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

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CLIMATE REPORT
NATIONAL WEATHER SERVICE DENVER/BOULDER CO
144 AM MST WED FEB 1 2017

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF JANUARY 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              76   01/27/1888
 LOW              -29   01/09/1875
HIGHEST            63   01/30        76     -13       65  01/30
LOWEST             -7   01/06       -29      22        5  01/10
AVG. MAXIMUM     42.3              44.0    -1.7     43.5
AVG. MINIMUM     17.7              17.4     0.3     20.1
MEAN             30.0              30.7    -0.7     31.8
DAYS MAX >= 90      0               0.0     0.0        0
DAYS MAX <= 32      8               5.5     2.5        3
DAYS MIN <= 32     30              29.4     0.6       30
DAYS MIN <= 0       2               1.7     0.3        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         2.35   1883
 MINIMUM         0.01   1933
                        1934
                        1952
TOTALS           0.54              0.41    0.13     0.50
DAILY AVG.       0.02              0.01    0.01     0.02
DAYS >= .01         3               4.1    -1.1        5
DAYS >= .10         3               0.9     2.1        3
DAYS >= .50         0               0.0     0.0        0
DAYS >= 1.00        0               0.0     0.0        0
GREATEST
 24 HR. TOTAL    0.34   01/04 TO 01/05           01/07 TO 01/08
                                                          01/08 TO 01/08
                                                          01/08 TO 01/08
 STORM TOTAL       MM                                 MM
 (MM/DD(HH))            MM                    01/08(00) TO 01/08(00)
                                                 01/08(00) TO 01/08(00)8
                                                 01/08(00) TO 01/08(00)8

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   MM
TOTALS            6.3               7.0

DEGREE_DAYS
HEATING TOTAL    1075              1063      12     1021
 SINCE 7/1       3117              3531    -414     3208
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              9.0
RESULTANT WIND SPEED/DIRECTION   3/223
HIGHEST WIND SPEED/DIRECTION    37/280    DATE  01/10
HIGHEST GUST SPEED/DIRECTION    53/270    DATE  01/09

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.60
NUMBER OF DAYS FAIR            5
NUMBER OF DAYS PC             20
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     59

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                0     RAIN                       0
LIGHT RAIN                0     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       2
LIGHT SNOW                9     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      2
HAZE                      7

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

......JANUARY 2017...COLDER AND SLIGHTLY WETTER THAN NORMAL........

THE MONTH BEGAN DRY WITH NEAR NORMAL TEMPERATURES ACROSS THE
FRONT RANGE OF COLORADO. AN ARCTIC AIRMASS ASSOCIATED WITH A DEEP
UPPER LEVEL TROUGH OF LOW PRESSURE TRACKING ACROSS THE NORTHERN
ROCKIES AND NORTHERN PLAINS STATES PLUNGED INTO COLORADO ON THE 3RD.
THIS MOIST AND VERY COLD AIRMASS COMBINED WITH LIFT FROM AN UPPER
LEVEL JET STREAM BROUGHT HEAVY SNOW AND VERY COLD TEMPERATURES TO
THE FOOTHILLS AND ADJACENT PLAINS FROM THE 4TH THROUGH THE 5TH. 3 TO
12 INCHES OF SNOW FELL ACROSS THE FRONT RANGE URBAN CORRIDOR WITH UP
TO 2 FEET OVER PORTIONS OF THE FRONT RANGE FOOTHILLS. DENVER
INTERNATIONAL AIRPORT MEASURED 4.1 INCHES WITH THE SYSTEM. HIGH
TEMPERATURES MANAGED TO RISE ONLY INTO THE SINGLE DIGITS ON THE
5TH...WITH MORNING LOW TEMPERATURES DROPPING BELOW ZERO THE 5TH AND
6TH. TEMPERATURES RETURNED TO ABOVE NORMAL VALUES BY THE 9TH AS AN
UPPER LEVEL RIDGE OF HIGH PRESSURE BUILT OVER THE ROCKY MOUNTAIN
REGION. COLDER TEMPERATURES RETURNED TO NORTHEASTERN COLORADO ON THE
12TH DUE TO A COLD FRONTAL PASSAGE. ON THE 16TH AN UPPER LEVEL
STORM SYSTEM TRACKING ACROSS SOUTHERN COLORADO BROUGHT 2 TO 7 INCHES
OF SNOW TO THE DENVER METRO AREA...WITH 2.2 INCHES MEASURED AT
DENVER INTERNATIONAL AIRPORT. THE FINAL TWO WEEKS OF JANUARY WERE
DRY WITH ONLY A TRACE OF PRECIPITATION ON THE 20TH...24TH AND
25TH. THE MONTH ENDED ON A WARM NOTE WITH HIGH TEMPERATURES IN THE
60S THE LAST THREE DAYS OF THE MONTH AS UPPER LEVEL HIGH PRESSURE
RE-BUILT OVER THE ROCKY MOUNTAIN REGION.

TEMPERATURES:

THE AVERAGE TEMPERATURE AT DENVER INTERNATIONAL AIRPORT FOR THE
MONTH WAS 30.0 DEGREES F, WHICH WAS 0.7 DEGREES BELOW NORMAL. THE
WARMEST JANUARY ON RECORD OCCURRED IN 1986 WITH AN AVERAGE
MONTHLY TEMPERATURE OF 40.3 DEGREES F. THE COLDEST JANUARY ON RECORD
WAS 16.8 DEGREES F IN 1930. THIS WAS ALSO THE COLDEST MONTH IN
DENVER WEATHER HISTORY. ON THE 30TH THE TEMPERATURE CLIMBED TO 60
DEGREES F WHICH IS THE HIGHEST TEMPERATURE OF THE MONTH. THE COLDEST
TEMPERATURE OF -7 DEGREES F OCCURRED ON THE MORNING OF THE 6TH. IN
ADDITION...THE MAX TEMPERATURE ON THE 5TH ONLY MANAGED TO REACH 5
DEGREES F WHICH ALMOST SET A NEW RECORD LOW MAX TEMPERATURE FOR THE
DAY. THE RECORD LOW MAX FOR THE DATE IS 4 DEGREES BACK IN 1974.
DURING THE MONTH THERE WERE SIX DAYS IN WHICH THE MAX TEMPERATURE
DID NOT REACH 32 DEGREES F AND TWO DAYS IN WHICH THE TEMPERATURE
DROPPED BELOW ZERO.

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

40.3 1986
40.1 1934
39.6 1953
39.4 1935
38.3 1893
38.2 1911
37.9 1923
37.4 2006
37.3 1981...1896


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

16.8 1930*
18.0 1979
18.1 1875
18.2 1937
19.1 1963
19.4 1949
19.5 1962
20.8 2007
21.7 1886
22.8 1916
* COLDEST MONTH IN DENVER WEATHER HISTORY

PRECIPITATION:

PRECIPITATION FOR THE MONTH OF JANUARY AT DENVER INTERNATIONAL
AIRPORT WAS 0.54 INCHES...WHICH IS 0.13 INCHES ABOVE THE NORMAL OF
0.41 INCHES. THERE WERE 3 DAYS WITH MEASURABLE PRECIPITATION DURING
THE MONTH. 0.24 INCHES OF PRECIPITATION FELL ON THE 5TH...WHICH IS
THE GREATEST DAILY AMOUNT FOR THE MONTH. 6.3 INCHES OF SNOW WAS
MEASURED DURING THE MONTH...WITH 4.1 OF THAT FALLING FROM THE 4TH
THROUGH THE 5TH. THIS IS 0.7 INCHES BELOW THE NORMAL OF 7.0 INCHES.

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

ELEVEN DRIEST JANUARY`S 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

TEN SNOWIEST JANUARY`S 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...1891
15.9 INCHES 2007
15.7 INCHES 1951

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

TRACE      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 WAS OBSERVED AT DENVER
INTERNATIONAL AIRPORT....AND TWO DAYS WITH DENSE FOG WITH A
VISIBILITY AT OR BELOW 1/4 MILE DURING THE MONTH. THE PEAK WIND GUST
OF 53 MPH FROM THE WEST OCCURRED ON THE 9TH.

$$



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