Climatological Report (Monthly)
Issued by NWS

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000
CXAK57 PAJK 021359
CLMYAK
CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
458 AM AKST TUE JAN 2 2018

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

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

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1917 TO 2018

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE
                                          NORMAL
.............................................................
TEMPERATURE (F)
RECORD
 HIGH              52   MM
 LOW                3   12/15/2016
HIGHEST            51   12/10        MM      MM
                        12/09
                        12/08
LOWEST              5   12/28        MM      MM
AVG. MAXIMUM     36.5              35.0     1.5
AVG. MINIMUM     26.5              24.3     2.2
MEAN             31.5              29.6     1.9
DAYS MAX >= 90      0               0.0     0.0
DAYS MAX <= 32     11               9.2     1.8
DAYS MIN <= 32     17              22.9    -5.9
DAYS MIN <= 0       0               0.5    -0.5

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        35.21   1989
 MINIMUM         3.51   1922
TOTALS          16.49             16.28    0.21
DAILY AVG.       0.53              0.53    0.00
DAYS >= .01        22              22.5    -0.5
DAYS >= .10        17              18.3    -1.3
DAYS >= .50         9               9.6    -0.6
DAYS >= 1.00        7               5.6     1.4
GREATEST
 24 HR. TOTAL    3.09   12/07 TO 12/07

SNOWFALL (INCHES)
RECORDS
 TOTAL           91.6   1957
 24 HR TOTAL       MM
 SNOW DEPTH        70   12/30/1957
TOTALS           11.3              23.2   -11.9
SINCE 7/1        38.1              43.9    -5.8
SNOWDEPTH AVG.      2                 7      -5
DAYS >= TRACE       9              12.8    -3.8
DAYS >= 1.0         6               7.7    -1.7        5
GREATEST
 SNOW DEPTH         7   12/31
 24 HR TOTAL      3.1   12/31 TO 12/31

DEGREE_DAYS
HEATING TOTAL    1029              1096     -67
 SINCE 7/1       3703              3982    -279
COOLING TOTAL       0                 0       0
 SINCE 1/1          0                 0       0

FREEZE DATES
EARLIEST      12/01             09/16
LATEST                          05/25
..............................................................

WIND (MPH)
AVERAGE WIND SPEED              6.3
HIGHEST WIND SPEED/DIRECTION    31/140    DATE  12/11
HIGHEST GUST SPEED/DIRECTION    49/130    DATE  12/10


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                6     RAIN                      13
LIGHT RAIN               17     FREEZING RAIN              1
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW               10     SLEET                      1
FOG                      24     FOG W/VIS <= 1/4 MILE      3
HAZE                      1

-  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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