79°F
Thornton, Colorado, USA
UpdatedMon, 01-Sep-2014 2:55pm MDT 
 

Navigation

ThorntonWeather.com on Twitter

ThorntonWeather.com on Facebook

 

Weather Geek Stuff - weathergeekstuff.com

Rocky Mountain Weather Network

Denver Weather Examiner
Climate Change Examiner
Natural Disasters Examiner



December 2009 goes into the books as seventh coldest on record

Monday, January 4th, 2010 6:25am MDT

For the second time in the past three months, Denver has experienced monthly average temperatures in the ‘top 10 coldest’ category. In October, the Mile High City saw its second coldest October on record since record keeping began in 1882. Now Denver has just wrapped up its seventh coldest December in history.

Denver’s average December 2009 temperature was 24.1 degrees – a chilly 6.2 degrees below the normal average of 30.3 degrees. That puts the month into the books as the seventh coldest December on record (image right).  Thornton was just a touch colder having recorded an average temperature of 23.8 degrees.

Temperatures during the month ranged from a high temperature of 59 degrees on the 1st down to a low of -17 on the 9th. Overall, the majority of days during the month saw below normal temperatures.

In terms of snowfall, the month did finish above average but not in record setting territory. The National Weather Service recorded 11.1 inches of snowfall at the official monitoring station at Denver International Airport. This was 2.4 inches above the average of 8.7 inches for December.  In Thornton, we received a bit more snow than DIA.  15.3 inches was recorded at ThorntonWeather.com of which the single biggest even was the pre-Christmas storm which dumped 7.5 inches.

 The snow we did receive however was rather dry and as such we finished the month below normal for precipitation. DIA recorded 0.45 inch of precipitation which is 0.18 inch below normal.  Here again, because of the additional snowfall, Thornton fared a bit better with 0.5 inch of precipitation. 

CLIMATE REPORT
NATIONAL WEATHER SERVICE BOULDER, CO                                 
510 PM MST SAT JAN 2 2010

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

...THE DENVER CO CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2009...

CLIMATE NORMAL PERIOD 1971 TO 2000
CLIMATE RECORD PERIOD 1872 TO 2009

WEATHER         OBSERVED          NORMAL  DEPART  LAST YEAR'S         
                 VALUE   DATE(S)  VALUE   FROM    VALUE  DATE(S)      
                                          NORMAL                      
................................................................
TEMPERATURE (F)
RECORD
 HIGH              79   12/05/1939                                    
 LOW              -25   12/22/1990                                    
                        12/24/1876                                    
HIGHEST            59   12/21        79     -20       69  12/02       
                        12/01                                         
LOWEST            -17   12/09       -25       8      -19  12/15       
AVG. MAXIMUM     36.4              44.1    -7.7     41.0              
AVG. MINIMUM     11.9              16.4    -4.5     12.3              
MEAN             24.1              30.3    -6.2     26.6              
DAYS MAX >= 90      0               0.0     0.0        0              
DAYS MAX <= 32     15               5.3     9.7       10              
DAYS MIN <= 32     31              29.2     1.8       30              
DAYS MIN <= 0       6               2.8     3.2        6              

PRECIPITATION (INCHES)
RECORD
 MAXIMUM         5.21   1913                                          
 MINIMUM         0.00   1881                                          
TOTALS           0.45              0.63   -0.18     0.24              
DAILY AVG.       0.01              0.02   -0.01     0.01              
DAYS >= .01         7               5.3     1.7        6              
DAYS >= .10         2                MM      MM        0              
DAYS >= .50         0                MM      MM        0              
DAYS >= 1.00        0                MM      MM        0              
GREATEST
 24 HR. TOTAL    0.20   12/22 TO 12/23        0.10  12/13 TO 12/14       

SNOWFALL (INCHES)
RECORDS
 TOTAL           57.4   1913  SNOWIEST DENVER MONTH SINCE 1881
TOTALS           11.1                8.7              7.1             

DEGREE_DAYS
HEATING TOTAL    1260              1078     182     1179              
 SINCE 7/1       2739              2486     253     2367              
COOLING TOTAL       0                 0       0        0              
 SINCE 1/1        533               696    -163      825              

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

WIND (MPH)
AVERAGE WIND SPEED              8.8
RESULTANT WIND SPEED/DIRECTION   3/217
HIGHEST WIND SPEED/DIRECTION    43/220    DATE  12/13
HIGHEST GUST SPEED/DIRECTION    49/220    DATE  12/13

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM *SUNSHINE DATA N/A EFFECTIVE 10/1

NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             21
NUMBER OF DAYS CLOUDY          6

AVERAGE RH (PERCENT)     61

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                0     SNOW                       2
LIGHT SNOW               10     SLEET                      0
FOG                      11     FOG W/VIS <= 1/4 MILE      1
HAZE                      7                                           
                                                                    
-  INDICATES NEGATIVE NUMBERS.                                      
R  INDICATES RECORD WAS SET OR TIED.                                
MM INDICATES DATA IS MISSING.                                       
T  INDICATES TRACE AMOUNT.   

Tags: , ,

Leave a Comment

*