Climatological Report (Annual)
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000
CXAK57 PAJK 051143 CCA
CLAAJK

CLIMATE REPORT
NATIONAL WEATHER SERVICE JUNEAU, AK
235 AM AKST SAT JAN 5 2019

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

...THE JUNEAU CLIMATE SUMMARY FOR THE YEAR OF 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1936 TO 2019

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   06/20        80       5       81  08/05
LOWEST              4   02/10        -1       5        1  12/31
                        02/09
AVG. MAXIMUM     49.7              48.1     1.6
AVG. MINIMUM     35.9              36.2    -0.3
MEAN             42.8              42.1     0.7     41.3
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32     40              37.4     2.6       59
DAYS MIN <= 32    140             119.3    20.7      139
DAYS MIN <= 0       0               1.9    -1.9        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        85.15   1991
 MINIMUM        28.32   2001
TOTALS          55.72             62.27   -6.55    69.57
DAILY AVG.       0.15              0.17   -0.02
DAYS >= .01       205             229.8   -24.8      210
DAYS >= .10       126             146.4   -20.4      145
DAYS >= .50        35              38.4    -3.4       49
DAYS >= 1.00       11               8.9     2.1       17
GREATEST
 24 HR. TOTAL    1.75   10/14 TO 10/14

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           65.6              86.7   -21.1     66.7
 LIQUID EQUIV    6.56              8.00   -1.44
SINCE 7/1        15.1              29.5   -14.4     26.8
 LIQUID 7/1      1.51              2.80   -1.29
SNOWDEPTH AVG.      1                 2      -1
DAYS >= TRACE      73              43.1    29.9       71
DAYS >= 1.0        20              22.8    -2.8       20
GREATEST
 SNOW DEPTH        13   03/08
 24 HR TOTAL      6.7   03/07 TO 03/07

DEGREE_DAYS
HEATING TOTAL    7967              8351    -384     8513
 SINCE 7/1       3146              3721    -575
COOLING TOTAL      16                 3      13        1
 SINCE 1/1         16                 2      14

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

WIND (MPH)
AVERAGE WIND SPEED              6.9
HIGHEST WIND SPEED/DIRECTION    46/120    DATE  12/10
HIGHEST GUST SPEED/DIRECTION    56/110    DATE  12/10


WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                7     RAIN                      70
LIGHT RAIN              217     FREEZING RAIN              0
LT FREEZING RAIN          7     HAIL                       0
HEAVY SNOW                1     SNOW                      36
LIGHT SNOW               66     SLEET                      3
FOG                     205     FOG W/VIS <= 1/4 MILE     34
HAZE                      2

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

$$

...WARMER THAN NORMAL ACROSS SOUTHEAST ALASKA AND SEVERE DROUGHT
CONDITIONS FOR THE SOUTHERN PANHANDLE IN 2018...

WHILE WARMER THAN NORMAL OVERALL, 2018 WAS PUNCTUATED BY SOME COOLER
(OR COLDER) THAN NORMAL TEMPERATURES WITH THE MONTH OF FEBRUARY
BEING THE MOST NOTABLE. IN ALL FOUR CLIMATE SITES, THIS WAS MUCH
MORE THE RESULT OF COLD OVERNIGHT LOWS THAN BELOW NORMAL DAYTIME
HIGHS. THE CAUSUAL FACTORS WERE STABLE AND LONG LASTING OUTFLOW
CONDITIONS WITH HIGH PRESSURE ANCHORED OVER WESTERN CANADA FOR MUCH
OF THE MONTH. ANOTHER PERIOD OF REGULAR AND CONSISTENT LOWER THAN
NORMAL OVER NIGHT LOWS OCCURRED IN SEPTEMBER. IN THIS CASE, HOWEVER,
DAILY AVERAGE TEMPERATURES REMAINED AT OR ABOVE NORMAL OWING TO
ABOVE NORMAL DAYTIME HIGHS DURING AN EXTENDED PERIOD OF SUMMER-LIKE
WEATHER WITH CLEAR SKIES AND DRY WEATHER. OF NOTE, THE KETCHIKAN
TIDE GAUGE RECORDED A DAYTIME HIGH OF 67 DEGREES ON JANUARY 14TH.
THIS WAS THE ALL-TIME WARMEST TEMPERATURE EVER RECORDED ANYWHERE IN
ALASKA FOR THAT DATE. THE SUMMER OF 2018 WAS NOTED FOR BEING ONE OF
THE BEST IN SEVERAL YEARS AND RIVALING THE EXCEPTIONAL SUMMER OF
2004. JUNE FEATURED MANY SUNNY AND WARM DAYS, PARTICULARLY DURING
THE SECOND HALF OF THE MONTH. THE WARM, SUNNY, AND DRY WEATHER
CONTINUED IN JULY WITH A BRIEF PERIOD OF RAIN DURING THE SECOND WEEK
OF THE MONTH. JUNEAU RECORDED ITS WARMEST JULY ON RECORD WITH A
MONTHLY AVERAGE TEMPERATURE OF 61.2 DEGREES. A DRY AND SUNNY SECOND
HALF OF JULY WAS PARTICULARLY NOTABLE SINCE THIS NORMALLY MARKS THE
RETURN OF THE WET SEASON IN SOUTHEAST ALASKA. MORE ON THAT IN A BIT.
AUGUST CONTINUED THE TREND OF WARMER THAN NORMAL CONDITIONS, A TREND
THAT INCREASED FOR THE REMAINDER OF THE YEAR. EVEN THOUGH AUTUMN
TEMPERATURES DID ARRIVE, ALBEIT SLIGHTLY LATER THAN USUAL,
TEMPERATURE DEPARTURES ABOVE NORMAL INCREASED THROUGH NOVEMBER AND
REMAINED WELL ABOVE NORMAL FOR ALL BUT THE FIRST FEW DAYS OF
DECEMBER.

PERHAPS THE BIGGEST STORY IN SOUTHEAST ALASKA WAS A DRIER THAN
NORMAL CALENDAR YEAR. WHILE NONE OF THE 4 CLIMATE SITES SAW A RECORD
DRY YEAR, ALL 4 WERE SIGNIFICANTLY BELOW NORMAL IN ACCUMULATED
PRECIPITATION. ONLY MAY RECORDED SOLIDLY ABOVE NORMAL PRECIPITATION
TOTALS AT ALL 4 SITES. WHILE AUGUST SAW ABOVE NORMAL PRECIPITATION
AT YAKUTAT, SITKA AND JUNEAU, KETCHIKAN RECORDED SIGNIFICANTLY BELOW
NORMAL RAINFALL. FEBRUARY, MARCH AND DECEMBER WERE UNIFORMLY BELOW
NORMAL WITH ALL REMAINING MONTHS EXCEPT SEPTEMBER BEING A MIXED BAG.
SEPTEMBER WAS EXRAORDINARILY DRY ACROSS ALL OF SOUTHEAST ALASKA. IN
WHAT IS SUPPOSED TO BE ONE OF THE WETTER MONTHS OF THE YEAR, THE
PRECIPITATION DEFICIT RANGED FROM 8 TO 18 INCHES BELOW NORMAL. THAT
EQUATES TO A RANGE OF FROM 64% (KETCHIKAN) TO 85% (YAKUTAT) BELOW
NORMAL RAINFALL. NUMEROUS SITES ACROSS SOUTHEAST ALASKA RECORDED
THEIR DRIEST JULY ON RECORD, TO INCLUDE HAINES, JUNEAU, AND KLAWOCK.
PETERSBURG, SITKA, AND YAKUTAT ALL RECORDED THEIR 2ND DRIEST JULY ON
RECORD. THROUGHOUT THE YEAR, THE SOUTHERN PANHANDLE WAS HARDEST HIT
BY THE LACK OF RAIN AND SNOW. ONLY APRIL AND MAY SAW MEANINGFUL
ABOVE NORMAL PRECIPITATION TOTALS. THE REMAINDER OF THE YEAR
FEATURED NEAR NORMAL, OR FOR MOST MONTHS, WELL BELOW NORMAL TOTALS.
ALL OF SOUTHEAST ALASKA WAS CLASSIFIED AS BEING ABNORMALLY DRY BY
THE END OF MARCH AND REMAINED SO FOR THE DURATION OF THE YEAR. THE
SOUTHERN PANHANDLE, HOWEVER WAS CLASSIFIED AS BEING IN A MODERATE
DROUGHT BY MARCH AND LATER CLASSIFIED AS BEING IN A SEVERE DROUGHT
BY SEPTEMBER, WHERE IT REMAINED THROUGH THE END OF THE YEAR. THE
MOST IMMEDIATE IMPACT TO THE SOUTHERN PANHANDLE HAS BEEN A LACK OF
WATER TO SUPPORT THE HYDRO-ELECTRIC INFRASTRUCTURE THAT MOST
PANHANDLE COMMUNITIES RELY UPON. NUMEROUS COMMUNITIES RESORTED TO
DIESEL POWER GENERATION AT TIMES DURING THE YEAR, ADDING TO THE
FINANCIAL BURDEN OF RESIDENTS. WHAT IS STILL UNKNOWN IS HOW THE
ONGOING WATER SHORTAGE WILL IMPACT OTHER ASPECTS OF THE TONGASS
ECOSYSTEM OR SOUTHEAST ALASKA FISHERIES.

$$



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