What A Difference A Year Makes...

Figure 1: Comparison of average temperature for March through June for 2012, 2013, and Normal.
Figure 2: Comparison of precipitation for March through June for 2012, 2013, and Normal.
Figure 3: Comparison of days reaching 90 degrees or higher for March through June for 2012, 2013, and Normal.

NWS
St. Louis, Missouri

What A Difference A Year Makes...

Comparing 2013 to 2012 -
March through June

Compare
Compare
Compare
Average Temperature Precipitation Number of 90 Degree Days


THIS SPRING WAS DRASTICALLY DIFFERENT THAN LAST YEAR. IN 2012...TEMPERATURES SOARED IN THE MONTH OF MARCH...SETTING THE STAGE FOR A RECORD WARM SPRING. ST. LOUIS AND COLUMBIA WENT ON TO EXPERIENCE THEIR WARMEST CALENDAR YEARS EVER. THIS YEAR...THE SPRING (MAR-JUN) MONTHLY AVERAGE TEMPERATURES WERE ABOUT 2 DEGREES BELOW NORMAL...WHICH IS OVER 8 DEGREES COOLER THAN LAST YEAR. 2012 SET A REMARKABLE NUMBER OF TEMPERATURE RECORDS DUE TO THE VERY WARM START TO THE YEAR. THAT EARLY START IS IN STARK CONTRAST TO THIS YEAR. THIS IS EVIDENT IN A COMPARISON OF 90+ DEGREE DAYS WITH 2013 HAVING JUST A FRACTION OF THE 2012 TOTAL.

THE DIFFERENCE IN PRECIPITATION TOTALS IS JUST AS DRAMATIC. THE SIGNIFICANT DROUGHT THAT DEVELOPED LAST YEAR CAN BE TRACED TO THE LACK OF PRECIPITATION TOWARDS THE END OF SPRING 2012. ST. LOUIS AND
COLUMBIA HAD APRILS WITH ABOVE NORMAL PRECIPITATION AND STILL FELL SHORT OF NORMAL FOR THE SPRING DUE TO A VERY DRY MAY AND JUNE. QUINCY DID NOT BENEFIT FROM THE APRIL RAINS AND HAD A SIGNIFICANTLY
LOWER 4 MONTH TOTAL. THE ONLY MONTH THAT PRECIPITATION HAS NOT BEEN ABOVE NORMAL THIS SPRING IS JUNE AT COLUMBIA AND QUINCY. QUINCY SAW ALMOST TWICE AS MUCH RAIN THIS MAY (11.39") AS THE ENTIRE 4 MONTH PERIOD LAST SPRING (6.59").

THE 2013 PRECIPITATION TOTAL FOR QUINCY SHOULD ACTUALLY BE SIGNIFICANTLY HIGHER DUE TO TWO MISSED EVENTS. THE FIRST MISSED EVENT WAS THE PALM SUNDAY SNOW STORM. THE TRUE AMOUNT OF LIQUID EQUIVALENT FROM THE STORM WILL NEVER BE KNOWN. THE SNOW WAS STICKY AND FELL AT SUCH A RATE THAT THE AUTOMATED GAUGE WAS UNABLE TO PROCESS THE PRECIPITATION. THE OTHER EVENT WAS A WIDESPREAD HEAVY
RAINFALL EVENT IN THE MIDDLE OF APRIL. A COMPUTER GLITCH CAUSED A PORTION OF THE PRECIPITATION ON APRIL 17TH TO BE UNACCOUNTED FOR. THIS SECOND MISSED EVENT IS WHAT INITIATED THE FLOODING ON THE
MISSISSIPPI RIVER. A CONSERVATIVE ESTIMATE OF THE COMBINED MISSED PRECIPITATION AMOUNT IS APPROXIMATELY 3.5 TO 4 INCHES. IF THIS MISSED PRECIPITATION IS INCLUDED...IT WOULD PUSH THE 4 MONTH TOTAL TO NEARLY 25 INCHES WHICH IS 4 TIMES WHAT THE REGION SAW DURING THE SAME TIME LAST YEAR.

THE ENTIRE MIDWEST HAS EXPERIENCED A SIMILAR TURN AROUND WITH A VERY COOL WET SPRING THIS YEAR. THIS HAS LED TO SIGNIFICANT AND SUSTAINED FLOODING ALONG THE MISSISSIPPI RIVER THAT IS JUST NOW SUBSIDING.


AVERAGE TEMPERATURE (MAR-JUN)
        2012    2013    NORMAL

KSTL    68.2    59.8     61.6
KCOU    66.5    57.3     59.1
KUIN    63.9    55.5     57.5

NUMBER OF 90 DEGREE DAYS (MAR-JUN)
        2012    2013   NORMAL

KSTL     24      14      10
KCOU     21       6       4
KUIN     14       5       3

HIGHEST OBSERVED TEMPERATURE THROUGH JUNE 30TH
        2012    2013

KSTL     108     96
KCOU     107     95
KUIN     104     95

TOTAL PRECIPITATION (MAR-JUN)
        2012    2013    NORMAL

KSTL    14.30   23.68   16.01
KCOU    15.21   22.52   16.85
KUIN     6.59   21.55*  14.68

* 3 DAYS OF MISSING PRECIPITATION ACCOUNT FOR APPROXIMATELY 3.5 TO 4 INCHES NOT INCLUDED IN THIS
TOTAL. FOR A MORE DETAILED  EXPLANATION...PLEASE SEE THE ABOVE TEXT.



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