Climatological Report (Monthly)
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CXAK57 PAJK 021359
CLMAJK
CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
458 AM AKST TUE JAN 2 2018

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

...THE JUNEAU CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1936 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              54   12/08/2017
                        12/23/1999
                        12/12/1944
 LOW              -21   12/31/1949
HIGHEST            54R  12/08        44      10
LOWEST              1   12/31         5      -4
AVG. MAXIMUM     36.0              34.1     1.9
AVG. MINIMUM     26.5              25.6     0.9
MEAN             31.3              29.9     1.4
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32     12              10.3     1.7
DAYS MIN <= 32     17              20.6    -3.6
DAYS MIN <= 0       0               0.3    -0.3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        13.61   1997
 MINIMUM         0.49   1983
TOTALS           8.07              5.84    2.23
DAILY AVG.       0.26              0.19    0.07
DAYS >= .01        16              20.6    -4.6
DAYS >= .10        12              13.1    -1.1
DAYS >= .50         6               3.7     2.3
DAYS >= 1.00        3               0.9     2.1
GREATEST
 24 HR. TOTAL    1.69   12/11 TO 12/11

SNOWFALL (INCHES)
RECORDS
 TOTAL           54.7   1964
 24 HR TOTAL     19.9   12/07/1962 TO 12/08/1962
 SNOW DEPTH        36   12/09/1962
TOTALS            1.3              15.6   -14.3
SINCE 7/1        26.8              29.5    -2.7
SNOWDEPTH AVG.      0                 4      -4
DAYS >= TRACE       9              10.0    -1.0
DAYS >= 1.0         1               4.6    -3.6        6
GREATEST
 SNOW DEPTH         1   12/03
                        12/02
                        12/01
 24 HR TOTAL      1.0   12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL    1038              1090     -52
 SINCE 7/1       3822              3721     101
COOLING TOTAL       0                 0       0
 SINCE 1/1          1                 2      -1

FREEZE DATES
EARLIEST                        10/02
LATEST                          05/06
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              8.7
HIGHEST WIND SPEED/DIRECTION    36/110    DATE  12/08
HIGHEST GUST SPEED/DIRECTION    47/110    DATE  12/08


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       9
LIGHT RAIN               16     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       4
LIGHT SNOW                6     SLEET                      4
FOG                      16     FOG W/VIS <= 1/4 MILE      3
HAZE                      0

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

$$
...December 2017 was warm and wet, and then cold and dry...

The cold and snowy Winter weather of late November did not last long
into December this year. By the third of the month, daytime highs
and overnight lows were already above normal and getting warmer.
Daily high temperature records were set on most days in many places
through the 14th of the month. During this time, Southeast Alaska
received nearly of its monthly precipitation as well and virtually
all of it as rain rather than snow except for the highways. The
seond half of the month was cold and dry as a result of another
strong and stationary high pressure system that set up over western
Canada. Strong outflow winds dominated the weather, particularly
across the far norhtern inner channels. By the 18th of the month,
daily highs and lows were below normal and falling...and
falling...and falling. Temperature continued to trend downward until
the last day of the month. No low temperature records were set at
the 4 primary climate sites, but several locations reported record
low temperatures on the 28th, the 29th, and the 30th of the month.
On New Year`s Eve, a strong weather front and a significantly warmer
low level air mass pushed in from the west. Snow began falling early
in the evening along the outer coast and had pushed across the
panhandle early in the night. But the new snow was too little too
late to make any significant difference to the monthly snow totals
across the panhandle. This was especially so in the Capital City,
which recorded its second lowest December snow total on record.

$$
CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
458 AM AKST TUE JAN 2 2018

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

...THE KETCHIKAN      ASOS CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2017...

CLIMATE NORMAL PERIOD 9999 TO 9999
CLIMATE RECORD PERIOD 9999 TO 9999

WEATHER         OBSERVED          NORMAL  DEPART
                 VALUE   DATE(S)  VALUE   FROM
                                          NORMAL
................................................
TEMPERATURE (F)
RECORD
 HIGH              MM   MM
 LOW               MM   MM
HIGHEST            58   12/11        MM      MM
LOWEST              7   12/30        MM      MM
AVG. MAXIMUM     40.4                MM      MM
AVG. MINIMUM     31.7                MM      MM
MEAN             36.0                MM      MM
DAYS MAX >= 90      0                MM      MM
DAYS MAX <= 32      4                MM      MM
DAYS MIN <= 32     15                MM      MM
DAYS MIN <= 0       0                MM      MM

PRECIPITATION (INCHES)
RECORD
 MAXIMUM           MM   MM
 MINIMUM           MM   MM
TOTALS          13.51                MM      MM
DAILY AVG.       0.44                MM      MM
DAYS >= .01        20                MM      MM
DAYS >= .10        16                MM      MM
DAYS >= .50         8                MM      MM
DAYS >= 1.00        5                MM      MM
GREATEST
 24 HR. TOTAL    4.15   12/09 TO 12/09

DEGREE_DAYS
HEATING TOTAL     891                MM      MM
 SINCE 7/1       2614                MM      MM
COOLING TOTAL       0                MM      MM
 SINCE 1/1         26                MM      MM

FREEZE DATES
EARLIEST                        MM
LATEST                          MM
.................................................

WIND (MPH)
AVERAGE WIND SPEED              7.1
HIGHEST WIND SPEED/DIRECTION    32/120    DATE  12/09
HIGHEST GUST SPEED/DIRECTION    42/130    DATE  12/14


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                2     RAIN                       9
LIGHT RAIN               19     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                7     SLEET                      0
FOG                      22     FOG W/VIS <= 1/4 MILE      0
HAZE                      0

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

$$
...December 2017 was warm and wet, and then cold and dry...

The cold and snowy Winter weather of late November did not last long
into December this year. By the third of the month, daytime highs
and overnight lows were already above normal and getting warmer.
Daily high temperature records were set on most days in many places
through the 14th of the month. During this time, Southeast Alaska
received nearly of its monthly precipitation as well and virtually
all of it as rain rather than snow except for the highways. The
seond half of the month was cold and dry as a result of another
strong and stationary high pressure system that set up over western
Canada. Strong outflow winds dominated the weather, particularly
across the far norhtern inner channels. By the 18th of the month,
daily highs and lows were below normal and falling...and
falling...and falling. Temperature continued to trend downward until
the last day of the month. No low temperature records were set at
the 4 primary climate sites, but several locations reported record
low temperatures on the 28th, the 29th, and the 30th of the month.
On New Year`s Eve, a strong weather front and a significantly warmer
low level air mass pushed in from the west. Snow began falling early
in the evening along the outer coast and had pushed across the
panhandle early in the night. But the new snow was too little too
late to make any significant difference to the monthly snow totals
across the panhandle. This was especially so in the Capital City,
which recorded its second lowest December snow total on record.

$$


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