STATION:  EVANSTON-UINTA CO BURNS FLD AP (KEVW), WY

CLIMATOLOGICAL SUMMARY.  Period of Record: Aug 1999 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        |  28.7  29.8  39.1  51.8  61.9  72.4  83.8  79.9  68.5  56.1  40.5  29.5 |   53.5
Avg Min Temp        |  13.1  13.5  21.4  28.6  36.9  44.8  54.0  51.3  41.5  32.6  21.7  13.9 |   31.1
Avg Temperature     |  20.9  21.7  30.2  40.2  49.4  58.6  68.9  65.6  55.0  44.4  31.1  21.7 |   42.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    49    48    66    75    85    90    94    93    85    77    68    50 |     94
                    |                                                                         |
    Date of Ext-Day |    27    28    21    29    29    30    04    06    15    01    15    01 |
               -Year|  2003  2003  2004  2007  2003  2001  2001  2001  2000  2001  1999  2008 |
                    |                                                                         |
    Extreme Min Temp|   -12   -15    -4     0    13    25    42    34    20    10    -5   -14 |    -15
                    |                                                                         |
    Date of Ext-Day |    30    07    02    06    08    13    18    27    28    30    23    07 |
               -Year|  2002  2003  2002  2000  2002  2001  2005  2004  1999  2002  2003  2005 |
                    |                                                                         |
Heating Degree Days |  1366  1224  1078   744   486   211    13    48   304   640  1016  1341 |   8472
Cooling Degree Days |     0     0     0     0     2    20   134    66     5     0     0     0 |    226
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.0   0.1   4.7   0.7   0.0   0.0   0.0   0.0 |    5.5
    Max Temp >= 75  |   0.0   0.0   0.0   0.1   4.1  14.7  29.8  26.6   9.6   0.7   0.0   0.0 |   85.6
    Max Temp <= 32  |  20.0  17.6   8.2   1.0   0.2   0.0   0.0   0.0   0.1   0.9   8.6  18.8 |   75.5
                    |                                                                         |
    Min Temp <= 32  |  30.7  28.1  28.8  21.6  10.6   2.1   0.0   0.0   4.4  15.6  26.1  30.8 |  198.7
    Min Temp <= 20  |  23.6  21.7  13.1   4.0   0.6   0.0   0.0   0.0   0.3   1.3  13.1  23.0 |  100.7
    Min Temp  <= 0  |   2.4   2.3   0.4   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.6   1.8 |    7.7
                    |                                                                         |
Avg Dew Point Temp  |  13.9  14.6  19.5  22.4  28.2  32.1  36.4  36.8  29.2  23.3  18.5  14.9 |   24.1
Avg Wet Bulb Temp   |  18.6  19.4  26.0  32.6  39.5  45.5  51.5  50.2  42.4  34.8  26.0  19.3 |   33.8
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.21 30.15 30.07 30.00 29.96 29.96 29.95 29.97 30.01 30.06 30.16 30.20 |  30.06
(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   0.7   2.6   5.1   8.1   7.6   2.7   0.7   0.0   0.0 |   27.6
    Heavy Fog       |   6.0   8.2   7.0   5.2   3.2   0.7   0.0   0.3   1.0   3.6   5.0   5.5 |   45.8
    Fog             |  14.7  14.8  12.2   9.7   6.7   3.7   0.9   2.1   4.3   6.9  10.2  13.2 |   99.5
    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     |  0.36  0.57  0.44  0.80  1.32  0.97  0.46  1.05  0.95  0.94  0.62  0.40 |   8.87
                    |                                                                         |
Maximum Daily       |  0.45  0.44  0.26  0.59  0.99  1.17  0.67  0.86  0.72  1.03  0.80  0.34 |   1.17
                    |                                                                         |
    Date of Ext-Day |    18    16    10    02    10    23    25    09    22    20    09    04 |
               -Year|  2000  2001  2000  2001  2005  2003  2007  2008  2000  2004  2004  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   6.7   8.9   8.3   8.6   8.0   6.7   5.3   7.8   7.3   7.2   7.5   7.7 |   90.0
    >= 0.10         |   1.0   1.8   1.0   2.9   3.5   2.8   1.1   3.0   3.2   3.2   1.9   1.2 |   26.6
    >= 0.25         |   0.2   0.4   0.1   0.6   1.8   1.4   0.6   1.0   1.2   0.7   0.5   0.3 |    8.8
    >= 0.50         |   0.0   0.0   0.0   0.1   0.8   0.2   0.2   0.5   0.4   0.3   0.3   0.0 |    2.8
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.1   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|   9.8   9.1  10.0  10.8  10.2  10.2   8.9   9.1   9.3   9.7   9.0  10.0 |    9.7
Daily Avg Max 2-Min |  20.1  19.2  21.2  25.3  24.9  25.7  24.2  24.5  23.4  22.2  19.9  20.1 |   22.6
Daily Avg Peak Gust |  23.3  22.1  25.0  30.9  30.9  32.2  30.7  30.8  29.3  27.4  23.8  23.7 |   27.5
                    |                                                                         |
Maximum Daily Avg   |  25.1  25.1  21.1  23.8  19.8  22.2  17.6  17.7  19.2  22.1  21.1  23.2 |   25.1
                    |                                                                         |
Maximum 2-Minute Avg|    46    45    40    52    53    52    49    46    47    46    44    41 |     53
                    |                                                                         |
Date of Max 2min-Day|    01    08    26    15    20    01    07    22    05    29    03    15 |
               -Year|  2004  2002  2003  2002  2008  2002  2004  2004  2002  2003  2005  2000 |
                    |                                                                         |
Maximum Peak Gust   |    55    55    48    63    77    62    63    62    64    59    55    51 |     77
                    |                                                                         |
Date of Max Gust-Day|    04    08    31    15    20    01    07    22    29    02    03    15 |
               -Year|  2008  2002  2004  2002  2008  2002  2004  2007  2007  2006  2005  2000 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   7.7   5.8   9.4  16.4  18.0  18.1  17.4  17.3  14.0  11.0   7.1   8.3 |  150.5
   Peak Gust >=40   |   2.8   1.1   1.6   3.9   4.1   5.1   2.9   3.3   2.8   2.8   1.9   1.8 |   34.1
   Peak Gust >=50   |   0.4   0.1   0.0   0.6   0.3   0.7   0.1   0.6   0.6   0.4   0.2   0.2 |    4.2
                    |                                                                         |
   Max 2-Minute >=30|   4.6   3.3   3.7   8.0   6.7   6.8   4.4   5.9   5.8   4.4   3.6   0.0 |   57.2
   Max 2-Minute >=40|   0.7   0.2   0.2   0.8   0.2   1.1   0.2   0.6   0.5   0.4   0.2   0.0 |    5.2
                    |                                                                         |
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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.