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

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CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
1152 AM MDT WED OCT 1 2014

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2014

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              97   09/06/2013
                        09/05/2013
                        09/04/1995
 LOW               17   09/29/1985
HIGHEST            94   09/03        91       3       97  09/06
                                                          09/05
LOWEST             33   09/12        35      -2       38  09/28
AVG. MAXIMUM     78.9              78.5     0.4     78.6
AVG. MINIMUM     50.6              48.3     2.3     54.2
MEAN             64.8              63.4     1.4     66.4
DAYS MAX >= 90      2               3.4    -1.4        7
DAYS MAX <= 32      0               0.0     0.0        0
DAYS MIN <= 32      0               0.8    -0.8        0
DAYS MIN <= 0       0               0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.61   2013
 MINIMUM            T   1892
                        1944
TOTALS           1.79              0.96    0.83     5.61
DAILY AVG.       0.06              0.03    0.03     0.19
DAYS >= .01         9               6.5     2.5       10
DAYS >= .10         4               3.3     0.7       10
DAYS >= .50         1               0.6     0.4        3
DAYS >= 1.00        1               0.1     0.9        2
GREATEST
 24 HR. TOTAL    1.01   09/29 TO 09/29           09/14 TO 09/15

SNOWFALL (INCHES)
RECORDS
 TOTAL             17.2   1991
TOTALS              T               1.3     -1.3       0

DEGREE_DAYS
HEATING TOTAL      91               125     -34       83
 SINCE 7/1         98               141     -43       83
COOLING TOTAL      88                76      12      133
 SINCE 1/1        701               764     -63      999

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

WIND (MPH)
AVERAGE WIND SPEED              9.4
RESULTANT WIND SPEED/DIRECTION   3/186
HIGHEST WIND SPEED/DIRECTION    33/350    DATE  09/09
HIGHEST GUST SPEED/DIRECTION    40/360    DATE  09/09

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           13
NUMBER OF DAYS PC             11
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     55

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              3     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       6
LIGHT RAIN                9     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                0     SNOW                       0
LIGHT SNOW                2     SLEET                      0
FOG                       9     FOG W/VIS <= 1/4 MILE      1
HAZE                      3

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

.....SEPTEMBER 2014 SLIGHTLY WARMER AND WETTER THAN AVERAGE.....

UPPER LEVEL LOW PRESSURE OVER THE NORTHERN ROCKIES BROUGHT DRY
WEATHER AND SLIGHTLY BELOW NORMAL TEMPERATURES TO THE FRONT RANGE OF
COLORADO ON THE 1ST. WARMER TEMPERATURES MOVED INTO THE REGION ON
THE 2ND AND 3RD...AS UPPER LEVEL HIGH PRESSURE BUILT OVER THE
SOUTHWESTERN STATES. THE 94 DEGREES RECORDED AT DENVER INTERNATIONAL
AIRPORT ON THE 3RD WAS THE HOTTEST DAY OF THE MONTH. AN UPPER LEVEL
TROUGH OF LOW PRESSURE AND ASSOCIATED COLD FRONT BROUGHT COOLER
TEMPERATURES AND PRECIPITATION TO NORTH CENTRAL AND NORTHEASTERN
COLORADO ON THE 4TH AND 5TH. WARMER AND DRIER WEATHER RETURNED TO
DENVER ON THE 6TH...AS UPPER LEVEL HIGH PRESSURE REBUILT OVER THE
ROCKY MOUNTAIN REGION.

A DEEP UPPER TROUGH OVER THE NORTHERN ROCKIES PUSHED A STRONG COLD
FRONT INTO NORTHEASTERN COLORADO ON THE 11TH...WHICH RESULTED IN
VERY COOL TEMPERATURES EAST OF THE MOUNTAINS ON THE 11TH AND 12TH.
THE 12TH WAS THE COLDEST DAY OF THE MONTH WITH MAXIMUM AND MINIMUM
TEMPERATURES OF 48 AND 33 DEGREES RESPECTIVELY. DENVER INTERNATIONAL
AIRPORT ALSO REPORTED A TRACE OF SNOW ON THE MORNING OF THE
12TH...WITH BOULDER AND SOME FOOTHILL LOCATIONS WEST OF DENVER
MEASURING ONE HALF INCH OF SNOW.

TEMPERATURES QUICKLY REBOUNDED TO ABOVE NORMAL VALUES BY THE
14TH...AS UPPER LEVEL PRESSURE REESTABLISHED OVER COLORADO. VERY
WARM TEMPERATURES CONTINUED THROUGH THE 19TH...WITH 90 DEGREES
RECORDED ON THE 18TH. THIS MOST LIKELY WILL BE THE LAST 90 DEGREE
DAY FOR 2014. A WEAK COOL FRONT BROUGHT COOLER TEMPERATURES ON THE
21ST...HOWEVER TEMPERATURES REMAINED AT ABOVE NORMAL VALUES THROUGH
THE 28TH.

A DEEP AND POWERFUL STORM SYSTEM TRACKED FROM CENTRAL CALIFORNIA
ACROSS NEVADA...UTAH AND NORTHERN COLORADO LATE IN THE MONTH. THIS
STORM SYSTEM BROUGHT VERY HEAVY RAIN AND SEVERE WEATHER TO MUCH OF
NORTHEASTERN COLORADO...WITH 1.01 INCHES OF RAIN MEASURED AT DENVER
INTERNATIONAL AIRPORT DURING THE LATE AFTERNOON AND EVENING OF THE
29TH. LARGE HAIL ALSO WAS REPORTED ACROSS SOUTHERN PORTIONS OF THE
DENVER METRO AREA. THE MONTH ENDED ON A COOLER AND DRIER NOTE AS THE
STORM SYSTEM MOVED EAST OF THE STATE.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH OF SEPTEMBER WAS 64.8 DEGREES F WHICH WAS 1.4 DEGREES ABOVE
NORMAL. SEPTEMBER OF 1948 WAS THE WARMEST SEPTEMBER ON RECORD...WITH
AN AVERAGE TEMPERATURE OF 68.3 DEGREES F.  THE COLDEST SEPTEMBER ON
RECORD WAS 54.8 DEGREES F BACK IN 1912. THERE WERE ONLY TWO DAYS IN
WHICH THE MAXIMUM TEMPERATURE REACHED OR EXCEEDED 90 DEGREES...AND
NO DAYS IN WHICH THE TEMPERATURE REACHED THE CENTURY MARK. THE
HIGHEST TEMPERATURE OF THE MONTH WAS 94 DEGREES WHICH OCCURRED ON
THE 3RD. THE COLDEST TEMPERATURE WAS WAS 33 DEGREES ON THE MORNING
OF THE 12TH.

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF SEPTEMBER AT DENVER INTERNATIONAL
AIRPORT WAS 1.79 INCHES...WHICH IS 0.83 INCHES ABOVE THE NORMAL OF
0.96 INCHES. THERE WERE 9 DAYS WITH MEASURABLE PRECIPITATION. ON THE
29TH...1.01 INCHES OF PRECIPITATION FELL WHICH IS THE GREATEST DAILY
AMOUNT FOR THE MONTH.

TEN WETTEST SEPTEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

5.61 INCHES 2013
4.67 INCHES 1961
3.78 INCHES 1909
3.70 INCHES 1902
3.42 INCHES 2012
2.89 INCHES 1875, 1918, 1936
2.85 INCHES 1971, 1973

TEN DRIEST SEPTEMBER`S IN DENVER WEATHER HISTORY SINCE 1872:

 T   INCHES 1892, 1944
0.01 INCHES 1956, 1992
0.02 INCHES 1879, 1921
0.05 INCHES 1893
0.06 INCHES 1882, 1920, 2010

THERE WERE 3 DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT...NO DAYS WITH HAIL AND 1 DAY WITH DENSE FOG
WITH A VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND
OF 40 MPH FROM A NORTHERLY DIRECTION WAS RECORDED ON THE 9TH.

$$



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