Central Indiana November 2009 Climate Summary


9th Warmest on record at Indianapolis
         9th Driest on record at Indianapolis



After a very cool and wet October across central Indiana, warm and much drier weather was prevalent for much of November. The first half of the month saw almost no precipitation fall across central Indiana as high pressure remained the dominant feature across the Ohio Valley. An upper level low produced wet and cool weather from the 16th through the 19th as it moved slowly across the region. Milder weather returned beginning on the 20th as high pressure reestablished. A change to cooler and more unsettled weather began with the passage of a cold front late on the 25th, with the first snowflakes for many being witnessed on Thanksgiving Day.

Temperatures for the first two weeks of November were much above normal, running 10 to 20 degrees warmer than average. With the exception of the 11th and 12th which saw many locations remain in the upper 50s for highs, high temperatures were above 60 degrees from the 6th through the 15th. Much of the region made it to 70 degrees on the 7th and 8th. With high pressure remaining largely in control through the period, most of the days were characterized by abundant sunshine and light winds. 
The arrival of a slow moving upper level disturbance brought cooler temperatures to central Indiana with highs largely remaining in the 40s from the 16th through the 19th. High temperatures returned to 5 to 10 degrees above normal from the 20th through the 24th as high pressure reestablished. The coldest temperatures arrived on Thanksgiving Day with much of the region staying in the 30s for highs in the wake of a cold front. Temperatures then returned to near or above normal for the remainder of the month.
After morning lows on the 1st of 32 degrees at Indianapolis, temperatures would not drop down to the freezing level until the morning of the 12th when the low again fell to 32 degrees. Sub freezing temperatures would not occur at Indianapolis until the morning of the 28th.   In total, temperatures fell to 32 degrees or lower only four times at Indianapolis. Typically in Indianapolis, temperatures fall to or below 32 degrees 14 times in November. In more rural areas of central Indiana, temperatures fell below freezing with more frequency throughout the month.

November 2009 Avg Temp
November 2009 Difference from normal
Lowest Temperature
72 on 8
29 on 28
75 on 8
29 on 1
71 on 8
25 on 27
Terre Haute
71 on 7 and 8
26 on 12
73 on 8
26 on 27
70 on 7 and 8
27 on 27
Indy – Eagle Crk.
72 on 8
28 on 28

At Indianapolis, there were 5 days with below normal average temperatures, 23 days with above normal average temperatures, and 2 days with exactly normal temperatures.
November 2009 was the 9th warmest in the Indianapolis area since 1871, and the warmest since 2001.
After one of the wettest Octobers on record, November was very dry for all of central Indiana.  The dry weather during the first half of the month enabled many farmers to harvest their crops. As of November 23, this was the latest harvest of corn since 1992.
A slow moving upper level disturbance produced scattered rain showers beginning late on the 15th over west central Indiana, and continuing through the 19th. The most substantial rainfall during this time period occurred across west central Indiana from north of Terre Haute through Lafayette, where several locations saw between 1 and 4 inches. This rainfall led to minor lowland flooding along the Wabash River from Montezuma to near Vincennes.
Additional light precipitation fell on the 25th and 26th, and again on the 29th as two successive cold fronts crossed the region.  
Monthly rainfall ranged from less than one half of an inch in southern Indiana to over 4 inches in northwest portions of Indiana. Rainfall was below normal for virtually all of central and southern Indiana. Much of south central Indiana received only 10 to 25 per cent of normal November precipitation. This same area had received more than 3 times the normal rain for October.

November 2009 Precipitation
November 2009 Difference from Normal
Wettest Day
Longest Dry Stretch
0.75” on 17-18
10 days 5-14
1.26” on 15-16
14 days 1-14
0.29” on 17-18
10 days 5-14
Terre Haute
0.71” on 16-17
10 days 5-14
0.54” on 17
11 days 5-15
0.94” on 17-18
10 days 5-14
Indy – Eagle Crk.
0.75” on 17-18
10 days 5-14

November 2009 tied for the 9th driest in the Indianapolis area since 1871, and the driest since 1981.
Many locations received their first snowfall of the season on Thanksgiving Day as colder air spread across central Indiana in the wake of a frontal passage. Wet snowflakes mixed in with light rain throughout the day, providing trace amounts of snowfall. Typically in November, the Indianapolis area receives 1.3 inches of snowfall.
Severe Weather

No severe weather occurred in central Indiana in November.
For information on severe weather in other areas during November, visit the Storm Prediction Center “Severe Weather Event Summaries” website at http://www.spc.noaa.gov/climo/online/
At the Indianapolis International Airport, the peak wind gust this month was 33 mph from the northeast on November 16, then again from the west on the 25th. Fog or haze was observed on 14 days, including 10 straight days from the 17th to the 26th. 1 day of dense fog was observed on the 20th.
December 2009 Outlook
The official outlook for December 2009 from the Climate Prediction Center, indicates a higher chance of below normal temperatures across central Indiana. At Indianapolis, the average temperature for the month is 31.6 degrees. An equal chance of above, near, or below normal precipitation exists across central Indiana in December.  At Indianapolis, the average precipitation for December is 3.03” and the average snowfall is 6.4”.


Data prepared by the Indianapolis Forecast Office.


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