2013 Climatic Summary for Sioux City, IA

...2013 YEARLY CLIMATIC SUMMARY FOR SIOUX CITY IOWA...

 

                             TEMPERATURE

 

 MONTH        AVERAGE                 DEPARTURE  EXTREMES   MONTHLY

             MAX   MIN      MONTHLY   FROM NORM  HIGH LOW   RECORDS

 

JANUARY      30.7 10.5        20.6    PLUS  0.2  55   -5

FEBRUARY     35.8 15.3        25.5    PLUS  0.4  52   -7

MARCH        40.5 21.5        31.0    MINUS 5.5  67    4

APRIL        55.7 31.7        43.7    MINUS 5.9  86   16    6TH COLDEST

                                                            3RD SNOWIEST

MAY          70.6 48.3        59.4    MINUS 1.4 106   29    4TH SNOWIEST

JUNE         79.9 59.7        69.8    MINUS 0.5  94   45

JULY         85.9 61.0        73.5    MINUS 0.8  94   44    6TH DRIEST

AUGUST       83.4 62.9        73.1    PLUS  1.0  92   51

SEPTEMBER    81.2 55.6        68.4    PLUS  5.0  94   34   11TH WARMEST

OCTOBER      62.6 37.6        50.1    MINUS 0.6  88   24    8TH WETTEST

NOVEMBER     47.5 22.0        34.8    MINUS 1.0  62    4

DECEMBER     28.8  7.1        18.0    MINUS 4.6  62  -11   10TH DRIEST

 

 2013        58.6 36.1        47.3    MINUS 1.3 106  -11

 

 

                           PRECIPITATION/WIND

 

                 DEPARTURE                DEPARTURE     MAX WIND GUST

   MONTH         FROM NORM     SNOWFALL   FROM NORM   DIRECTION/MPH/DATE

 

JANUARY   0.19  MINUS 0.43         1.4    MINUS 5.3    N 43 ON 19TH

FEBRUARY  1.01   PLUS 0.34         9.4    PLUS  2.8   NW 47 ON 18TH*

MARCH     2.00       0            11.7    PLUS  5.2   NW 48 ON  5TH

APRIL     4.85   PLUS 1.90        11.2    PLUS  9.4   NW 49 ON 24TH

MAY       5.28   PLUS 1.54         1.4    PLUS  1.4   NW 45 ON 16TH

JUNE      3.13  MINUS 0.76                            SW 47 ON 22ND

JULY      0.60  MINUS 2.84                             N 44 ON 19TH

AUGUST    3.07  MINUS 0.16                             W 44 ON 21ST

SEPTEMBER 1.44  MINUS 1.52                            NW 44 ON 19TH

OCTOBER   3.89   PLUS 1.76           T    MINUS 1.0    S 44 ON 11TH

NOVEMBER  1.09  MINUS 0.22         0.9    MINUS 3.5   NW 47 ON  1ST

DECEMBER  0.18  MINUS 0.62         2.3    MINUS 5.5   NW 61 ON 28TH

 

 2013    26.73  MINUS 1.01        38.3    PLUS  3.5   NW 61 DEC 28TH

 

* LAST OF SEVERAL OCCURRENCES FOR MONTH

 

2013 DID NOT DEVIATE TOO FAR FROM A NORMAL YEAR WHEN LOOKING AT THE

ENTIRE YEAR...A SHADE COOLER AND DRIER THAN THE LONG TERM AVERAGE.

THE MEAN TEMPERATURE FOR THE YEAR WAS 1.3 DEGREES BELOW NORMAL...

WHILE PRECIPITATION ENDED THE YEAR 1.01 INCHES ON THE SHY SIDE.

SNOWFALL FOR 2013 AT 38.3 INCHES DID MANAGE TO SNEAK A BIT ABOVE

NORMAL /3.5 INCHES/. FOR THE MOST PART...THESE YEARLY NUMBERS DID

FALL CLOSE TO THE MIDDLE OF THE LONG TERM CLIMATIC RECORD.

HOWEVER...PARTS OF THE YEAR PROVED TO BE EXTREME ON BOTH SIDES...

WHICH RESULTED IN AN ANNUAL AVERAGE CLOSE TO NORMAL.  THERE WERE 13

DAYS WITH BELOW ZERO LOWS...AND 24 DAYS WITH HIGHS OF 90 DEGREES OR

HIGHER.

 

THE WINTER OF 2012-2013 CLOSED OUT FAIRLY CLOSE TO NORMALS. JANUARY

WAS A DRY MONTH...AND A STRECH OF SEASONABLE WEATHER TO START THE

MONTH GRADUALLY MELTED THE 4 INCHES OF SNOWCOVER WHICH GREETED THE

NEW YEAR.  THERE WAS EVEN A PURE LIGHT RAINFALL EVENT ON THE 10TH.

WARMEST READINGS APPEARED MID MONTH...WHEN THE WARMEST HIGH OF 55

DEGREES OCCURRED.  AS THE WARMTH BROKE...THE MOST SIGNIFICANT

PRECIPITATION OF THE MONTH OCCURRED ON THE 20TH WHEN AROUND AN INCH

OF SNOW FELL. A FEW DAYS LATER...THE TEMPERATURES RETURNED BACK

TO WELL ABOVE NORMAL READINGS...UNTIL THE FINAL DAY OF THE MONTH.

COOL AND WINDY CONDITIONS ON THE 31ST TOOK WIND CHILLS TO 20 BELOW

TO 30 BELOW ZERO.

 

THE FRIGID CONDITIONS WERE VERY BRIEF...AS THE FIRST HALF OF

FEBRUARY FEATURED 13 CONSECUTIVE ABOVE NORMAL DAYS. THERE WAS EVEN A

THUNDERSTORM OBSERVED ON THE 10TH. THE WARMTH WOULD BE BALANCED BY A

STRETCH OF 10 CONSECUTIVE BELOW NORMAL DAYS TO END THE MONTH...

RESULTING IN NEAR NORMAL TEMPERATURES FOR THE MONTH. IN THE MIDST OF

THE COLD STRETCH...A WINTER STORM BROUGHT 8.9 INCHES SNOWFALL ON THE

21ST AND 22ND...NUDGING THE MONTHLY SNOW TOTAL ABOVE NORMAL...AND

BLANKETING THE AREA WITH THE GREATEST SNOW DEPTH OF THE WINTER AT 9

INCHES.  THE PRECIPITATION OF 0.62 INCHES ON THE 21ST WAS A RECORD

FOR THE DATE.

 

FOR THE WINTER SEASON OF 2012-2013 /DECEMBER THROUGH FEBRUARY/ WAS

SOMEWHAT WETTER THAN NORMAL AT 2.87 INCHES...AND ALSO SOMEWHAT

WARMER THAN NORMAL AT 23.9 DEGREES.

 

MARCH CONTINUED TRENDS FROM LATE FEBRUARY WITH ONLY 8 DAYS OF THE

MONTH ENDING UP ABOVE NORMAL. THE MEAN TEMPERATURE FOR THE MONTH WAS

5.5 DEGREES BELOW NORMAL AT 31.0 DEGREES...A SHARP CONTRAST FROM

2012...WHEN THE WARMEST MARCH OCCURED WITH A MEAN TEMPERATURE OF

53.2 DEGREES...A 22.2 DEGREE YEAR TO YEAR CHANGE! DESPITE NORMAL

PRECIPITATION IN MARCH...THE COLD TEMPERATURES MEANT A GREATER

AMOUNT OF SNOWFALL...WITH 11.7 INCHES DURING THIS SNOWIEST MONTH OF

THE YEAR. A MAJORITY OF THIS SNOW OCCURRED WITH A WINTER STORM ON

THE 9TH AND 10TH...WHEN 9.8 INCHES FELL. THE PRECIPITATION FOR THE

9TH WAS A RECORD FOR THE DATE AT 0.71 INCHES...AND A SNOWFALL ON THE

10TH OF 6.6 INCHES WAS A RECORD FOR THE DATE A BRIEF WARMUP MANAGED

TO MELT ALL 9 INCHES OF SNOW IN JUST 4 DAYS BY THE 15TH. HOWEVER...

COLD AIR CAME BACK TO DOMINATE MOST OF THE REST OF THE MONTH WITH

THE NEXT 13 DAYS BELOW NORMAL ACCOMPANIED BY PERIODIC LIGHT

SNOWFALL. A THUNDERSTORM WAS OBSERVED ON THE 30TH WITH AROUND A

THIRD OF AN INCH OF RAINFALL.

 

CHILLY EARLY SPRING CONDITIONS CONTINUED IN APRIL...WITH A FEW BRIEF

WARM PERIODS PERMEATING A LONGER TERM COLD TREND. MOST OF THE WARMER

WEATHER WAS VERY EARLY AND VERY LATE IN THE MONTH...WITH THE FIRST

70 DEGREE READING OF THE YEAR ON THE 6TH...AND THE FIRST 80 DEGREE

READING ON THE 28TH. SANDWICHED IN THE MIDDLE WAS A CHILLY AND

OCCASIONALLY SNOWY PERIOD.  THE MOST SIGNIFICANT WEATHER EVENT OF

THE MONTH WAS A SIGNIFICANT WINTER STORM WHICH BROUGHT FIRST HEAVY

RAINFALL TO THE AREA ON THE 9TH...THEN A MIX OF SNOW...SLEET AND

FREEZING RAIN FOR THE FOLLOWING COUPLE OF DAYS. PRECIPITATION OF

2.33 INCHES ON THE 9TH WAS NOT ONLY A RECORD FOR THE DATE...BUT

THE SECOND GREATEST PRECIPITATION FOR ANY APRIL DAY ON RECORD. THIS

PRECIPITATION...ALONG WITH A PAIR OF ADDITIONAL SPRING STORMS ON

THE 17TH/18TH /RECORD 4.7 INCHES/ AND THE 22ND /RECORD 1.5 INCHES/

HELPED PUSH APRIL 2013 TO BE THE THIRD SNOWIEST APRIL ON RECORD

/11.2 INCHES/...AND THE 10TH WETTEST APRIL /4.85 INCHES/.

FOLLOWING THE SNOWFALL...TWO RECORD LOWS WERE ESTABLISHED WITH

22 DEGREES ON THE 20TH...AND 25 DEGREES ON THE 25TH.

 

MAY PROVED TO BE ONE OF THE MOST EXTREME MONTHS OF THE YEAR. THE

MONTH STARTED WITH A RARE MAY SNOWFALL OF 1.4 INCHES. THIS WAS THE

FIRST MEASURABLE SNOWFALL IN MAY SINCE 1946. WHILE THE FIRST 12 DAYS

OF THE MONTH WERE BELOW NORMAL WITH THE FINAL FREEZE OF THE YEAR ON

THE 12TH...THE NEXT TWO DAYS SAW THE FIRST 90 DEGREE READING ON THE

13TH...AND THE WARMEST DAY ON RECORD FOR MAY ON THE 14TH WITH 106

DEGREES. THIS WAS THE WARMEST READING OF THE YEAR FOR SIOUX CITY.

AFTER THE WILD CHANGES EARLY IN THE MONTH...CONDITIONS SETTLED TO A

MORE NORMAL REGIME. RAINFALL FOR THE MONTH FEATURED PERIODIC MODEST

AMOUNTS...WITH THE NEXT GREATEST AMOUNT AFTER THE RAIN/SNOW ON THE

1ST MEASURED AT 1.02 INCHES ON THE 27TH.

 

METEOROLOGICAL SPRING /MARCH THROUGH MAY/ ENDED UP 12TH COLDEST AND

10TH WETTEST. IT WAS ALSO THE COLDEST SPRING SEASON SINCE 1996.

 

JUNE OVERALL WAS A FAIRLY NORMAL MONTH...SLIGHTLY BELOW NORMAL TO

START THE MONTH AND SLIGHTLY ABOVE NORMAL TO FINISH. THE WARMEST LOW

TEMPERATURE OF THE YEAR OCCURRED ON THE 21ST AT 79 DEGREES. DESPITE

NUMEROUS THUNDERSTORMS DURING THE MONTH...PRECIPITATION ENDED UP A

BIT BELOW NORMAL.  THUNDERSTORM OUTFLOW EARLY ON THE MORNING OF THE

22ND PRODUCED WIND GUSTS TO 47 MPH.

 

A CHANGE TO A MORE PRONOUNCED DRY PERIOD STARTED IN JULY...AND THE

MONTH WAS THE 6TH DRIEST JULY ON RECORD. ONLY A SINGLE EVENT

PRODUCED MORE THAN A QUARTER INCH OR RAINFALL...WITH 0.40 INCHES ON

THE 25TH. SEVERE WEATHER ALSO REMAINED SPARSE...WITH THUNDERSTORMS

ON THE 7TH RESULTING IN THE STRONGEST MEASURED WIND OF THE MONTH AT

44 MPH BUT ONLY A TRACE OF RAINFALL. TREE DAMAGE WAS REPORTED IN THE

LEEDS AREA DURING THE LATE EVENING. TEMPERATURES WERE FAIRLY CLOSE

TO NORMAL MUCH OF THE MONTH...BUT A SHARPLY COLDER PERIOD TOWARD THE

END OF THE MONTH PRODUCED A PAIR OF RECORD LOWS ON THE 27TH /47/ AND

28TH /44/...ALONG WITH A RECORD COLD MAXIMUM TEMPERATURE OF 67

DEGREES ON THE 29TH.

 

AUGUST 2013 WAS THE FIRST MONTH FEATURING ABOVE NORMAL TEMPERATURES

SINCE FEBRUARY. WHILE THE FIRST 19 DAYS OF THE MONTH WERE 4 DEGREES

BELOW NORMAL...THOSE WAITING FOR THE TRUE APPEARANCE OF SUMMER WOULD

ONLY HAVE TO WAIT UNTIL SOME KIDS RETURNED TO SCHOOL. THE FINAL WEEK

OF AUGUST WAS THE 4TH WARMEST ON RECORD...AVERAGING A HIGH OF 91.1

DEGREES AND LOW OF 70.7 DEGREES.  A RECORD HIGH MINIMUM OF 76

DEGREES WAS RECORDED ON THE 25TH. A NIGHTTIME THUNDERSTORM EARLY

ON THE 22ST PRODUCED 1.39 INCHES OF RAINFALL ALONG WITH WIND GUSTS

TO 44 MPH.

 

SUMMER 2013 /JUNE THROUGH AUGUST/ WAS THE 16TH DRIEST WITH 6.80

INCHES PRECIPITATION. TEMPERATURES WERE FAIRLY CLOSE TO NORMAL WITH

A MEAN OF 72.1 DEGREES. EVEN WITH THE LACK OF PRECIPITATION...THE

MODEST TEMPERATURES OVERALL KEPT DROUGHT CONDITIONS FROM WORSENING

DURING THE SUMMER.

 

THE MONTH OF SEPTEMBER BROUGHT THE FIRST...AND ONLY...SOLIDLY ABOVE

NORMAL TEMPERATURES OF THE YEAR. ONLY 6 DAYS OF THE MONTH WERE BELOW

NORMAL...AND OF THOSE...ONLY TWO WERE MORE THAN 5 DEGREES BELOW

NORMAL. THE MONTH ENDED AS THE 11TH WARMEST SEPTEMBER ON RECORD.

LESS THAN HALF OF NORMAL PRECIPITATION FELL FOR THE MONTH...AND MOST

OF THAT WAS IN THE FIRST WEEK OF THE MONTH.

 

CERTAINLY THE MOST SIGNIFICANT WEATHER EVENT DURING 2013 OCCURRED

DURING THE MONTH OF OCTOBER. A VERY LATE SEASON TORNADO OUTBREAK

OCCURRED ON OCTOBER 4 ACROSS SIOUXLAND...WITH OVER A DOZEN TORNADOES

REPORTED...AND PRODUCING A PAIR OF LONG TRACK EF4 TORNADOES. ONE OF

THESE STRUCK THE COMMUNITY OF WAYNE NEBRASKA...AND A SECOND TOUCHED

DOWN NEAR CLIMBING HILL...TRAVELLING NORTHEAST FOR 25 MILES BEFORE

LIFTING WEST OF WASHTA. THE MAXIMUM INTENSITY OF THIS TORNADO

OCCURRED WHILE IT WAS JUST SOUTHEAST OF PIERSON.

 

OTHERWISE...THE WARM WEATHER EARLY IN THE MONTH WAS BALANCED BY SOME

LATE MONTH COOLING FOR A NEAR NORMAL TEMPERATURE. THE FIRST FREEZE

OF THE FALL OCCURRED ON THE 13TH...ALTHOUGH SOME PATCHY FROST WAS

NOTED AROUND THE AREA WITH LOWS JUST ABOVE FREEZING ON SEPTEMBER 21.

HEAVY RAINFALL OF 2.31 INCHES ON THE 14TH /4TH ALL TIME WETTEST

OCTOBER DAY/ HELPED PUSH THE MONTH TO BEING THE 8TH WETTEST ON

RECORD. THE FIRST SNOWFALL OF THE YEAR OCCURED ON THE 23RD...WITH

A TRACE.

 

MOST OF THE PRECIPITATION FOR NOVEMBER WAS RECORDED ON THE 5TH...

WHEN 0.92 INCHES AND 0.5 INCHES SNOW FELL AT SIOUX GATEWAY AIRPORT.

OTHERWISE...THE MONTH WAS AGAIN DRIER AND LESS SNOWY THAN NORMAL.

A WARM MID MONTH PERIOD WAS BRACKETED BY MUCH COOLER THAN NORMAL

TEMPERATURES ON EACH SIDE. THE WARMEST READING OF THE MONTH OCCURRED

ON THE 19TH AT 62 DEGREES...AND THIS WAS FOLLOWED A WEEK LATER WITH

THE COOLEST READINGS OF THE MONTH AT 4 DEGREES ON THE 27TH. THE VERY

CHILLY AIR BUILDING SOUTHWARD JUST BEFORE THANKSGIVING MADE FOR THE

FIRST DAY FAILING TO REACH FREEZING ON THE 22ND. THE STRONG HIGH

PRESSURE AREA BRINGING THE COLD AIR RESULTED IN A RECORD HIGH

PRESSURE FOR THE MONTH OF NOVEMBER ON THE 23RD AT 30.96 INCHES.

 

DECEMBER 2013...WHILE RANKING OUTSIDE THE TOP 10 COLDEST...MIGHT

HAVE FINISHED AS SUCH IF NOT FOR A RUN OF MILD TEMPERATURES RIGHT

AFTER CHRISTMAS...RESULTING IN A PAIR OF RECORD HIGH TEMPERATURES

LATE IN THE MONTH ON THE 27TH AND 28TH /59 AND 62 RESPECTIVELY/.

THE MONTH FEATURED SOME DRASTIC CHANGES IN TEMPERATURES WITH

PERIODIC ARCTIC AIR INTRUSIONS NOT SEEN FOR SEVERAL YEARS THIS

EARLY IN THE SEASON. THE FIRST BELOW ZERO READING WAS REPORTED ON

THE 6TH...WHICH WAS ABOUT A WEEK EARLIER THAN THE AVERAGE DATE OVER

THE PERIOD OF RECORD. THE DRY CONDITIONS OF LATER NOVEMBER PERSISTED

THROUGH DECEMBER...ENDING UP 10TH DRIEST AT 0.18 INCHES.  ONLY 2.3

INCHES OF SNOW FELL IN DECEMBER IN SIOUX CITY. AND OVERALL...IT WAS

A DRY AND FAIRLY SNOWLESS START TO THE 2013-2014 WINTER...WITH

SNOWFALL 9 INCHES BELOW NORMAL IN NOVEMBER AND DECEMBER.

 



Return to Latest News

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