Juneau Annual Climate Summary for 2011

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CXAK57 PAJK 160543
CLMAJK

CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
701 PM AKST SUN JAN 15 2012

...................................

...THE JUNEAU CLIMATE SUMMARY FOR THE YEAR OF 2011...

...ABOVE NORMAL PRECIPITATION AND SNOWFALL AS WELL AS A NEW CLIMATE NORMAL PERIOD 
   OF RECORD...

THE YEAR 2011 MARKED THE BEGINNING OF A NEW 30 YEAR CLIMATE NORMAL PERIOD, WITH
REFERENCES TO WHAT IS CONSIDERED TO BE NORMAL NOW COMPARED TO AVERAGES DURING THE
YEARS 1981 THROUGH 2010. THE GENERAL TREND IN JUNEAU BETWEEN THE PREVIOUS AND
CURRENT CLIMATE NORMAL VALUES IS WARMER, WETTER, AND LESS SNOWY.

IN SPITE OF THE EXPECTED TREND IN TEMPERATURES, 2011 WAS NOT ONLY COOLER THAN THE
NEW NORMAL VALUES, BUT WAS ALSO COOLER THAN 2010. MUCH OF THIS HAD TO DO WITH A
SIGNIFICANT PORTION OF THE YEAR BEING INFLUENCED BY A LA NINA THAT NEVER REALLY
DISSIPATED THIS PAST SUMMER. NOTABLE ARCTIC OUTBREAKS OCCURRED IN THE MIDDLE OF
JANUARY AND THE SECOND HALF OF FEBRUARY AS WELL AS THE THIRD WEEK OF THIS PAST
NOVEMBER. THE COLDEST NIGHT OF THE YEAR WAS DURING ONE OF THESE COLD SNAPS ON
FEBRUARY 24TH WHEN THE TEMPERATURE FELL TO 1 DEGREE ABOVE ZERO. SUMMER DID NOT 
SPORT OVERLY WARM TEMPERATURES EITHER. MAY, AUGUST, AND SEPTEMBER WERE ALL BELOW 
NORMAL WHILE JUNE AND JULY WERE ONLY A FRACTION OF A DEGREE ABOVE NORMAL. THE END 
OF MAY SAW 75 DEGREES AT THE AIRPORT AND THE HIGHEST TEMPERATURE OF THE SUMMER 
WAS 77 DEGREES ON JULY 11TH. THE LONGEST WARM STREAK WITH DAILY HIGHS OF 
70 DEGREES OR WARMER WAS ONLY 4 DAYS LONG. THIS OCCURRED TWICE, ONCE BEGINNING ON 
JULY 10TH AND THEN AGAIN ON JULY 20TH.

PRECIPITATION FOR 2011 DID, HOWEVER, CONFORM TO EXPECTED LONG TERM CLIMATE TRENDS.
THE ANNUAL TOTAL OF 66.4 INCHES EXCEEDED THE NEW CLIMATE NORMAL VALUE BY OVER 4
INCHES. SEVERAL MONTHS RECORDED BELOW NORMAL PRECIPITATION AND ACCUMULATED
PRECIPITATION TOTALS LAGGED BELOW NORMAL FROM LATE FEBRUARY THROUGH JULY. HEAVY
RAINS IN AUGUST MADE UP FOR THE EARLIER DEFICIT IN SPADES, WITH A MONTHLY TOTAL 
87 PERCENT ABOVE NORMAL. AUGUST 2011 WAS THE 4TH WETTEST AUGUST ON RECORD SINCE 
1948. ACCUMULATED PRECIPITATION FOR THE REST OF THE YEAR REMAINED AT OR ABOVE 
NORMAL.

SNOW TOTALS FOR 2011 ALSO DEPARTED FROM EXPECTED CLIMATE CHANGE TREND. THE 115.9
INCHES RECORDED LAST YEAR EXCEEDED THE NEW NORMAL VALUE OF 86.7 INCHES BY NEARLY 
34 PERCENT. THIS IS LARGELY DUE TO FEBRUARY AND NOVEMBER WHICH BOTH SAW 
SIGNIFICANTLY HIGHER THAN NORMAL SNOWFALL. THE 30.2 INCHES THAT FELL IN FEBRUARY 
WAS NEARLY 80 PERCENT MORE THAN NORMAL. THE PHENOMENAL SNOWFALL FROM THE PAST 
NOVEMBER TOTALLED 50.2 INCHES AND WAS MORE THAN 3 FEET (183 PERCENT) ABOVE NORMAL. 
OVER ONE FOOT OF SNOW FELL ON NOVEMBER 23RD AND OVER 9 INCHES FELL ON FEBRUARY 
19TH. EXCLUDING THESE TWO SINGLE SNOW EVENTS, SNOW TOTALS FOR THE YEAR ARE ONLY 
92.7 INCHES, OR SLIGHTLY LESS THAN 7 PERCENT ABOVE NORMAL. WHAT A DIFFERENCE ONE 
OR TWO GOOD SNOW STORMS CAN MAKE ON AN ANNUAL RECORD.

...................................

...THE JUNEAU CLIMATE SUMMARY FOR THE YEAR OF 2011...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1943 TO 2012

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            77   07/11        78      -1       80  08/15
                                                          05/27
LOWEST              1   02/24         2      -1        3  12/20
AVG. MAXIMUM     46.3              48.1    -1.8     48.9
AVG. MINIMUM     35.0              36.2    -1.2     36.5
MEAN             40.6              42.1    -1.5     42.7
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     44              37.4     6.6       36
DAYS MIN <= 32    141             119.3    21.7      131
DAYS MIN <= 0       0               1.9    -1.9        0

PRECIPITATION (INCHES)

RECORD
 MAXIMUM        85.15   1991
 MINIMUM        28.32   2001

TOTALS          66.40             62.27    4.13    53.88
DAILY AVG.       0.18              0.17    0.01     0.15
DAYS >= .01       238             229.8     8.2      217
DAYS >= .10       145             146.4    -1.4      125
DAYS >= .50        49              38.4    10.6       37
DAYS >= 1.00       10               8.9     1.1        4
GREATEST
24 HR. TOTAL    2.02   11/30 TO 12/01

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          115.9              86.7    29.2     62.9
 LIQUID EQUIV   11.59              8.70    2.89     6.29
SINCE 7/1        64.7              29.5    35.2     28.3
 LIQUID 7/1      6.47              3.00    3.47     2.83
DAYS >= TRACE      98              43.1    54.9       70
DAYS >= 1.0        31              22.8     8.2       17
GREATEST
 SNOW DEPTH        16   11/24                         13  01/13
 24 HR TOTAL     13.9   11/23 TO 11/23

DEGREE_DAYS
HEATING TOTAL    8793              8351     442     8049
 SINCE 7/1       2860              3721     861     3845
COOLING TOTAL       0                 2      -2        0
 SINCE 1/1          0                 2      -2        0

FREEZE DATES

RECORD
 EARLIEST     08/24/1969
 LATEST       06/13/1965

EARLIEST                        10/02
LATEST                          05/16
..................................................

WIND (MPH)
AVERAGE WIND SPEED              7.8
RESULTANT WIND SPEED/DIRECTION   5/106
HIGHEST WIND SPEED/DIRECTION    53/110    DATE  09/21
HIGHEST GUST SPEED/DIRECTION    71/130    DATE  09/21

SKY COVER
AVERAGE SKY COVER           0.80
NUMBER OF DAYS FAIR           26
NUMBER OF DAYS PC             62
NUMBER OF DAYS CLOUDY        277

AVERAGE RH (PERCENT)     81

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP              10
HEAVY RAIN               10     RAIN                      94
LIGHT RAIN              234     FREEZING RAIN              0
LT FREEZING RAIN          2     HAIL                       0
HEAVY SNOW                3     SNOW                      37
LIGHT SNOW               85     SLEET                     15
FOG                     238     FOG W/VIS <= 1/4 MILE     21
HAZE                      0

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.