STATION:  BUFFALO JOHNSON COUNTY AIRPORT (KBYG), WY

CLIMATOLOGICAL SUMMARY.  Period of Record: Aug 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        |  38.9  38.4  46.0  54.9  63.4  74.2  87.1  84.2  71.7  57.9  47.0  38.1 |   58.5
Avg Min Temp        |  17.3  17.5  23.8  32.0  40.2  48.7  58.7  56.0  46.1  35.0  25.0  16.8 |   34.8
Avg Temperature     |  28.1  27.9  34.9  43.5  51.8  61.5  72.9  70.1  58.9  46.5  36.0  27.4 |   46.6
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    66    67    77    80    91   102   104   103    98    85    80    70 |    104
                    |                                                                         |
    Date of Ext-Day |    25    04    31    29    13    29    14    03    04    01    07    12 |
               -Year|  2006  2005  2004  2007  2001  2002  2002  2001  1998  2001  1999  2005 |
                    |                                                                         |
    Extreme Min Temp|   -18   -19    -8     5    17    32    41    36    25     3    -9   -24 |    -24
                    |                                                                         |
    Date of Ext-Day |    05    17    02    02    02    05    12    17    22    31    11    21 |
               -Year|  2004  2006  2002  2002  2005  2001  2008  2002  2000  2002  2000  1998 |
                    |                                                                         |
Heating Degree Days |  1145  1047   934   647   415   164    13    32   237   576   870  1165 |   7245
Cooling Degree Days |     0     0     0     0     7    59   258   190    55     1     0     0 |    571
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.1   2.6  12.5   9.0   2.3   0.0   0.0   0.0 |   26.5
    Max Temp >= 75  |   0.0   0.0   0.3   1.8   5.3  14.8  28.9  27.0  13.6   3.0   0.2   0.0 |   95.0
    Max Temp <= 32  |   8.5   8.3   4.9   1.2   0.1   0.0   0.0   0.0   0.2   1.2   5.3   9.4 |   39.1
                    |                                                                         |
    Min Temp <= 32  |  29.7  27.2  26.0  15.9   5.4   0.1   0.0   0.0   1.2  10.5  22.2  29.4 |  167.5
    Min Temp <= 20  |  16.9  16.1  10.1   2.1   0.2   0.0   0.0   0.0   0.0   1.4   9.0  17.4 |   73.3
    Min Temp  <= 0  |   3.0   2.6   0.9   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.8   3.3 |   10.6
                    |                                                                         |
Avg Dew Point Temp  |  14.0  14.7  20.5  27.4  36.1  43.9  46.1  43.0  36.2  28.7  18.9  13.3 |   28.6
Avg Wet Bulb Temp   |  23.5  23.4  29.1  36.3  44.1  51.9  57.5  54.9  47.3  38.1  29.4  22.3 |   38.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.09 30.09 30.06 30.07 29.98 29.96 29.91 29.93 29.99 30.06 30.09 30.10 |  30.03
(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   0.0   0.3   0.6   2.9   5.8   6.1   4.9   1.8   0.2   0.0   0.0 |   22.7
    Heavy Fog       |   1.7   3.7   3.8   2.9   1.1   0.3   0.0   0.3   0.8   1.7   2.3   2.7 |   21.4
    Fog             |   9.0  10.0  11.8   8.6   6.6   4.7   1.8   1.6   5.2   6.4   6.1   7.6 |   79.3
    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     |  0.21  0.22  0.64  1.24  2.64  1.58  1.18  0.65  1.15  1.03  0.35  0.19 |  11.08
                    |                                                                         |
Maximum Daily       |  0.33  0.67  0.72  0.84  3.32  2.13  1.96  0.92  0.72  0.75  0.50  0.24 |   3.32
                    |                                                                         |
    Date of Ext-Day |    11    28    28    29    22    12    23    27    03    20    23    20 |
               -Year|  2000  2004  2007  1999  2008  2005  2004  2002  1999  2007  2002  1999 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   4.0   5.4   7.0  10.3  11.2  10.3   6.8   6.8   7.4   7.8   4.5   3.6 |   85.2
    >= 0.10         |   0.6   0.3   2.3   3.4   5.0   4.4   2.7   2.2   3.2   2.9   1.0   0.5 |   28.6
    >= 0.25         |   0.2   0.1   0.6   1.3   2.6   1.3   1.3   0.6   1.7   1.5   0.5   0.0 |   11.8
    >= 0.50         |   0.0   0.1   0.2   0.6   1.4   0.5   0.4   0.3   0.5   0.5   0.1   0.0 |    4.7
    >= 1.00         |   0.0   0.0   0.0   0.0   0.6   0.2   0.2   0.0   0.0   0.0   0.0   0.0 |    1.0
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   8.5   9.3   9.8  11.2  11.0   9.3   8.9   8.9   9.0   9.3   9.1   8.7 |    9.4
Daily Avg Max 2-Min |  22.3  23.2  24.1  25.2  25.1  23.8  23.8  23.5  21.3  22.7  22.5  23.0 |   23.4
Daily Avg Peak Gust |  27.2  28.2  29.3  30.9  30.8  30.0  29.9  29.4  26.6  28.1  27.6  28.1 |   28.8
                    |                                                                         |
Maximum Daily Avg   |  26.4  30.0  35.3  32.4  32.3  24.9  22.9  19.6  27.6  30.9  29.8  28.2 |   35.3
                    |                                                                         |
Maximum 2-Minute Avg|    58    61    53    54    54    55    54    51    45    56    54    58 |     61
                    |                                                                         |
Date of Max 2min-Day|    27    09    19    10    01    07    26    09    19    05    18    29 |
               -Year|  2008  1999  2004  1999  2008  2007  2008  2005  2000  1998  2005  2005 |
                    |                                                                         |
Maximum Peak Gust   |    76    71    64    64    69    77    69    62    54    69    70    68 |     77
                    |                                                                         |
Date of Max Gust-Day|    27    09    28    10    01    07    26    09    19    05    18    29 |
               -Year|  2008  1999  2007  1999  2008  2007  2008  2005  2000  1998  2005  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |  12.6  11.7  14.3  15.3  15.6  14.9  14.3  14.3  11.4  12.9  11.7  13.6 |  162.6
   Peak Gust >=40   |   5.0   5.2   5.7   6.9   6.5   4.7   4.9   4.6   3.2   4.8   5.5   6.6 |   63.6
   Peak Gust >=50   |   1.5   2.0   1.4   1.3   1.4   0.8   1.5   1.4   0.5   1.2   2.4   2.7 |   18.1
                    |                                                                         |
   Max 2-Minute >=30|   7.8   7.2   7.3   9.1   9.5   7.1   7.0   6.5   6.0   6.9   6.5   0.0 |   80.8
   Max 2-Minute >=40|   1.5   2.1   2.2   1.4   1.7   1.3   1.1   0.7   0.6   1.5   2.3   0.0 |   16.5
                    |                                                                         |
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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.