Juneau Annual Climate Summary for 2009

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CXAK57 PAJK 212054
CLMAJK

CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK                                  
1150 AM AKST THU JAN 21 2010

...A NEAR NORMAL YEAR WITH SOME TREMENDOUS VARIABILITY...

THE YEAR 2009 WAS...ALL AROUND...A YEAR OF NEAR NORMAL CONDITIONS.
AVERAGE MAXIMUM AND MINIMUM TEMPERATURES WERE BOTH WITHIN ABOUT 0.5
DEGREES OF NORMAL AND THE ANNUAL PRECIPITATION OF 59.43 INCHES WAS ONLY
1.2 INCHES ABOVE NORMAL. CALENDAR YEAR SNOWFALL...ON THE OTHER
HAND...MEASURED OUT AT 168.5 INCHES. THIS WAS SLIGHTLY MORE THAN 75
INCHES...OR NEARLY 81 PERCENT...ABOVE THE NORMAL CALENDAR YEAR AMOUNT
AND LARGELY DUE TO HEAVY SNOWS EARLY IN THE YEAR. APART FROM
SNOWFALL...THE NEAR NORMAL CONDITIONS HIDE SOME TREMENDOUS VARIABILITY
THAT MADE 2009 A MEMORABLE WEATHER YEAR.

WINTER: THE YEAR BEGAN WITH JUNEAU IN THE MIDST OF AN EXCEPTIONALLY
SNOWY WINTER. JANUARY PROVED TO BE A ROCKY RIDE IN TERMS OF
TEMPERATURES WITH WELL BELOW NORMAL VALUES FOR THE FIRST
WEEK...INCLUDING THE COLDEST NIGHT OF THE YEAR ON JANUARY 7TH  WHEN THE
MERCURY FELL TO 9 DEGREES BELOW ZERO AND NEARLY SET A RECORD.
TEMPERATURES REBOUNDED TO WELL ABOVE NORMAL DURING THE SECOND WEEK AND
REMAINED THERE THROUGH THE THIRD WEEK. DURING THIS TIME...A RECORD HIGH
TEMPERATURE OF 53 DEGREES WAS SET ON THE 18TH AND IS THE THIRD WARMEST
JANUARY DAY ON FILE FOR JUNEAU. TEMPERATURES THEN PLUMMETED BELOW
NORMAL AGAIN FOR THE LAST WEEK OF THE MONTH. THE MONTH ALSO SAW OVER 75
INCHES OF SNOW...A VALUE THAT IS 160 PERCENT MORE THAN NORMAL. 51 OF
THOSE INCHES FELL IN THE FIRST 10 DAYS OF THE YEAR. THE TEMPERATURE
ROLLER COASTER CONTINUED IN THE FIRST HALF OF FEBRUARY WITH VALUES
INITIALLY ABOVE NORMAL...AND THEN WELL BELOW NORMAL FOR THE FIRST HALF
OF THE MONTH. HEAVY SNOW FOR THE WINTER CONTINUED WITH MORE THAN 30
INCHES ACCUMULATIONS...A FULL FOOT ABOVE NORMAL FOR THE MONTH.
INTERESTINGLY...NEARLY ALL OF THE PRECIPITATION IN FEBRUARY FELL IN THE
FIRST ELEVEN DAYS. THEREAFTER...ONLY 2.5 MORE INCHES FELL. 

SPRING: TEMPERATURES ENDED BELOW NORMAL IN FEBRUARY AND THAT SAME TREND
CONTINUED FOR THE ENTIRE MONTH OF MARCH. FOR THE MONTH THE DAILY HIGH
AND LOW AVERAGED A FULL 5 DEGREES BELOW NORMAL...QUITE A SIGNIFICANT
DEPARTURE FROM NORMAL. SNOWFALL CONTINUED TO RUN ABOVE NORMAL WITH OVER
31 INCHES BEING RECORDED AT THE AIRPORT...WHICH IS A FULL 3 TIMES THE
NORMAL MONTHLY AMOUNT. APRIL SAW THE LAST SNOW OF THE SEASON WITH A
TRACE BEING REPORTED ON THE NINTH AND SLIGHTLY MORE THAN 2 INCHES TOTAL
FOR THE MONTH. TOTAL PRECIPITATION...HOWEVER...CAME OUT MORE THAN THREE
QUARTERS OF AN INCH BELOW NORMAL AND FORESHADOWED A TREND FOR A
MAJORITY OF THE SUMMER. BELOW NORMAL TEMPERATURES WERE SLOW TO RESPOND
TO THE LENGTHENING DAYS AND FOR THE FIRST HALF OF THE MONTH DAYTIME
HIGHS LAGGED BELOW NORMAL. APRIL ENDED IN A GLORIOUS FASHION WITH
DAYTIME HIGHS IN THE LOW 60S AND SUNNY WEATHER. MAY BEGAN VERY WARM AND
DRY WITH THE WARMEST DAY OF THE MONTH OCCURRING ON THE SECOND WHEN THE
TEMPERATURE ROSE TO 75 DEGREES. DAYTIME HIGHS FOR THE MONTH WERE
GENERALLY ABOVE NORMAL AND THERE WERE MANY PARTLY CLOUDY OR SUNNY DAYS.
THE SAME CLEAR WEATHER RESULTED IN NIGHTTIME LOWS BELOW NORMAL VALUES.
THE LAST FREEZING NIGHT OF THE SEASON OCCURRED ON THE 19TH.
PRECIPITATION WAS LIMITED TO THE FIRST AND LAST WEEKS OF THE MONTH WITH
ONLY 2 RAINY DAYS MID MONTH. THE DRY WEATHER RESULTED IN A RAINFALL
DEFICIT OF MORE THAN THREE QUARTERS OF AN INCH. 

SUMMER: JUNEAU BEGAN ON A VERY WARM NOTE WITH THE TEMPERATURE RISING TO
79 DEGREES ON JUNE 2ND...TYING THE RECORD FOR THIS DATE THAT WAS SET
BACK IN 1954. THE ENTIRE FIRST WEEK OF JUNE WAS QUITE WARM AND ENTIRELY
DRY WITH DAYTIME HIGHS RANGING 13 TO 19 DEGREES ABOVE NORMAL. THE DRY
SPELL CONTINUED INTO THE SECOND WEEK AND IT WAS NOT UNTIL JUNE 12TH
THAT ANY RAIN FELL. THEREAFTER...TEMPERATURES RAN 3 TO 5 DEGREES BELOW
NORMAL FOR THE REMAINDER OF THE MONTH AND IT RAINED FOR MOST OF THE
REMAINING DAYS IN JUNE. STILL...JUNE POSTED ANOTHER RAINFALL DEFICIT OF
SLIGHTLY MORE THAN ONE HALF INCH. JULY WAS DOWNRIGHT HOT BY SOUTHEAST
ALASKA STANDARDS. MONTHLY DAYTIME AVERAGE HIGH TEMPERATURES WERE NEARLY
6 DEGREES ABOVE NORMAL AND MADE THIS THE 3RD WARMEST JULY ON RECORD.
THE MID SUMMER WARMTH CONTINUED UNINTERRUPTED FOR A FULL 2 WEEKS
AND...APART FROM JULY 1ST...WAS COMPLETELY DRY. THREE DAILY TEMPERATURE
RECORDS WERE BROKEN DURING THE MONTH AND THE WARMEST DAY OF THE YEAR
OCCURRED ON JULY 6TH WHEN THE AIRPORT RECORDED 85 DEGREES AND SEVERAL
UNOFFICIAL SITES REPORTED TEMPERATURES AS HIGH AS 90 DEGREES. THE ALL
TIME HIGHEST TEMPERATURE EVER RECORDED AT THE AIRPORT WAS 90 DEGREES
BACK IN JULY OF 1975. TEMPERATURES FELL BACK DOWN TO NORMAL OR BELOW
NORMAL VALUES BETWEEN THE 15TH AND THE 23RD WHICH IS ALSO WHEN NEARLY
ALL OF THE RAIN FOR THE MONTH FELL. THIS MID-MONTH RAIN WAS A WELCOME
RELIEF TO SOME AS THE SURROUNDING FORESTS WERE BECOMING VERY DRY AND
THE DANGER FROM WILDFIRES WAS BECOMING VERY SERIOUS. IN THE END...JULY
PRECIPITATION WAS MORE THAN 1 AND THREE QUARTERS OF AN INCH...OR 56
PERCENT...BELOW NORMAL AND JUNEAU WAS EXPERIENCING A CUMULATIVE
PRECIPITATION DEFICIT. THE DRY TREND CONTINUED INTO AUGUST AND BY
MID-MONTH JUNEAU PRECIPITATION WAS 2 INCHES BELOW FOR THE YEAR TO DATE.
THE UNSEASONABLY WARM AND DRY WEATHER CONTINUED FOR THE FIRST WEEK OF
THE MONTH DURING WHICH TIME THE TEMPERATURE ROSE AS HIGH AS 80 DEGREES
UNDER HAZY SKIES WITH SMOKE FROM WILDFIRES FROM THE
INTERIOR...CANADA...GUSTAVUS OBSCURING THE CHILKAT MOUNTAINS FROM VIEW.
BY THE SECOND WEEK TEMPERATURES RETURNED TO NORMAL LEVELS. BY THE
BEGINNING OF THE THIRD WEEK, TEMPERATURES FELL BELOW NORMAL AND  THE
RAINS RETURNED. HEAVY RAIN IN THE MIDDLE OF THE MONTH RESULTED IN
FLOODING IN THE MENDENHALL VALLEY AND TWO DAILY RAINFALL RECORDS WERE
SET WHEN MORE THAN AN INCH OF RAIN FELL ON THE 17TH AND AGAIN ON THE
29TH. BY THE END OF AUGUST THE PRECIPITATION DEFICIT WAS OVER AND
CUMULATIVE PRECIPITATION WOULD REMAIN AT OR ABOVE NORMAL FOR THE
REMAINDER OF THE YEAR. 

AUTUMN: TEMPERATURES REBOUNDED BACK UP TO NORMAL AND REMAINED THERE FOR
THE ENTIRE MONTH WITH A SLOW BUT STEADY DECREASE IN DAILY HIGHS
ASSOCIATED WITH THE SHORTENING DAYS. THE FIRST HARD FREEZE OF THE
AUTUMN SEASON CAME ON THE NIGHT OF THE 29TH WHEN THE TEMPERATURE FELL
TO 27 DEGREES UNDER CLEAR SKIES. SEPTEMBER WAS ALSO QUITE WINDY. THERE
WERE 6 DAYS DURING THE MONTH WHEN THE AIRPORT RECORDED GUSTS IN EXCESS
OF 35 MPH...THE STRONGEST OF WHICH WAS 48 MPH ON THE 10TH. IN SOUTH
DOUGLAS...A GUST OF 56 MPH WAS RECORDED ON THE 5TH. OCTOBER WAS IN MOST
RESPECTS VERY TYPICAL. DAILY HIGHS WERE AT OR NEAR NORMAL VALUES AND
TRENDED DOWN AS THE DAYS GREW SHORTER. THERE WAS MORE VARIATION IN THE
OVERNIGHT LOWS WITH TEMPERATURES VARYING EQUALLY ABOVE AND BELOW NORMAL
BY AS MUCH AS 10 DEGREES FROM NIGHT TO NIGHT. THE SECOND WEEK OF THE
MONTH WAS ALMOST COMPLETELY DRY...WHICH IS MOST UNUSUAL FOR WHAT IS
TYPICALLY JUNEAUS WETTEST MONTH. IN THE END...ONLY 5.65 INCHES OF
PRECIPITATION FELL WHICH  REPRESENTS 68 PERCENT OF THE NORMAL OCTOBER
VALUE. THE FIRST SNOW OF THE SEASON ARRIVED NEAR THE END OF THE MONTH
WITH A TRACE RECORDED ON BOTH THE 29TH AND 30TH AND 0.2 INCHES IN THE
EARLY MORNING HOURS OF HALLOWEEN. SOUTHEAST ALASKA WAS HIT HARD IN
NOVEMBER BY NUMEROUS VERY STRONG STORM SYSTEMS THAT CAME IN FROM THE
GULF OF ALASKA. IN TOTAL...THERE WERE 9 DAYS WITH PEAK WINDS AT THE
AIRPORT OF 35 MPH OR GREATER. ONE STORM IN THE MIDDLE OF THE MONTH WAS
PARTICULARLY NOTEWORTHY. ON THE WEEKEND OF NOVEMBER 14TH...A 945 MB LOW
CROSSED THE NORTHERN GULF OF ALASKA AND PUSHED A FRONT ACROSS THE
PANHANDLE. THIS PARTICULARLY STRONG FRONT RESULTED IN HIGH
WINDS...HEAVY PRECIPITATION...AND SIGNIFICANT DAMAGE IN AND AROUND
JUNEAU. OVER 1.5 INCHES OF RAIN FELL BEFORE TURNING TO SNOW...AFTER
WHICH NEARLY 6 INCHES OF SNOW FELL. THE AIRPORT ALSO RECORDED THE
STRONGEST WIND OF THE YEAR AT 62 MPH. IN DOWNTOWN JUNEAU...MUDSLIDES
DAMAGED ROADS...HOMES...AND AUTOMOBILES. MORE SNOW FOLLOWED THE NEXT
WEEK WHEN ANOTHER 5.2 INCHES FELL THAT WEDNESDAY AND ANOTHER 3.3 INCHES
FELL THE FOLLOWING SATURDAY. IN THE END...MORE THAN 20 INCHES OF SNOW
FELL IN NOVEMBER WHICH IS NEARLY 8 INCHES ABOVE NORMAL. YET BY THE END
OF THE MONTH THERE WAS NO SNOW LEFT ON THE GROUND. IT RAINED AND/OR
SNOWED EVERY DAY IN THE MONTH OF NOVEMBER. 

WINTER: THE PRECIPITATION DID NOT LET UP IN THE BEGINNING OF DECEMBER
AND THE FIRST COMPLETELY DRY DAY WAS THE 4TH...ENDING A WET SPELL THAT
BEGAN BACK ON THE 15TH OF OCTOBER FOR A TOTAL OF 51 CONSECUTIVE WET
DAYS IN JUNEAU. TEMPERATURES FELL BELOW NORMAL DURING THE FIRST WEEK OF
THE MONTH AND REMAINED THERE UNTIL THE MIDDLE OF THE MONTH WHEN A 2-DAY
BREAK FROM THE COLD WEATHER BROUGHT MORE RAIN AND SNOW. THE SECOND OF
ONLY 2 SIGNIFICANT SNOWFALLS DURING THE MONTH OCCURRED ON DECEMBER 23RD
WHEN NEARLY 4 INCHES FELL. UNSEASONABLY WARM WEATHER AND CONTINUED
PRECIPITATION IN THE FORM OF RAIN QUICKLY MELTED THIS AND BY NEW YEARS
EVE THERE WAS...ONCE AGAIN...NO SNOW ON THE GROUND. IN THE
END...SLIGHTLY LESS THAN 4 INCHES TOTAL PRECIPITATION WAS RECORDED
WHICH WAS 28 PERCENT BELOW NORMAL. OF THAT...ONLY 9 INCHES OF SNOW FELL
IN DECEMBER WHEN NEARLY 21 INCHES IS MORE TYPICAL. 

...THE JUNEAU CLIMATE SUMMARY FOR THE YEAR OF 2009...

CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1943 TO 2010

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR'S         
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)      
                                          NORMAL                      
................................................................
TEMPERATURE (F)
RECORD
 HIGH              90   07/07/1975                                    
 LOW              -22   01/12/1972                                    
                        02/02/1968                                    
HIGHEST            85   07/06        78       7       76  08/20       
LOWEST             -9   01/07         2     -11       -8  02/08       
AVG. MAXIMUM     47.9              47.6     0.3     45.5              
AVG. MINIMUM     34.7              35.4    -0.7     34.7              
MEAN             41.2              41.5    -0.3     40.1              
DAYS MAX >= 90      0               0.0     0.0        0              
DAYS MAX <= 32     57              44.2    12.8       46              
DAYS MIN <= 32    154             127.5    26.5      136              
DAYS MIN <= 0       3               5.9    -2.9        5              

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        85.15   1991                                          
 MINIMUM        28.32   2001                                          

TOTALS          59.43             58.23    1.20    73.63              
DAILY AVG.       0.16              0.16    0.00     0.20              
DAYS >= .01       218             225.7    -7.7      256              
DAYS >= .10       138             142.5    -4.5      176              
DAYS >= .50        39              33.0     6.0       45              
DAYS >= 1.00       11               7.8     3.2       14              
GREATEST
 24 HR. TOTAL    1.53   11/13 TO 11/14           10/11 TO 10/12        
                                       
SNOWFALL (INCHES)
RECORDS
 TOTAL          212.1   1994                                          
 24 HR TOTAL     19.1   11/29/2006 TO 11/29/2006                      
 SNOW DEPTH        40   03/10/1972                                    

TOTALS          168.5              93.2    75.3    135.7              
 LIQUID EQUIV   16.85              9.32    7.53    13.57              
SINCE 7/1        29.4              34.1    -4.7     41.2              
 LIQUID 7/1      2.94              3.41   -0.47     4.12              
SNOWDEPTH AVG.      2                 2       0        0              
DAYS >= TRACE     103              78.6    24.4       91              
DAYS >= 1.0        38              25.1    12.9       37              
GREATEST
 SNOW DEPTH        33   01/11                         18  02/09       
                                                          02/10       
 24 HR TOTAL     14.3   01/08 TO 01/09           12/08 TO 12/09       

DEGREE_DAYS
HEATING TOTAL    8574              8574       0     8997              
 SINCE 7/1       3600              3780    -180     4051              
COOLING TOTAL       6                 3       3        0              
 SINCE 1/1          6                 3       3        0              

FREEZE DATES
RECORD
 EARLIEST     08/24/1969                                              
 LATEST       06/13/1965                                              
EARLIEST                        09/28                                
LATEST                          05/19                                 
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              6.0
RESULTANT WIND SPEED/DIRECTION   4/103
HIGHEST WIND SPEED/DIRECTION    48/120    DATE  11/14
HIGHEST GUST SPEED/DIRECTION    62/110    DATE  11/14

SKY COVER
NUMBER OF DAYS FAIR           41
NUMBER OF DAYS PC             69
NUMBER OF DAYS CLOUDY        254

AVERAGE RH (PERCENT)     79

WEATHER CONDITIONS. NUMBER OF DAYS WITH 
THUNDERSTORM              0     MIXED PRECIP               8
HEAVY RAIN                5     RAIN                      74
LIGHT RAIN              191     FREEZING RAIN              0
LT FREEZING RAIN          4     HAIL                       1
HEAVY SNOW                4     SNOW                      42
LIGHT SNOW               94     SLEET                     11
FOG                     245     FOG W/VIS <= 1/4 MILE     22
HAZE                     15                                           
                                                                    
-  INDICATES NEGATIVE NUMBERS.                                      
R  INDICATES RECORD WAS SET OR TIED.                                
MM INDICATES DATA IS MISSING.                                       
T  INDICATES TRACE AMOUNT.                                          

FRITSCH