STATION:  GILLETTE-CAMPBELL CO. ARPT (KGCC), WY

CLIMATOLOGICAL SUMMARY.  Period of Record: Jul 1998 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        |  37.7  38.9  47.5  56.6  65.4  77.3  89.7  86.5  74.0  59.2  47.4  37.5 |   59.8
Avg Min Temp        |  15.6  16.6  22.7  30.8  39.2  47.8  57.3  54.5  44.2  32.9  22.9  15.2 |   33.3
Avg Temperature     |  26.7  27.8  35.1  43.7  52.3  62.6  73.5  70.5  59.1  46.0  35.1  26.3 |   46.6
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    63    64    83    81    91   104   107   103    98    89    76    63 |    107
                    |                                                                         |
    Date of Ext-Day |    23    27    03    28    13    29    29    10    04    01    07    27 |
               -Year|  2005  2006  2006  2007  2001  2002  2006  2000  1998  2005  1999  1998 |
                    |                                                                         |
    Extreme Min Temp|   -22   -25   -21    -6    15    31    37    32    24     0   -11   -24 |    -25
                    |                                                                         |
    Date of Ext-Day |    06    01    02    02    02    02    12    17    14    30    11    20 |
               -Year|  2004  2007  2002  2002  2005  2000  2008  2002  2007  2002  2000  1998 |
                    |                                                                         |
Heating Degree Days |  1188  1052   927   639   400   143     8    30   230   589   896  1199 |   7301
Cooling Degree Days |     0     0     0     0     6    71   271   199    53     2     0     0 |    601
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.2   4.0  17.2  12.2   3.8   0.0   0.0   0.0 |   37.4
    Max Temp >= 75  |   0.0   0.0   0.6   2.6   6.7  17.7  29.4  28.0  15.7   4.0   0.5   0.0 |  105.1
    Max Temp <= 32  |   8.5   7.8   4.5   1.1   0.0   0.0   0.0   0.0   0.1   1.0   5.1   9.5 |   37.7
                    |                                                                         |
    Min Temp <= 32  |  29.0  26.6  26.9  16.5   5.9   0.3   0.0   0.1   2.5  14.7  25.2  29.4 |  177.1
    Min Temp <= 20  |  18.9  17.0  11.1   3.5   0.6   0.0   0.0   0.0   0.0   2.6  11.3  18.7 |   83.8
    Min Temp  <= 0  |   4.1   2.9   0.9   0.2   0.0   0.0   0.0   0.0   0.0   0.1   1.4   4.2 |   13.8
                    |                                                                         |
Avg Dew Point Temp  |  15.5  16.7  22.5  28.9  37.9  45.3  48.5  45.9  37.4  30.3  20.6  15.1 |   30.4
Avg Wet Bulb Temp   |  23.2  24.0  30.1  37.2  45.3  53.1  58.9  56.6  47.8  38.8  29.6  22.7 |   38.9
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.11 30.09 30.06 30.08 29.99 29.96 29.92 29.93 29.99 30.07 30.11 30.12 |  30.04
(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   |   0.0   0.0   0.1   0.0   0.2   0.9   0.4   0.5   0.1   0.0   0.0   0.0 |    2.1
    Heavy Fog       |   0.6   1.3   1.2   1.1   0.6   0.0   0.1   0.3   0.2   0.2   0.6   0.8 |    7.0
    Fog             |   8.6   9.5   9.8   8.8   7.1   4.6   3.0   2.7   4.5   5.9   6.3   6.0 |   76.9
    Hail            |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.20  0.31  0.69  1.61  2.63  1.69  1.31  0.67  1.06  1.37  0.34  0.22 |  12.10
                    |                                                                         |
Maximum Daily       |  0.23  0.36  0.83  0.95  2.77  1.45  1.23  0.81  1.06  1.37  0.61  0.25 |   2.77
                    |                                                                         |
    Date of Ext-Day |    27    12    28    09    05    07    23    04    10    28    09    08 |
               -Year|  2000  2007  2007  1999  2007  2007  2004  1999  2003  1998  2006  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   5.2   6.7   8.0  10.7  11.4   9.7   7.6   5.9   7.7   9.0   5.4   5.2 |   92.6
    >= 0.10         |   0.4   1.0   1.9   4.4   5.6   4.5   3.4   1.9   3.3   3.4   1.2   0.5 |   31.5
    >= 0.25         |   0.0   0.1   0.5   2.1   2.6   2.3   1.9   0.8   1.4   1.3   0.2   0.1 |   13.2
    >= 0.50         |   0.0   0.0   0.2   0.7   1.6   0.9   0.6   0.2   0.3   0.8   0.1   0.0 |    5.3
    >= 1.00         |   0.0   0.0   0.0   0.0   0.3   0.1   0.1   0.0   0.1   0.3   0.0   0.0 |    0.9
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|  11.6  11.5  11.4  11.6  11.2  10.0   9.2   9.7   9.4  10.1  11.2  11.8 |   10.7
Daily Avg Max 2-Min |  23.7  23.4  24.0  24.8  25.0  24.7  24.1  23.8  21.8  22.2  23.5  23.8 |   23.7
Daily Avg Peak Gust |  28.2  27.8  28.6  29.9  30.4  30.6  29.9  29.5  26.8  27.0  28.2  28.5 |   28.8
                    |                                                                         |
Maximum Daily Avg   |  37.9  30.5  29.3  28.1  32.0  22.8  21.9  19.8  22.6  23.6  29.5  28.3 |   37.9
                    |                                                                         |
Maximum 2-Minute Avg|    52    44    47    45    51    52    52    56    41    45    47    49 |     56
                    |                                                                         |
Date of Max 2min-Day|    27    16    27    02    01    02    19    16    08    23    22    01 |
               -Year|  2008  2003  2007  2000  2001  2003  1998  2002  2004  2001  1998  2001 |
                    |                                                                         |
Maximum Peak Gust   |    68    53    54    55    60    62    69    64    47    87    57    58 |     87
                    |                                                                         |
Date of Max Gust-Day|    27    09    27    02    01    12    19    01    25    11    22    01 |
               -Year|  2008  1999  2002  2000  2001  2001  1998  2000  1998  2000  1998  2001 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |  12.7  11.3  12.4  14.9  15.4  15.2  13.5  14.7  10.4  10.8  12.7  13.1 |  157.1
   Peak Gust >=40   |   3.6   2.9   3.4   3.7   4.9   5.0   3.5   3.6   2.3   2.5   4.0   4.4 |   43.8
   Peak Gust >=50   |   0.8   0.4   0.5   0.4   1.1   0.7   1.0   0.8   0.0   0.5   0.8   0.8 |    7.9
                    |                                                                         |
   Max 2-Minute >=30|   6.5   5.5   6.3   7.2   8.0   7.1   5.9   6.5   3.8   4.3   6.8   0.0 |   68.0
   Max 2-Minute >=40|   0.9   0.7   1.0   0.6   1.4   1.3   1.0   0.7   0.2   0.6   1.1   0.0 |    9.5
                    |                                                                         |
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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.