Sioux City has its record coldest minimum temperatures for September

While 2012 has been a very warm year across the region, Sioux City set a record for the coldest average low temperatures for September.  At the same time, Sioux City also had the 8th warmest maximum temperatures for the month.  While neither Sioux Falls nor Huron set records for September, Huron did have its 8th coldest minimum temperature for the month and both locations were in the Top 20 warmest maximum temperatures and Top 20 coldest minimum temperatures.  The table below shows the actual values as well as the record value for each location.

Average Minimum and Maximum Temperatures for September
Location Average Minimum Temperature 2012 Rank Record Ave. Minimum Temperature Year Average Maximum Temperature 2012 Rank Recprd Ave. Maximum Temperature Year
Sioux City, IA

44.6

1

45.2

2003

81.7

8

86.1

1897

Sioux Falls, SD

46.5

Tied 19

40.6

1899

78.9

Tied 16

85.6

1908

Huron, SD

43.7

8

40.3

1965

80.7

11

84.7

1897

It is very rare to have record cold minimum temperatures and near record warm maximum temperatures the same month.  The reason for this has been the continued drought conditions across the area.  With a very dry air mass combined with sunshine and relatively mild air, the conditions have been ideal for large diurnal ranges in temperatures with very cool low temperatures and very warm high temperatures.  On many days, the difference between the high and low temperature was over 40 degrees.  The average diurnal range for September is around 25 degrees.  However, in 2012, the average diurnal range was around 37 degrees for Sioux City and Huron and 32 degrees in Sioux Falls.  In Sioux City, the large diurnal range was 48 degrees on September 8 when the high was 87 degrees and the low 39.  In Sioux Falls, the large diurnal range was 43 degrees on September 29 when the high was 82 degrees and the low was 39 degrees.  In Huron, the largest diurnal range was 46 degrees on September 13 when the high was 82 and the low was 36 degrees.



Return to News Archive

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.