STATION:  STOCKTON METROPOLITAN AIRPORT (KSCK), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Sep 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        |  54.9  60.8  67.7  72.4  82.3  89.4  94.5  93.1  88.8  78.3  64.8  55.7 |   75.2
Avg Min Temp        |  38.7  40.2  42.5  45.6  51.6  56.6  59.9  59.0  56.1  48.9  42.7  38.0 |   48.3
Avg Temperature     |  46.8  50.5  55.1  59.0  67.0  73.0  77.2  76.1  72.5  63.6  53.8  46.8 |   61.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    68    74    87    96   107   107   115   109   113   100    84    69 |    115
                    |                                                                         |
    Date of Ext-Day |    08    25    16    26    31    14    23    04    19    01    02    08 |
               -Year|  2004  2006  2007  2004  2001  2000  2006  1998  1998  2001  1997  2006 |
                    |                                                                         |
    Extreme Min Temp|    20    26    31    32    40    46    49    50    45    36    26    20 |     20
                    |                                                                         |
    Date of Ext-Day |    13    02    07    08    17    09    04    15    30    31    23    24 |
               -Year|  2007  2002  1998  2001  1998  1999  1999  1999  2007  2002  2003  1998 |
                    |                                                                         |
Heating Degree Days |   564   410   308   197    51     3     0     0     4    89   338   563 |   2527
Cooling Degree Days |     0     0     1    17   112   243   378   343   228    44     1     0 |   1366
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.8   7.2  14.8  24.0  21.6  14.6   2.2   0.0   0.0 |   85.1
    Max Temp >= 75  |   0.0   0.0   6.2  11.9  24.3  29.2  31.0  30.9  29.1  21.6   2.6   0.0 |  186.9
    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  |   7.0   2.8   0.4   0.2   0.0   0.0   0.0   0.0   0.0   0.0   1.8   8.0 |   20.1
    Min Temp <= 20  |   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.2
    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  |  40.9  42.7  44.2  44.1  47.5  50.1  54.2  53.6  51.4  45.4  43.7  39.0 |   46.4
Avg Wet Bulb Temp   |  43.7  46.5  49.4  51.2  55.9  59.6  63.1  62.4  59.9  53.5  47.8  42.1 |   52.9
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.14 30.08 30.05 30.01 29.94 29.88 29.88 29.88 29.87 29.97 30.09 30.14 |  29.99
(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   0.2   0.2   0.1   0.1   0.0   0.0   0.0   0.1   0.0   0.0   0.1 |    0.7
    Heavy Fog       |  10.3   4.9   1.8   0.3   0.1   0.0   0.0   0.0   0.0   0.5   6.4   8.7 |   32.9
    Fog             |  25.2  20.8  14.4   7.0   3.0   1.2   0.8   1.1   3.5   7.9  20.5  24.1 |  129.5
    Hail            |   0.1   0.0   0.0   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     |  2.92  2.67  1.38  1.01  0.62  0.06  0.04  0.06  0.07  0.74  1.72  2.51 |  13.79
                    |                                                                         |
Maximum Daily       |  1.46  1.46  1.09  1.02  1.02  0.16  0.03  0.06  0.29  1.29  1.50  1.92 |   1.92
                    |                                                                         |
    Date of Ext-Day |    02    03    22    04    12    03    17    22    20    19    08    21 |
               -Year|  2006  1998  2005  2006  1998  1997  2007  2003  2005  2004  2002  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  13.6  11.7   9.0   6.0   3.8   1.9   3.2   4.6   1.5   4.9  12.0  12.2 |   84.5
    >= 0.10         |   6.2   6.4   4.1   2.9   1.8   0.2   0.0   0.0   0.2   1.7   4.0   6.2 |   33.7
    >= 0.25         |   3.5   4.0   2.1   1.4   0.8   0.0   0.0   0.0   0.1   0.8   2.3   3.5 |   18.5
    >= 0.50         |   2.1   1.9   0.6   0.4   0.3   0.0   0.0   0.0   0.0   0.5   1.1   1.5 |    8.3
    >= 1.00         |   0.5   0.1   0.1   0.1   0.1   0.0   0.0   0.0   0.0   0.2   0.2   0.3 |    1.5
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   6.2   7.1   7.3   8.6   9.5   9.8   8.5   8.0   7.2   6.2   5.4   6.8 |    7.5
Daily Avg Max 2-Min |  15.3  16.8  16.8  19.1  19.6  19.8  17.5  16.9  15.7  14.7  14.2  15.9 |   16.9
Daily Avg Peak Gust |  18.0  20.2  20.3  23.2  23.9  23.9  20.9  20.2  19.2  18.1  17.0  19.0 |   20.3
                    |                                                                         |
Maximum Daily Avg   |  22.0  21.1  20.7  19.7  23.2  19.2  15.6  17.3  17.6  19.6  21.6  21.0 |   23.2
                    |                                                                         |
Maximum 2-Minute Avg|    61    41    36    37    41    34    31    30    31    39    47    41 |     61
                    |                                                                         |
Date of Max 2min-Day|    18    06    28    03    02    02    03    05    14    19    24    14 |
               -Year|  2008  1998  2006  1999  2001  1999  1999  2007  1997  2004  2001  2002 |
                    |                                                                         |
Maximum Peak Gust   |    62    54    43    44    48    43    38    39    38    48    58    51 |     62
                    |                                                                         |
Date of Max Gust-Day|    18    06    04    02    02    02    03    30    19    19    24    16 |
               -Year|  2008  1998  2001  1997  2001  1999  1999  2007  2007  2004  2001  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.4   4.9   3.5   5.4   4.0   3.6   1.0   0.5   0.9   2.0   2.0   4.8 |   35.9
   Peak Gust >=40   |   0.8   1.3   0.3   0.7   0.3   0.1   0.0   0.0   0.0   0.2   0.6   1.0 |    5.3
   Peak Gust >=50   |   0.4   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.1 |    0.8
                    |                                                                         |
   Max 2-Minute >=30|   1.6   2.6   0.8   1.8   0.8   0.5   0.1   0.1   0.2   0.6   0.8   0.0 |    9.9
   Max 2-Minute >=40|   0.4   0.2   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.2   0.0 |    0.8
                    |                                                                         |
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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.