STATION:  SAN DIEGO INTERNATIONAL AIRPORT (KSAN), 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        |  64.5  64.6  65.4  66.3  68.6  70.6  74.3  76.1  75.2  72.5  68.8  64.8 |   69.3
Avg Min Temp        |  49.7  50.7  53.5  55.5  59.7  62.4  65.6  67.0  65.3  60.4  54.6  48.9 |   57.8
Avg Temperature     |  57.1  57.6  59.5  60.9  64.1  66.5  70.0  71.5  70.3  66.5  61.7  56.9 |   63.5
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    87    87    91    94    93    96    99    90    96    94    90    83 |     99
                    |                                                                         |
    Date of Ext-Day |    19    22    29    27    02    27    22    21    05    08    02    18 |
               -Year|  2005  2002  2004  2008  2004  2006  2006  1997  2004  2008  1997  2004 |
                    |                                                                         |
    Extreme Min Temp|    35    41    44    45    50    54    60    50    56    48    41    39 |     35
                    |                                                                         |
    Date of Ext-Day |    15    01    30    01    01    03    04    20    20    21    30    27 |
               -Year|  2007  2002  1998  1999  1999  1999  1998  1997  1997  2002  2004  1997 |
                    |                                                                         |
Heating Degree Days |   249   209   179   133    58    17     1     0     0    20   114   252 |   1234
Cooling Degree Days |     4     2     7    10    31    61   155   202   158    65    15     0 |    709
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.1   0.1   0.2   0.2   0.1   0.1   0.5   0.3   0.1   0.0 |    1.6
    Max Temp >= 75  |   2.9   1.9   2.7   2.4   3.7   3.7  11.6  20.6  14.1   8.4   4.5   1.9 |   78.4
    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  |   0.0   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 <= 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  |  44.7  46.0  47.9  49.5  54.1  57.0  60.9  62.5  60.7  54.7  49.4  43.3 |   52.6
Avg Wet Bulb Temp   |  50.9  51.7  53.3  54.6  58.2  60.6  64.1  65.6  64.2  59.6  55.2  50.3 |   57.4
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.11 30.08 30.04 30.02 29.97 29.93 29.94 29.92 29.90 29.96 30.05 30.11 |  30.00
(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   |   0.2   0.4   0.2   0.2   0.0   0.0   0.2   0.2   0.3   0.1   0.3   0.2 |    2.3
    Heavy Fog       |   1.6   0.7   0.8   0.4   0.2   0.1   0.2   0.2   1.2   2.0   2.6   2.5 |   12.5
    Fog             |  15.8  12.8  13.1   9.2  10.7  10.4   9.8  14.0  12.4  13.5  13.9  12.8 |  148.2
    Hail            |   0.0   0.0   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.2
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.67  2.65  0.92  0.74  0.18  0.02  0.03  0.01  0.11  0.77  0.76  1.17 |   9.03
                    |                                                                         |
Maximum Daily       |  1.08  2.18  1.12  1.06  0.77  0.07  0.20  0.09  0.76  2.70  1.26  1.60 |   2.70
                    |                                                                         |
    Date of Ext-Day |    03    21    04    14    22    08    20    06    25    27    27    29 |
               -Year|  2005  2005  2005  2003  2006  1998  1998  1997  1997  2004  2008  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   6.7   7.8   6.0   4.6   1.4   0.6   0.5   0.2   0.9   2.8   3.6   5.8 |   41.0
    >= 0.10         |   3.7   4.8   1.9   2.2   0.6   0.0   0.1   0.0   0.2   1.2   1.8   2.5 |   19.0
    >= 0.25         |   2.3   2.9   1.2   1.2   0.2   0.0   0.0   0.0   0.1   0.8   0.9   1.4 |   11.2
    >= 0.50         |   1.2   1.8   0.6   0.2   0.1   0.0   0.0   0.0   0.1   0.5   0.4   0.5 |    5.3
    >= 1.00         |   0.2   0.8   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.2   0.2 |    1.7
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.8   5.9   6.4   7.1   6.9   7.0   6.5   6.5   6.4   5.4   4.6   4.5 |    6.0
Daily Avg Max 2-Min |  14.3  16.0  15.8  16.1  14.7  14.2  13.6  14.0  14.6  14.3  13.8  14.2 |   14.6
Daily Avg Peak Gust |  17.2  19.2  19.1  19.5  17.8  17.3  16.8  17.0  17.5  17.2  16.6  17.0 |   17.7
                    |                                                                         |
Maximum Daily Avg   |  14.7  16.0  18.0  15.4  12.9  11.7   9.6  10.1  11.6  13.1  16.5  15.0 |   18.0
                    |                                                                         |
Maximum 2-Minute Avg|    31    38    38    32    26    23    21    23    22    30    55    46 |     55
                    |                                                                         |
Date of Max 2min-Day|    11    23    05    03    12    25    24    26    02    20    14    29 |
               -Year|  2001  1998  2000  1999  1998  2000  2006  2007  2003  2004  2006  2004 |
                    |                                                                         |
Maximum Peak Gust   |    44    46    45    37    32    25    23    29    25    39    59    58 |     59
                    |                                                                         |
Date of Max Gust-Day|    27    13    05    03    12    13    24    26    02    20    14    29 |
               -Year|  2008  2001  2000  1999  1998  1997  1997  2007  2003  2004  2006  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.1   2.2   1.3   1.1   0.2   0.0   0.0   0.0   0.0   0.5   0.5   1.8 |    8.6
   Peak Gust >=40   |   0.1   0.2   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   0.2 |    0.7
   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   0.1 |    0.2
                    |                                                                         |
   Max 2-Minute >=30|   0.3   0.3   0.3   0.2   0.0   0.0   0.0   0.0   0.0   0.1   0.2   0.0 |    1.5
   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.