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

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CXUS55 KBOU 011711
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
1010 AM MST SUN JAN 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE YEAR OF 2016...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2016

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             105   06/26/2012 06/25/2012
                        07/20/2005 08/08/1878
 LOW              -29   01/09/1875
HIGHEST           102   07/10/2016                   98  08/15
LOWEST            -15   12/17/2016                  -10  01/04
AVG. MAXIMUM     66.7              64.7     2.0     65.4
AVG. MINIMUM     38.0              36.3     1.7     38.6
MEAN             52.3              50.5     1.8     52.0
DAYS MAX >= 90     55              39.6    15.4       48
DAYS MAX <= 32     14              20.0    -6.0       29
DAYS MIN <= 32    138             156.9   -18.9      126
DAYS MIN <= 0       4               5.8    -1.8        7

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        23.31   1967
 MINIMUM         7.29   2008
TOTALS          11.85             14.30   -2.45    18.31
DAILY AVG.       0.03              0.03    0.00     0.05
DAYS >= .01        71              79.7    -8.7      107
DAYS >= .10        32              34.9    -2.9       49
DAYS >= .50         5               7.6    -2.6       10
DAYS >= 1.00        2               2.3    -0.3        2
GREATEST
 24 HR. TOTAL    1.38   2016                5/26 TO 5/27
                 1.22   2016                4/15 TO 4/16
                 0.77   2016                3/23 TO 3/23
SNOWFALL RECORDS JANUARY THROUGH DECEMBER TOTALS
               MAXIMUM           MINIMUM
                115.9   1913       18.9    1887
                112.0   1959       21.5    1888
                 99.2   1929       21.8    1890
 24 HR TOTAL     23.6   12/24/1982 TO 12/24/1982

TOTALS           61.6              53.8     7.8     64.4
 LIQUID EQUIV    6.16              5.40    0.76     6.44
SINCE 7/1        11.4              22.5   -11.1     22.6
 LIQUID 7/1      1.14              2.20   -1.06     2.26
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE      37              33.3     3.7       51
DAYS >= 1.0        13              16.3    -3.3       25
GREATEST
 SNOW DEPTH        10   03/24                          9  02/23
 24 HR TOTAL     13.1   03/23
                 11.8   04/16
                  6.9   02/01

 STORM TOTAL     13.1   03/23

DEGREE_DAYS
HEATING TOTAL    5415              6059    -644     5479
 SINCE 7/1       2042              2468    -426     5575
COOLING TOTAL     878               769     109      877
 SINCE 1/1        878               769     109      877

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

WIND (MPH)
AVERAGE WIND SPEED              10.0
RESULTANT WIND SPEED/DIRECTION   2/194
HIGHEST WIND SPEED/DIRECTION    54/340    DATE  07/24
HIGHEST GUST SPEED/DIRECTION    74/340    DATE  07/24

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           94
NUMBER OF DAYS PC            210
NUMBER OF DAYS CLOUDY         62

AVERAGE RH (PERCENT)     50

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                3     RAIN                      13
LIGHT RAIN               72     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       4
HEAVY SNOW                5     SNOW                      17
LIGHT SNOW               39     SLEET                      0
FOG                      80     FOG W/VIS <= 1/4 MILE     26
HAZE                     33

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

..........2016 CLIMATE YEAR IN REVIEW...........

THE YEAR OF 2016 IN DENVER, THE FRONT RANGE AND NORTHERN COLORADO,
WAS A TRANSITION FROM STRONG EL NINO CONDITIONS OVER TO WEAK LA NINA
AND INTO THE CURRENT ENVIRONMENT WHICH IS ENSO NEUTRAL. AS EL NINO
CONDITIONS WEAKENED FROM MID-WINTER THROUGH LATE SPRING 2016,
TEMPERATURES CAME IN WARMER THAN AVERAGE FOR JANUARY THROUGH MARCH
ALONG WITH NEAR TO SLIGHTLY ABOVE NORMAL PRECIPITATION FOR THE THREE
MONTHS. DENVER`S WETTEST MONTH OF 2016 ARRIVED IN APRIL WITH 2.56
INCHES OF PRECIPITATION ALONG WITH 18.4 INCHES OF SNOW. TEMPERATURES
FOR THEN COOLED TO NEAR AVERAGE FOR APRIL AHEAD OF ABOVE AVERAGE
PRECIPITATION AND FURTHER COOLING INTO MAY. MAY WAS THE SECOND
WETTEST MONTH OF 2016 AND ALSO HAD THE COLDEST MONTHLY DEPARTURE
FROM AVERAGE FOR THE YEAR AT 2.7 DEGREES BELOW DENVER`S MONTHLY MAY
NORMAL.

WITH WATER TEMPERATURE CONDITIONS RAPIDLY CHANGING IN THE EQUATORIAL
PACIFIC REGION IN THE FIRST HALF OF 2016, NORTHERN COLORADO AND THE
HIGH PLAINS STATES TRANSITIONED INTO A DIFFERENT PATTERN AS WELL.
THE FIVE MONTHS OF JUNE THROUGH OCTOBER ALL REGISTERED PRECIPITATION
TOTALS BELOW THEIR MONTHLY AVERAGE. AUGUST RECEIVED A MERE 0.22
INCHES OF PRECIPITATION IN DENVER WHICH WAS 1.47 INCHES BELOW
AVERAGE AND WAS THE LOWEST PERCENTAGE OF NORMAL OF ALL MONTHS OF
2016 AT 13 PERCENT.

AS A LARGE AND STRONG RIDGE OF HIGH PRESSURE PERSISTED ACROSS THE
CENTRAL AND SOUTHERN ROCKIES FROM MID SUMMER INTO MID FALL,
TEMPERATURES REFLECTED THIS WITH OCTOBER AND NOVEMBER LANDING WELL
ABOVE THEIR MONTHLY AVERAGE TEMPERATURES. BOTH OCTOBER AND NOVEMBER
IN DENVER CAME IN WITH MONTHLY TEMPERATURE DEPARTURES OF 6.9 AND 6.8
DEGREES ABOVE AVERAGE RESPECTIVELY. PRECIPITATION ALSO HELD BELOW
NORMAL FOR THESE TWO MONTHS AS WELL WITH 0.26 INCHES IN OCTOBER AND
0.52 INCHES IN NOVEMBER. HOWEVER, WITH TWO MOIST AND WINTER-LIKE
PACIFIC DISTURBANCES IN MID NOVEMBER, THE DEPARTURE FROM NORMAL IN
NOVEMBER WAS ONLY -0.09 OR 85 PERCENT OF AVERAGE.

AS METEOROLOGISTS OBSERVED THE DEVELOPING NORTHERN HEMISPHERIC
PATTERN FROM LATE NOVEMBER INTO EARLY DECEMBER, IT WAS CLEAR THAT A
CHANGE FOR THE COLDER WAS COMING TO MUCH OF THE UNITED STATES,
INCLUDING DENVER. IN EARLY DECEMBER, WINDS ALOFT BROADLY EXTENDED
LONGITUDINALLY FROM THE ARCTIC REGION NORTH OF SIBERIA, ACROSS THE
NORTH POLE REGION AND INTO SOUTHERN CANADA. FRIGID ARCTIC AIR WAS
BROUGHT SOUTHWARD INTO CANADA AND ACROSS MUCH OF THE CENTRAL UNITED
STATES AS A RESULT. THIS WAS FOLLOWED BY ANOTHER PATTERN OF
PERSISTENT NORTHERLY WINDS ALOFT ACROSS NORTHERN LATITUDES WHICH
USHERED IN ANOTHER PERIOD OF COLD AND SNOWFALL AHEAD OF THE
CHRISTMAS HOLIDAY. THESE TWO SYSTEMS WERE ENOUGH TO BRING DECEMBER`S
AVERAGE MONTHLY TEMPERATURE DOWN TO -2.2 BELOW NORMAL ALONG WITH
ABOVE AVERAGE PRECIPITATION AND SNOWFALL.

WHEN 2016 ENDED, THE AVERAGE ANNUAL TEMPERATURE FOR DENVER FINALIZED
AT 52.3 DEGREES, WHICH IS 1.8 DEGREES ABOVE THE 1981-2010 ANNUAL
AVERAGE OF 50.5 DEGREES. THIS RANKS AS 14TH WARMEST IN DENVER`S 145
YEAR TEMPERATURE HISTORY. THE WARMEST YEAR IN DENVER`S WEATHER
HISTORY WAS IN 1934 WITH AN AVERAGE ANNUAL TEMPERATURE OF 54.8
DEGREES. THE COLDEST YEAR WAS 1912 WITH AN ANNUAL AVERAGE OF 47.6
DEGREES.

FOR THE PRECIPITATION CATEGORY, 2016 IN DENVER WAS ON THE DRY SIDE
OF THE 1981-2010 ANNUAL AVERAGE. THE YEAR ENDED WITH 11.85 INCHES OF
PRECIPITATION WHICH WAS 2.45 INCHES BELOW THE ANNUAL NORMAL OF 14.30
INCHES, OR 83 PERCENT OF NORMAL. THE ANNUAL TOTAL OF 11.85 INCHES
RANKS AS 37TH DRIEST IN DENVER`S 145 YEAR WEATHER HISTORY. THE
WETTEST YEAR IN DENVER`S WEATHER HISTORY WAS IN 1967 WHEN 23.31
INCHES OF PRECIPITATION FELL. DENVER`S DRIEST YEAR OCCURRED IN 2002
WHEN ONLY 7.48 INCHES OF PRECIPITATION WAS RECORDED.

$$


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