STATION:  MODESTO CTY-CO H SHAM FD APT (KMOD), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: May 1998 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        |  54.6  61.1  68.0  72.8  82.5  90.2  95.0  93.4  88.3  77.9  64.7  55.7 |   75.4
Avg Min Temp        |  38.4  41.3  44.8  47.7  54.1  59.6  63.5  62.1  58.4  50.6  43.5  38.4 |   50.2
Avg Temperature     |  46.5  51.2  56.4  60.2  68.3  74.9  79.2  77.8  73.4  64.3  54.1  47.1 |   62.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    67    78    87    98   105   107   113   108   105    99    82    70 |    113
                    |                                                                         |
    Date of Ext-Day |    17    07    16    27    31    21    23    04    01    01    07    08 |
               -Year|  1999  2006  2007  2004  2001  2001  2006  1998  2007  2001  2006  2006 |
                    |                                                                         |
    Extreme Min Temp|    23    29    33    32    43    49    52    53    45    39    27    20 |     20
                    |                                                                         |
    Date of Ext-Day |    14    11    15    09    12    03    04    20    30    31    23    24 |
               -Year|  2007  1999  2002  1999  1998  1999  1999  2000  2007  1998  2003  1998 |
                    |                                                                         |
Heating Degree Days |   574   390   269   169    44     3     0     0     4    74   327   556 |   2409
Cooling Degree Days |     0     0     3    26   146   300   442   395   254    51     1     0 |   1618
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   1.2   7.5  16.6  25.3  22.9  13.7   1.3   0.0   0.0 |   88.5
    Max Temp >= 75  |   0.0   0.7   6.4  12.9  25.0  29.0  31.0  30.8  29.0  21.9   2.2   0.0 |  188.9
    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  |   6.9   1.6   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   1.2   6.8 |   16.6
    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   0.1 |    0.1
    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  |  40.2  41.9  43.4  42.5  45.6  48.9  53.0  52.4  50.3  45.9  44.5  39.8 |   45.7
Avg Wet Bulb Temp   |  43.3  46.6  49.7  51.1  55.9  60.0  63.4  62.3  60.0  53.9  48.8  43.4 |   53.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.16 30.09 30.06 30.01 29.93 29.88 29.87 29.87 29.87 29.97 30.10 30.16 |  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   |   1.1   1.3   0.6   0.7   0.3   0.4   0.3   0.4   0.5   1.0   1.4   1.5 |    9.4
    Heavy Fog       |  11.3   4.8   2.3   0.2   0.0   0.0   0.0   0.0   0.0   0.1   6.5   9.4 |   34.6
    Fog             |  25.9  21.2  15.1   7.9   2.8   0.9   0.6   1.4   3.5  11.9  21.5  23.7 |  136.5
    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     |  2.36  2.06  1.31  1.06  0.68  0.04  0.02  0.01  0.08  0.57  1.01  2.21 |  11.42
                    |                                                                         |
Maximum Daily       |  1.70  1.10  0.96  1.63  1.93  0.14  0.19  0.10  0.28  1.36  1.14  0.99 |   1.93
                    |                                                                         |
    Date of Ext-Day |    02    15    04    17    12    06    20    21    20    24    08    28 |
               -Year|  2006  2005  2001  2000  1998  1998  2006  2003  2005  1998  2002  2001 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  11.4  11.1   7.9   5.4   3.1   0.7   0.2   0.1   0.8   3.1  10.8  10.9 |   65.5
    >= 0.10         |   5.1   5.7   4.1   2.7   1.3   0.2   0.1   0.1   0.4   1.3   2.5   5.9 |   29.4
    >= 0.25         |   3.2   2.7   1.8   1.5   0.5   0.0   0.0   0.0   0.1   0.7   1.5   3.5 |   15.5
    >= 0.50         |   1.5   1.1   0.6   0.6   0.5   0.0   0.0   0.0   0.0   0.4   0.3   1.4 |    6.3
    >= 1.00         |   0.4   0.1   0.0   0.1   0.2   0.0   0.0   0.0   0.0   0.1   0.1   0.0 |    1.0
                    |                                                                         |
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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   5.5   6.7   7.6   8.7   9.0   8.2   7.7   6.5   5.4   4.6   5.1 |    6.7
Daily Avg Max 2-Min |  13.0  14.8  16.1  17.8  18.4  18.2  16.2  15.4  14.6  13.7  12.8  13.7 |   15.4
Daily Avg Peak Gust |  15.9  18.4  20.2  22.2  22.8  22.5  19.7  18.8  18.0  17.1  15.9  17.2 |   19.1
                    |                                                                         |
Maximum Daily Avg   |  15.6  17.1  19.1  18.2  20.6  19.0  12.9  12.7  15.0  17.3  15.9  15.9 |   20.6
                    |                                                                         |
Maximum 2-Minute Avg|    32    32    36    33    35    30    25    25    28    31    32    45 |     45
                    |                                                                         |
Date of Max 2min-Day|    07    14    13    03    22    08    07    03    17    19    24    03 |
               -Year|  2005  2008  2002  1999  2008  2002  2002  2001  2004  2004  2001  2008 |
                    |                                                                         |
Maximum Peak Gust   |    45    43    44    43    45    37    46    30    32    43    43    68 |     68
                    |                                                                         |
Date of Max Gust-Day|    07    14    13    15    21    10    14    25    17    19    24    03 |
               -Year|  2005  2008  2002  2007  2008  2008  2007  2008  2004  2004  2001  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.6   2.8   2.4   3.3   1.6   2.2   0.1   0.1   0.5   1.1   1.4   2.4 |   19.6
   Peak Gust >=40   |   0.1   0.4   0.2   0.4   0.3   0.0   0.1   0.0   0.0   0.1   0.2   0.4 |    2.1
   Peak Gust >=50   |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.1
                    |                                                                         |
   Max 2-Minute >=30|   0.2   0.2   0.5   0.8   0.3   0.2   0.0   0.0   0.0   0.1   0.2   0.0 |    2.5
   Max 2-Minute >=40|   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
                    |                                                                         |
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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.