STATION:  BARSTOW-DAGGETT AIRPORT (KDAG), CA

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        |  61.7  64.5  73.6  78.5  90.4  99.6 105.6 104.1  95.6  83.3  69.8  60.4 |   82.3
Avg Min Temp        |  37.0  39.6  45.9  50.3  60.6  68.3  74.4  73.4  65.3  54.8  43.1  35.3 |   54.0
Avg Temperature     |  49.3  52.1  59.8  64.4  75.5  83.9  90.0  88.8  80.5  69.0  56.5  47.9 |   68.1
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    80    83    94    99   109   114   118   114   108   100    90    80 |    118
                    |                                                                         |
    Date of Ext-Day |    02    01    20    27    28    15    05    05    01    01    08    18 |
               -Year|  1997  2003  1997  2000  2000  2000  2007  1998  1996  2000  2006  1998 |
                    |                                                                         |
    Extreme Min Temp|    14    21    26    34    40    51    56    60    47    40    21    21 |     14
                    |                                                                         |
    Date of Ext-Day |    15    12    03    04    13    05    01    31    30    12    30    22 |
               -Year|  2007  1999  2002  1999  1998  1999  1997  2000  2007  2008  2006  1998 |
                    |                                                                         |
Heating Degree Days |   486   366   192   105    13     0     0     0     0    40   260   531 |   1993
Cooling Degree Days |     1     0    29    87   339   568   776   737   465   164     4     0 |   3170
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.8   4.4  18.2  26.8  30.7  30.8  24.3   8.2   0.1   0.0 |  144.4
    Max Temp >= 75  |   0.8   2.3  15.9  20.1  28.7  29.7  31.0  31.0  29.8  25.7   9.0   0.5 |  224.6
    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  |   7.7   3.7   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.8  10.8 |   24.9
    Min Temp <= 20  |   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.3
    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  |  25.5  26.9  29.3  30.8  34.2  36.0  43.7  43.1  39.0  33.4  27.5  24.9 |   32.9
Avg Wet Bulb Temp   |  38.7  41.2  45.7  48.5  54.6  58.4  63.6  62.5  58.1  51.1  43.3  37.8 |   50.3
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.11 30.03 29.97 29.89 29.81 29.79 29.79 29.80 29.83 29.91 30.05 30.12 |  29.93
(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   0.2   0.0   0.3   1.0   0.8   3.8   3.4   1.5   0.3   0.1   0.0 |   11.3
    Heavy Fog       |   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
    Fog             |   2.4   3.0   1.4   0.6   0.0   0.0   0.1   0.2   0.1   0.8   0.8   1.5 |   10.8
    Hail            |   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.37  0.72  0.36  0.26  0.04  0.07  0.34  0.06  0.13  0.10  0.52  0.28 |   3.27
                    |                                                                         |
Maximum Daily       |  0.51  0.66  0.60  0.57  0.29  0.27  1.17  0.18  0.72  0.55  1.57  0.71 |   1.57
                    |                                                                         |
    Date of Ext-Day |    03    25    02    12    23    22    24    07    04    27    30    06 |
               -Year|  2005  2003  2004  1999  2008  2000  2002  2001  1998  2004  2007  1997 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   3.0   4.3   2.4   2.4   0.7   0.5   1.5   0.8   1.3   0.7   1.4   1.4 |   20.4
    >= 0.10         |   1.3   2.3   1.1   1.1   0.1   0.3   0.8   0.3   0.3   0.3   1.0   0.8 |    9.7
    >= 0.25         |   0.5   1.1   0.5   0.3   0.1   0.1   0.4   0.0   0.2   0.2   0.6   0.4 |    4.2
    >= 0.50         |   0.1   0.3   0.3   0.1   0.0   0.0   0.2   0.0   0.1   0.1   0.4   0.3 |    1.8
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.2   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|   7.8   9.2  11.6  14.5  13.7  13.7  11.3  10.5  10.2   9.4   8.2   7.6 |   10.6
Daily Avg Max 2-Min |  18.9  20.4  23.6  27.4  26.4  26.3  24.2  23.0  21.5  19.8  18.5  18.4 |   22.4
Daily Avg Peak Gust |  22.4  24.4  28.4  33.2  32.0  32.0  29.3  27.6  26.0  23.7  21.8  21.6 |   26.9
                    |                                                                         |
Maximum Daily Avg   |  26.7  28.1  30.4  31.5  30.8  33.1  22.0  22.2  27.0  30.0  28.4  27.6 |   33.1
                    |                                                                         |
Maximum 2-Minute Avg|    46    58    54    48    51    55    39    46    44    48    46    47 |     58
                    |                                                                         |
Date of Max 2min-Day|    28    03    13    20    04    04    16    25    03    16    22    27 |
               -Year|  2008  2008  2002  2008  2007  2008  2002  2000  2003  2007  2001  2006 |
                    |                                                                         |
Maximum Peak Gust   |    58    71    64    58    60    63    52    62    54    55    54    56 |     71
                    |                                                                         |
Date of Max Gust-Day|    28    03    13    12    04    04    06    25    15    16    14    25 |
               -Year|  2008  2008  2002  2007  2007  2008  2007  2000  2006  2007  2006  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   7.2   8.4  13.2  19.0  18.6  18.7  12.7  11.0   9.2   6.2   5.7   6.3 |  136.2
   Peak Gust >=40   |   3.0   2.8   5.1   8.4   5.4   3.7   1.4   1.1   2.1   1.6   2.2   3.6 |   40.4
   Peak Gust >=50   |   0.4   0.5   1.4   1.9   1.1   0.6   0.1   0.2   0.2   0.5   0.7   0.7 |    8.3
                    |                                                                         |
   Max 2-Minute >=30|   4.0   4.7   8.3  12.5   9.2   6.9   3.4   2.7   4.0   3.5   3.2   0.0 |   62.4
   Max 2-Minute >=40|   0.8   0.9   2.0   2.7   2.1   0.8   0.0   0.1   0.2   0.7   1.0   0.0 |   11.2
                    |                                                                         |
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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.