Figure 1: A 1039mb Arctic high built across the center of the United States on the 9th of January 2010.
Figure 2: Snowfall Map from January 6th and 7th.
Figure 3: Ice on Missouri River near Washington, Missouri. Courtesy of KMOV-TV.

NWS
St. Louis, Missouri

A Cold Beginning To 2010

The first twelve days of January 2010 were much colder than normal.  This period was the coldest start in St. Louis, Missouri since 1979.  During those twelve days much of the area remained below freezing.  Even though no records were set during this period, it had been quite some time since the area had experienced an arctic outbreak of this magnitude.  A moderate snowfall event occurred on January 6th and 7th which aided in temperatures dropping well below zero in many locations when a 1039mb Arctic high pressure system built into the Midwest.  In addition, wind chill readings of 10 to 25 degrees below zero were quite common in the wake of the storm system.

             Top Ten Coldest                    Top Ten Coldest
           Average Temperatures               Average Temperatures
            For St. Louis (KSTL)               For Quincy (KUIN)
              January 1-12th                     January 1-12th

              1.  8.5  1912                       1.  4.6 1979
              2. 10.8  1979                       2.  6.1 1974
              3. 12.2  1879                       3.  6.7 2010
              4. 13.0  1974                       4. 10.0 1977
              5. 14.1  1884                       5. 10.8 1970
              6. 14.6  1977                       6. 11.0 1968
              7. 15.2  2010                       7. 11.3 1999
              8. 15.5  1968                       8. 13.8 1982
              9. 16.5  1940                       9. 15.8 1969
             10. 17.2  1942                      10. 16.2 1973

             Average = 29.3                     Average = 23.2
             (1870-Present)                     (1948-Present)


Weather Map
Snowfall Map
Ice Picture


ASOS/AWOS COLDEST COLDEST
TEMPERATURE WIND CHILL

ST. LOUIS 0 -15
COLUMBIA MISSING* MISSING*
JEFFERSON CITY -8 -15
CHESTERFIELD -7 -14
ST. CHARLES -8 -14
FARMINGTON -8 -15
QUINCY -10 -23
CAHOKIA -5 -13
BELLEVILLE/SCOTT -4 -13
PITTSFIELD -11 -23
SPARTA 1 -11
SALEM -4 -10
ALTON -4 -16
CENTRALIA -3 -12
LITCHFIELD -6 -13
SULLIVAN -6 -17


* 1/8/2010-1/10/2010 - ASOS TEMPERATURE SENSOR WAS IN ERROR
COOP OBSERVERS

ROSEBUD -16
CANTON L/D 20 -13
PERRY IL -13
FREEDOM -12
JERSEYVILLE -12
LAKE ST. LOUIS -11
WHITE HALL -11
RAMSEY -10
SHELBINA -10
WASHINGTON -10
FULTON -9
GRIGGSVILLE -9
FREDRICKTOWN -9
BOWLING GREEN -7
HANNIBAL -7
FESTUS -7
NASHVILLE -7
BELLEVILLE -6
MEXICO -6
ST. CHARLES -6
WARRENTON -6
SAVERTON L/D 22 -5
ST. PETERS -4
SALEM -3

BELLEVIEW -3
ST. CHARLES 7SSW -3
WELDON SPRING NWS -3
O'FALLON MO -2
POTOSI -2
UNIVERSITY CITY -1
ALTON L/D 26 1
VANDALIA IL 1
KASKASKIA L/D 4

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