The dry weather continues into fall

Since early August, much of southeast South Dakota, southwest Minnesota, and northwest Iowa has been dry with the driest weather centered over southwest Minnesota.  A look at records at a few cities across the region shows that the 3 month period of August  - October has been amongst the driest observed.  The exception has been over portions of the James Valley where Yankton and Huron have had over 4 inches of rain since August 1.  Meanwhile, Marshall, Minnesota has only seen 1.04 inches of rain since August 1 making it the driest August to October on record.   Sioux Falls, Brookings and Spencer have seen between 2 and 2.5 inches of rain in the 3 month period which making it amongst the Top 5 driest August to Octobers on record.  Sioux City, which received 2.53 inches of rain in August, has only seen 0.54 inches of rain since September 1.  For August to October, it has only been the 6th driest but it is the driest September to October on record.

 

For most location in the region, the driest month was September where all but Huron saw one of the driest Septembers on record.  Only Yankton received over half an inch of rain during the month which still ranked as the 3rd driest on record.  Huron was the only site that did not see one of the 10 driest months on record as its monthly rainfall of 0.45 in. ranked only 20th.  October was dry east of the James River where Sioux City, Spencer, and Marshall received less than half an inch of precipitation and Sioux Falls and Brookings were less than an inch.  Nonetheless, October can be a dry month across the region so only Sioux City and Spencer were in the Top 10 for the driest october on record.

 

Below are tables looking at rainfall each month compared to the driest on record and normal as well as rainfall over the last 3 months and last 2 months. 

 

Precipitation for August - October 2011
City
2011
Rank

Record
Observed

Year of
Record
Normal
Huron 4.23 49 1.01 1893 6.68
Sioux City 3.07 6 2.22 1958 8.32
Sioux Falls 2.23 2 2.01 1999 7.99
Brookings 2.18 2 1.67 1925 8.31
Yankton 7.52 52 1.34 1958 7.98
Marshall 1.04 1 1.68 (old) 1967 8.61
Spencer 2.45 3 2.18 1958 9.19

Precipitation for September - October 2011

City
2011
Rank

Record
Observed

Year of
Record
Normal
Huron 1.88 36 0.10 1952 4.25
Sioux City 0.54 1 0.57 (old) 1939 5.09
Sioux Falls 0.83 2 0.47 1952 4.94
Brookings 0.66 3 0.27 1935 5.24
Yankton 2.40 21 0.36 1952 5.01
Marshall 0.74 3 0.72 1952 5.22
Spencer 0.52 1 0.95 1952, 1958 5.36

Precipitation for August 2011
City 2011 Rank

Record
Observed

Year of
Record
Normal
Huron 2.35 75 0.14 1976 2.43
Sioux City

2.53

61 0.12 1971 3.23
Sioux Falls 1.40 T28 0.36 1907 3.05
Brookings 1.52 29 0.35 1927 3.07
Yankton 5.12 T67 0.27 1971 2.97
Marshall 0.30 1 0.57 (old) 1949 3.39
Spencer 1.93 T20 0.56 1976, 1999 3.83

Precipitation for September 2011
City
2011
Rank

Record
Observed

Year of
Record
Normal
Huron 0.45 20 0 1998 2.46
Sioux City

0.31

T3 0.07 1950 2.96
Sioux Falls 0.20 1* 0.21* (old) 1899 2.77
Brookings 0.14 3 0.04 1935 3.19
Yankton 0.52 3 0.20 1998 2.69
Marshall 0.25 2 0.18 1974 3.09
Spencer 0.24 2 0.09 1940 3.26
* Based on records where daily precipitation exists from 1893-present.

Precipitation for October 2011
City
2011
Rank

Record
Observed

Year of
Record
Normal
Huron 1.43 78 0 1952 1.79
Sioux City

0.23

10 0 1952, 1958 2.13
Sioux Falls 0.63 27 0 1933, 1952 2.17
Brookings 0.52 29 0 1895, 1952, 1964 2.05
Yankton 1.88 50 0 1933, 1952, 1958 2.32
Marshall 0.49 19 0 1952 2.13
Spencer 0.28 T5 0 1952 2.10



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