STATION:  YAKIMA AIR TERMINAL/MCALSR FIELD AP (KYKM), WA

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        |  38.7  47.1  56.2  63.4  72.6  79.8  89.5  87.3  78.2  63.5  48.1  37.0 |   63.5
Avg Min Temp        |  23.6  26.4  30.0  33.9  42.6  48.5  54.4  52.4  43.7  34.1  26.9  22.6 |   36.6
Avg Temperature     |  31.2  36.8  43.1  48.6  57.6  64.2  72.0  69.8  60.9  48.8  37.5  29.8 |   50.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    60    67    78    87    98   102   109   104    98    85    72    62 |    109
                    |                                                                         |
    Date of Ext-Day |    14    22    30    30    23    30    23    04    02    02    13    16 |
               -Year|  1999  2002  2003  1998  2001  2008  2006  1998  1998  2003  1999  1999 |
                    |                                                                         |
    Extreme Min Temp|   -14     5    15    18    25    32    36    37    25     4     4    -7 |    -14
                    |                                                                         |
    Date of Ext-Day |    04    18    08    19    08    06    03    31    23    31    02    28 |
               -Year|  2004  2006  2002  2008  1999  1999  1999  1999  2000  2002  2002  1996 |
                    |                                                                         |
Heating Degree Days |  1049   798   679   491   250    94    17    22   153   503   824  1092 |   5972
Cooling Degree Days |     0     0     0     0    21    70   232   173    32     0     0     0 |    527
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   1.6   4.4  16.7  12.9   2.3   0.0   0.0   0.0 |   37.9
    Max Temp >= 75  |   0.0   0.0   0.1   2.9  11.7  22.0  29.9  29.4  20.0   2.3   0.0   0.0 |  118.3
    Max Temp <= 32  |   6.9   0.7   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.9   8.9 |   18.3
                    |                                                                         |
    Min Temp <= 32  |  28.2  24.7  22.1  13.4   3.1   0.2   0.0   0.0   1.2  13.3  23.3  28.5 |  157.9
    Min Temp <= 20  |   9.4   4.8   1.3   0.4   0.0   0.0   0.0   0.0   0.0   0.9   6.0  10.3 |   33.1
    Min Temp  <= 0  |   0.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.8 |    1.3
                    |                                                                         |
Avg Dew Point Temp  |  26.1  27.6  30.0  32.4  38.7  42.9  47.5  47.7  42.1  34.8  30.1  25.3 |   35.4
Avg Wet Bulb Temp   |  29.3  32.9  37.9  42.1  49.0  53.6  58.9  57.8  51.0  41.9  34.4  28.2 |   43.1
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.16 30.15 30.07 30.01 29.98 29.94 29.93 29.93 29.97 30.08 30.16 30.21 |  30.05
(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   0.0   0.2   1.0   0.6   0.8   0.6   0.2   0.2   0.0   0.0 |    3.6
    Heavy Fog       |   6.0   1.8   0.4   0.1   0.1   0.0   0.0   0.0   0.1   0.5   2.8   6.1 |   17.9
    Fog             |  22.8  13.2   5.9   3.0   1.8   1.1   0.5   0.9   1.2   7.1  16.0  20.3 |   93.7
    Hail            |   0.0   0.0   0.2   0.1   0.0   0.0   0.1   0.0   0.0   0.0   0.1   0.1 |    0.5
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.11  0.78  0.45  0.48  0.51  0.41  0.21  0.24  0.20  0.48  1.05  1.69 |   7.60
                    |                                                                         |
Maximum Daily       |  0.57  0.79  0.44  0.64  0.49  0.61  0.47  0.51  0.51  0.74  1.70  1.38 |   1.70
                    |                                                                         |
    Date of Ext-Day |    16    07    23    26    19    27    03    22    15    30    19    31 |
               -Year|  1998  2002  1998  2003  2002  2001  1998  2004  2006  1997  1996  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   9.9   8.0   5.2   6.0   6.4   4.2   1.8   2.5   2.6   5.0   8.2  11.2 |   71.0
    >= 0.10         |   4.7   2.6   1.8   1.1   2.1   1.3   0.5   0.9   0.5   1.4   2.6   5.2 |   24.7
    >= 0.25         |   1.1   1.0   0.3   0.5   0.3   0.6   0.3   0.2   0.2   0.5   1.4   2.2 |    8.7
    >= 0.50         |   0.2   0.2   0.0   0.1   0.0   0.1   0.0   0.1   0.1   0.2   0.4   0.5 |    1.7
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.2 |    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|   4.1   5.3   6.6   7.0   7.1   7.3   6.7   6.4   6.1   5.4   4.5   3.7 |    5.9
Daily Avg Max 2-Min |  13.2  14.9  18.6  18.8  18.9  18.9  17.5  16.5  15.5  15.6  13.7  12.7 |   16.3
Daily Avg Peak Gust |  15.8  18.0  22.6  23.1  23.0  23.6  21.5  20.5  19.1  18.9  16.6  15.3 |   19.8
                    |                                                                         |
Maximum Daily Avg   |  16.0  20.5  15.8  16.6  15.6  18.2  18.4  13.6  16.5  14.8  16.9  15.9 |   20.5
                    |                                                                         |
Maximum 2-Minute Avg|    66    58    37    68    71    66    51    45    35    76    66    55 |     76
                    |                                                                         |
Date of Max 2min-Day|    08    15    16    04    27    25    30    05    08    12    17    09 |
               -Year|  2008  2008  2005  2008  2008  2008  2008  2003  2000  2008  2007  2008 |
                    |                                                                         |
Maximum Peak Gust   |    78    71    48    78    82    86    81    68    43    79    90    77 |     90
                    |                                                                         |
Date of Max Gust-Day|    08    15    16    04    27    21    30    12    25    12    17    09 |
               -Year|  2008  2008  2005  2008  2008  2008  2008  2007  1999  2008  2007  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.8   4.1   7.6   6.3   6.3   6.3   2.9   2.6   2.8   4.6   3.9   3.7 |   54.9
   Peak Gust >=40   |   1.0   1.3   0.8   1.0   0.3   0.9   0.2   0.3   0.2   1.1   0.6   1.2 |    8.8
   Peak Gust >=50   |   0.3   0.3   0.0   0.2   0.1   0.3   0.1   0.2   0.0   0.2   0.1   0.5 |    2.1
                    |                                                                         |
   Max 2-Minute >=30|   1.9   1.8   2.4   1.8   1.1   1.5   0.5   0.4   0.4   1.5   1.2   0.0 |   14.5
   Max 2-Minute >=40|   0.2   0.1   0.0   0.3   0.1   0.3   0.1   0.2   0.0   0.3   0.1   0.0 |    1.5
                    |                                                                         |
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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.