Denver's Halloween Weather Statistics     

UPDATED: October 24, 2010
THERE SEEMS TO BE A POPULAR BELIEF IN DENVER THAT IT ALMOST ALWAYS SNOWS ON THE DAY THAT THE GOBLINS AND GHOSTS HEAD THROUGH THE NEIGHBORHOODS SEEKING SWEET DELIGHTS.

LET'S TAKE A QUICK LOOK THROUGH 55 YEARS OF WEATHER STATISTICS (1954-2008) FOR DENVER TO SEE IF IN FACT THAT SNOW ACTUALLY PLAYS A ROLE ON HALLOWEEN.

IF YOU EXAMINE ONLY OCTOBER 31ST...SNOW HAS ONLY FALLEN 10 TIMES (WHICH INCLUDES TRACE AMOUNTS) DURING THE PAST 56 YEARS OF WHICH  8 OF THE DAYS HAD MEASURABLE SNOWFALL.  THIS WORKS OUT TO BE ABOUT ONCE EVERY 7 YEARS OR 18%. HOWEVER...IF YOU INCLUDE THE DAYS THAT HAD SNOW ON THE GROUND ON OCTOBER 31ST BUT NO SNOW ACTUALLY FELL DURING THE TRICK OR TREAT TIMES (5PM -8PM), YOU CAN ADD IN AN ADDITIONAL 10 TIMES.  THEN...TO THIS TOTAL..IF YOU INCLUDE THE NUMBER OF TIMES SNOW FELL ON NOVEMBER 1ST, THIS INCREASES THE TOTAL BY 12, WHICH WILL NOW BRING THE GRAND TOTAL OF SNOW DAYS ASSOCIATED WITH THE PERIOD OCTOBER 31 THROUGH NOVEMBER 1ST TO 32 TIMES. SINCE THIS TOTAL EQUATES TO APPROXIMATELY 57 PERCENT OF THE TIME DURING THE 56 YEAR PERIOD...MORE THAN HALF OF THE TIME...IT IS NO WONDER THAT PEOPLE THINK OF SNOW WHEN HALLOWEEN IS DISCUSSED IN DENVER. AND IF YOU ADD IN THE DAYS WHEN THERE WAS SNOW ON THE GROUND ON OCTOBER 31ST...THE TOTAL DAYS COMES TO 40 WHICH THEN TALLIES UP TO A WHOPPING 71.4 PERCENT!

JUST LAST YEAR...2009...ON HALLOWEEN...THERE WAS NO SNOWFALL RECORDED AND NONE ON THE GROUND. THE HIGH FOR THE LAST DAY OF OCTOBER WAS 55 DEGREES AND THE LOW WAS 32 DEGREES WHICH EQUATES TO AN AVERAGE OF 44 DEGREES. THE AVERAGE TEMPERATURE DURING THE TRICK-OR-TREAT HOURS WAS A TOLERABLE 47 DEGREES.

SNOW WAS DEFINITELY UPON US ON THE OLD WITCHES AND GHOSTS EVENING DURING 2004. DEPENDING ON WHERE YOU WERE...SNOWFALL AMOUNTS AROUND NORTHEAST COLORADO RANGED FROM 0.3 INCHES AT GREELEY UP TO 14.5 INCHES AT ASPEN PARK. THE DENVER INTERNATIONAL AIRPORT REPORTED 1.4 INCHES. AS FORECAST...THE AREA STARTED OFF WITH RAIN AROUND 6PM WHICH THEN QUICKLY CHANGED TO SNOW. BY 8PM...ONLY SNOW WAS FALLING. HERE ARE SOME OF THE SNOWFALL REPORTS FROM AROUND THE DENVER METRO AREA: BAILEY 7.0 INCHES... LARKSPUR 6.5 INCHES...EVERGREEN 5.0 INCHES... AURORA 4.3 INCHES...CHATFIELD RESERVOIR 6.9 INCHES...THORNTON 2.8 INCHES... LAFAYETTE 1.5 INCHES...SEDALIA 10.0 INCHES...JAMESTOWN 6.5 INCHES...BOULDER 2.8 INCHES...MORRISON 5.5 INCHES... ENGLEWOOD 5.0 INCHES...DENVER 3.7 INCHES...CASTLE ROCK 6.8 INCHES AND .CENTENNIAL RECORDED 8.0 INCHES.

DURING HALLOWEEN 2002...MOTHER NATURE TURNED ON THE WINTER MACHINE AND THE TRICK-OR-TREATERS MARCHED THROUGH SOME SNOW AS THEY COLLECTED THEIR SWEET GOODIES. AT STAPLETON AIRPORT...1.2 INCHES OF SNOW WAS RECORDED ON HALLOWEEN WITH AN AVERAGE SNOW DEPTH OF 2 INCHES. AS OF 2002...THIS WAS ONLY THE 7TH OCCURRENCE OF SNOW IN DENVER ON OCTOBER 31ST SINCE 1954. TEMPERATURES FOR THE KIDOS DURING TRICK-OR-TREAT TIME WAS IN THE MID TO UPPER TEENS. SNOWFALL WAS ALSO RECORDED ON THE DAY BEFORE HALLOWEEN...2.2 INCHES AND AGAIN ON NOVEMBER 1ST...0.6 INCH.

PREVIOUS TO 2002...THE LAST MEASURABLE SNOW OCCURRED IN 1989. THERE WAS A MIXTURE OF RAIN AND SNOW EARLY IN THE DAY BEFORE CHANGING TO ALL SNOW LATE IN THE DAY. A TOTAL OF 3.4 INCHES OF SNOW FELL WITH ANOTHER 1.1 INCHES ON NOVEMBER 1ST. IN 1992...NEARLY HALF OF AN INCH OF LIQUID PRECIPITATION... 0.42 INCH...FELL BUT NO SNOW WAS RECORDED BECAUSE DURING THE TIME PERIOD OF THE RAIN... TEMPERATURES WERE JUST ABOVE THE SNOW TEMPERATURE THRESHOLD.

MOTHER NATURE PLAYED A REAL TRICK ON THE DENVER TREATERS FOR HALLOWEEN IN 1972. THE HIGH ON THAT PARTICULAR JACK-O-LANTERN DAY WAS ONLY 30 DEGREES AND THE LOW BOTTOMED OUT AT A VERY COLD 15 DEGREES. EIGHT INCHES OF SNOW WAS RECORDED ON OCTOBER 31ST AND TO TOP THAT OFF... AN ADDITIONAL 5.8 INCHES OF SNOW FELL ON NOVEMBER 1ST.

DURING HALLOWEEN...2003...DRIZZLE...LIGHT RAIN AND FREEZING DRIZZLE ACCOMPANIED THE GHOSTS AND GOBLINS. SOME VERY LIGHT SNOW DID OCCUR ACROSS PARTS OF THE METRO AREA BUT NOT AT STAPLETON INTERNATIONAL OR DENVER INTERNATIONAL. AVERAGE TEMPERATURE DURING TRICK OR TREAT TIME WAS 27.5 DEGREES.

DURING THE PAST 56 YEARS...THE AVERAGE TEMPERATURE DURING THE TIME MOST KIDS ARE OUT (5PM-8PM) IS
42.2 DEGREES. THE COLDEST TRICK-OR-TREAT  PERIOD WAS  IN 2002...WITH AN AVERAGE TEMPERATURE OF ONLY 18 DEGREES. THE WARMEST TRICK-OR-TREAT TIME WAS IN 1990 WITH AN AVERAGE TEMPERATURE OF 63 DEGREES. THE AVERAGE HIGH TEMPERATURE FOR THE LAST DAY OF OCTOBER IS 55.2 DEGREES WHILE THE AVERAGE LOW TEMPERATURE IS 29.4 DEGREES. NOTE: THE TEMPERATURE NORMALLY DROPS ABOUT 8 DEGREES FROM SUNSET UNTIL THE TIME THAT THE KIDOS ARE COLLECTING THEIR TREATS.

IN 1999...HALLOWEEN DAY TURNED OUT TO BE THE WARMEST OCTOBER 31ST SINCE WE STARTED KEEPING THESE HALLOWEEN STATISTICS IN 1954. BUT DURING THE 5PM TO 8PM TIME FRAME...1990 ACTUALLY HAD A WARMER AVERAGE TEMPERATURE WITH A 63 DEGREE AVERAGE COMPARED TO 59 DEGREE AVERAGE TRICK OR TREAT TEMPERATURE IN 1999. THAT WAS 23 DEGREES WARMER THAN THE AVERAGE TEMPERATURE JUST ONE YEAR PRIOR IN 1998 WHEN THE MERCURY AVERAGED ONLY A VERY CHILLY 36 DEGREES.

****WILL IT SNOW FOR HALLOWEEN 2010?*****

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TO GET THE LATEST NATIONAL WEATHER SERVICE DENVER FORECAST FOR THIS YEAR'S HALLOWEEN, PLEASE GO TO THE FOLLOWING LINK:

Seven Day Forecast for Denver and Surrounding Suburbs
(Actual Halloween forecast will not be available until 7 days prior to the Ghost and Goblin Day!)

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TO GET THE LATEST NATIONAL WEATHER SERVICE FORECAST FOR YOUR LOCATION FOR THIS YEAR'S HALLOWEEN, PLEASE GO TO THE FOLLOWING LINK:

Click on the map where your location is and get the 7 day forecast
(Actual Halloween forecast will not be available until 7 days prior to the Ghost and Goblin Day!)

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"Denver's Halloween Weather Statistics"
(1954-2009)

Halloween Summary and Averages (To include Max and Min Values)

Number of
Years = 56

 

High 

Low 

Precip 

Snowfall 

Snow Depth 

Snowfall 

Avg
Temp


 10/31&11/01 
        10/31 10/31
At 5PM
11/01
5PM-8PM
Snow
Totals

Max Value
 
78 

47 

0.53 

8.0 

4.0 

5.8 

63 

 
Min Value   19  10  0.00  0.0  0.0  18   
                   
Total Days
Measurable
     
16 

8 

6 

12 
 
20
                   
Total Days
Trace Only
     
 5 



 
10
                   
Average or Total   55.6  30.1  21  10 10  20  42.5   30 
                   
Percent       37.5% 17.9% 17.9% 35.7%   53.6%

Denver's Year By Year Halloween
Temperature, Precipitation and Snowfall Statistics
(1954-2009)

Year
High
Low
Precip Snowfall
Snow Depth
Avg Temp
Snowfall
   
  Oct 31st
At 5PM
5PM-8PM
Nov 1st
   
         
 2009 55 
32
0 0 47 0
2008 
7
38
0 0 55 0
2007 
48 
32
0.01 0 39 0
2006 
38 
23
0 0 30 0
2005 
55 
31
0 0 45 0
2004 
55 
24
0.27 1.4 39 1.8
2003 
30 
23 
0.07  0.0  28  0.0 
2002 
19 
15 
0.03  1.2  18  0.6 
2001 
71 
37 
54 
2000 
46 
33 
0.07  43 
1999 
77 
31 
59 
1998 
38 
34 
0.06  36  T
1997 
59 
38 
T 41 
1996 
32 
28 
T T 30  0.1 
1995 
45 
27 
35  0.9 
1994 
59 
27 
53 
1993 
65 
27 
46  0.5 
1992 
53 
35 
0.42  40 
1991 
32 
10 
24  2.3 
1990 
72 
37 
63 
1989
59 
24 
0.24  3.4  36  1.1 
1988 
73 
34 
58 
1987 
62 
47 
54 
1986 
44 
33 
0.51  1.2  37  2.8 
1985 
59 
36 
0.38  39 
1984 
67 
24 
50 
1983 
71 
41 
T 58 
1982 
53 
34 
0.04  46 
1981 
53 
36 
46 
1980 
76 
36 
58 
1979 
40 
23 
T 32  T
1978 
59 
32 
46 
1977 
56 
28 
0.39  3.3  34 
1976 
61 
31 
T 48  T
1975 
55 
37 
T 48 
1974 
56 
28 
45 
1973 
62 
38 
39  0.8 
1972 
30 
15 
0.53  8.0  28  5.8 
1971 
53 
21 
40  T
1970 
54 
24 
T 34  T
1969 
45 
24 
T 36  2.7 
1968 
63 
37 
0.23  44 
1967 
63 
33 
50 
1966 
48 
26 
0.16  1.4  32 
1965 
66 
29 
47 
1964 
66 
35 
46 
1963 
45 
27 
0.16  1.1  36 
1962 
71 
31 
41 
1961 
56 
29 
48  T
1960 
61 
34 
53 
1959 
48 
21 
36  T
1958 
52 
28 
37 
1957 
70 
39 
54 
1956 
65 
32 
56  4.7 
1955 
65 
35 
T T 38  T
1954 
58 
24 
26 


Have a safe and fun Halloween!

Benton


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