NOUS42 KMLB 011402
PNSMLB
FLZ041-044>047-053-054-058-059-064-141-144-147-020000-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
902 AM EST SAT JAN 1 2011

...EXTREME COLD AIR OUTBREAKS LEAD TO THE COLDEST DECEMBER ON RECORD 
FOR EAST CENTRAL FLORIDA...
...RAINFALL WAS ALSO WELL BELOW NORMAL FOR DECEMBER 2010...

A SERIES OF STRONG COLD FRONTS THAT BROUGHT NUMEROUS NIGHTS OF 
FREEZING TEMPERATURES TO THE AREA THIS MONTH LEAD TO THE COLDEST 
DECEMBER ON RECORD. LITTLE RAINFALL ACCOMPANIED THESE BOUNDARIES 
WHICH ALSO LEAD TO WELL BELOW NORMAL RAINFALL ACROSS THE AREA.   

.TEMPERATURES...

ABOVE NORMAL TEMPERATURES EXPERIENCED ACROSS THE AREA DURING LATE 
NOVEMBER WERE ENDED BY THE 1ST OF THE MONTH AS THE FIRST OF A SERIES 
OF STRONG FRONTS CROSSED THE AREA. ADDITIONAL COLD FRONTS CROSSED 
THE AREA ON THE 5TH...12TH...18/19TH...AND 25/26TH WHICH REINFORCED 
BELOW NORMAL TEMPERATURES FOR MOST OF THE MONTH. THREE SEPARATE 
FREEZE EVENTS WERE EXPERIENCED THIS DECEMBER DUE TO THE VERY 
UNSEASONABLE COLD AIR BEHIND THESE BOUNDARIES. THESE EVENTS TOOK 
PLACE ON THE MORNINGS OF THE 7-8TH...14-16TH...AND 27-29TH. ONE OF 
THE EARLIEST HARD FREEZES (MINIMUM TEMPERATURES BELOW 28 DEGREES) TO 
OCCUR ON RECORD FOR DECEMBER WAS OBSERVED DURING THE 14TH AND 15TH 
WITH HARD FREEZES OBSERVED AGAIN ON THE 28TH AND 29TH. 

DAILY AVERAGE TEMPERATURE DEPARTURES REMAINED BELOW NORMAL ALMOST 
EVERY SINGLE DAY WITH DEPARTURES AS HIGH 15 TO 25 DEGREES BELOW 
NORMAL OCCURRING ON SEVERAL DAYS. IN ADDITION...NUMEROUS RECORD LOWS 
AND COOL HIGHS WERE BROKEN THROUGHOUT THE MONTH. IN THE END MONTHLY 
AVERAGE TEMPERATURE DEPARTURES ACROSS EAST CENTRAL FLORIDA WERE 9 
TO 11 DEGREES BELOW NORMAL. THESE AVERAGE TEMPERATURE VALUES NOT 
ONLY SET THIS DECEMBER AS THE COLDEST ON RECORD...BUT SHATTERED THE 
PREVIOUS COLDEST DECEMBER RECORDS BY A WHOLE 2 TO 4 DEGREES. RECORDS 
FOR THE FOUR MAIN CLIMATE SITES IN THE AREA GO AS FAR BACK AS THE 
EARLY 20S...HOWEVER EVEN COOP SITES THAT HAVE DATA EXTENDING BACK 
INTO THE EARLY 1900S SUCH AS TITUSVILLE...FORT PIERCE AND DELAND 
EXPERIENCED THEIR COLDEST DECEMBER ON RECORD BY A LARGE MARGIN. 

THE MAIN CONTRIBUTING FACTOR FOR THESE WELL BELOW NORMAL  
TEMPERATURES DURING DECEMBER WAS A PERSISTENT AND STRONG NEGATIVE 
PHASE OF THE NORTH ATLANTIC OSCILLATION. THE NEGATIVE PHASE OF THE 
NORTH ATLANTIC OSCILLATION TYPICALLY BRINGS MORE COLD AIR OUTBREAKS 
ALONG THE CENTRAL AND EASTERN UNITED STATES.      

THE OVERALL MONTHLY AVERAGE TEMPERATURE VALUES FOR THE FOUR MAIN 
CLIMATE SITES ACROSS EAST CENTRAL FLORIDA ARE AS FOLLOWS:

-DAYTONA BEACH HAD AN AVERAGE MONTHLY TEMPERATURE OF 50.1 DEGREES 
FAHRENHEIT WHICH WAS 10.7 DEGREES BELOW NORMAL. THIS IS THE COLDEST 
DECEMBER ON RECORD FOR THIS SITE. (RECORDS GO BACK TO 1923) 

-ORLANDO HAD AN AVERAGE MONTHLY TEMPERATURE OF 52.0 DEGREES 
FAHRENHEIT WHICH WAS 11.0 DEGREE BELOW NORMAL. THIS IS THE COLDEST 
DECEMBER ON RECORD FOR THIS SITE. (RECORDS GO BACK TO 1948) 

-MELBOURNE HAD AN AVERAGE MONTHLY TEMPERATURE OF 54.0 DEGREES 
FAHRENHEIT WHICH WAS 9.3 DEGREES BELOW NORMAL. THIS IS THE COLDEST 
DECEMBER ON RECORD FOR THIS SITE. (RECORDS GO BACK TO 1937) 

-VERO BEACH HAD AN AVERAGE MONTHLY TEMPERATURE OF 53.9 DEGREES 
FAHRENHEIT WHICH WAS 10.8 DEGREES BELOW NORMAL. THIS IS THE COLDEST 
DECEMBER ON RECORD FOR THIS SITE. (RECORDS GO BACK TO 1942) 

TOP 5 COLDEST DECEMBER AVERAGE TEMPERATURE RANKINGS IN DEGREES 
FAHRENHEIT AND LAST YEAR SET:

   DAYTONA          ORLANDO       MELBOURNE     VERO BEACH  
 1. 50.1  2010   1. 52.0  2010  1. 54.0  2010  1. 53.9  2010 
 2. 52.7  1935   2. 55.5  1989  2. 56.2  1989  2. 58.1  1989
 3. 53.3  1989   3. 56.5  1963  3. 58.3  1950  3. 59.2  1969
 4. 54.1  1960   4. 57.2  1954  4. 58.4  1968  4. 59.3  1963
 5. 54.7  1950   5. 57.5  1960  5. 58.6  1969  5. 59.5  1962 

DATA FROM CO-OPERATIVE STATIONS* IN EAST CENTRAL FLORIDA:         

            DECEMBER (AVERAGE TEMPERATURE AND RANKING)           

CLERMONT    50.6 - COLDEST  (DATA GOES BACK TO 1948)     

DELAND      47.8*- COLDEST  (DATA GOES BACK TO 1900)            

TITUSVILLE  51.7 - COLDEST  (DATA GOES BACK TO 1901)               

SANFORD     51.4 - COLDEST  (DATA GOES BACK TO 1948)                              

OKEECHOBEE  51.9*- COLDEST  (DATA GOES BACK TO 1945)           

FT. PIERCE  53.7 - COLDEST  (DATA GOES BACK TO 1901)               

STUART      54.4 - COLDEST  (DATA GOES BACK TO 1936)           

*NOTE: RANKINGS FROM CO-OPERATIVE STATIONS MAY BE LESS RELIABLE DUE 
TO MISSING DATA. (AVERAGES FOR DELAND AND OKEECHOBEE WERE MISSING 
DATA FROM THE 31ST, WHICH WOULD LIKELY MAKE THE AVERAGE TEMPERATURES 
SLIGHTLY HIGHER THAN THESE NUMBERS REFLECT).

.RAINFALL...

THE NUMEROUS COLD FRONTS THAT CROSSED THE AREA DURING THE MONTH 
BROUGHT LITTLE IN THE WAY OF PRECIPITATION. THIS IS NOT UNUSUAL AS 
LA NINA CONDITIONS CURRENTLY OBSERVED OVER THE EQUATORIAL PACIFIC 
WATERS TYPICALLY BRING DRIER THAN NORMAL CONDITIONS OVER FLORIDA 
DURING THE WINTER SEASON. THE MOST SIGNIFICANT RAINFALL EVENT 
OCCURRED AHEAD OF THE COLD FRONT THAT CROSSED THE AREA LATE ON THE 
18TH. SEVERAL LOCATIONS OBSERVED A QUARTER TO A HALF INCH OF 
RAINFALL WITH A HEAVIER BAND OF PRECIPITATION OCCURRING FROM 
OKEECHOBEE TO SOUTHERN BREVARD AND INDIAN RIVER COUNTIES. LOCALLY 
HEAVY RAINFALL AMOUNTS UP TO 1.5 TO 2 INCHES WERE REPORTED ALONG 
THIS BAND WITH MELBOURNE BREAKING A DAILY RAINFALL RECORD WHEN IT 
RECEIVED 1.87 INCHES. 

OVERALL ACROSS THE AREA...RAINFALL DEFICITS OF 1 TO 2 INCHES WERE 
GENERALLY OBSERVED FOR THE MONTH. 

THE OVERALL RAINFALL TOTALS FOR THE FOUR MAIN CLIMATE SITES ACROSS 
EAST CENTRAL FLORIDA ARE AS FOLLOWS (RANKINGS PROVIDED IF IN THE TOP 
10):

-DAYTONA BEACH RECEIVED 0.38 INCHES OF RAINFALL WHICH WAS 2.33 
INCHES BELOW NORMAL. THIS IS 8TH DRIEST DECEMBER ON RECORD FOR THIS 
SITE.  

-ORLANDO RECEIVED 0.78 INCHES OF RAINFALL WHICH WAS 1.53 INCHES BELOW 
NORMAL. 

-MELBOURNE RECEIVED 1.95 INCHES OF RAINFALL WHICH WAS 0.36 INCHES 
BELOW NORMAL. 

-VERO BEACH RECEIVED 0.56 INCHES OF RAINFALL WHICH WAS 1.63 INCHES 
BELOW NORMAL.   

BELOW IS A LIST OF OBSERVED PRECIPITATION TOTALS AND RAINFALL
STATISTICS FOR SELECT SITES ACROSS EAST CENTRAL FLORIDA FOR DECEMBER 
2010: 

STATION           DEC 2010      30 YEAR   DEPARTURE     PERCENT OF 
                  RAINFALL      NORMAL    FROM NORMAL     NORMAL

DAYTONA BEACH      0.38"         2.71"      -2.33"          14%
(DAB)
ORLANDO            0.78"         2.31"      -1.53"          34%
(MCO)
MELBOURNE          1.95"         2.31"      -0.36"          84% 
(MLB)
VERO BEACH         0.56"         2.19"      -1.63"          26%
(VRB)
CLERMONT           0.75"         2.40"      -1.65"          31%
(CLRF1)
DELAND             0.29"         2.65"      -2.36"          11% 
(DELF1)
SANFORD            0.15"         2.53"      -2.38"           6% 
(SFNF1)
TITUSVILLE         0.32"         2.52"      -2.20"          13% 
(TITF1)
FORT PIERCE        0.39"         2.28"      -1.89"          17% 
(FPCF1)
OKEECHOBEE         0.71"         2.28"      -1.57"          31% 
(OKEF1)
STUART             0.70"         2.78"      -2.08"          25% 
(STRF1)

FOR MORE LOCAL CLIMATE INFORMATION...PLEASE VISIT OUR WEB PAGE AT
HTTP://WEATHER.GOV/MELBOURNE AND CLICK ON THE "LOCAL" LINK UNDER THE
CLIMATE SUBSECTION ON THE LEFT SIDE OF THE PAGE.

$$

WEITLICH/GLITTO

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