STATION:  SAN DIEGO-MONTGOMERY FIELD AIRPORT (KMYF), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Feb 1998 to Dec 2008

Summaries based on unedited daily ASOS data.  Errors may be present.

-----------------------------------------------------------------------------------------------

TEMPERATURE (F)     |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Avg Max Temp        |  66.0  65.2  66.4  68.0  70.8  73.9  78.9  80.6  79.2  75.7  70.9  66.3 |   71.8
Avg Min Temp        |  44.9  46.1  48.9  51.1  56.3  59.8  63.9  64.9  62.3  57.2  50.3  44.4 |   54.2
Avg Temperature     |  55.4  55.7  57.7  59.6  63.5  66.9  71.4  72.7  70.7  66.5  60.6  55.4 |   63.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    88    91    92    97   102    99   106    98   104    97    94    90 |    106
                    |                                                                         |
    Date of Ext-Day |    31    22    29    26    03    21    22    29    03    08    11    01 |
               -Year|  2003  2002  2004  2004  2004  2008  2006  1998  2007  2008  2001  1998 |
                    |                                                                         |
    Extreme Min Temp|    30    33    39    37    44    48    57    59    53    47    34    32 |     30
                    |                                                                         |
    Date of Ext-Day |    14    01    30    02    01    05    06    03    21    12    30    24 |
               -Year|  2007  2002  1998  1999  1999  1999  2000  1999  2007  2008  2004  1998 |
                    |                                                                         |
Heating Degree Days |   300   266   233   176    74    19     0     0     2    37   151   300 |   1558
Cooling Degree Days |     3     2     6    13    29    75   199   240   173    82    18     1 |    841
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.1   0.1   0.6   0.7   1.0   1.6   2.0   2.7   2.4   0.5   0.1 |   11.7
    Max Temp >= 75  |   5.0   3.8   4.2   4.8   6.0  12.0  24.8  28.3  21.2  13.7   8.0   4.2 |  135.9
    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  |   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    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  |  40.5  42.7  45.8  47.4  52.0  56.2  60.1  61.0  58.3  51.4  45.7  39.6 |   50.1
Avg Wet Bulb Temp   |  47.9  49.2  51.4  53.0  56.5  60.0  63.4  64.5  62.8  57.6  52.7  47.5 |   55.5
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
Avg Sea Level Pres  | 30.10 30.06 30.02 30.00 29.95 29.91 29.92 29.90 29.88 29.95 30.04 30.10 |  29.99
(Inches of Mercury) |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
WEATHER             |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
See disclaimer below|                                                                         |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Thunderstorms   |   0.2   0.2   0.1   0.1   0.0   0.0   0.1   0.1   0.3   0.1   0.1   0.0 |    1.2
    Heavy Fog       |   3.9   2.8   2.8   1.6   2.2   1.5   1.5   2.0   3.7   3.4   4.5   3.5 |   33.3
    Fog             |  15.7  15.2  16.6  12.2  13.4  15.2  15.5  16.2  15.3  15.5  15.3  14.4 |  180.3
    Hail            |   0.0   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.3
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.65  2.63  1.26  0.98  0.24  0.03  0.03  0.01  0.08  0.76  0.76  1.20 |   9.63
                    |                                                                         |
Maximum Daily       |  1.18  1.78  1.05  1.29  0.64  0.07  0.24  0.02  0.14  2.71  1.59  1.70 |   2.71
                    |                                                                         |
    Date of Ext-Day |    09    21    04    14    22    27    31    28    07    27    30    17 |
               -Year|  2005  2005  2005  2003  2006  2006  2006  2003  2002  2004  2007  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   8.1   9.4   7.4   5.8   2.0   1.0   0.7   0.4   1.4   3.7   7.0   7.8 |   54.7
    >= 0.10         |   3.2   5.2   3.1   2.5   0.6   0.0   0.1   0.0   0.4   1.1   1.5   2.8 |   20.5
    >= 0.25         |   2.0   3.6   1.7   1.6   0.4   0.0   0.0   0.0   0.0   0.7   1.1   1.3 |   12.3
    >= 0.50         |   1.1   1.5   0.8   0.5   0.1   0.0   0.0   0.0   0.0   0.5   0.5   0.5 |    5.6
    >= 1.00         |   0.5   0.6   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.1   0.2 |    1.6
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.6   5.3   5.6   6.2   6.0   5.9   5.4   5.4   5.5   4.9   4.3   4.2 |    5.3
Daily Avg Max 2-Min |  14.2  15.1  15.0  15.6  14.5  13.6  13.2  13.0  13.6  13.8  13.3  13.8 |   14.1
Daily Avg Peak Gust |  17.0  18.4  18.5  19.5  18.0  17.2  16.3  16.4  16.8  16.7  16.0  16.6 |   17.3
                    |                                                                         |
Maximum Daily Avg   |  13.9  12.0  16.2  13.2  10.9   9.2   8.8   8.7  10.1  11.0  12.7  13.2 |   16.2
                    |                                                                         |
Maximum 2-Minute Avg|    30    37    34    70    23    20    20    23    21    30    26    35 |     70
                    |                                                                         |
Date of Max 2min-Day|    06    23    28    25    12    25    12    31    25    27    03    29 |
               -Year|  2003  1998  1998  2005  1998  2000  2002  1998  2001  2004  2000  2004 |
                    |                                                                         |
Maximum Peak Gust   |    39    49    43    87    30    26    23    28    26    37    33    47 |     87
                    |                                                                         |
Date of Max Gust-Day|    06    23    27    25    12    14    12    09    21    27    28    29 |
               -Year|  2003  1998  2007  2005  1998  2008  2002  1998  2007  2004  2002  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.1   1.3   1.1   0.8   0.1   0.0   0.0   0.0   0.0   0.4   0.6   1.2 |    6.6
   Peak Gust >=40   |   0.0   0.2   0.1   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.6
   Peak Gust >=50   |   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
   Max 2-Minute >=30|   0.1   0.3   0.2   0.2   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0 |    0.8
   Max 2-Minute >=40|   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
------------------------------------------------------------------------------------------------------

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.