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

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CXUS55 KBOU 050054
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
555 PM MST FRI JAN 4 2019

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

...THE DENVER CO CLIMATE SUMMARY FOR THE YEAR OF 2018...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2019

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             105   06/28/2018
                        06/26/2012
                        06/25/2012
 LOW              -29   01/09/1875
HIGHEST           105R  06/28                        100  07/19
                                                          07/06
LOWEST             -7   02/21                         -7  01/06
AVG. MAXIMUM     66.4              64.7     1.7     67.4
AVG. MINIMUM     37.5              36.3     1.2     38.3
MEAN             52.0              50.5     1.5     52.8
DAYS MAX >= 90     59              39.6    19.4       48
DAYS MAX <= 32     16              20.0    -4.0       16
DAYS MIN <= 32    162             156.9     5.1      144
DAYS MIN <= 0       6               5.8     0.2        3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        23.31   1967
 MINIMUM         7.29   2008
TOTALS           8.53             14.30   -5.77    11.69
DAILY AVG.       0.02              0.03   -0.01     0.03
DAYS >= .01        73              79.7    -6.7       74
DAYS >= .10        27              34.9    -7.9       40
DAYS >= .50         0               7.6    -7.6        5
DAYS >= 1.00        0               2.3    -2.3        1

SNOWFALL (INCHES)
RECORDS
 ANNUAL TOTAL   115.9   1913
 24 HR TOTAL     23.6   12/24/1982

2018
TOTALS           27.1              53.8   -26.7     17.2
 LIQUID EQUIV    2.71              5.40   -2.69     1.72
SINCE 7/1         8.2              22.5   -14.3      6.8
 LIQUID 7/1      0.82              2.20   -1.38     0.68
DAYS >= TRACE      62              33.3    28.7       44
DAYS >= 1.0         9              16.3    -7.3        7

DEGREE_DAYS
HEATING TOTAL    5632              6059    -427     5217
 SINCE 7/1       2706              2468     238     2150
COOLING TOTAL    1026               769     257      881
 SINCE 1/1       1026               769     257      881

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

WIND (MPH)
AVERAGE WIND SPEED              10.2
RESULTANT WIND SPEED/DIRECTION   2/187
HIGHEST WIND SPEED/DIRECTION    48/330    DATE  11/24
HIGHEST GUST SPEED/DIRECTION    70/280    DATE  04/17

SKY COVER
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR          100
NUMBER OF DAYS PC            207
NUMBER OF DAYS CLOUDY         58

AVERAGE RH (PERCENT)     51

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

............2018 ANNUAL CLIMATE SUMMARY FOR DENVER...........
.......6TH DRIEST AND TIED FOR 20TH WARMEST YEAR ON RECORD.......

DENVER BEGAN 2018 UNDER THE INFLUENCE OF WEAK LA NINA CONDITIONS
WHICH TRANSITIONED INTO A NEUTRAL ENSO ENVIRONMENT (EL NINO -
SOUTHERN OSCILLATION) BY SPRING. THIS NEUTRAL ENSO ENVIRONMENT
PERSISTED INTO THE SUMMER MONTHS BEFORE WEAK EL NINO CONDITIONS
DEVELOPED OVER THE EQUATORIAL PACIFIC OCEAN. IN GENERAL, LA NINA
CONDITIONS BRING DRIER THEN NORMAL CONDITIONS TO THE FRONT RANGE AND
EASTERN PLAINS OF COLORADO, ESPECIALLY IN WINTER MONTHS, WITH NEAR
TO ABOVE NORMAL PRECIPITATION OFTEN EXPERIENCED IN THE EL NINO
ENVIRONMENTS.

FOR THE WEATHER PARAMETERS OF TEMPERATURE AND PRECIPITATION, 2018
ENDED 6TH DRIEST ALONG WITH A TIE FOR 20TH WARMEST. MOST MONTHS HAD
BELOW NORMAL PRECIPITATION WITH THE EXCEPTION OF JANUARY AND MARCH
WHICH WERE ONLY SLIGHTLY ABOVE NORMAL. DURING THE YEAR, THERE WERE
NO DAYS AT THE DENVER INTERNATIONAL AIRPORT WITH PRECIPITATION
AMOUNTS EQUAL OR GREATER THAN ONE HALF INCH. ONLY 8.53 INCHES OF
PRECIPITATION FELL WHICH IS 5.77 INCHES BELOW THE NORMAL OF 14.30
INCHES. THIS MAKES 2018 THE 6TH DRIEST YEAR ON RECORD. IN ADDITION,
SNOWFALL THROUGHOUT THE YEAR WAS ALSO LACKING WITH ONLY 27.1 INCHES
MEASURED.

THE AVERAGE TEMPERATURE FOR THE YEAR WAS 52.0 DEGREES F WHICH IS 1.5
DEGREES ABOVE THE 147 YEAR AVERAGE OF 50.5. DRY CONDITIONS OFTEN
COINCIDE WITH ABOVE AVERAGE TEMPERATURES, AND THIS WAS CERTAINLY THE
CASE IN 2018 FOR THE HIGH PLAINS REGION INCLUDING METRO DENVER. MOST
NOTABLE WERE THE MONTHS OF MAY, JUNE AND SEPTEMBER WHERE ALL THREE
LANDED IN THEIR RESPECTIVE TOP 10 WARMEST MONTH CATEGORY. MAY WAS
THE 8TH WARMEST IN THE DENVER`S 147 YEAR HISTORY WITH JUNE AND
SEPTEMBER ENDING 7TH AND 6TH WARMEST RESPECTIVELY.

THERE WERE 59 DAYS DURING THE YEAR IN WHICH THE TEMPERATURE EQUALED
OR EXCEEDED THE 90 DEGREE MARK. THIS NEARLY DOUBLES THE AVERAGE OF
90 DEGREE DAYS SINCE 1872 WHICH IS 30 DAYS. 2012 STILL HOLDS THE
RECORD FOR THE NUMBER OF DAYS AT OR ABOVE 90 DEGREES WITH 73.

THE COLDEST TEMPERATURE OF THE YEAR WAS -7 DEGREES F ON FEBRUARY
21ST. ON JUNE 28TH, THE TEMPERATURE IN DENVER SOARED TO 105 DEGREES
F WHICH EQUALS THE HIGHEST TEMPERATURE EVER RECORDED IN DENVER. THE
105 DEGREE TEMPERATURE WAS ALSO RECORDED BACK ON THE FOLLOWING
DATES: AUGUST 8TH, 1878, JULY 20TH, 2005, JUNE 25TH, 2012, AND JUNE
26TH, 2012.

NO MAJOR HAIL EVENTS OCCURRED STRUCK THE DENVER AREA TO THE EXTEND
OF WHICH OCCURRED IN MAY OF 2015 WHERE A MAJOR AND VERY COSTLY
AFTERNOON AND HAIL POUNDED WESTERN PORTIONS OF METRO DENVER. IN
ADDITION, IT WAS FAIRLY UNEVENTFUL FOR EXCESS RAIN AND FLOODING. AS
IS TYPICAL IN METRO DENVER, THERE WERE A FEW AFTERNOON WHERE MAJOR
INTERSECTIONS AND ROADWAYS WERE BRIEFLY CLOSED DUE TO BRIEF HEAVY
RAIN FROM PASSING AFTERNOON SUMMER THUNDERSTORMS. NO MAJOR TRAVEL
AND COMMERCE HINDERING WINTER STORM SYSTEM OCCURRED IN 2018 FOR
DENVER OR THE FRONT RANGE.

$$


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