STATION:  ASPEN-PITKIN COUNTY ARPT (KASE), CO

CLIMATOLOGICAL SUMMARY.  Period of Record: May 1998 to Dec 2008

Summaries based on unedited daily ASOS data.  Errors may be present.

-----------------------------------------------------------------------------------------------

TEMPERATURE (F)     |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Avg Max Temp        |  32.9  35.7  44.3  54.5  64.4  74.7  82.0  77.6  70.0  58.4  43.8  32.4 |   55.9
Avg Min Temp        |   8.5  10.8  19.8  27.7  34.2  40.7  48.1  46.5  38.3  28.9  17.8   8.3 |   27.5
Avg Temperature     |  20.7  23.2  32.0  41.1  49.3  57.7  65.1  62.1  54.2  43.6  30.8  20.3 |   41.7
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    62    54    67    72    86    89    92    91    86    76    67    64 |     92
                    |                                                                         |
    Date of Ext-Day |    02    01    20    22    31    26    21    14    04    21    07    31 |
               -Year|  2006  2003  2004  2006  2002  2002  2005  2003  1998  2003  1999  2005 |
                    |                                                                         |
    Extreme Min Temp|   -18   -12   -16     1    17    25    37    32    17    10   -15   -21 |    -21
                    |                                                                         |
    Date of Ext-Day |    15    13    03    01    06    05    04    28    29    17    30    08 |
               -Year|  2007  2004  2002  2008  1999  1999  2005  2004  1999  1999  2006  2005 |
                    |                                                                         |
Heating Degree Days |  1373  1180  1022   717   486   224    42   103   327   662  1026  1384 |   8546
Cooling Degree Days |     0     0     0     0     0     5    45    12     1     0     0     0 |     63
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.0   0.0   2.0   0.2   0.0   0.0   0.0   0.0 |    2.2
    Max Temp >= 75  |   0.0   0.0   0.0   0.0   4.1  17.8  27.9  23.4   9.4   0.2   0.0   0.0 |   82.7
    Max Temp <= 32  |  14.2   9.3   4.0   0.6   0.1   0.0   0.0   0.0   0.0   0.2   5.8  15.6 |   49.8
                    |                                                                         |
    Min Temp <= 32  |  30.9  28.2  30.0  24.6  11.9   2.4   0.0   0.1   4.6  22.6  29.4  30.9 |  215.5
    Min Temp <= 20  |  27.3  23.7  14.4   3.1   0.7   0.0   0.0   0.0   0.2   3.3  15.9  27.9 |  116.5
    Min Temp  <= 0  |   7.0   4.0   1.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.6   5.9 |   19.7
                    |                                                                         |
Avg Dew Point Temp  |  11.6  13.0  17.7  21.0  27.4  31.6  41.2  41.7  32.8  24.6  17.4  11.8 |   24.3
Avg Wet Bulb Temp   |  17.6  20.0  26.5  32.8  39.4  44.9  51.7  50.6  43.2  34.7  24.9  17.5 |   33.6
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
Avg Sea Level Pres  | 30.17 30.12 30.07 30.01 29.97 29.91 29.96 29.99 29.98 30.04 30.14 30.17 |  30.04
(Inches of Mercury) |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
WEATHER             |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
See disclaimer below|                                                                         |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Thunderstorms   |   0.0   0.0   0.0   0.6   2.1   3.6   8.0   6.5   3.5   0.5   0.3   0.1 |   25.1
    Heavy Fog       |   2.3   3.1   2.9   2.1   1.4   0.4   0.0   0.1   0.1   0.9   2.5   1.7 |   17.5
    Fog             |  13.3  12.8  12.1   9.9   5.4   2.6   4.1   4.5   6.0   6.5  10.1  10.8 |   98.1
    Hail            |   0.0   0.0   0.0   0.1   0.0   0.2   0.0   0.0   0.0   0.0   0.0   0.0 |    0.3
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.08  0.97  1.16  1.48  1.27  0.91  1.76  1.39  1.77  1.37  1.22  0.93 |  15.31
                    |                                                                         |
Maximum Daily       |  0.52  0.43  0.55  0.79  1.16  0.82  0.86  0.51  0.85  0.85  0.80  0.72 |   1.16
                    |                                                                         |
    Date of Ext-Day |    06    10    14    09    03    14    23    06    18    19    28    01 |
               -Year|  2008  2000  2008  2004  2001  1998  2008  2001  2002  2005  2006  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  10.9  11.4  11.4  11.0   9.4   6.7  12.4  12.7   9.5   9.3   9.5  11.5 |  125.6
    >= 0.10         |   3.9   3.4   4.4   5.2   4.0   2.7   6.1   5.2   5.0   4.5   4.5   3.1 |   52.0
    >= 0.25         |   1.0   0.8   1.2   1.8   1.4   1.3   2.5   1.6   2.7   1.8   1.3   0.8 |   18.3
    >= 0.50         |   0.1   0.0   0.2   0.4   0.6   0.4   0.5   0.1   0.8   0.5   0.4   0.2 |    4.2
    >= 1.00         |   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.8   5.3   6.0   7.0   7.1   7.2   6.6   6.3   6.5   5.9   4.9   4.7 |    6.0
Daily Avg Max 2-Min |  13.1  14.7  16.8  20.4  20.4  20.4  20.1  19.3  18.6  16.8  13.6  12.8 |   17.2
Daily Avg Peak Gust |  16.4  18.5  21.7  27.0  27.3  27.5  26.2  25.2  24.7  21.8  17.5  16.0 |   22.5
                    |                                                                         |
Maximum Daily Avg   |  11.7  12.7  13.2  15.3  15.0  11.4  10.8  10.9  11.9  12.9  13.1  10.7 |   15.3
                    |                                                                         |
Maximum 2-Minute Avg|    28    36    35    44    44    41    36    35    37    32    37    30 |     44
                    |                                                                         |
Date of Max 2min-Day|    15    25    14    28    21    06    14    01    12    11    11    15 |
               -Year|  2003  2002  2001  1999  2002  2006  2005  2004  2004  2000  2005  2000 |
                    |                                                                         |
Maximum Peak Gust   |    43    47    44    52    62    51    45    44    53    47    45    45 |     62
                    |                                                                         |
Date of Max Gust-Day|    28    25    21    28    21    14    23    01    22    30    11    30 |
               -Year|  2008  2002  1999  1999  2002  2006  2005  2004  2007  2003  2005  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.1   2.6   4.7  10.6  10.1  10.2   8.8   7.8   6.4   4.8   2.7   1.6 |   72.3
   Peak Gust >=40   |   0.2   0.4   0.3   2.0   1.5   1.6   1.2   0.3   0.7   0.6   0.2   0.2 |    9.2
   Peak Gust >=50   |   0.0   0.0   0.0   0.2   0.3   0.1   0.0   0.0   0.1   0.0   0.0   0.0 |    0.7
                    |                                                                         |
   Max 2-Minute >=30|   0.0   0.4   0.6   2.5   1.4   1.9   1.6   0.5   1.0   0.7   0.2   0.0 |   10.7
   Max 2-Minute >=40|   0.0   0.0   0.0   0.1   0.1   0.2   0.0   0.0   0.0   0.0   0.0   0.0 |    0.4
                    |                                                                         |
------------------------------------------------------------------------------------------------------

Observations of WEATHER may me innacurate due to early ASOS inconsistancies.  Average days
with Thunderstorms may be low due to early mis-detection.

Heavy Fog = Visibility less than or equal to 1/4 mile.
Fog = Visibility greater than 1/4 mile or less than 7 miles.
Peak Gust = Maximum 5-second average.
Snowfall data not observed at ASOS stations.

Copyright ©2009 Western Regional Climate Center - Desert Research Institute - Reno, Nevada.