September 2006 Was the Coldest Since 1993
September 2006 will go down into the climate record books as one of the coolest in recent years. Bucking the trend of the previous two Septembers, the month checked in more than two degrees below normal. The month also saw a return of above normal precipitation, but not significantly so.
Here is a more detailed summary of the weather conditions that were experienced across portions of Central Indiana in September, 2006.
September of 2006 recorded an average temperature of 64.1 degrees. This was below normal by 2.2 degrees. This is the coldest September in the Indianapolis area since 1993, when the average temperature was 62.1 degrees. In comparison to last September, this year was considerably cooler, by nearly 6 degrees.
This tied with September 1896 for the 19th coolest September ever in the Indianapolis area.
The first half of the month was largely very close to normal. Occasional warmth and coolness were experienced, but not much above or below normal. The 7th through 11th of the month saw 5 consecutive days with highs of 80 degrees or greater, but even that was not enough to save the month from recording below normal temperatures. Following the up and down first portion of the month, Fall made an abrupt arrival by the 18th and 19th of the month. A strong early season cold front plunged temperatures across the area and resulted in a high temperature on the 19th of only 59 degrees. This was the first time since 2003 a day in September failed to reach 60 degrees for a high temperature.
After the abrupt shift to cool weather mid-month, this cool trend persisted to close out the month. Of the last 13 days of the month, only two days experienced above normal temperatures.
No temperature records were broken at Indianapolis during the month.
On average, September is usually one of the drier months of the year. This was not the case this year, as 3.53 inches of precipitation was observed at the Indianapolis Airport.
This was above normal by 0.65 inches, and made for the first month since June that saw a precipitation total above normal. Rainfall came in a fairly even distribution, falling with at least half an inch each week, except for the first 10 days of the month when only 0.18 inches of rain fell. Other portions of the area received considerably more rain than the airport did due to some isolated heavy thunderstorms, but this was rather spotty.
No precipitation records were broken at Indianapolis during the month.
Severe weather took a sharp downward trend during the month of September as is typical for Autumn. The largest and most widespread event came on the 27th of September. Thunderstorms during the late afternoon and early evening hours produced several occasions of marginally severe hail across portions of the Indianapolis Metro Area, as well as a few other locations across central Indiana. Hail ranged from pea sized all the way up to an occasional quarter sized hail stone. No damage was reported from this severe weather.
YEAR TO DATE SUMMARY
Through the end of September, the yearly average temperature now stands at 57.8 degrees. This puts the year into a three way tie for 21st warmest year ever through this point, and interestingly enough, it is exactly the same average temperature as last year at this time. Total precipitation through the end of September stands at 36.10 inches, which makes this the 23rd wettest year to date.
The monthly outlook for October shows a strong likelihood for warmer than normal weather during the first week. It appears that temperatures could reach back above the 80 degree mark for a few days during the start of the month. Longer term outlooks suggest a higher likelihood of warmer than normal temperatures through mid-month.
Indianapolis Area period of record covers 1871-2006
Normals refer to period 1971-2000
Data prepared by Climate Services Focal Point, Logan Johnson
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