September 2013 Central Indiana Climate Summary

                 Central Indiana

September 2013

Climate Summary

36th Warmest on record at Indianapolis

69th Wettest on record at Indianapolis



Above average temperatures reigned across Central Indiana during much of the first two weeks of the month. High pressure and a dry ground allowed temperatures to top out in the mid 90s in some areas on the 10th and 11th, and these helped average temperatures reach readings around 15 degrees above normal.

A cold front brought some relief to the warm temperatures and allowed readings to get below normal for the middle of the month. Highs failed to reach 70 degrees at some locations on the 13th and 16th.

The latter half of the month saw more variability in temperatures, with swings to above and below normal during that period. Normal temperatures naturally cool during the latter half of September as autumn sets in, so highs in the lower 80s with lows in the mid 50s led to above average conditions.


September 2013     Avg Temp

September 2013 Difference from Normal



Lowest Temperature




96 on 10

48 on 14 and 22




96 on 10 and 11

41 on 14




96 on 10

38 on 14

Terre Haute



97 on 10

40 on 14




94 on 10

42 on 14 and 23




96 on 10 and 11

43 on 10

Indy – Eagle Crk.



95 on 10

45 on 14

Temperature data for Shelbyville was not available on September 29 and 30

At Indianapolis, there were 20 days with above normal average temperatures and 10 days with below normal average temperatures.

September 2013 was the 36th warmest in the Indianapolis area since 1871.




Rainfall during September was near normal for much of the state, with below to much below normal rainfall in the northeast and southwest portions of Indiana.  Monthly rainfall totals ranged from around an inch in southwest and northeast Indiana to over 6 inches in south central and east central Indiana.  Most of the state received between 2 to 4 inches of rainfall during September.

September was quite dry through late on the 18th especially north of Interstate 70.  The passage of a cold front on the 11th brought the first significant rainfall of the month with 1 to 2 inches falling in portions of southern Indiana.

The most significant rainfall of the month occurred on the 19th.  Much of the state received one-half to nearly 3 inches of rainfall.  Precipitation totals in portions of northwest Indiana exceeded 4 inches.  This was the largest daily rainfall total at the Indianapolis airport since June 23rd.  Another bout of rain quickly followed late on 20th and early on the 21st.   Amounts ranged from one-half of an inch in central Indiana to nearly 2 inches in southeast Indiana. 

The last rainfall of the month fell on the 29th.   Much of southwest and central Indiana received one-half to slightly over an inch of rain.  Overall, rainfall during the last two weeks of September comprised the bulk of the month’s precipitation.

The dry spell that began in August continued through September 17th.  According to the U.S. Drought Monitor of the 17th, abnormally dry to moderate drought conditions existed in more than 80% of the state.    Rainfall from the 19th through early on the 21st reduced this coverage to less than 60% according to the following week’s U.S Drought Monitor.  Rainfall on the 29th provided additional improvement to dry conditions in much of central Indiana. 

The U.S. Geological Survey Water Watch indicated normal stream flow for the 7 day period ending September 30th in much of central and southern Indiana.  The only areas with below normal stream flow were the Vermilion River and the upper East Fork White River watersheds.   Local reservoirs ranged from one-half to nearly 2 feet below normal levels.




September 2013 Precipitation

September 2013 Difference from Normal

Wettest Day

Longest Dry Stretch




1.53 on 19

 7 days 22-28




2.21 on 19

 11 days 1-11




0.95 on 19

 11 days 1-11

Terre Haute



0.55 on 20

 11 days 1-11




0.66 on 20

 7 days 22-28




0.89 on 19

 7 days 22-28

Indy – Eagle Crk.



1.01 on 19

 7 days 22-28

 Precipitation data for Shelbyville was not available on September 29 and 30

September 2013 was the 69th wettest in the Indianapolis area since weather records began in 1871.


Severe Weather

Little severe weather occurred across Central Indiana during September. An isolated severe storm brought trees and power lines down in Rushville on September 10th. Some heavier rain caused minor flooding issues in some areas on the 19th.


For information on severe weather in other areas during September, visit the Storm Prediction Center “Severe Weather Event Summaries” website at




The maximum wind gust at Indianapolis International Airport was 35 mph out of the south on the 10th. Fog or haze was reported at Indianapolis on 14 days during the month.  Thunder was reported on 2 days during September.


October 2013 Outlook


The official outlook for October 2013 from the Climate Prediction Center indicates a greater chance of above normal temperatures for central Indiana.  At Indianapolis, the average temperature for the month is 55.0 degrees.  The outlook also calls for equal chances of above normal, normal, and below normal precipitation. The average precipitation for October at Indianapolis is 3.12”.



Data prepared by the Indianapolis Forecast Office.

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