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

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642
CXUS55 KBOU 012143
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
243 PM MST WED MAR 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF FEBRUARY 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2017

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              80   02/10/2017
 LOW              -25   02/01/1951
                        02/08/1936
HIGHEST            80R  02/10        66      14       73  02/18
LOWEST             11   02/26        -1      12        1  02/03
AVG. MAXIMUM     53.9              46.2     7.7     52.2
AVG. MINIMUM     26.6              18.9     7.7     23.4
MEAN             40.2              32.5     7.7     37.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      3               3.9    -0.9        3
DAYS MIN <= 32     21              26.9    -5.9       25
DAYS MIN <= 0       0               1.3    -1.3        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.01   1934
 MINIMUM         0.01   1970
TOTALS           0.23              0.37   -0.14     0.48
DAILY AVG.       0.01              0.01    0.00     0.02
DAYS >= .01         3               5.3    -2.3        2
DAYS >= .10         1               0.7     0.3        2
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.18   02/23 TO 02/24           02/01 TO 02/02

SNOWFALL (INCHES)
RECORDS
 TOTAL            1.6               5.7
RECORD FEBRUARY   22.4                      2015

DEGREE_DAYS
HEATING TOTAL     685               908    -223      780
 SINCE 7/1       3802              4439    -637     3988
COOLING TOTAL       0                 0       0        0
 SINCE 1/1          0                 0       0        0

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

WIND (MPH)
AVERAGE WIND SPEED              10.9
RESULTANT WIND SPEED/DIRECTION   3/211
HIGHEST WIND SPEED/DIRECTION    35/240    DATE  02/10
HIGHEST GUST SPEED/DIRECTION    58/240    DATE  02/10

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            9
NUMBER OF DAYS PC              7
NUMBER OF DAYS CLOUDY         12

AVERAGE RH (PERCENT)     47

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

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

...FEBRUARY 2017 TIED FOR THE 6TH WARMEST FEBRUARY IN DENVER WEATHER
HISTORY...

THE FIRST THREE DAYS OF THE MONTH STARTED OUT ON THE COLD SIDE AS A
SERIES OF COLD FRONTS MOVED ACROSS NORTHEASTERN COLORADO. SHALLOW
WEAK UPSLOPE FLOW RESULTED IN FOG, LIGHT SNOW AND FREEZING DRIZZLE
ACROSS MUCH OF NORTHEASTERN COLORADO INCLUDING THE DENVER METRO
AREA. DENVER EXPERIENCED UNSEASONABLY WARM TEMPERATURES AS WELL AS
DRY AND BREEZY CONDITIONS FROM THE 4TH THROUGH THE 10TH AS UPPER
LEVEL HIGH PRESSURE AND DOWNSLOPE WESTERLY FLOW DOMINATED THE EAST
SLOPES OF THE COLORADO ROCKIES. THE 10TH WAS THE WARMEST AND
WINDIEST DAY OF THE PERIOD WITH A HIGH TEMPERATURE OF 80 DEGREES AND
A WIND GUST OF 58 MPH MEASURED AT DENVER INTERNATIONAL AIRPORT. THE
80 DEGREES READING IS THE WARMEST TEMPERATURE EVER RECORDED IN
DENVER DURING THE MONTH OF FEBRUARY, BREAKING THE OLD RECORD OF 77
DEGREES LAST SET ON FEBRUARY 4TH, 1890.

A DRY COLD FRONT AND UPPER LEVEL TROUGH OF LOW PRESSURE BROUGHT
TEMPERATURES BACK TO MORE SEASONABLE VALUES FROM THE 11TH THROUGH
THE 14TH. SIGNIFICANTLY ABOVE NORMAL TEMPERATURES RETURNED TO
NORTHEASTERN COLORADO ON THE 15TH AND CONTINUED THROUGH THE 21ST AS
UPPER LEVEL HIGH PRESSURE REBUILT OVER THE ROCKY MOUNTAIN REGION.
DURING THIS PERIOD, DENVER BROKE THREE DAILY HIGH TEMPERATURE
RECORDS.

MUCH MORE WINTER-LIKE WEATHER MOVED INTO NORTHEASTERN COLORADO ON THE
23RD AND 24TH AS AN UPPER LEVEL TROUGH OF LOW PRESSURE AND
ASSOCIATED COLD FRONT MOVED ACROSS THE REGION. DENVER MEASURED 1.6
INCHES OF SNOW WITH THIS SYSTEM WHICH WAS THE FIRST MEASURABLE
PRECIPITATION (SNOWFALL) IN 37 DAYS. THE FINAL WEEK OF FEBRUARY SAW
BELOW NORMAL TEMPERATURES WITH SOME LIGHT SNOW ON THE 28TH.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH WAS 40.3 DEGREES F, WHICH IS 7.8 DEGREES ABOVE NORMAL.
FEBRUARY 2017 WAS ON PACE TO BE THE WARMEST FEBRUARY ON RECORD FOR
DENVER THROUGH THE FIRST 22 DAYS OF THE MONTH WITH AN AVERAGE
TEMPERATURE OF 43.8 DEGREES F. HOWEVER, MUCH COLDER TEMPERATURES THE
FINAL 6 DAYS OF THE MONTH RESULTED IN THE MONTH ONLY BEING TIED FOR
THE 6TH WARMEST ON RECORD. THE WARMEST FEBRUARY ON RECORD OCCURRED
IN 1954 WITH AN AVERAGE MONTHLY TEMPERATURE OF 43.7 DEGREES F.

THE COLDEST FEBRUARY ON RECORD WAS 17.7 DEGREES F WAY BACK IN 1899.
ON THE 10TH, THE TEMPERATURE CLIMBED TO 80 DEGREES F WHICH IS THE
HIGHEST TEMPERATURE OF THE MONTH AND FOR THE MONTH OF FEBRUARY. THE
COLDEST TEMPERATURE OF 11 DEGREES F OCCURRED ON THE MORNING OF THE
26TH. DURING THE MONTH THERE WERE TWO DAYS IN WHICH THE MAX
TEMPERATURE DID NOT REACH 32 DEGREES F AND NO DAYS IN WHICH THE
TEMPERATURE DROPPED BELOW ZERO.

RECORDS:

  DATE    TEMPERATURE   TYPE OF RECORD   OLD RECORD   YEAR LAST SET

FEB 10TH  80 DEGREES*  RECORD HIGH MAX   71 DEGREES       1951
FEB 15TH  67 DEGREES   RECORD HIGH MAX   66 DEGREES       1986
FEB 16TH  75 DEGREES   RECORD HIGH MAX   70 DEGREES       1970
FEB 21ST  73 DEGREES   RECORD HIGH MAX   71 DEGREES       1995

* WARMEST FEBRUARY TEMPERATURE IN DENVER WEATHER HISTORY (1872-2017)

TEN WARMEST FEBRUARY`S IN DENVER WEATHER HISTORY SINCE 1872:

43.7 1954
42.3 1930
41.0 1925
40.7 1957
40.5 1943
40.3 2017...1991...1907
40.1 1992...1904

TEN COLDEST FEBRUARY`S IN DENVER WEATHER HISTORY SINCE 1872:

17.7 1899
21.8 1913
22.2 1883
22.3 1989
22.7 1903
23.6 1929
24.1 1942
24.8 1960
24.9 1894
25.2 1905

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF FEBRUARY AT DENVER INTERNATIONAL
AIRPORT WAS 0.23 INCHES, WHICH IS 0.14 INCHES BELOW THE NORMAL OF
0.37 INCHES. THERE WERE 3 DAYS WITH MEASURABLE PRECIPITATION DURING
THE MONTH. 0.16 INCHES OF PRECIPITATION FELL ON THE 23RD, WHICH IS
THE GREATEST DAILY AMOUNT FOR THE MONTH. 1.6 INCHES OF SNOW WAS
MEASURED DURING THE MONTH, WHICH IS 4.1 INCHES BELOW THE NORMAL OF
5.7 INCHES.

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

2.01 INCHES 1934
1.66 INCHES 1960
1.44 INCHES 1942
1.39 INCHES 1953
1.35 INCHES 1909
1.34 INCHES 1912
1.31 INCHES 1959
1.28 INCHES 1966...1939
1.27 INCHES 1965

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

0.01 INCHES 1970
0.02 INCHES 2005
0.03 INCHES 1916
0.04 INCHES 2009...1954...1925...1908
0.06 INCHES 1906...1901
0.07 INCHES 1983

TEN SNOWIEST FEBRUARY`S IN DENVER WEATHER HISTORY SINCE 1872:

22.4 INCHES 2015
22.1 INCHES 1912
20.2 INCHES 2012
19.5 INCHES 1942
18.3 INCHES 1960...1909
18.0 INCHES 1931
17.5 INCHES 1959
17.1 INCHES 1965
16.9 INCHES 1993

TEN LEAST SNOWIEST FEBRUARY`S IN DENVER WEATHER HISTORY SINCE 1872:

TRACE      2009
0.1 INCHES 1992
0.2 INCHES 1970
0.3 INCHES 1954
0.4 INCHES 1925
0.5 INCHES 2005
0.8 INCHES 1991
0.9 INCHES 1983
1.0 INCHES 1943...1908

THERE WERE NO DAYS IN WHICH THUNDER WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT AND FOUR DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. THE PEAK WIND GUST
OF 58 MPH FROM THE WEST-SOUTHWEST OCCURRED ON THE 10TH.

$$



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