Climatological Report (Monthly)
Issued by NWS Medford, OR

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000
CXUS56 KMFR 011148
CLMMFR

CLIMATE REPORT
NATIONAL WEATHER SERVICE MEDFORD, OR
110 AM PST SUN NOV 1 2020

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

...THE MEDFORD OR CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2020...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1911 TO 2020

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              99   10/02/1980
 LOW               18   10/29/1971
HIGHEST            94   10/01                         79  10/07
LOWEST             30   10/26                         26  10/31
                                                          10/30
                                                          10/29
AVG. MAXIMUM     77.4              69.9     7.5     66.8
AVG. MINIMUM     43.5              42.0     1.5     37.2
MEAN             60.6              56.0     4.6     52.0
DAYS MAX >= 90      2               1.1     0.9        0
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      2               1.4     0.6        6
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         9.16   1950
TOTALS           0.16              1.13   -0.97     0.65
DAILY AVG.       0.01              0.04   -0.03     0.02
DAYS >= .01         0               7.1    -7.1        6
DAYS >= .10         0               3.2    -3.2        2
DAYS >= .50         0               0.5    -0.5        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.16   10/10 TO 10/10
                        10/13 TO 10/13
                        10/24 TO 10/24

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.3   1956
TOTALS            0.0               0.0     0.0      0.0
SINCE 7/1         0.0               0.0     0.0      0.0

DEGREE_DAYS
HEATING TOTAL     157               291    -134      395
 SINCE 7/1        172               360    -188      486
COOLING TOTAL      28                10      18        0
 SINCE 1/1       1155               829     326      932

FREEZE DATES
RECORD
 EARLIEST     09/13/1921
 LATEST       06/12/1952
EARLIEST      10/26             10/18
LATEST                          04/29
.................................................................

WIND (MPH)
AVERAGE WIND SPEED              2.1
HIGHEST WIND SPEED/DIRECTION    20/060    DATE  10/25
HIGHEST GUST SPEED/DIRECTION    25/070    DATE  10/25

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.10
NUMBER OF DAYS FAIR           26
NUMBER OF DAYS PC              5
NUMBER OF DAYS CLOUDY          0

AVERAGE RH (PERCENT)     49

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP                0
HEAVY RAIN                0     RAIN                        0
LIGHT RAIN                1     FREEZING RAIN               0
LT FREEZING RAIN          0     HAIL                        0
HEAVY SNOW                0     SNOW                        0
LIGHT SNOW                0     SLEET                       0
FOG                       2     FOG W/VIS <= 1/4 MILE       1
HAZE                      8

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

&&

EXITING A SEPTEMBER WHICH PRODUCED HISTORIC WILDFIRES FOR THE RESIDENTS OF
JACKSON COUNTY, OCTOBER STARTED WITH CRITICAL FIRE WEATHER CONDITIONS AS RECORD
TEMPERATURES WERE SET ACROSS SOUTHWEST OREGON. THE ROGUE VALLEY CONTINUED TO BE
IMPACTED BY SMOKE FROM FIRES IN NORTHERN CALIFORNIA, THOUGH IT WAS NOT AS THICK
AND IMPACTFUL TO AIR QUALITY AS IN SEPTEMBER.

THE FIRST FALL-LIKE PATTERN CHANGE TOOK PLACE ON THE 10TH AND PRODUCED THE ONLY
MEASURABLE RAINFALL FOR THE MONTH. IT WAS SIGNIFICANT THOUGH, AS THE MEASURABLE
RAINFALL AIDED WILDFIRE FIGHTING EFFORTS. AFTER A BRIEF REPRIEVE THANKS TO THE
INCREASED WINDS AND RAIN, SMOKE QUICKLY REFILLED THE VALLEY. THE SMOKE
PARTICLES LIKELY AIDED FOG FORMATION, ACTING AS CONDENSATION NUCLEI, AND
PRODUCED FOG THE NEXT TWO MORNINGS IN MEDFORD. A WEAKER SYSTEM FOLLOWED A FEW
DAYS LATER, BUT HIGH PRESSURE BUILDING OVER THE REGION LIMITED THE FRONTS REACH
AND ONLY A TRACE AMOUNT OF RAIN WAS RECORDED. OCTOBER WOULD QUICKLY RETURN TO
DRY AND WARM CONDITIONS.

WITH LESS SMOKE AND A RIDGE IN PLACE OVER THE REGION, OVERNIGHT LOWS BEGAN TO
DIP INTO THE MID TO LOW THIRTIES DURING THE MORNINGS OF THE 22ND AND 23RD.
THESE WERE THE FIRST WIDESPREAD FROST CONDUCIVE MORNINGS FOR THE ROGUE VALLEY.
FREEZING CONDITIONS THAT OCCURRED ON THE 26TH AND 27TH PROMPTED A DECLARATION
FOR THE END OF THE 2020 GROWING SEASON. THIS WAS CAUSED BY AN ARCTIC AIR MASS
BROUGHT TO THE REGION BY A COLD FRONT ATTACHED TO A TROUGH WHICH DUG OVER
WESTERN IDAHO AND ALSO CREATED A STRONG EAST WIND EVENT WITH THE WINDIEST
CONDITIONS IN THE VALLEY FOR THE MONTH.

$$


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