper level ridge of high pressure is to blame for the prolonged period of heat this July. Nearly every day of the month was at or above normal. Much of the second half of the month was near 10 degrees above normal, when the most intense heat waves impacted the area. Combined with relatively high amounts of moisture in the air, conditions became dangerous and posed a clear threat for those exposed to the excessive heat.  Heat index values consistently ranged from the 100s to 110s across central Indiana during several periods in the second half of the month.
 
Several locations broke into the triple digits on the 21st. Indianapolis reached 100 on this day, which was the first time since August of 1988 (102 degrees). Many locations had impressive strings of consecutive days with maximum temperatures at least 90 degrees. Shelbyville and Eagle Creek both finished the month with 16 straight days of highs at or above 90 degrees, and Indianapolis had 15. Temperatures look to continue such a trend into early August, which would give Indianapolis a good chance of coming close to the record of 19 straight days set back in August of 1936.
 
 
Site
July 2011 Avg Temp
July 2011 Difference from Normal
Highest
Temperature
Lowest Temperature
Indianapolis
82.0
+6.6
100 on 21
63 on 5
Lafayette
79.9
+6.1
101 on 21
59 on 5
Muncie
79.4
+4.9
97 on 21
57 on 14
Terre Haute
79.8
+3.6
99 on 21
60 on 5
Bloomington
79.0
+3.6
96 on 21
59 on 15
Shelbyville
80.1
+4.9
97 on 21 and 20
60 on 14
Indy – Eagle Crk.
81.2
+5.8
98 on 21
63 on 14
 
At Indianapolis, all 31 days had above normal average temperatures.
 
July 2011 was the 2nd warmest in the Indianapolis area since 1871.

Precipitation
The persistent upper ridge of high pressure that prevailed over the central United States for the vast majority of the month not only contributed to above normal temperatures, but it has also deflected storms from much of central Indiana. Any chances for precipitation usually accompanied a weak frontal passage or stationary front, and any development typically was not widespread across the area. With generally weak wind shear in place, there were not many opportunities for storms to become well-organized or longer-lived. As a result of the lack of widespread shower and thunderstorm development, the monthly total precipitation across central Indiana included some notable variation. While most locations were below normal, including much of the central and eastern portions having less than half an inch, some areas to the west and southwest had 5 to 8 inches.
 
Site
July 2011 Precipitation
July 2011 Difference from Normal
Wettest Day
Longest Dry Stretch
Indianapolis
0.47
 -3.95
0.22 on 24
15 days 9-23
Lafayette
3.37
 -0.63
2.01 on 2
10 days 13-22
Muncie
2.63
 -1.35
1.07 on 7
10 days 12-21
Terre Haute
2.62
 -1.83
1.36 on 29
6 days 13-18
Bloomington
1.93
 -2.39
1.46 on 3
15 days 9-23
Shelbyville
0.06
 -3.97
0.03 on 8
7 days 9-15
Indy – Eagle Crk.
0.68
 -3.74
0.23 on 30
12 days 12-23
                           
July 2011 was the driest in the Indianapolis area since weather records began in 1871.

 

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