Climatological Report (Monthly)
Issued by NWS Denver/Boulder, CO

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CXUS55 KBOU 011446 RRA
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
240 AM MDT FRI NOV 1 2013

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF OCTOBER 2013...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2013

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              90   10/01/1892
 LOW               -2   10/29/1917
HIGHEST            79   10/08        90     -11       83  10/03
LOWEST             27   10/16        -2      29       24  10/27
                        10/05
AVG. MAXIMUM     60.0              65.3    -5.3     62.2
AVG. MINIMUM     35.5              36.6    -1.1     35.9
MEAN             47.7              50.9    -3.2     49.0
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      0               0.4    -0.4        1
DAYS MIN <= 32     12               8.5     3.5       11
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         4.17   1969
 MINIMUM            T   1934
TOTALS           0.72              1.02   -0.30     1.22
DAILY AVG.       0.02              0.03   -0.01     0.04
DAYS >= .01         8               5.3     2.7        5
DAYS >= .10         3               2.4     0.6        3
DAYS >= .50         0               0.5    -0.5        2
DAYS >= 1.00        0               0.1    -0.1        0
GREATEST
 24 HR. TOTAL    0.25   10/18 TO 10/18           10/24 TO 10/25
                        10/03 TO 10/04                    10/25 TO 10/25
                                                          10/25 TO 10/25
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    10/25(00) TO 10/25(00)
                                                 10/25(00) TO 10/25(00)5
                                                 10/25(00) TO 10/25(00)5

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            1.4               4.0

DEGREE_DAYS
HEATING TOTAL     525               440      85      488
 SINCE 7/1        608               581      27      557
COOLING TOTAL       0                 5      -5        1
 SINCE 1/1        999               769     230     1236

FREEZE DATES
RECORD
 EARLIEST     09/08/1962
 LATEST       06/08/2007
EARLIEST      10/04             10/07
LATEST                          05/05
......................................................

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   1/180
HIGHEST WIND SPEED/DIRECTION    40/270    DATE  10/10
HIGHEST GUST SPEED/DIRECTION    48/270    DATE  10/10

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           12
NUMBER OF DAYS PC             14
NUMBER OF DAYS CLOUDY          5

AVERAGE RH (PERCENT)     61

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       3
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       0
HEAVY SNOW                1     SNOW                       2
LIGHT SNOW                4     SLEET                      0
FOG                      13     FOG W/VIS <= 1/4 MILE      9
HAZE                      4

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

...OCTOBER 2013 A MONTH OF COOL TEMPERATURES...

OCTOBER 2013

ZONAL FLOW DOMINATED MUCH OF THE WEATHER PATTERN DURING THE
BEGINNING OF THE MONTH WITH HIGH TEMPERATURES IN THE MID 70S FOR THE
FIRST FEW DAYS. AROUND THE 3RD OF THE MONTH A LOW PRESSURE SYSTEM
DROPPED DOWN FROM CANADA AND THE NORTHWESTERN UNITED STATES BRINGING
MUCH COOLER AIR DOWN INTO COLORADO. A FRONT MOVED THROUGH THE STATE
DROPPING SNOW OVER THE MOUNTAINS AND MUCH OF THE FOOTHILLS AND METRO
AREA. MANY PLACES RECEIVED THEIR FIRST MEASURABLE SNOW OF THE
SEASON ON THIS DAY. AS THAT LOW PRESSURE SYSTEM MOVED NORTHEAST OUT
OF THE AREA IT WAS REPLACED BY EXTENSIVE RIDGING THAT WAS THE CAUSE
OF A DEEPLY ROOTED HIGH PRESSURE SYSTEM OVER MUCH OF THE SOUTHWEST
AND PACIFIC REGION. THIS STAYED IN PLACE FOR THE NEXT FEW DAYS
BRINGING HIGH TEMPERATURES BACK INTO THE UPPER 70S FOR MUCH OF THE
STATE. AROUND THE 10TH OF THE MONTH ANOTHER LOW PRESSURE SYSTEM
DROPPED DOWN FROM THE NORTHWEST INTO PORTIONS OF SOUTHERN NEVADA AND
THE DESERT SOUTHWEST. AS THE SYSTEM MADE A SHARP TURN INTO THE
COLORADO REGION IT BROUGHT COOLER TEMPERATURES AND PRECIPITATION. AS
THE SYSTEM EXITED IT WAS REPLACED BY A MORE ZONAL PATTERN WITH A
SURFACE HIGH PRESSURE THAT KEPT TEMPERATURES IN THE UPPER 60S. AN
UPPER LEVEL TROUGH AND SURFACE FRONT MOVED IN ON THE 14TH DROPPING
THE TEMPERATURE 15 DEGREES AND A TENTH OF AN INCH OF SNOW AT THE
AIRPORT. THE SURFACE LOW STAYED AROUND FOR A FEW DAYS AS THE UPPER
LEVEL LOW CENTERED ITSELF OVER THE CENTRAL UNITED STATES DROPPING
THE TEMPERATURE ANOTHER 10 DEGREES FOR A HIGH OF 43 ON THE 15TH.
OVER THE NEXT FEW DAYS A COLD CORE HIGH SET-UP FORMED WITH A TROUGH
IN THE UPPER LEVELS AND A SURFACE HIGH PRESSURE OVER THE REGION
BRINGING DRY CONDITIONS AND COOLER TEMPERATURES FOR THE NEXT FEW
DAYS. ON THE 18TH A COLD FRONT MOVED THROUGH WITH A STATIONARY
BOUNDARY BRINGING TEMPERATURES DOWN TO THE LOWER 40S AND OUR SECOND
DOSE OF MEASURABLE SNOW TO DENVER. DENVER INTERNATIONAL AIRPORT
REPORTED 1.4 INCHES OF SNOW DURING THIS TIME. NORTHWEST FLOW
DOMINATED OVER THE NEXT FEW DAYS KEEPING TEMPERATURES IN THE MID TO
UPPER 50S AND LOWER 60S. A HIGH PRESSURE SYSTEM STARTED TO BUILD IN
OVER THE WEST COAST AROUND THE 20TH OF THE MONTH BRINGING WARMER
TEMPERATURES AND DRY CONDITIONS TO OUR REGION WITH TEMPERATURES ONCE
AGAIN REACHING INTO THE LOWER 70S. THIS PATTERN PERSISTED UNTIL THE
27TH WHEN A LOW FROM THE PACIFIC MOVED EASTWARD OVER EASTERN NEVADA
AND A SURFACE COLD FRONT DROPPED DOWN INTO COLORADO BRINGING A TRACE
OF SNOW TO THE AIRPORT AND BELOW NORMAL TEMPERATURES. OVER THE NEXT
FEW DAYS OF THE MONTH IT CONTINUED TO TRACK TO THE NORTHWEST
BRINGING COOL AND CLOUDY CONDITIONS. INCREASED MOISTURE AND DROPPING
TEMPERATURES ALSO BROUGHT HEAVY FOG TO THE AREA AND HIGH WINDS ON
HALLOWEEN INTO THE EVENING AS THE SYSTEM EXITED.



TEMPERATURES:

THE AVERAGE TEMPERATURE FOR THE MONTH OF OCTOBER WAS 47.7 DEGREES F
WHICH WAS 3.2 DEGREES BELOW NORMAL. OCTOBER OF 1950 WAS THE WARMEST
OCTOBER ON RECORD WITH AN AVERAGE TEMPERATURE OF 59.9 DEGREES F. THE
COLDEST OCTOBER ON RECORD WAS 39.0 DEGREES F BACK IN 1969.

THE HIGHEST TEMPERATURE OF THE MONTH WAS 79 DEGREES WHICH OCCURRED
ON THE 8TH...AND THE COLDEST TEMPERATURE OF THE MONTH WAS 27 DEGREES
ON THE EVENING OF THE 5TH AND THE 16TH.

BELOW IS A LIST OF RECORDS FOR OCTOBER 2013:

DAILY TEMPERATURE RECORDS:

  DATE      TEMPERATURE   TYPE OF RECORD    OLD RECORD   YEAR LAST
SET

OCTOBER 5TH    28 DEGREES   TIED RECORD LOW    28 DEGREES      1877

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF OCTOBER WAS 0.72 INCHES...WHICH IS
0.30 INCHES BELOW THE NORMAL 0F 1.02 INCHES. SNOWFALL FOR THE MONTH
WAS 1.4 INCHES RECORDED AT DENVER INTERNATIONAL AIRPORT. IT OCCURRED
ON THE MORNING OF THE 18TH.

TOP FIVE SNOWIEST OCTOBERS

PRECIPITATION   YEAR

31.2 INCHES     1969
22.7 INCHES     1906
22.1 INCHES     1997
17.8 INCHES     1923
17.2 INCHES     2009
$$



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