Climatological Report (Annual)
Issued by NWS Portland, OR

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CLAPDX

ANNUAL CLIMATE REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
426 PM PST FRI JAN 25 2019

...PORTLAND 2018 WEATHER IN REVIEW...

================================================================
2018 MONTHLY WEATHER RECAPS...

JANUARY...AFTER A COOL START TO THE MONTH, JANUARY WAS FOR THE
     MOST PART A RATHER MILD MONTH. OUTSIDE OF THE MORNING LOW
     TEMPERATURE ON THE 1ST AND 2ND, TEMPERATURES REMAINED ABOVE
     FREEZING. AND, IT WAS WET, WITH RAIN OCCURRING ON 24 DAYS.
     IT WAS THE 2ND WARMEST JANUARY FOR PORTLAND WITH AN AVERAGE
     TEMPERATURE OF 45.6 DEG (RECORD WARMEST: 1953, WITH 47.3)

FEBRUARY...MONTH STARTED MILD, WITH WARMEST DAY BEING 60 DEG ON
     THE 4TH. BUT, AROUND MID-MONTH MUCH COLDER AIR MASS ARRIVED,
     WITH CHILLY RAINS AND SNOW OVER THE WEST HILLS AND OTHER
     HIGHER SPOTS ACROSS THE METRO AREA. A STRONG COLD FRONT
     PUSHED ACROSS REGION ON THE 17TH. COLDER AIR STAYED IN PLACE
     FOR THE 18TH THROUGH THE 23RD, WITH HIGHS ONLY IN THE 30S.
     ADD TO THAT OCCASIONAL SNOW, WITH OVER 4 INCHES ON 20TH.

MARCH...RATHER UNEVENTFUL MARCH, WITH NEAR NORMAL TEMPERATURES
     AND RAINFALL. SHOWERS AND ISOLATED THUNDERSTORMS ON 17TH
     THROUGH THE 22ND BROUGHT SPOTTY SMALL HAIL TO THE METRO.

APRIL...ACTIVE WEATHER PATTERN FOR FIRST HALF OF THE MONTH. ON
     THE 7TH, A STRONG FRONT PUSHED OVER THE REGION, BRINGING
     HEAVY RAIN AND GUSTY WINDS. WINDS GUSTED TO 40 MPH ON 7TH.
     A DOUGLAS FIR TREE SNAPPED, AND FELL ONTO A HOME IN INNER
     SOUTHEAST PORTLAND, WHILE WINDS DAMAGED TREES AND CAUSED
     DOWNED POWER LINES AROUND DELTA PARK/JANTZEN BEACH AREA.
     HIGH PRESSURE STRENGTHEN OVER THE PAC NW AFTER THE 17TH,
     BRINGING DRY AND WARMER CONDITIONS. TEMPERATURES ROSE INTO
     THE 80S FOR THE 24TH TO 26TH. HOWEVER, COOLER TEMPERATURES
     AND RAIN RETURNED TO CLOSE THE MONTH.

MAY...RATHER WARM, AND DRY MAY. IT WAS THE 2ND WARMEST MAY ON
     RECORD, WITH AVERAGE TEMP OF 63.0 DEG WHICH WAS JUST SHY
     OF THE RECORD WARMEST OF 63.1 DEG IN MAY 1992. BUT, ALSO
     WAS QUITE DRY, FINISHING AS 2ND DRIEST WITH 0.17 INCH
     (ABOUT 7% OF NORMAL). RECORD DRIEST WAS 0.10 INCH IN 1992.

JUNE...IT WAS A PLEASANT JUNE, WITH TEMPERATURES A BIT ABOVE
     NORMAL. WARMEST DAYS WERE THE 19TH AND 20TH, WITH HIGHS
     OF 91 AND 95 DEG. SHOWERS AND ISOLATED THUNDERSTORMS ON
     THE 9TH, PRODUCING GUSTY WINDS AND HAIL. ONE STORM
     UNJURED ONE PERSON AT HARMONY SPORTS COMPLEX IN CLARK
     COUNTY. ANOTHER THUNDERSTORMS PRODUCED PENNY TO QUARTER
     SIZED HAIL ACROSS EAST PORTLAND, FROM LAURELHURST TO THE
     GATEWAY AREA. THUNDERSTORMS OCCURRED AGAIN ON THE 21ST,
     WITH REPORTS OF PENNY TO NICKEL SIZED HAIL IN RURAL
     WASHINGTON COUNTY. THIS STORM ALSO CAUSED SPOTTY POWER
     OUTAGES FROM LIGHTNING IN BEAVERTON AND TIGARD AREAS.

JULY...WARM, WARM AND DRY. IT WAS THE 2ND WARMEST JULY ON FOR
     PORTLAND AIRPORT, WITH AVERAGE TEMPERATURE OF 74.0 DEG.
     RECORD WARMEST WAS IN 1985, WITH 74.1 DEG. JULY 2018 SAW
     15 DAYS WITH A TEMPERATURE OF 90 OR ABOVE, A NEW RECORD
     FOR JULY (PREVIOUS 14 IN 2009).

AUGUST...CONTINUED WAX.XRM AND DRY. WARMEST STRETCH OF WEATHER
     OCCURRED FROM THE 5TH TO 10TH, WITH DAILY HIGHS ABOVE
     90 DEG. ONLY SIGNIFCANT FRONT ARRIVED ON 25TH TO 26TH
     BUT RAINFALL WAS LESS THAN A TENTH OF AN INCH. BUT, AT
     LEAST HIGHS STAYED IN THE UPPER 60S TO LOWER 70S. SMOKE
     FROM FIRES OVER SOUTHWESTERN OREGON FILTERED ACROSS THE
     METRO SKIES FROM TIME TO TIME.

SEPTEMBER...SEPTEMBER OPENED ON THE WARM SIDE. BUT, A STRONG
     FRONT ARRIVED ON THE 10TH, COOLING THE REGION. THIS FRONT
     ALSO BROUGHT RAIN ON THE 10TH AND 11TH, FOLLOWED BY
     SHOWERS AND A FEW THUNDERSTORMS ON THE 12TH. ON THE 12TH
     A THUNDERSTORM DROPPED HEAVY RAIN ACROSS INNER EAST SIDE,
     WITH OVER AN INCH OF RAIN. STREET FLOODING WAS REPORTED
     AROUND BURNSIDE AND NE 28TH, NORTH TO HOLLYWOOD AND EAST
     THROUGH THE LAURELHURST NEIGHBORHOOD. TRIMET MAX LINES
     WERE TEMPORARIY CLOSED FROM LLOYD CENTER TO HOLLYWOOD.

     91 DEG ON SEP 5 CLOSED 2018 WITH THE 31 DAYS OF 90 DEG
     OR MORE IN A CALENDAR YEAR. PREVIOUS RECORD WAS 29
     DAYS SET IN 2015.

OCTOBER...TYPICALLY, THE BIG TRANSITION FROM THE DRY MILD
     FALL WEATHER TO THE COOL WET WEATHER OCCURS AROUND THE
     10TH. BUT THIS YEAR, IT WAS ABOUT 10 DAYS LATE, AS
     RAIN AND COOLER TEMPERATURES DOMINATED AFTER THE 20TH.
     THE STRONGEST FRONT MOVED ACROSS ON THE 27TH, WITH 1 TO
     2 INCHES OF RAIN. ON THE 28TH, COOL AIR MASS PROVIDED
     INSTABILITY FOR SHOWERS AND ISOLATED THUNDERSTORMS. ONE
     THUNDERSTORM PRODUCED A BRIEF TORNADO NEAR DELTA PARK
     WITH DAMAGE TO TRUCKS NEAR THE JUBITZ TRUCK CENTER.
     IT WAS RATED AS A F0 TORNADO BY NATL WEATHER SERVICE.
     ANOTHER F0 TORNADO OCCURRED ON 29TH, NEAR FOREST GROVE.

NOVEMBER...A MILD MONTH, WITH COOLEST TEMPERATURES ON THE
     9TH AND 19TH, WHEN MORNING LOWS ONLY DROPPED TO 32 DEG.
     RAINFALL WAS 2.86 INCHES, ABOUT HALF OF NORMAL. GUSTY
     EASTERLY WINDS ON THE 11TH TO 13TH CREATED SPOTTY
     POWER OUTAGES AND BROKEN TREE BRANCHES, MAINLY OVER THE
     EASTERN PART OF THE VANCOUVER/PORTLAND METRO WHERE THE
     EAST WINDS GUSTED 40 TO 50 MPH.

DECEMBER...RATHER ACTIVE WEATHER FOR DECEMBER. GUSTY EAST
     WINDS ON THE 4TH AND 5TH KEPT AREA DRY. OTHER THAN THAT,
     MOST OF THE MONTH WAS ON THE WETTER SIDE. STRONG FRONT
     ON 14TH BROUGHT SCATTERED POWER OUTAGES, AS SOUTH WINDS
     GUSTED 40 TO 50 MPH. ANOTHER MODERATELY STRONG FRONT
     PUSHED ACROSS THE AREA ON THE 18TH AND 19TH. HEAVY
     SHOWERS ON THE 23RD BROUGHT 0.50 TO 1.00 INCH OF RAIN IN
     A QUICK 2 HOUR BURST ACROSS MUCH OF THE METRO FROM
     DOWNTOWN PORTLAND EASTWARD TO TROUTDALE/GRESHAM.


==============================================================
NEW RECORDS SET IN 2018       (PREVIOUS RECORD IN PARENTHESES)
              + INDICATES MOST RECENT OF MULTIPLE OCCURRENCES

JANUARY...
  11TH  TIED. DAILY HIGH TEMP               58  (  58 / 2014 )
   JAN  *** 2ND WARMEST JANUARY (AVG TEMP 45.6 DEG)

FEBRUARY...
   4TH  TIED. DAILY HIGH TEMP               60  (  60  /1992+)
   5TH  TIED. DAILY HIGH TEMP               58  (  58  /2016+)
  21ST  NEW.  DAILY SNOWFALL               4.2" ( 0.4" /1957 )
  22ND  NEW.  DAILY SNOWFALL               0.5" ( 0.1" /1993 )
  23RD  NEW.  DAILY SNOWFALL               1.7" ( 1.0" /1957 )

MARCH...NO NEW RECORDS SET.

APRIL...
  24TH  NEW.  DAILY HIGH TEMP               80  (  79  /1999+)
  25TH  NEW.  DAILY HIGH TEMP               84  (  82  /2001 )
  26TH  TIED. DAILY HIGH TEMP               86  (  86  /2004+)

MAY...
   MAY  *** 2ND WARMEST MAY (AVG TEMP 63.0 DEG)
   MAY  *** 2ND DRIEST MAY (TOTAL RAINFALL OF 0.17 INCH)

JUNE... NO NEW RECORDS SET.

JULY..
   JUL  *** 2ND WARMEST JULY (AVG TEMP 74.1 DEG)
   JUL  NEW.  MOST DAYS WITH 90+ DEG        15  (  14  /2016 )

AUGUST... NO NEW RECORDS SET.

SEPTEMBER...
  12TH  NEW.  DAILY RAINFALL              0.82" ( 0.23"/1985 )

OCTOBER... NO NEW RECORDS SET.

NOVEMBER... NO NEW RECORDS SET.

DECEMBER...
  18TH  NEW.  DAILY HIGH TEMP               59  (  58  /1972 )

2018...
  NEW MOST DAYS 90 DEG OR MORE...           31  (  29  /2009 )
  2ND WARMEST YEAR (TIED WITH 2016). WARMEST ON RECORD IS 2015.

==============================================================
2018 PORTLAND MONTHLY TEMPERATURE AND PRECIPITATION RANKINGS

THIS SHOWS WHERE MONTH/YEAR RANKS IN PORTLANDS CLIMATE RECORD
(1940 TO 2018). RANKINGS ONLY APPLIES TO ALL OF THE SAME MONTH,
OR IN OTHER WORDS, WHERE JAN 2018 COMPARES TO ALL OTHER JAN.

RANKINGS ARE 1 TO 78, WHERE 1 IS WARMEST OR WETTEST ON RECORD
                        AND 78 IS DRIEST OR COLDEST ON RECORD.

        JA  FE  MA  AP  MA  JU  JL  AU  SE  OC  NO  DE   2018
AVG T    2  51  34  13   2  13   2   6  32  12  19   7      2
PRECIP  36  67  63  18  77  50  69  66  34  29  69  43     72

MAX T    3  57  34  26   2  14   1   8  33  16  16   8      3
MIN T    4  43  42   3   1   8   5   7  28  17  23   7      3

=============================================================
2018 PORTLAND AIRPORT TEMPERATURE DATA
     + BY DATE INDICATES LAST OF SEVERAL OCCURRENCES LISTED

      |--- AVERAGES ----| MEAN T DEPART| EXTREME TEMPS & DATE|
MONTH |HIGHS LOWS   MEAN|  FROM NORMAL | HIGHEST      LOWEST |
--------------------------------------------------------------
JAN     50.8  40.4   45.6   +4.2 DEG     59 /13TH    29 / 1ST
FEB     49.0  35.9   42.5   -1.3 DEG     60 / 4TH    23 /21ST
MAR     55.8  38.5   47.2   -1.0 DEG     69 /12TH    30 / 6TH
APR     62.1  46.4   53.8   +1.5 DEG     86 /26TH    34 / 3RD
MAY     73.6  52.4   63.0   +4.7 DEG     90 /13TH    43 / 2ND
JUN     76.2  55.3   65.7   +2.1 DEG     95 /20TH    47 /12TH+
JUL     87.5  60.5   74.0   +4.8 DEG    100 /15TH    51 /20TH+
AUG     84.3  60.0   72.1   +2.6 DEG     96 / 9TH    52 /25TH
SEP     75.9  52.8   64.4   -0.1 DEG     91 / 5TH    47 /24TH
OCT     66.1  47.1   56.6   +1.7 DEG     77 /16TH    40 /21ST+
NOV     54.8  41.4   48.1   +1.5 DEG     68 / 1ST    32 /19TH+
DEC     49.1  38.8   44.0   +3.6 DEG     59 /18TH    31 /31ST

 2018   65.6  47.5   56.5   +2.0 DEG   100 /JUL 15   23 /FEB 21
NORMAL  63.2  45.7   54.5


DAYS IN 2018 WITH TEMPERATURE OF...
       |------ MAXIMUM TEMP --------||------ MINIMUM TEMP ---|
       <=32  60+  70+  80+  90+ 100+  <=20  <=32   60+   70+
--------------------------------------------------------------
JAN      0    0    0    0    0    0      0     2    0     0
FEB      0    1    0    0    0    0      0     9    0     0
MAR      0    7    0    0    0    0      0     1    0     0
APR      0   17    4    3    0    0      0     0    0     0
MAY      0   30   21    8    1    0      0     0    0     0
JUN      0   29   25    8    4    0      0     0    4     0
JUL      0   31   31   24   15    1      0     0   20     0
AUG      0   31   30   20   10    0      0     0   19     0
SEP      0   30   25   10    1    0      0     0    1     0
OCT      0   25   11    0    0    0      0     0    0     0
NOV      0    5    0    0    0    0      0     2    0     0
DEC      0    0    0    0    0    0      0     4    0     0

(THROUGH 23 DEC)
  2018   0  206  147   73   31    1      0    18   44     0
NORMAL   2  197  120   54   12    1      2    30   21     0

FIRST/LAST OCCURRENCES OF...        IN 2018         NORMAL
  LAST 32 DEG OR COLDER IN SPRING    MAR  6        (MAR 19)
  FIRST 70+ DEG OF THE YEAR          APR 23        (MAR 30)
  FIRST 80+ DEG OF THE YEAR          APR 24        (MAY 10)
  FIRST 90+ DEG OF THE YEAR          MAY 13        (JUN 16)

  LAST 90+ DEG OF THE YEAR           SEP  5        (SEP  8)
  LAST 80+ DEG OF THE YEAR           SEP 28        (SEP 29)
  LAST 70+ DEG OF THE YEAR           OCT 19        (OCT 18)
  FIRST 32 DEG OR COLDER IN FALL     NOV  9        (NOV 15)

==============================================================
2018 PORTLAND AIRPORT RAINFALL DATA...

       TOTAL  DEPARTURE  DAYS WITH AT LEAST...   GREATEST IN
MONTH   RAIN  FM NORMAL  0.01 0.10 0.50 1.00    24HRS & DATE
---------------------------------------------------------------
JAN     5.36    +0.48      24   14    5    0    1.00 JAN 23-24
FEB     1.86    -1.80      14    6    0    0    0.39 FEB 28
MAR     2.50    -1.18      16    9    1    0    0.56 MAR 23
APR     3.34    +0.61      17    9    1    1    1.14 APR  7
MAY     0.17    -2.30       5    0    0    0    0.09 MAY  8-9
JUN     1.03    -0.67       7    4    0    0    0.37 JUN 17
JUL     0.02    -0.63       1    0    0    0    0.02 JUL  2
AUG     0.06    -0.61       3    0    0    0    0.04 AUG 27
SEP     1.59    +0.12       7    4    1    0    0.87 SEP 11-12
OCT     3.43    +0.43      13    8    1    1    1.53 OCT 27-28
NOV     2.86    -2.77      13    7    1    0    0.78 NOV 22-23
DEC     5.08    -0.41      17   11    3    0    0.80 DEC 18

  2018  27.30   -8.73     137   72   13    2    2.45 OCT 21-22
NORMAL  36.03             155   91   19    4

TOTAL SNOWFALL...         9.4 INCHES      (NORMAL 4.3 INCHES)

PORTLAND WATER YEAR 2016-17 (1 OCT 2016 THROUGH 30 SEP 2017)
      30.03 INCHES       6.00 INCHES BELOW NORMAL

============================================================
2018 PORTLAND AIRPORT WIND AND PRESSURE DATA...

       AVERAGE SPEED (MPH)    STRONGEST WIND GUST
    2018 (NORMAL)       DIRECTION   SPEED    DATE
-------------------------------------------------------------
JAN      9.4    9.3         EAST        41 MPH   JAN 15
FEB      6.0    8.7         SOUTHWEST   35 MPH   FEB 17
MAR      6.0    7.7         SOUTH       42 MPH   MAR  8
APR      8.1    7.1         SOUTHWEST   40 MPH   APR  7
MAY      6.0    6.7         SOUTH       30 MPH   MAY  8
JUN      6.3    7.0         EAST        35 MPH   JUN 17
JUL      6.7    7.2         EAST        32 MPH   JUL  4
AUG      5.4    6.8         EAST        28 MPH   AUG 21
SEP      5.6    6.2         NORTHWEST   25 MPH   SEP 22
OCT      4.9    6.3         WEST        26 MPH   OCT 28
NOV      7.4    8.0         EAST        35 MPH   NOV 17+
DEC      9.8    9.3 SOUTHWEST   46 MPH   DEC 14+

2018     6.8    7.5EAST         46 MPH  DEC  5
                            SOUTHWEST    46 MPH  DEC 14

HIGHEST PRESSURE IN 2018...30.55 INCHES    NOV  8
LOWEST PRESSURE IN 2018...29.41 INCHES    APR  7

===============================================================
PORTLAND AIRPORT CLIMATE PERIOD OF RECORDS... OCT 1940 TO 2018
PORTLAND AIRPORT CLIMATE NORMALS BASED ON...  1981 TO 2010
===============================================================

DATA COMPILED BY ROCKEY
NATIONAL WEATHER SERVICE PORTLAND OREGON

ONLINE AT:     WEATHER.GOV/PORTLAND


$$



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