2008 Climatic Summary for Sioux City

SIOUX CITY AREA CLIMATIC SUMMARY FOR 2008
NATIONAL WEATHER SERVICE SIOUX FALLS SD
950 PM CST WED DEC 31 2008

...2008 BELOW NORMAL IN TEMPERATURE FOR THE FIRST TIME IN OVER 10
YEARS...

TEMPERATURES AVERAGED 46.3 DEGREES FOR 2008...OR 2.0 DEGREES BELOW
THE NORMAL OF 48.3 DEGREES. THIS WAS THE FIRST YEAR SINCE 1997 THAT
HAS AVERAGED BELOW NORMAL...AND TIED 1924 FOR THE 9TH COOLEST YEAR
ON RECORD. ALL MONTHS WERE BELOW NORMAL IN TEMPERATURE IN 2008
EXCEPT THE FALL MONTHS OF SEPTEMBER...OCTOBER...AND NOVEMBER.
IT WAS ANOTHER WET YEAR IN SIOUXLAND IN 2008...TOTALING 31.64 INCHES
AT THE SIOUX GATEWAY AIRPORT...OR 5.65 INCHES ABOVE NORMAL. OUT OF
THE PAST 18 YEARS...ONLY 5 YEARS OR 28 PERCENT HAD BELOW NORMAL
PRECIPITATION...AND THE 18 YEAR AVERAGE OF 28.10 INCHES WAS ABOUT
2 INCHES ABOVE THE OFFICIAL 30 YEAR NORMAL OF 25.99 INCHES. SNOWFALL
FOR THE 2007/08 SEASON WAS 43.8 INCHES...OR 12.4 INCHES ABOVE
NORMAL...WITH 37.1 INCHES OF THIS OCCURRING FROM DECEMBER TO
FEBRUARY.

THE FOLLOWING IS A CHRONOLOGICAL ACCOUNT OF THE WEATHER EVENTS OF
2008 IN SIOUXLAND...

JANUARY 20/21ST...THERE WAS A TOTAL OF 9.7 INCHES SNOWFALL...OR 8.0
INCHES WITHIN A 24 HOUR PERIOD FOR THE SECOND BIGGEST SNOWFALL OF
THE YEAR.

JANUARY 24TH...THE MINIMUM TEMPERATURE OF 20 BELOW ZERO WAS THE
LOWEST TEMPERATURE OF 2008...WITH 19 BELOW ZERO ON DECEMBER 22ND
LATE IN THE YEAR A CLOSE SECOND.

JANUARY 29TH...STRONG NORTHWEST WINDS GUSTED TO 55 MPH AT 625 AM...
USHERING IN MUCH COLDER AIR FOR THE DAY. WIND CHILLS DROPPED TO 25
BELOW ZERO AT 11 AM FOR THE COLDEST DAYTIME WIND CHILLS SINCE THE
PREVIOUS JANUARY.

FEBRUARY 20TH...THE LOWEST WIND CHILL OF THE WINTER SEASON OF 33
BELOW ZERO WAS RECORDED AT 4 TO 5 AM IN THE MORNING.

MARCH 27TH...3.6 INCHES OF SNOW WAS MEASURED...FOR THE LAST SNOWFALL
OF THE SEASON OVER A HALF INCH.

APRIL 10/11TH...1.84 INCHES OF RAIN WAS RECORDED...FOR THE FIRST
HEAVY RAIN EVENT OF THE YEAR.

APRIL 15TH...IT WAS A WARM AND VERY WINDY DAY WITH SOUTH WINDS
GUSTING AS HIGH AS 55 MPH AT 432 PM CDT.

MAY 29TH...THUNDERSTORMS PRODUCED 1.52 INCHES OF RAIN...AND SOUTH
WINDS GUSTED TO 56 MPH AT 802 PM CDT. MAY ENDED UP WITH A TOTAL OF
5.20 INCHES PRECIPITATION...FOR THE WETTEST MONTH OF THE YEAR.

JUNE 4/5TH...THUNDERSTORMS BROUGHT STRONG WINDS...HAIL...AND AN
AIRPORT TOTAL OF 1.18 INCHES RAIN. WINDS GUSTED TO 56 MPH AT 1045 PM
CDT LATE ON THE 4TH...AND HAIL UP TO ONE INCH IN DIAMETER FELL IN
THE AREA AROUND 1230 PM CDT IN THE EARLY AFTERNOON OF THE 5TH.

JULY 6TH...HEAVY RAIN FROM THUNDERSTORMS CAUSED FLASH FLOODING OF
SEVERAL STREETS IN THE INDIAN HILLS AREA OF SIOUX CITY AROUND 6 PM
CDT. HOWEVER...ONLY 0.50 INCH OF RAIN OCCURRED AT THE SIOUX CITY
AIRPORT.

JULY 19/21ST...SEVERE WEATHER STRUCK THE AREA...AND RAINFALL TOTALED
2.66 INCHES IN THREE DAYS AT THE AIRPORT. BETWEEN 7 AND 730 PM CDT
ON THE 19TH...HAIL UP TO AN INCH IN DIAMETER WITH WIND GUSTS AROUND
60 MPH WERE REPORTED IN THE AREA. THEN VERY EARLY ON THE 21ST
BETWEEN 1230 AND 100 AM CDT SEVERE THUNDERSTORMS CAUSED WIDESPREAD
DAMAGE IN AND NEAR SIOUX CITY. TREE DAMAGE INCLUDED LARGE TREES
BLOWN DOWN...BLOCKING SEVERAL ROADS. A FEW VEHICLES WERE DESTROYED
AND NUMEROUS VEHICLES DAMAGED BY FALLING TREES AND TREE DEBRIS.
FALLING TREES ALSO DAMAGED SEVERAL RESIDENCES AND GARAGES...CAUSING
ONE KNOWN INJURY. NUMEROUS BUILDINGS...ESPECIALLY RESIDENCES...
SUSTAINED ROOF AND SHINGLE DAMAGE. POWER LINES AND POLES WERE BLOWN
DOWN OR BROKEN...LEAVING AN ESTIMATED 19000 CUSTOMERS WITHOUT POWER.
OFFICIALLY AT THE AIRPORT...74 MPH WINDS WERE RECORDED AT 1239 AM
FOR THE STRONGEST WIND OF THE YEAR.

AUGUST 3RD...THE DAILY MAXIMUM OF 96 DEGREES WAS THE HOTTEST
TEMPERATURE OF 2008. HOWEVER...THIS WAS ONLY THE 4TH...AND ALSO THE
LAST...90 DEGREE DAY OF THE YEAR. THIS YEAR TIES 1915 FOR THE SECOND
LEAST NUMBER OF DAYS OF 90 DEGREES PLUS. 1915 ALSO HAD THE COLDEST
SUMMER ON RECORD. THE LEAST NUMBER OF 90 PLUS DAYS ON RECORD WAS
ONLY THREE IN 1992...WHICH ALSO WAS THE 2ND COLDEST SUMMER ON
RECORD. THE NORMAL NUMBER OF 90 DEGREE PLUS DAYS A YEAR IS 25 FOR
SIOUX CITY.

AUGUST 27/28TH...THUNDERSTORMS PRODUCED 1.77 INCHES OF RAIN WITHIN A
24 HOUR PERIOD AT THE AIRPORT.

OCTOBER 22/23RD...HEAVY RAIN BROUGHT 2.53 INCHES OF RAIN WITHIN A
24 HOUR PERIOD FOR THE HEAVIEST OFFICIAL PRECIPITATION EVENT OF THE
YEAR. OCTOBER ENDED UP WITH 4.61 INCHES PRECIPITATION...FOR THE 5TH
WETTEST OCTOBER ON RECORD.

OCTOBER 26TH...A STRONG NORTHWEST WIND GUST OF 56 MPH WAS RECORDED
AT THE AIRPORT AT 936 AM CDT.

NOVEMBER 3RD...THE DAILY HIGH OF 80 DEGREES WAS JUST ONE DEGREE
SHORT OF THE RECORD HIGH FOR THE DATE.

DECEMBER 16/19TH...5.3 INCHES SNOWFALL ON THE 16TH WAS FOLLOWED BY
10.3 INCHES SNOWFALL WITHIN 24 HOURS ON THE 18/19TH...FOR THE
BIGGEST SNOWFALL OF THE YEAR. THIS MADE A SNOW DEPTH OF 16 INCHES AT
THE SIOUX CITY AIRPORT. THE TOTAL DECEMBER SNOWFALL OF 22.6 INCHES
WAS THE 2ND SNOWIEST DECEMBER ON RECORD...COMPARED TO THE RECORD OF
26.4 INCHES IN 1897.

THE FOLLOWING TABLES GIVE A MONTH BY MONTH BREAKDOWN OF WEATHER IN
2008 AT THE SIOUX CITY AIRPORT...

TEMPERATURES
                 AVERAGE             DEPARTURE  EXTREMES    MONTHLY
MONTH          MAX   MIN   MONTHLY  FROM NORM  HIGH LOW    RECORDS

JANUARY        25.5   5.4     15.5   MINUS 3.1   46  20B
FEBRUARY       27.9   8.0     17.9   MINUS 7.2   45  13B
MARCH          42.9  23.3     33.1   MINUS 3.4   60   5B
APRIL          57.6  34.0     45.8   MINUS 3.7   79  20
MAY            70.8  46.1     58.5   MINUS 2.7   86  33
JUNE           81.8  57.1     69.4   MINUS 1.1   90  48
JULY           85.5  63.6     74.5   MINUS 0.1   92  52
AUGUST         83.8  59.5     71.6   MINUS 0.5   96  49
SEPTEMBER      76.3  51.0     63.7    PLUS 0.6   88  38
OCTOBER        64.6  39.2     51.9    PLUS 1.1   81  20   5TH WETTEST
NOVEMBER       46.6  26.2     36.4    PLUS 1.6   80   5
DECEMBER       28.3   5.6     17.0   MINUS 5.3   54  19B 2ND SNOWIEST

2008          57.6  34.9     46.3   MINUS 2.0   96  20B

NORMAL YEAR    59.5  37.0     48.3

PRECIPITATION...INCHES
                   DEPARTURE            DEPARTURE   MAX WIND GUSTS...
   MONTH           FROM NORM  SNOWFALL  FROM NORM  DIRECTION/MPH/DATE

JANUARY     .73    PLUS  .14    14.5     PLUS 8.2      NW 55 ON 29TH
FEBRUARY    .81    PLUS  .19    10.4     PLUS 4.9      NW 47 ON 9TH
MARCH      1.23   MINUS  .77     6.0     PLUS 0.2      NW 48 ON 12TH
APRIL      2.79    PLUS  .04     0.7    MINUS 1.2       S 55 ON 15TH
MAY        5.20    PLUS 1.45      0                     S 56 ON 29TH
JUNE       3.35   MINUS  .26      0                    NE 56 ON 4TH
JULY       4.39    PLUS 1.09      0                     N 74 ON 20TH
AUGUST     2.67   MINUS  .23      0                     N 39 ON 12TH
SEPTEMBER  3.34    PLUS  .92      0                     N 38 ON 14TH
OCTOBER    4.61    PLUS 2.62      0     MINUS 0.8      NW 56 ON 26TH
NOVEMBER   1.06   MINUS  .34     2.9    MINUS 1.9      NW 41 ON 14TH
DECEMBER   1.46    PLUS  .80    22.6    PLUS 16.3      NW 54 ON 14TH

2008     31.64    PLUS 5.65    57.1    PLUS 25.7       N 74 JUL 20TH

RICHARD S. RYRHOLM...CLIMATIC FOCAL POINT




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