STATION:  GRAND JUNCTION-WALKER FIELD AIRPORT (KGJT), CO

CLIMATOLOGICAL SUMMARY.  Period of Record: Jul 1996 to Dec 2008

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

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TEMPERATURE (F)     |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Avg Max Temp        |  39.6  45.7  57.4  65.6  77.8  88.6  95.1  90.2  80.0  66.6  51.2  38.7 |   66.4
Avg Min Temp        |  19.7  24.3  30.9  38.3  47.3  56.3  64.5  61.7  52.0  40.1  28.0  18.8 |   40.2
Avg Temperature     |  29.6  35.0  44.2  51.9  62.5  72.5  79.8  76.0  66.0  53.3  39.6  28.8 |   53.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    57    65    81    86   101   103   106   103    95    88    76    61 |    106
                    |                                                                         |
    Date of Ext-Day |    17    28    20    27    29    30    21    02    04    01    02    01 |
               -Year|  2000  2006  2004  2000  2000  2002  2005  2000  1998  2003  2008  1999 |
                    |                                                                         |
    Extreme Min Temp|    -8     3     6    16    26    37    51    48    31    20    -4   -12 |    -12
                    |                                                                         |
    Date of Ext-Day |    15    12    02    12    09    14    02    27    27    22    30    22 |
               -Year|  2007  2004  2002  1997  2002  2001  1997  2006  1996  1996  2004  1998 |
                    |                                                                         |
Heating Degree Days |  1096   849   645   394   146    23     0     0    71   367   763  1124 |   5476
Cooling Degree Days |     0     0     0     1    69   246   458   340   100     6     0     0 |   1220
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   2.8  16.7  26.6  18.9   3.1   0.0   0.0   0.0 |   68.1
    Max Temp >= 75  |   0.0   0.0   0.8   6.8  20.1  27.7  31.0  30.7  23.2   6.6   0.1   0.0 |  146.9
    Max Temp <= 32  |   6.1   1.5   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.8   7.1 |   15.6
                    |                                                                         |
    Min Temp <= 32  |  29.8  24.3  19.0   6.5   0.8   0.0   0.0   0.0   0.2   4.8  22.7  30.5 |  138.5
    Min Temp <= 20  |  16.6   8.2   2.1   0.3   0.0   0.0   0.0   0.0   0.0   0.1   4.2  17.6 |   49.1
    Min Temp  <= 0  |   0.7   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.9 |    1.7
                    |                                                                         |
Avg Dew Point Temp  |  20.3  21.4  23.2  25.7  30.0  32.4  43.1  45.2  38.7  30.8  24.3  18.9 |   29.5
Avg Wet Bulb Temp   |  26.0  29.6  35.4  40.6  47.2  52.3  59.0  58.5  51.6  42.7  33.1  25.1 |   41.7
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.20 30.12 30.03 29.97 29.93 29.88 29.86 29.90 29.94 30.02 30.14 30.21 |  30.02
(Inches of Mercury) |                                                                         |
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                    |                                                                         |
WEATHER             |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
See disclaimer below|                                                                         |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Thunderstorms   |   0.1   0.2   0.8   1.0   2.7   3.8   6.3   7.6   5.0   1.9   0.2   0.1 |   29.8
    Heavy Fog       |   2.2   1.1   0.8   0.2   0.1   0.0   0.0   0.0   0.2   0.3   1.4   1.7 |    7.8
    Fog             |   9.2   6.9   5.2   4.2   1.9   1.4   1.2   2.0   3.9   4.7   5.1   7.3 |   53.0
    Hail            |   0.0   0.2   0.2   0.2   0.1   0.2   0.1   0.2   0.2   0.2   0.1   0.0 |    1.5
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.58  0.52  0.67  0.96  0.61  0.41  0.51  1.04  1.44  1.04  0.70  0.50 |   8.97
                    |                                                                         |
Maximum Daily       |  0.49  0.30  0.49  0.75  0.83  0.50  0.63  1.31  1.09  0.78  0.72  0.60 |   1.31
                    |                                                                         |
    Date of Ext-Day |    26    17    20    04    25    12    14    05    23    06    27    07 |
               -Year|  2000  2000  2000  1997  1997  2007  2001  1997  2007  2006  2008  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   5.9   6.8   5.9   7.2   4.6   3.2   4.2   6.2   7.3   6.8   5.4   5.0 |   68.4
    >= 0.10         |   2.1   2.2   2.5   2.8   2.2   1.8   1.6   2.8   4.9   3.6   2.4   1.4 |   30.1
    >= 0.25         |   0.5   0.3   0.6   1.8   0.5   0.6   0.8   1.5   1.9   1.5   1.0   0.7 |   11.6
    >= 0.50         |   0.0   0.0   0.0   0.2   0.2   0.1   0.2   0.4   0.5   0.2   0.1   0.1 |    2.0
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   0.1   0.0   0.0   0.0 |    0.2
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.1   6.3   7.5   9.0   8.9   9.3   9.1   8.6   8.2   7.4   5.6   5.1 |    7.5
Daily Avg Max 2-Min |  14.8  17.6  20.2  23.3  23.2  23.8  23.5  22.1  20.2  19.3  15.8  14.8 |   19.9
Daily Avg Peak Gust |  16.8  20.5  23.9  28.6  28.5  29.4  28.4  26.5  24.0  22.7  18.4  17.0 |   23.7
                    |                                                                         |
Maximum Daily Avg   |  15.0  17.5  18.1  23.4  21.9  21.2  16.2  16.3  19.9  18.3  16.9  14.1 |   23.4
                    |                                                                         |
Maximum 2-Minute Avg|    40    41    53    49    46    48    45    45    44    51    45    44 |     53
                    |                                                                         |
Date of Max 2min-Day|    11    24    14    18    21    17    14    08    29    25    14    01 |
               -Year|  2005  1998  2001  2000  2008  1999  2002  1999  2007  2006  2005  2007 |
                    |                                                                         |
Maximum Peak Gust   |    49    55    60    63    68    55    68    64    55    62    55    54 |     68
                    |                                                                         |
Date of Max Gust-Day|    11    24    14    18    28    17    14    11    22    25    14    01 |
               -Year|  2005  1998  2001  2007  2004  1999  2002  1999  1996  2006  2005  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.3   3.4   7.0  12.2  12.3  13.8  12.3   9.5   7.0   6.2   2.3   1.5 |   88.6
   Peak Gust >=40   |   0.4   0.8   1.8   3.4   3.6   3.7   4.1   2.3   1.8   2.2   0.6   0.4 |   25.0
   Peak Gust >=50   |   0.0   0.1   0.2   0.8   0.6   0.7   0.3   0.4   0.2   0.4   0.2   0.1 |    3.9
                    |                                                                         |
   Max 2-Minute >=30|   0.4   1.4   3.8   5.3   5.8   5.6   6.6   4.5   3.4   3.4   0.9   0.0 |   41.2
   Max 2-Minute >=40|   0.1   0.2   0.4   0.7   0.6   0.5   0.4   0.3   0.2   0.8   0.2   0.0 |    4.3
                    |                                                                         |
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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.