STATION:  SAN DIEGO-BROWN FIELD MUNICIPAL ARPT (KSDM), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Feb 1997 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        |  66.3  65.6  67.0  68.8  72.0  74.4  78.4  79.9  79.2  75.9  71.0  66.5 |   72.1
Avg Min Temp        |  43.7  44.8  46.8  49.0  54.3  57.8  61.3  62.2  60.2  55.1  48.5  43.1 |   52.2
Avg Temperature     |  55.0  55.2  56.9  58.9  63.1  66.1  69.9  71.1  69.7  65.5  59.8  54.8 |   62.2
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    90    93    97    97   101   103   110   104   104    99    95    87 |    110
                    |                                                                         |
    Date of Ext-Day |    06    22    20    27    03    27    22    01    24    16    02    21 |
               -Year|  2006  2002  1997  2008  2004  2006  2006  1997  1997  1997  1997  2005 |
                    |                                                                         |
    Extreme Min Temp|    27    32    35    34    41    44    54    53    50    45    32    32 |     27
                    |                                                                         |
    Date of Ext-Day |    14    01    01    10    01    05    06    08    20    30    30    07 |
               -Year|  2007  2002  1997  1999  1999  1999  2000  2002  1999  2004  2004  1998 |
                    |                                                                         |
Heating Degree Days |   315   280   256   193    84    24     0     0     4    50   177   316 |   1700
Cooling Degree Days |     5     3     5    10    26    57   151   187   144    65    20     1 |    674
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.1   0.2   0.4   0.5   0.6   0.8   0.7   1.6   2.3   2.2   0.9   0.0 |   10.2
    Max Temp >= 75  |   5.2   3.5   4.0   5.0   8.2  13.1  25.3  28.9  23.2  13.8   7.5   4.6 |  142.4
    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  |   0.6   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.3 |    1.1
    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  |  40.5  42.4  45.8  47.7  52.7  56.1  60.1  61.0  58.5  50.5  44.7  38.0 |   49.8
Avg Wet Bulb Temp   |  48.1  49.0  51.1  52.7  56.8  59.6  63.2  64.2  62.5  57.0  52.2  47.1 |   55.3
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.09 30.06 30.02 30.00 29.95 29.91 29.92 29.91 29.88 29.95 30.03 30.09 |  29.98
(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   0.1   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0 |    0.2
    Heavy Fog       |   4.1   2.6   4.3   2.8   3.1   3.0   3.7   4.4   5.4   3.8   4.5   3.6 |   45.2
    Fog             |  16.3  17.7  19.9  17.0  16.8  17.6  20.0  19.1  17.6  16.2  17.2  15.3 |  210.7
    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     |  1.54  2.74  1.08  0.94  0.20  0.06  0.05  0.03  0.17  0.62  0.73  1.18 |   9.35
                    |                                                                         |
Maximum Daily       |  1.15  2.36  0.91  1.31  0.58  0.08  0.10  0.09  1.04  1.56  1.27  1.70 |   2.36
                    |                                                                         |
    Date of Ext-Day |    11    22    15    14    22    25    31    09    25    27    26    17 |
               -Year|  2001  2004  2003  2003  2006  2000  2006  1998  1997  2004  2008  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   8.7  10.3   9.0   7.1   3.5   2.5   2.2   1.5   2.8   4.4   7.2   7.0 |   66.2
    >= 0.10         |   3.3   5.0   3.1   2.4   0.7   0.0   0.1   0.0   0.3   1.3   1.5   2.4 |   20.0
    >= 0.25         |   2.1   3.1   1.3   1.2   0.2   0.0   0.0   0.0   0.2   0.8   1.0   1.4 |   11.1
    >= 0.50         |   0.9   1.8   0.8   0.3   0.2   0.0   0.0   0.0   0.1   0.4   0.2   0.5 |    5.3
    >= 1.00         |   0.2   0.5   0.0   0.1   0.0   0.0   0.0   0.0   0.1   0.2   0.1   0.3 |    1.4
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.7   6.4   5.8   6.1   5.7   5.3   4.9   4.7   4.6   4.9   5.2   5.8 |    5.4
Daily Avg Max 2-Min |  14.2  15.7  14.8  15.4  14.6  14.1  13.6  13.6  13.7  13.9  14.1  14.5 |   14.3
Daily Avg Peak Gust |  17.2  19.1  18.4  19.5  18.4  18.0  17.1  16.9  17.1  17.3  17.4  17.7 |   17.8
                    |                                                                         |
Maximum Daily Avg   |  19.5  18.6  14.1  13.3  11.4  10.3   8.3   7.4  10.5  11.5  13.6  19.1 |   19.5
                    |                                                                         |
Maximum 2-Minute Avg|    37    37    32    29    25    30    21    22    29    28    71    45 |     71
                    |                                                                         |
Date of Max 2min-Day|    07    13    05    14    22    27    22    02    24    20    25    29 |
               -Year|  2003  2001  2000  2003  2008  2006  2006  2000  1997  2004  1997  2004 |
                    |                                                                         |
Maximum Peak Gust   |    44    45    39    37    31    41    24    25    36    36    87    52 |     87
                    |                                                                         |
Date of Max Gust-Day|    27    13    05    14    22    27    22    02    24    20    25    29 |
               -Year|  2008  2001  2000  2003  2008  2006  2006  2000  1997  2004  1997  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.2   1.6   1.0   0.7   0.1   0.2   0.0   0.0   0.2   0.8   1.9   2.0 |    9.5
   Peak Gust >=40   |   0.3   0.3   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.6   0.4 |    1.6
   Peak Gust >=50   |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.2 |    0.3
                    |                                                                         |
   Max 2-Minute >=30|   0.4   0.3   0.1   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.3   0.0 |    1.1
   Max 2-Minute >=40|   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0 |    0.1
                    |                                                                         |
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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.