STATION:  YUMA MCAS (KNYL), AZ

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        |  68.3  74.8  84.9  88.1  97.0 104.2 106.8 106.2 100.0  91.6  80.5  68.7 |   89.3
Avg Min Temp        |  46.4  49.4  55.6  59.8  68.9  74.8  82.3  83.3  76.6  64.0  56.2  47.0 |   63.7
Avg Temperature     |  57.4  62.1  70.2  74.0  82.9  89.5  94.5  94.8  88.3  77.8  68.3  57.9 |   76.5
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    82    89   101   103   115   116   118   116   115   106    95    79 |    118
                    |                                                                         |
    Date of Ext-Day |    21    27    17    14    19    20    31    12    01    01    01    21 |
               -Year|  1997  2008  2007  2008  2008  2008  1996  1996  2007  2008  2008  2007 |
                    |                                                                         |
    Extreme Min Temp|    25    39    40    46    59    62    74    76    61    56    45    33 |     25
                    |                                                                         |
    Date of Ext-Day |    14    09    01    21    27    07    14    14    24    12    23    20 |
               -Year|  2007  1997  2007  2007  2008  1997  1997  1996  2007  2008  2007  2006 |
                    |                                                                         |
Heating Degree Days |   238   109    28    12     0     0     0     0     0     0    24   223 |    634
Cooling Degree Days |     2    27   191   280   556   736   916   923   698   397   124     1 |   4852
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0  10.4  14.6  26.9  28.3  31.0  31.0  28.3  20.7   2.0   0.0 |  193.3
    Max Temp >= 75  |   3.6  13.6  27.3  27.4  31.0  30.0  31.0  31.0  30.0  30.5  23.5   5.9 |  284.9
    Max Temp <= 32  |   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
                    |                                                                         |
    Min Temp <= 32  |   0.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.4
    Min Temp <= 20  |   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
    Min Temp  <= 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 |    0.0
                    |                                                                         |
Avg Dew Point Temp  |  28.4  30.2  31.1  33.3  40.3  43.1  57.6  63.7  56.0  34.4  36.7  30.3 |   40.4
Avg Wet Bulb Temp   |  43.6  47.2  51.8  54.1  60.1  63.5  69.4  74.0  68.6  54.5  52.2  45.6 |   57.1
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.06 30.02 29.95 29.86 29.78 29.76 29.75 29.73 29.76 29.90 29.96 30.08 |  29.88
(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   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Heavy Fog       |   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
    Fog             |   0.0   0.3   0.0   0.0   0.0   0.0   0.3   0.3   0.0   0.0   0.0   0.0 |    0.9
    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     |  0.16  0.04  0.01  0.04  0.02  0.03  0.23  0.23  0.06  0.03  0.74  0.16 |   1.75
                    |                                                                         |
Maximum Daily       |  0.30  0.13  0.04  0.10  0.03  0.06  0.74  0.25  0.16  0.05  2.22  0.44 |   2.22
                    |                                                                         |
    Date of Ext-Day |    27    28    23    23    05    13    20    29    10    29    26    17 |
               -Year|  2008  1997  2007  2008  2008  1997  2008  2008  2008  2007  2008  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   2.2   0.3   0.3   0.7   0.7   1.0   0.5   1.7   0.7   0.5   0.7   1.1 |   10.4
    >= 0.10         |   0.4   0.3   0.0   0.4   0.0   0.0   0.5   1.0   0.3   0.0   0.3   0.5 |    3.8
    >= 0.25         |   0.4   0.0   0.0   0.0   0.0   0.0   0.3   0.3   0.0   0.0   0.3   0.3 |    1.6
    >= 0.50         |   0.0   0.0   0.0   0.0   0.0   0.0   0.3   0.0   0.0   0.0   0.3   0.0 |    0.6
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.3   0.0 |    0.3
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   7.5   7.4   6.6   7.9   7.7   7.5   8.9   8.8   6.8   5.6   6.0   6.9 |    7.3
Daily Avg Max 2-Min |  17.6  18.1  17.3  18.7  17.7  17.6  19.3  19.8  17.5  15.8  15.9  17.0 |   17.7
Daily Avg Peak Gust |  21.7  22.9  21.8  23.2  22.7  21.8  24.0  24.1  21.6  20.5  19.7  20.6 |   22.0
                    |                                                                         |
Maximum Daily Avg   |  20.2  19.3  20.0  19.1  19.4  17.7  15.6  17.9  16.6  19.2  17.2  19.1 |   20.2
                    |                                                                         |
Maximum 2-Minute Avg|    34    37    44    38    35    35    40    46    55    29    36    36 |     55
                    |                                                                         |
Date of Max 2min-Day|    06    13    27    11    04    06    22    29    02    21    09    15 |
               -Year|  1997  1997  2007  2007  2007  2007  1997  2008  2007  2007  2008  1996 |
                    |                                                                         |
Maximum Peak Gust   |    41    43    55    47    45    40    48    56    84    39    51    41 |     84
                    |                                                                         |
Date of Max Gust-Day|    06    13    27    11    04    05    22    29    02    21    09    15 |
               -Year|  1997  1997  2007  2007  2007  2007  1997  2008  2007  2007  2008  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.8   5.4   4.1   5.1   4.8   2.3   6.3   5.3   3.3   5.2   2.7   4.0 |   54.4
   Peak Gust >=40   |   1.1   0.3   0.7   1.1   0.7   0.7   0.5   1.3   1.0   0.0   0.3   0.5 |    8.3
   Peak Gust >=50   |   0.0   0.0   0.3   0.0   0.0   0.0   0.0   0.7   0.7   0.0   0.3   0.0 |    2.0
                    |                                                                         |
   Max 2-Minute >=30|   1.5   1.0   1.0   1.5   1.4   1.7   0.8   1.3   1.7   0.0   0.3   0.0 |   12.1
   Max 2-Minute >=40|   0.0   0.0   0.3   0.0   0.0   0.0   0.3   0.7   0.7   0.0   0.0   0.0 |    1.9
                    |                                                                         |
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Observations of WEATHER may me innacurate due to early ASOS inconsistancies.  Average days
with Thunderstorms may be low due to poor 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.