STATION:  CASPER-NATRONA COUNTY INTERNATIONAL AP (KCPR), WY

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        |  36.1  38.6  48.2  56.6  68.1  79.3  90.4  86.5  74.4  60.0  46.4  35.5 |   60.0
Avg Min Temp        |  15.3  17.0  21.7  28.4  37.1  44.7  54.0  51.8  42.1  31.4  22.8  15.1 |   31.8
Avg Temperature     |  25.7  27.8  34.9  42.5  52.6  62.0  72.2  69.1  58.3  45.7  34.6  25.3 |   45.9
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    57    61    75    82    95   100   104   101    96    84    72    59 |    104
                    |                                                                         |
    Date of Ext-Day |    31    01    31    29    29    30    16    06    04    11    06    01 |
               -Year|  2003  2003  2004  2007  2003  2002  2005  2001  1998  1996  1999  1998 |
                    |                                                                         |
    Extreme Min Temp|   -19   -32    -8    -6    17    31    34    34    24     9   -19   -25 |    -32
                    |                                                                         |
    Date of Ext-Day |    11    17    02    12    01    06    02    07    26    30    11    20 |
               -Year|  1997  2006  2002  1997  2005  1998  1997  1996  1996  2002  2000  1998 |
                    |                                                                         |
Heating Degree Days |  1218  1051   932   675   388   139     7    25   231   599   912  1231 |   7408
Cooling Degree Days |     0     0     0     0     4    48   230   153    29     0     0     0 |    466
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   5.2  18.7  11.9   2.0   0.0   0.0   0.0 |   38.1
    Max Temp >= 75  |   0.0   0.0   0.1   1.6   9.9  21.3  29.9  28.9  17.0   4.0   0.0   0.0 |  112.7
    Max Temp <= 32  |  10.9   7.5   4.3   1.5   0.0   0.0   0.0   0.0   0.2   1.0   5.5  12.1 |   42.9
                    |                                                                         |
    Min Temp <= 32  |  28.8  26.6  27.7  20.8   8.2   0.3   0.0   0.0   3.1  16.9  23.7  28.7 |  184.9
    Min Temp <= 20  |  19.6  16.8  12.5   4.5   0.3   0.0   0.0   0.0   0.0   2.9  11.4  19.5 |   87.5
    Min Temp  <= 0  |   3.9   2.2   1.3   0.3   0.0   0.0   0.0   0.0   0.0   0.0   1.7   3.8 |   13.2
                    |                                                                         |
Avg Dew Point Temp  |  14.6  16.3  20.9  26.1  34.8  39.8  44.4  43.1  36.2  28.4  20.0  14.5 |   28.2
Avg Wet Bulb Temp   |  22.3  23.7  29.4  35.5  43.8  50.4  56.5  54.7  46.9  37.6  28.9  21.7 |   37.6
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.10 30.08 30.06 30.06 29.98 29.93 29.91 29.93 29.98 30.07 30.11 30.14 |  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   |   0.0   0.0   0.2   0.6   3.8   5.8   6.5   5.4   2.3   0.2   0.0   0.0 |   24.7
    Heavy Fog       |   1.2   2.4   2.9   1.5   0.8   0.7   0.3   0.2   0.5   1.9   1.8   1.4 |   15.7
    Fog             |   9.0   9.5   9.9   9.3   6.7   4.6   2.7   3.2   4.4   7.3   7.3   7.4 |   81.2
    Hail            |   0.0   0.0   0.0   0.1   0.2   0.2   0.2   0.1   0.0   0.0   0.0   0.0 |    0.8
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.34  0.43  0.65  1.15  1.90  1.27  1.76  1.03  1.08  1.16  0.45  0.35 |  11.56
                    |                                                                         |
Maximum Daily       |  0.31  0.33  0.50  0.62  2.22  2.12  2.34  2.21  0.75  2.06  0.49  0.29 |   2.34
                    |                                                                         |
    Date of Ext-Day |    27    05    28    29    17    16    11    02    17    16    26    24 |
               -Year|  2000  2006  2007  1997  2000  2003  2006  2007  2003  1998  2004  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   5.7   6.4   7.6   9.4  10.0   8.5   7.2   6.2   7.8   7.2   5.6   5.9 |   87.5
    >= 0.10         |   1.2   1.4   2.4   4.1   3.8   3.5   3.1   2.5   3.4   3.1   1.8   1.2 |   31.4
    >= 0.25         |   0.2   0.4   0.5   1.4   2.3   1.5   1.9   1.2   1.9   1.5   0.3   0.2 |   13.4
    >= 0.50         |   0.0   0.0   0.1   0.2   1.1   0.3   1.1   0.5   0.5   0.5   0.0   0.0 |    4.1
    >= 1.00         |   0.0   0.0   0.0   0.0   0.2   0.2   0.5   0.2   0.0   0.1   0.0   0.0 |    1.2
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|  14.8  13.6  12.5  11.4  10.5  10.2   8.9   9.3   9.8  10.9  13.4  15.1 |   11.7
Daily Avg Max 2-Min |  27.6  26.0  25.7  25.3  24.7  26.1  24.8  23.7  22.9  23.7  26.1  28.3 |   25.4
Daily Avg Peak Gust |  32.6  31.0  30.6  31.1  30.7  32.5  31.2  29.6  28.4  28.7  31.2  33.9 |   31.0
                    |                                                                         |
Maximum Daily Avg   |  31.5  31.5  27.7  26.0  26.8  27.3  20.4  21.7  21.2  25.1  29.3  31.6 |   31.6
                    |                                                                         |
Maximum 2-Minute Avg|    64    51    49    49    45    54    52    46    44    51    51    53 |     64
                    |                                                                         |
Date of Max 2min-Day|    05    02    16    20    22    02    13    19    16    18    24    25 |
               -Year|  2008  1999  1999  2008  2002  2002  2003  2006  2003  2004  1998  2008 |
                    |                                                                         |
Maximum Peak Gust   |    78    66    60    63    54    66    81    58    59    61    63    68 |     81
                    |                                                                         |
Date of Max Gust-Day|    05    02    16    30    19    02    27    19    16    23    13    25 |
               -Year|  2008  1999  1999  2006  1999  2002  2008  2006  2005  2001  2007  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |  18.6  15.9  16.5  15.0  16.5  16.8  15.8  14.5  11.9  13.9  16.9  20.4 |  192.6
   Peak Gust >=40   |   7.9   4.7   5.7   5.0   4.9   5.7   4.8   4.0   3.5   3.3   6.2   9.2 |   64.9
   Peak Gust >=50   |   2.2   0.8   1.4   1.5   0.7   1.4   1.5   0.5   0.2   0.9   1.5   2.3 |   14.8
                    |                                                                         |
   Max 2-Minute >=30|  13.9   8.9   9.5   7.9   7.7   8.9   7.0   6.2   4.8   5.9   9.4   0.0 |   90.2
   Max 2-Minute >=40|   2.5   1.3   2.0   1.2   0.9   1.4   1.4   0.4   0.6   1.2   2.2   0.0 |   15.0
                    |                                                                         |
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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.