National Weather Service Weather Forecast Office

These data are preliminary and have not undergone final quality control by the National Climatic Data Center (NCDC). Therefore, these data are subject to revision. Final and certified climate data can be accessed at the NCDC - http://www.ncdc.noaa.gov.

Climatological Report (Monthly)

000
CXUS55 KBOU 011315
CLMDEN

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO
130 AM MST TUE JAN 1 2013


...THE DENVER CO CLIMATE SUMMARY FOR THE YEAR OF 2012...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1872 TO 2012

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
 LOW              -29   01/09/1875
HIGHEST           105R  06/26        64      41       99  08/25
                        06/25                             07/31
                                                          07/04
LOWEST             -6   01/11        36     -42      -17  02/02
AVG. MAXIMUM     68.4              64.7     3.7     64.8
AVG. MINIMUM     39.3              36.3     3.0     36.4
MEAN             53.9              50.5     3.4     50.6
DAYS MAX >= 90     73              39.6    33.4       50
DAYS MAX <= 32     19              20.0    -1.0       23
DAYS MIN <= 32    132             156.9   -24.9      158
DAYS MIN <= 0       4               5.8    -1.8       12

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        23.31   1196
 MINIMUM         7.29   2008
TOTALS          10.11             14.30   -4.19    17.31
DAILY AVG.       0.03              0.04   -0.01     0.05
DAYS >= .01        52              79.7   -27.7       80
DAYS >= .10        23              34.9   -11.9       37
DAYS >= .50         9               7.6     1.4       10
DAYS >= 1.00        1               2.3    -1.3        6
GREATEST
 24 HR. TOTAL    1.63   MM                       05/11 TO 05/12
                                                          10/26 TO 10/26
                                                          10/26 TO 10/26
 STORM TOTAL       MM                               2.52
 (MM/DD(HH))            MM                    05/12(00) TO 05/12(00)
                                                 10/26(00) TO 10/26(00)6
                                                 10/26(00) TO 10/26(00)6

SNOWFALL (INCHES)
RECORDS
 TOTAL             MM   5
 24 HR TOTAL       MM
 SNOW DEPTH        MM   MM
TOTALS           38.5              53.8   -15.3     46.8
 LIQUID EQUIV    3.85              5.40   -1.55     4.68
SINCE 7/1        12.4              22.5   -10.1     29.5
 LIQUID 7/1      1.24              2.20   -0.96     2.95
SNOWDEPTH AVG.      0                MM      MM        0
DAYS >= TRACE      36              33.3     2.7       41
DAYS >= 1.0        13              16.3    -3.3       16
GREATEST
 SNOW DEPTH        11   02/04                          7  01/10
                                                          01/11
 24 HR TOTAL     12.5   MM                       10/26 TO 10/26
                                                          10/26 TO 10/26
                                                          10/26 TO 10/26
 STORM TOTAL       MM                                8.5
 (MM/DD(HH))            MM                    10/26(00) TO 10/26(00)
                                                 10/26(00) TO 10/26(00)6
                                                 10/26(00) TO 10/26(00)6

DEGREE_DAYS
HEATING TOTAL    5198              6059    -861     6069
 SINCE 7/1         MM              2468      MM       MM
COOLING TOTAL    1236                 0    1236      964
 SINCE 1/1       1236               769     467      964

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

WIND (MPH)
AVERAGE WIND SPEED              10.3
RESULTANT WIND SPEED/DIRECTION   3/205
HIGHEST WIND SPEED/DIRECTION    52/240    DATE  06/02
HIGHEST GUST SPEED/DIRECTION    67/250    DATE  06/02

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.50
NUMBER OF DAYS FAIR           86
NUMBER OF DAYS PC            235
NUMBER OF DAYS CLOUDY         45

AVERAGE RH (PERCENT)     44

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM             42     MIXED PRECIP               0
HEAVY RAIN                4     RAIN                      12
LIGHT RAIN               45     FREEZING RAIN              0
LT FREEZING RAIN          1     HAIL                       3
HEAVY SNOW                4     SNOW                      15
LIGHT SNOW               37     SLEET                      0
FOG                      73     FOG W/VIS <= 1/4 MILE     21
HAZE                     51

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

...2012 WAS WARMER AND DRIER THAN NORMAL...

...TEMPERATURES...

TEMPERATURES FOR 2012 FINISHED ABOVE NORMAL WITH A MEAN OF 53.8 DEGREES F, WHICH
IS 3.4 DEGREES ABOVE NORMAL. THERE WERE 73 DAYS WHERE ABOVE 90 DEGREE TEMPERATURES
WERE REACHED AND THAT IS 33 DAYS OVER THE NORMAL. In 2011 WE HAD ONLY 50 DAYS OF
ABOVE 90 DEGREE TEMPERATURES. ON TWO OCCASIONS WE TIED THE RECORD FOR HOTTEST DAY  
WITH 105 DEGREES F ON JUNE 25TH AND 26TH. WE FINISHED THE MONTH OF JUNE WITH A RECORD
SETTING HIGH TEMPERATURE AVERAGE AND JULY WAS THE HOTTEST MONTH IN DENVER HISTORY
WITH AN AVERAGE TEMPERATURE OF 78.9 DEGREES. THERE WERE 132 DAYS THAT DROPPED BELOW
32 DEGREES AND THAT IS 25 DAYS BELOW THE NORMAL.

...PRECIPITATION...

2012 WAS NOT ONLY ONE OF THE HOTTEST YEARS ON RECORD BUT IT WAS ALSO ONE OF THE DRIEST.
DENVER INTERNATIONAL AIRPORT (DIA) ONLY SAW 10.11 INCHES OF PRECIPITATION WHICH IS 4.19 INCHES
BELOW NORMAL. DIA HAD ONLY 52 DAYS WITH PRECIPITATION MEASUREMENTS OF 0.01 INCHES OR ABOVE.
THIS IS 25 DAYS BELOW NORMAL. SNOWFALL AMOUNTS ONLY TOTALED 38.5 INCHES FOR THE YEAR AND
THAT IS 15 INCHES BELOW NORMAL. THE YEAR STARTED OUT WITH A GOOD SNOWFALL AT THE BEGINNING
OF FEB WITH A TOTAL OF 12.5 INCHES FALLING. UNFORTUNATELY, WHEN DENVER TYPICALLY SEES THE
MOST SNOW TURNED OUT TO BE THE DRIEST MARCH ON RECORD WITH ONLY 0.03 INCHES OF PRECIPITATION
FALLING. MARCH WAS ALSO THE SECOND WARMEST MARCH ON RECORD WITH A MEAN TEMPERATURE OF 49.2
DEGREES F. SUMMER PROVED TO BE DRY FOR COLORADO WITH ONLY 1.81 INCHES OF PRECIPITATION
FALLING FOR THE MONTHS OF JUNE, JULY AND AUGUST. THIS IS 4.02 INCHES BELOW NORMAL FOR
THOSE THREE MONTHS. SEPTEMBER WAS AN IMPROVEMENT WITH 2.95 INCHES OF PRECIPITATION WHICH
IS 1.99 INCHES ABOVE NORMAL FOR THAT MONTH WITH THE GREATEST AMOUNT FALLING ON THE 25TH AND
26TH. THE FIRST SNOWFALL OCCURRED ON OCTOBER 24TH WITH A TOTAL OF 4.1 INCHES AT DIA. THE YEAR
ENDED WITH NOVEMBER AND DECEMBER BEING BELOW NORMAL.