weather.gov     
National Weather Service

Climatological Report (Annual)
NWS Homepage
This page is being discontinued on March 12, 2014.
The same data is available at this site. Please update your bookmarks.
Thank you, and we apologize for the inconvenience.
Please send an email to SR-SRH.Webmaster@noaa.gov with any concerns.


Current Version
Previous Version:    01  02  03  04  05  06  07  08  09  10  11  12  13  
[Printable]
277
CXUS56 KPQR 012245 RRA
CLAPDX

ANNUAL CLIMATE REPORT
NATIONAL WEATHER SERVICE PORTLAND OR
225 PM PST WED JAN 1 2014

...PORTLAND 2013 WEATHER IN REVIEW...

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

JANUARY...PORTLAND WAS ON THE EDGE OF THE MUCH DRIER PART OF
    NORTHWEST OREGON...INCOMING FRONTS STILL MANAGED TO PUSH
    RAIN TO THE PORTLAND AREA. AS A RESULT RAINFALL WAS NOT AS
    DRASTICALLY BELOW NORMAL AS OTHER SITES IN THE WILLAMETTE
    VALLEY. OVERALL...RATHER TYPICAL JANUARY. EAST WINDS BROUGHT
    COOLER AIR TO AREA AT TIMES...WITH TEMPERATURES IN THE LOWER
    TO MIDDLE 20S AT TIMES. STRONG FRONT BROUGHT HEAVY RAIN INTO
    THE PORTLAND/VANCOUVER METRO ON 29TH AND 30TH...WITH MANY
    AREAS RECEIVING 1.00 TO 1.50 INCHES OF RAIN.

FEBRUARY...PLENTY OF CLOUDS...BUT RAINFALL WAS AGAIN BELOW
    NORMAL. BUT TEMPERATURES REMAINED NEAR NORMAL. THE CLOUDS
    KEPT TEMPERATURES COOLER THAN USUAL DURING THE DAY...BUT
    A TAD WARMER AT NIGHT. TEMPERATURES ONLY DROPPED TO/BELOW
    FREEZING ONCE...ON MORNING OF THE 8TH WITH A LOW OF 30 DEG.

MARCH...RATHER BENIGN MONTH OF WEATHER. HIGH PRESSURE OVER THE
    REGION WEAKENED FRONTS AS THEY PUSHED INTO THE REGION. AS A
    RESULT...FRONTS BROUGHT LESS RAINFALL. STRONGEST FRONT ON
    THE 20TH PRODUCED STRONG SOUTH WINDS WITH GUSTS 35 TO 50 MPH.
    ON THE 21ST...SCATTERED SHOWERS AND THUNDERSTORMS PRODUCED
    SPOTTY SMALL HAIL. ONE THUNDERSTORM PRODUCED A WEAK TORNADO
    NEAR HOCKINSON IN RURAL CLARK COUNTY.

APRIL...MILD MONTH WITH A BIT MORE IN WAY OF RAIN...BUT STILL THE
    RAINFALL WAS A BIT BELOW NORMAL. STRONG FRONT ROLLED ACROSS
    THE AREA ON THE 6TH AND 7TH...WITH WINDS GUSTING 35 TO 50 MPH
    IN METRO AREA. SEASONABLE WEATHER THROUGH THE MID MONTH...WITH
    ANOTHER STRONG FRONT ON THE 19TH. WHILE THE PORTLAND AIRPORT
    RECEIVED 0.41 INCH OF RAIN ON THE 19TH...AREAS IN THE NEARBY
    CASCADES RECEIVED 1 TO 2 INCHES OF RAIN. DRY AND SUNNY WEATHER
    CLOSED THE MONTH...WITH TEMPERATURES WELL INTO THE 70S FROM
    THE 24TH TO 27TH.

MAY...STARTED RATHER MILD...WITH HIGHS REACHING INTO THE MIDDLE
    80S BY THE 5TH. BUT IT WAS ALSO DRY...WITH NO RAIN FOR THE
    FIRST 11 DAYS OF MAY. AFTER THE 12TH...MORE SEASONABLE
    WEATHER RETURNED. A VERY MOIST FRONT PUSHED HEAVY RAIN OVER
    THE METRO AREA ON THE 22ND AND 23RD. DURING THOSE 2 DAYS...
    NEARLY 2 INCHES OF RAIN FELL AT THE PORTLAND AIRPORT...BUT
    A FEW SURROUNDING AREAS RECEIVED MORE...SUCH AS CAMAS WITH
    NEARLY 3 INCHES. RAINFALL FOR MAY 2013 WAS WELL ABOVE NORMAL.

JUNE...OVERALL...RATHER NORMAL JUNE IN TERMS OF TEMPERATURE AND
    PRECIPITATION. SHOWERS AND A FEW THUNDERSTORMS ON THE 12TH
    AND 13TH BROUGHT SOME EXCITEMENT. FUNNEL CLOUDS WERE REPORTED
    THROUGHOUT THE WILLAMETTE VALLEY ON THE 13TH...ALONG WITH A
    TORNADO IN MCMINNVILLE. ONE FUNNEL CLOUD WAS REPORTED 2 MILES
    EAST OF HILLSBORO AIRPORT. ON THE 19TH...ANOTHER FUNNEL CLOUD
    OCCURRED 2 MILES WEST TO NORTHWEST OF THE PORTLAND AIRPORT.
    23RD...YET ANOTHER BAND OF SHOWERS MOVED ACROSS THE REGION.
    THIS BAND PROODUCED A WEAK TORNADO NEAR BIRKENFELD IN RURAL
    COLUMBIA COUNTY. AFTER THE 24RD...IT WAS SUNNY AND WARM.
    TEMPERATURES CLIMBED INTO THE LOWER 90S ON THE 28TH...AND
    REACHED 97 DEG ON THE 30TH.

JULY...HIGH PRESSURE OVER THE NORTHEAST PACIFIC GREW STRONGER IN
    JULY. THIS MAINTAINED A DRY AIR MASS OVER THE REGION. WHILE A
    FEW AFTERNOON THUNDERSTORMS DID DEVELOP OVER THE CASCADES...
    NONE APPROACHED THE NORTH WILLAMETTE VALLEY. A FEW DROPS FELL
    INTO THE RAIN BUCKET...BUT NOT ENOUGH TO MEASURE. IT WAS THE
    5TH JULY SINCE 1940 TO RECORD ONLY A TRACE OF RAIN (OTHER YEARS
    WERE 2003..1984..1960..1958 AND 1952). WITH A LOT MORE SUNNY
    DAYS...TEMPERATURES ROSE INTO THE UPPER 70S TO MIDDLE 80S
    NEARLY EVERY DAY.

AUGUST...AUGUST CONTINUED WHERE JULY ENDED...DRIER THAN NORMAL.
    UPPER LOW PRESSURE OFF THE SOUTH OREGON COAST BECAME THE
    DOMINANT WEATHER PATTERN. THIS PATTERN MAINTAINED A WARM
    AND HUMID SOUTHERLY FLOW OVER WESTERN OREGON THROUGH MUCH OF
    THE MONTH. AFTERNOON/EVENING THUNDERSTORMS OVER THE CASCADES
    TEASED PORTLAND WITH A FEW SPRINKLES FROM TIME TO TIME. ON THE
    9TH AND 10TH...STRONG THUNDERSTORMS PRODUCED LARGE HAIL AND
    STRONG WINDS IN THE CASCADES. SCATTERED THUNDERSTORMS DID
    WORK INTO THE METRO AREA ON THE 29TH AND 30TH.

    WARM HUMID SOUTHERLY FLOW ALOFT BROUGHT UNUSUALLY HIGH
    DEWPOINT TEMPERATURES TO THE REGION. PORTLAND AUGUST LOWS
    ARE NORMALLY 55 TO 60 DEG...BUT WITH THE HUMID AIR IN PLACE...
    TEMPERATURES HAD A DIFFICULT TIME DROPPING OUT OF THE 60S.
    THIS MADE FOR MANY UNCOMFORTABLE NIGHTS AND WITH WARM MUGGY
    DAYS. AUGUST 2013 SET A NEW RECORD FOR THE MOST NIGHTS WITH
    LOW TEMPERATURES AT OR ABOVE 60 DEG...WITH 22 SUCH NIGHTS.
    PREVIOUS RECORD WAS 21 SET IN 2004.

SEPTEMBER...STARTED DRY AND WARM...WITH HIGHS WELL INTO THE 80S.
    THUNDERSTORMS OVER THE CASCADES AGAIN MOVED ACROSS THE REGION
    ON THE 2ND THROUGH THE 4TH. ONE LIGHTNING BOLT STARTED AN
    ATTIC FIRE AT A HOUSE IN THE WEST HILLS. HEAVY RAIN FELL ON
    6TH...WITH MANY AREAS SEEING 1 TO 2 INCHES OF RAIN. AFTER
    THE 7TH...DRY MILD WEATHER RESUMED. BUT THE CLASSIC SWITCH TO
    FALL STARTED AFTER THE 20TH. A SERIES OF STRONG FRONTS
    BROUGHT ROUNDS OF GUSTY SOUTH WINDS AND HEAVY RAIN...WITH
    THE HEAVIEST OCCURRING ON THE 28TH THROUGH THE 30TH. DURING
    THAT TIME...2 TO 5 INCHES OF RAIN FELL IN/AROUND PORTLAND.
    WINDS GUSTED 40 TO 50 MPH AT TIMES. WIND DAMAGE TO TREES
    THAT WERE STILL HEAVY WITH LEAVE CREATED SOME POWER OUTAGES.
    LEAF-CLOGGED DRAINS LED TO POOR DRAINAGE AND LOCAL STREET
    FLOODING. SEPTEMBER 2013 WAS THE WETTEST SEPTEMBER ON RECORD
    WITH 5.62 INCHES. THE OLD RECORD FOR SEPTEMBER WAS 4.30 INCHES
    SET BACK IN 1986. DOWNTOWN PORTLAND ALSO SET A NEW RECORD
    WITH 6.85 INCHES (OLD RECORD 5.52 INCHES SET IN 1927).
    SEPTEMBER 2013 SET A NEW RECORD FOR THE MOST NIGHTS WITH
    LOW TEMPERATURES AT OR ABOVE 60 DEG...WITH 13 SUCH NIGHTS.
    PREVIOUS RECORD WAS 8 SET IN 2000.

OCTOBER...RAIN OPENED OCTOBER...THEN SOME SHOWERS. ON THE 8TH
    A FUNNEL CLOUD WAS REPORTED IN CLACKAMAS NEAR I205 AND THE
    GLADSTONE EXIT. AFTERWARDS...HIGH PRESSURE OVER THE REGION
    RESUMED THE DRY AND MILD WEATHER. NO RAIN OCCURRED FROM THE
    13TH TO 26TH. WITH THE MOIST GROUND...THE LIGHT WINDS AND
    CLEAR SKIES BROUGHT BY THE HIGH PRESSURE RESULTED IN
    FREQUENT FOG AND LOW CLOUDS BETWEEN LATE NIGHT AND MORNING
    HOURS. THE TREND OF BELOW NORMAL RAINFALL RESUMED IN OCTOBER.

NOVEMBER...RATHER BENIGN MONTH...AS TEMPERATURES AVERAGE NEAR
    NORMAL. A STRONG COLD FRONT ROLLED ACROSS THE REGION ON THE
    MORNING OF THE 7TH AND PRODUCED WINDS GUSTS OF 30 TO 45 MPH.
    AFTERWARDS...WEATHER WAS MUCH MORE BENIGN. RAINFALL WAS WELL
    BELOW NORMAL AS THE MAIN STORM TRACK WAS SHUNTED FAR NORTH
    ...IN PART DUE TO PERSISTENT HIGH PRESSURE OVER THE WESTERN
    UNITED STATES. AFTER THE 20TH PATCHY FOG AND EVEN FREEZING
    FOG CREATED LOCALIZED ICY/FROSTY ROADWAYS AT NIGHT INTO THE
    EARLY MORNING. BUT FOG CLEARED ON MOST MORNINGS...LEAVING
    THE REGION UNDER MILD CONDITIONS.

DECEMBER...STARTED MILD AT FIRST...BUT VERY COLD ARCTIC AIR
    PUSHED INTO THE PACIFIC NORTHWEST ON THE 3RD AND 4TH...
    BRINGING THE COLDEST AIR SINCE 1972. A FEW SNOW FLURRIES
    ACROSS THE AREA...WITH OCCASIONAL DUSTINGS. PORTLAND WAS
    USUALLY TOO FAR NORTH OR TOO FAR SOUTH OF ANY SIGNIFICANT
    SNOWBANDS. WITH NO SNOW ON THE GROUND...AND CONTINUED EAST
    WINDS...TEMPERATURES WERE NOT AS COLD AS OTHER AREAS. STILL
    PORTLAND AIRPORT DROPPED INTO THE LOWER TEENS...BUT AREA
    FURTHER REMOVED FROM THE EAST WINDS...SUCH AS FOREST GROVE
    AND HILLSBORO...DROPPED IN THE SINGLE DIGITS.

    WARMER WEATHER RETURNED BY THE 11TH WITH SEASONABLE WEATHER.
    BUT IT REMAINED ON THE DRY SIDE AS PERSISTENT HIGH PRESSURE
    REMAINED OVER THE WESTERN UNITED STATES. THIS HIGH PRESSURE
    BROUGHT LIGHT WINDS AND SET UP STRONG INVERSIONS...WHICH
    PREVENTED GOOD MIXING OF THE AIR IN THE VALLEY. THIS LED TO
    PERSISTENT FOG AND LOW CLOUDS AND AREAS OF STAGNANT AIR.

=================================================================
NEW RECORDS SET IN 2013 (PREVIOUS RECORD IN PARENTHESES)
    PERIOD OF RECORD FOR PORTLAND AIRPORT: 1940-2013
    (* INDICATES MOST RECENT OF MULTIPLE OCCURRENCES)

JAN...
         NO NEW RECORDS IN FEBUARY.
FEB...
         NO NEW RECORDS IN FEBUARY.
MAR...
     1ST    NEW DAILY WARM LOW    51 DEG    (48/1968)
    22ND    TIED DAILY COOL HIGH  46 DEG    (46/1975)
    30TH    NEW DAILY HIGH        77 DEG    (74/1942)
    31ST    NEW DAILY HIGH        77 DEG    (71/1987)
APR...
     4TH    NEW DAILY WARM LOW    52 DEG    (51/1991)
     5TH    NEW DAILY WARM LOW    51 DEG    (50/1989)
MAY...
    12TH    NEW DAILY WARM LOW    59 DEG    (55/1997)
    MONTH   3RD WETTEST MAY     4.75 INCHES
JUN...
    30TH    TIED DAILY WARM LOW   64 DEG    (62/2012)
JUL...
     1ST    NEW DAILY WARM LOW    66 DEG    (64/1942)
     2ND    NEW DAILY WARM LOW    63 DEG    (62/1942)
AUG...
    29TH    NEW DAILY WARM LOW    65 DEG    (63/2009)
    30TH    NEW DAILY WARM LOW    65 DEG    (63/2007)
    MONTH   RECORD AUGUST WITH MOST LOW TEMPERATURE
            OF 60 DEG OR WARMER   22 DAYS   (21/2004)
SEP...
     1ST    TIED DAILY WARM LOW   63 DEG    (63/1998)
     2ND    NEW DAILY WARM LOW    64 DEG    (63/1978)
     9TH    NEW DAILY WARM LOW    62 DEG    (61/2011)
    11TH    NEW DAILY WARM LOW    63 DEG    (61/1997)
    11TH    NEW DAILY HIGH        95 DEG    (94/2009)
    12TH    NEW DAILY WARM LOW    61 DEG    (60/2001)
    16TH    TIED DAILY WARM LOW   61 DEG    (61/2010)
    28TH    NEW DAILY RAINFALL  1.25 IN.    (1.08/2007)
    29TH    NEW DAILY RAINFALL  1.44 IN.    (0.59/1951)
    MONTH   WETTTEST SEPTEMBER  5.62 IN.    (4.30/1986)
    MONTH   RECORD SEPTEMBER WITH MOST LOW TEMPERATURES
            OF 60 DEG OR WARMER    13 DAYS   ( 8/2000)
OCT...
     2ND    TIED DAILY COOL HIGH  54 DEG    (54/1950)
     3RD    TIED DAILY COOL HIGH  56 DEG    (56/1950)
NOV...
     NO NEW RECORDS IN NOVEMBER.
DEC...
     3RD    NEW DAILY LOW         27 DEG    (28/1988)
     4TH    NEW DAILY LOW         22 DEG    (23/1972)
     5TH    NEW DAILY LOW         19 DEG    (20/1972)

YEAR    2013 WAS 5TH DRIEST YEAR ON RECORD WITH 23.59 INCHES.

YEAR    2013 SET NEW RECORD FOR MOST NIGHTS WHEN LOW TEMPERATURE
        WAS 60 DEG OR WARMER.

============================================================
2013 PORTLAND AIRPORT TEMPERATURE DATA

      |--- AVERAGES ----| MEAN T DEPART| EXTREME TEMPS/DATE  |
MONTH |HIGHS LOWS   MEAN|  FROM NORMAL | HIGHEST      LOWEST |
=============================================================
JAN     42.7  33.0   37.8   -3.6 DEG     55/ 8TH      23/21ST
FEB     50.7  38.1   44.4   +0.6 DEG     61/15TH      30/ 8TH
MAR     57.4  39.9   48.7   +0.5 DEG     77/31ST*     29/ 4TH
APR     61.3  43.4   52.4   +0.1 DEG     78/26TH      36/17TH
MAY     69.5  49.9   59.7   +1.4 DEG     85/11TH      40/ 1ST
JUN     75.4  55.3   65.4   +1.8 DEG     97/30TH      49/10TH
JUL     82.4  57.6   70.0   +0.8 DEG     92/16TH      53/28TH
AUG     81.5  60.9   71.2   +1.7 DEG     91/ 6TH      57/20TH
SEP     72.8  56.7   64.7   +0.2 DEG     95/11TH      47/25TH
OCT     63.4  43.6   53.5   -1.4 DEG     74/ 6TH      32/29TH
NOV     52.5  38.8   45.7   -0.9 DEG     60/11TH      24/22ND
DEC     41.6  31.1   36.4   -4.0 DEG     57/ 1ST      12/ 8TH

2013    62.7  45.7   54.2   +0.3 DEG     97/JUN 30    12/DEC 8
NORMAL  63.2  45.7   54.5                 *LAST OF MULTIPLE

DAYS WITH TEMPERATURES IN 2013 WHERE...
       |------ MAXIMUM TEMP --------||------ MINIMUM TEMP ---|
       <=32  60+  70+  80+  90+ 100+  <=20  <=32   60+   70+
==============================================================
JAN      0    0    0    0    0    0      0    14    0     0
FEB      0    1    0    0    0    0      0     1    0     0
MAR      0   11    2    0    0    0      0     3    0     0
APR      0   13    4    0    0    0      0     0    0     0
MAY      0   25   14    5    0    0      0     0    0     0
JUN      0   30   22    9    2    0      0     0    5     0
JUL      0   31   31   21    4    0      0     0    5     0
AUG      0   31   30   21    2    0      0     0   22     0
SEP      0   28   17   11    2    0      0     0   13     0
OCT      0   21    6    0    0    0      0     1    0     0
NOV      0    1    0    0    0    0      0     9    0     0
DEC      5    0    0    0    0    0      4    14    0     0

2013     5  192  126   67   10    0      4    42   45     0
NORMAL   2  197  120   54   12    1      2    30   21     0

FIRST/LAST OCCURRENCES OF...        IN 2013    NORMAL
  LAST 32 DEG OR COLDER IN SPRING    MAR  9     MAR 19
  FIRST 70+ DEG OF THE YEAR          MAR 30     MAR 30
  FIRST 80+ DEG OF THE YEAR          MAY  4     MAY 10
  FIRST 90+ DEG OF THE YEAR          JUN 28     JUN 16

  LAST 90+ DEG OF THE YEAR           SEP 11     SEP  8
  LAST 80+ DEG OF THE YEAR           SEP 19     SEP 29
  LAST 70+ DEG OF THE YEAR           OCT 23     OCT 18
  FIRST 32 DEG OR COLDER IN FALL     OCT 29     NOV 15
==============================================================

2013 PORTLAND AIRPORT RAINFALL DATA...
DAYS WITH TEMPERATURES WHERE ...
       TOTAL  DEPARTURE  DAYS WITH AT LEAST...  GREATEST IN
MONTH   RAIN  FM NORMAL   0.01 0.10 0.50 1.00   24HRS & DATE
===============================================================
JAN     3.49    -1.39      17   11    1    1    1.19 JAN 28-29
FEB     1.29    -2.40      15    5    0    0    0.39 FEB 22
MAR     1.46    -2.22       7    4    1    0    0.89 MAR 19-20
APR     2.19    -0.54      17    6    1    0    0.61 APR 6
MAY     4.75    +2.28      14   10    3    1    1.39 MAY 22-23
JUN     1.35    -0.35       8    6    0    0    0.48 JUN 12-13
JUL     TRACE   -0.65       0    0    0    0    NO RAIN IN JULY
AUG     0.78    +0.11       6    2    0    0    0.39 AUG 28-29
SEP     5.62    +4.15      14   11    4    2    1.98 SEP 28-29
OCT     1.15    -1.85       9    4    0    0    0.33 OCT 1
NOV     3.05    -2.58      16   12    0    0    0.64 NOV 1-2
DEC     1.62    -3.87      13    3    1    0    0.91 NO30-DEC 1

  2013  26.72   -9.31     136   74   11    4    1.98 SEP 28-29
NORMAL  36.03             155   91   19    4

PORTLAND WATER YEAR 2012-13 (1 OCT 2012 THROUGH 30 SEP 2013)
      42.83 INCHES      6.80 INCHES ABOVE NORMAL

============================================================

2013 PORTLAND AIRPORT WIND AND PRESSURE DATA...
      AVERAGE SPEED (MPH)    STRONGEST WIND GUST (MPH)
MONTH   2013  NORMAL    DIRECTION   SPEED   DATE
============================================================
JAN      6.0    9.3 EAST        36 MPH  JAN  2
FEB      5.6    8.7 SOUTH       35 MPH  FEB 22
MAR      5.2    7.7 SOUTHWEST   39 MPH  MAR 20
APR      6.1    7.1 SOUTH       41 MPH  APR  7
MAY      6.2    6.7SOUTHWEST   36 MPH  MAY 13
JUN      5.5    7.0 SOUTHWEST   24 MPH  JUN 24
JUL      6.6    7.2 NORTHWEST   28 MPH  JUL 26
AUG      5.0    6.8 SOUTH       28 MPH  AUG 29
SEP      6.1    6.2 SOUTHWEST   43 MPH  SEP 28
OCT      3.7    6.3 WEST        28 MPH  OCT  1
NOV      5.9    8.0 SOUTHWEST   39 MPH  NOV  7
DEC      5.0    9.3 EAST        41 MPH  DEC  6

2013     5.8    7.5 SOUTH       43 MPH  SEP 28

HIGHEST PRESSURE IN 2013...30.68 INCHES    JAN 16
LOWEST PRESSURE IN 2013...29.37 INCHES    SEP 29

============================================================
PORTLAND AIRPORT CLIMATE PERIOD OF RECORDS...   1940 TO 2013
PORTLAND AIRPORT CLIMATE NORMALS BASED ON...    1981 TO 2010
============================================================

DATA COMPILED BY ROCKEY
NATIONAL WEATHER SERVICE PORTLAND OREGON

ONLINE AT:     WEATHER.GOV/PORTLAND


$$




U.S. Dept. of Commerce
NOAA National Weather Service
1325 East West Highway
Silver Spring, MD 20910
E-mail: w-nws.webmaster@noaa.gov
Page last modified: May 16, 2007
NATIONAL WEATHER SERVICE: for Safety, for Work, for Fun - FOR LIFE