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

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CXUS55 KBOU 011315
CLMDEN

DENCLMDEN 000
TTAA00 KBOU 011253

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
614 AM MST SUN FEB 1 2015

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF JANUARY 2015...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2015

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR`S
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH              76   01/27/1888
 LOW              -29   01/09/1875
HIGHEST            75   01/27                         65  01/19
LOWEST            -10   01/04                        -10  01/05
AVG. MAXIMUM     46.7              44.0     2.7     44.9
AVG. MINIMUM     21.0              17.4     3.6     17.3
MEAN             33.9              30.7     3.2     31.1
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      5               5.5    -0.5        4
DAYS MIN <= 32     27              29.4    -2.4       30
DAYS MIN <= 0       3               1.7     1.3        3

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.35   1883
 MINIMUM         0.01   1933
                        1934
                        1952
TOTALS           0.38              0.41   -0.03     0.94
DAILY AVG.       0.01              0.01    0.00     0.03
DAYS >= .01         5               4.1     0.9        9
DAYS >= .10         1               0.9     0.1        3
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.12   01/21
 STORM TOTAL     0.14   01/20(19) TO 01/21(16)

SNOWFALL (INCHES)              JANUARY NORMAL
TOTALS            7.2               7.0

DEGREE_DAYS
HEATING TOTAL     958              1063    -105     1046
 SINCE 7/1       3249              3531    -282     3497
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              9.7
RESULTANT WIND SPEED/DIRECTION   3/229
HIGHEST WIND SPEED/DIRECTION    37/290    DATE  01/17
HIGHEST GUST SPEED/DIRECTION    46/270    DATE  01/05

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             16
NUMBER OF DAYS CLOUDY         10

AVERAGE RH (PERCENT)     62

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          2     HAIL                       0
HEAVY SNOW                1     SNOW                       4
LIGHT SNOW               12     SLEET                      0
FOG                      16     FOG W/VIS <= 1/4 MILE      6
HAZE                      6

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

.....JANUARY 2015 WARMER AND SLIGHTLY DRIER THAN NORMAL.....

JANUARY 2015 STARTED OUT COLD THE FIRST FEW DAYS OF THE MONTH...WITH
SOME SNOW ON THE 1ST AND 3RD. THIS WAS WAS DUE TO AN UPPER LEVEL
TROUGH OF LOW PRESSURE WHICH MOVED ACROSS THE CENTRAL AND SOUTHERN
ROCKIES. LOW TEMPERATURES DROPPED BELOW ZERO ON THE MORNINGS OF THE
3RD...4TH AND 5TH. FROM THE 4TH THROUGH THE 10TH UPPER LEVEL LOW
PRESSURE COVERED THE CENTRAL AND EASTERN STATES...WITH UPPER LEVEL
HIGH PRESSURE DOMINATING THE WESTERN STATES. THIS PATTERN LEFT
COLORADO UNDER THE INFLUENCE OF A NORTHWEST FLOW ALOFT. THIS
RESULTED IN PERIODS OF DOWNSLOPE FLOW EAST OF THE MOUNTAINS...WITH
AN OCCASIONAL COLD FRONT BRINGING COLDER TEMPERATURES AND LIGHT SNOW
TO DENVER DURING THIS PERIOD. ON THE 11TH THE PATTERN
TRANSITIONED...WITH A BROAD UPPER LEVEL TROUGH SETTING UP OVER THE
WESTERN HALF OF THE UNITED STATES. THIS TROUGH BROUGHT BELOW
TEMPERATURES AND FREEZING DRIZZLE AND VERY LIGHT SNOW TO THE DENVER
AREA FROM THE 12TH THROUGH THE 13TH. WARMER AND DRIER WEATHER MOVED
INTO THE FRONT RANGE URBAN CORRIDOR ON THE 15TH AS AN UPPER LEVEL
RIDGE OF HIGH PRESSURE MOVED INTO COLORADO FROM THE WEST. THIS UPPER
RIDGE COMBINED WITH SOME DOWNSLOPE FLOW BROUGHT ABOVE NORMAL
TEMPERATURES TO DENVER FROM THE 15TH THROUGH THE 19TH. ON THE
20TH...AN UPPER LEVEL TROUGH DEVELOPED OVER THE NORTHERN ROCKIES AND
DEEPENED AS IT MOVED ACROSS NORTHEASTERN COLORADO ON THE 21ST. A
COLD FRONT AND MOISTURE ASSOCIATED WITH THIS TROUGH BROUGHT COLDER
TEMPERATURES AND 3.0 INCHES OF SNOW TO DENVER INTERNATIONAL AIRPORT
ON THE 21ST. WARMER TEMPERATURES RETURNED TO THE FRONT RANGE URBAN
CORRIDOR ON THE 23RD DUE TO DOWNSLOPE FLOW. DENVER EXPERIENCED NEAR
RECORD HIGH TEMPERATURES ON THE 26TH AND 27TH AS A LARGE UPPER LEVEL
RIDGE OF HIGH PRESSURE BUILT OVER THE ROCKY MOUNTAIN REGION. A FAST
MOVING STORM SYSTEM LATE IN THE DAY ON THE 31ST BROUGH BANDED
PRECIPITATION TO THE REGION IN THE FORM OF SNOW. THIS LAST DAY STORM
BROUGHT AN ADDITIONAL 0.3 INCH OF SNOW TO JANUARY 2015 AS THE STORM
CROSSED INTO THE FIRST DAY OF FEBRUARY.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH OF JANUARY WAS 46.7 DEGREES F WHICH WAS 2.7 DEGREES ABOVE
NORMAL. JANUARY OF 1986 WAS THE WARMEST JANUARY ON RECORD...WITH AN
AVERAGE TEMPERATURE OF 40.3 DEGREES F.  THE COLDEST JANUARY ON
RECORD WAS 16.8 DEGREES F BACK IN 1930...WHICH IS THE COLDEST MONTH
ON RECORD. THERE WERE 5 DAYS IN WHICH THE TEMPERATURE DID NOT EXCEED
32 DEGREES F...AND 3 DAYS WITH LOW TEMPERATURES AT OR BELOW ZERO
DEGREES F. THE HIGHEST TEMPERATURE OF THE MONTH WAS 75 DEGREES WHICH
OCCURRED ON THE 27TH. THE COLDEST TEMPERATURE OF THE MONTH WAS
10 DEGREES BELOW ZERO ON THE MORNING OF THE 4TH.

DAILY RECORDS:

DATE      TEMPERATURE    TYPE OF RECORD    OLD RECORD   YEAR LAST SET
DEC 30TH    42 DEGF     RECORD HIGH MIN     37 DEGF         2003

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF JANUARY AT DENVER INTERNATIONAL
AIRPORT WAS 0.38 INCHES...WHICH IS 0.03 INCHES BELOW THE NORMAL OF
0.41 INCHES. THERE WERE 5 DAYS WITH MEASURABLE PRECIPITATION. ON THE
21ST...0.12 INCHES OF PRECIPITATION FELL WHICH IS THE GREATEST DAILY
AMOUNT FOR THE MONTH.

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

2.35 INCHES 1883
1.90 INCHES 1877
1.60 INCHES 1891
1.46 INCHES 1949
1.43 INCHES 1948
1.33 INCHES 1962
1.31 INCHES 1973
1.24 INCHES 1959
1.19 INCHES 1992
1.14 INCHES 1989
1.03 INCHES 1974
1.00 INCHES 1965, 1944
0.99 INCHES 1905
0.94 INCHES 2014
0.84 INCHES 1967, 1874
0.83 INCHES 1951
0.78 INCHES 2001, 1940

21 DRIEST JANUARYS IN DENVER WEATHER HISTORY SINCE 1872:

0.01 INCHES 1952, 1934, 1933
0.02 INCHES 1931
0.03 INCHES 2003, 1935, 1914
0.04 INCHES 1904
0.05 INCHES 1998, 1901, 1893
0.07 INCHES 2010, 1961
0.08 INCHES 2008
0.10 INCHES 1970, 1878
0.11 INCHES 1888
0.12 INCHES 1919, 1912, 1911, 1903

SNOW:

7.2 INCHES OF SNOW WAS MEASURED AT DENVER INTERNATIONAL AIRPORT
DURING THE MONTH. THE IS 0.2 INCHES BELOW THE NORMAL OF 7.0 INCHES.
ON THE 21ST...3.0 INCHES OF SNOW WAS MEASURED AT DENVER
INTERNATIONAL AIRPORT...WHICH IS THE GREATEST DAILY SNOWFALL FOR THE
MONTH.

TEN GREATEST MONTHLY JANUARY SNOWFALL AMOUNTS
IN DENVER WEATHER HISTORY SINCE 1872:

24.3 INCHES 1992
22.2 INCHES 1949
20.5 INCHES 1883
19.2 INCHES 1948
17.4 INCHES 1959
17.2 INCHES 1962
17.0 INCHES 1987
15.9 INCHES 2007
15.7 INCHES 1951
14.3 INCHES 2014

TEN LEAST MONTHLY JANUARY SNOWFALL AMOUNTS
IN DENVER WEATHER HISTORY SINCE 1872:

T   INCHES 2003, 1934
0.1 INCHES 1931
0.2 INCHES 1933
0.3 INCHES 1952
0.4 INCHES 1914
0.8 INCHES 1935
0.9 INCHES 1970
1.0 INCHES 1961, 1893

THERE WERE NO DAYS IN WHICH THUNDER OR HAIL WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT. THERE WERE 6 DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. A PEAK WIND OF 46
MPH FROM A WESTERLY DIRECTION WAS RECORDED ON THE 5TH.

$$



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