July 2013 Climate Summary

Central Indiana
July 2013
Climate Summary
Tied for 30th Coolest on record at Indianapolis
Tied for 71st Driest on record at Indianapolis
July got off to a cool start as a persistent upper low meandered across the Ohio and mid Mississippi Valleys. High temperatures through the first six days generally remained in the 70s to lower 80s. The departure of the upper low enabled a warmer and more humid airmass to return to the region beginning on the 7th with highs rising into the middle and upper 80s. A few locations even made it into the lower 90s on the 9th. The passage of a cold front on the 10th ushered in a brief period of slightly cooler temperatures and noticeably less humid air with highs in the lower 80s and lows in the lower and middle 60s.
The hottest weather of the month arrived beginning on the 14th as a large upper level ridge expanded east into the Ohio Valley. High temperatures returned to the upper 80s to near 90 on the 14th and 15th in many locations, followed by highs rising into the lower and middle 90s from the 16th through the 19th. A cold front brought an abrupt end to the heat on the 20th with highs reverting back into the lower 80s. High temperatures returned into the upper 80s and lower 90s briefly on the 23rd as the front lifted back north into the region.
The cold front moved back south late on the 23rd, ushering in much cooler and drier air into the Ohio Valley and Great Lakes. A broad upper level trough would build into the region and keep cooler temperatures across central Indiana for the rest of the month. High temperatures generally remained below 80 degrees for the last eight days of the month, impressive for late July. At Indianapolis, every day from the 24th through the 31st experienced temperatures in the 70s. This tied a long standing record for most consecutive days with highs under 80 degrees in the capital city, a record that had stood since 1871. A reinforcing shot of cooler air brought lows on the 28th and 29th into the upper 40s and lower 50s across central Indiana. Indianapolis set a record low of 51 degrees on the morning of the 28th, breaking the old record from 1971 and 2004 by three degrees. The average temperature was generally ten degrees cooler across central Indiana for this July compared to July 2012. After reaching 90 degrees or greater on 28 days in Indianapolis in July 2012, the mercury made it to 90 degrees on only 5 days this July.
July 2013 Avg Temp
July 2013 Difference from Normal
Lowest Temperature
93 on 16, 17 and 18
51 on 28
93 on 19
48 on 28
92 on 18 and 19
49 on 25
Terre Haute
94 on 17
49 on 28
93 on 17 and 18
49 on 28
94 on 16 and 17
51 on 28
Indy – Eagle Crk.
92 on 18
51 on 28
At Indianapolis, 12 days had above normal average temperatures, 18 days below normal temperatures and 1 day was at normal.
July 2013 was tied for the 30th coolest in the Indianapolis area since 1871.
July was a rather dry month for much of Indiana. Monthly rainfall totals ranged from near 1 inch in portions of central and northern Indiana to over 10 inches in a very small portion of southwest Indiana. Much of the state received 2 to 4 inches during July.
Favored areas for rainfall during July included much of west central Indiana, southern Indiana near the Ohio River and far northeast Indiana. Many locations in these areas received 4 to more than 6 inches of rain. The driest area of the state was portions of northwest Indiana where less than an inch of rain fell.
Heavy rainfall on the 1st and 2nd in southwest Indiana and southeast Illinois prolonged high river levels and caused lowland flooding along the lower Wabash River from immediately north of Vincennes to the Ohio River. Confined areas of heavy rainfall of 3 to 5 inches occurred on the 10th, 20th and 23rd and caused localized flooding, but no river flooding.   After the 2nd, rainfall of less than an inch fell in many areas during the remainder of the month.
According the US Drought Monitor of July 23, abnormally dry condition existed in portions of east central Indiana. Below normal precipitation has fallen in much of this area since October 1, 2012.   The US Geological Survey Water Watch indicated below normal stream flow for the 14 day period ending July 31 in much of the area.
July 2013 Precipitation
July 2013 Difference from Normal
Wettest Day
Longest Dry Stretch
0.89 on 20
3 days 17-19 and 23-25
1.34 on 22
9 days 11-19
0.63 on 2
9 days 11-19
Terre Haute
0.59 on 1 and 10
9 days 11-19
1.14 on 20
6 days 14-19
0.36 on 14
4 days 15-18
Indy – Eagle Crk.
1.05 on 2
9 days 11-19
July 2013 was tied for the 71st driest in the Indianapolis area since weather records began in 1871.
(*) – Precipitation missing at Muncie on 7/30.
Severe Weather
Only a few severe weather events occurred during the month. A persistent upper low remained across the Ohio Valley in early July, with isolated strong thunderstorms on both the 1st and 2nd. One storm produced 5 to 6 inches of rainfall across northern Jackson and southern Brown County on the evening of the 1st, with several roads washed out. An isolated storm on the evening of the 2nd knocked down several trees in Carmel. Scattered severe thunderstorms developed on the afternoon of the 10th along and ahead of a cold front moving through the area. Most of the storms remained north of Interstate 70, producing wind damage. Several tents at the Howard County Fair in Kokomo collapsed from strong winds, causing one minor injury.
Scattered strong to severe thunderstorms producing mainly wind damage impacted parts of central Indiana on the 20th and again on the 23rd as a frontal boundary lingered over the region. The storms on the afternoon of the 20th produced very heavy rainfall and localized flash flooding southwest of Indianapolis, including several water rescues from vehicles across Greene County.
For information on severe weather in other areas during July, visit the Storm Prediction Center “Severe Weather Event Summaries” website at http://www.spc.noaa.gov/climo/online/.
The maximum wind gust at the Indianapolis International Airport was 41 mph from the west on the 20th as a line of thunderstorms moved through Indianapolis. Fog or haze was reported at Indianapolis on 14 days this month, with dense fog taking place on the 3rd, 5th and 20th. Thunder was reported at Indianapolis on 6 days this month.
August 2013 Outlook
The official outlook for August 2013 from the Climate Prediction Center indicates a greater chance for below normal temperatures across central Indiana.   At Indianapolis, the average temperature for the month is 74.2 degrees. An equal chance of above, near or below normal precipitation exists across central Indiana. The average precipitation for August at Indianapolis is 3.13”.  
Data prepared by the Indianapolis Forecast Office.

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