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

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CXUS55 KBOU 011239
CLMDEN

...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 RECIEVED THEIR FIRST MEASUREABLE 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 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 DROPPED DOWN FROM WITH A SURFACE
TROUGH OVER SOUTHEASTERN PORTIONS OF THE STATE BRINGING TEMPERATURES
DOWN TO THE LOWER 40S AND OUR SECOND DOSE OF MEASUREABLE 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 OCCURED
ON THE MORNING OF THE 18TH.

TOP FIVE SNOWEST 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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