STATION:  PHOENIX SKY HARBOR INTL AIRPORT (KPHX), AZ

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        |  67.4  69.6  77.5  84.1  95.6 104.0 106.3 104.3 100.2  88.6  76.5  66.1 |   86.7
Avg Min Temp        |  45.9  47.9  53.8  59.6  69.9  78.1  84.0  83.1  77.6  65.1  53.4  44.4 |   63.6
Avg Temperature     |  56.6  58.8  65.7  71.8  82.7  91.0  95.1  93.7  88.9  76.8  65.0  55.2 |   75.1
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    86    85    99   101   111   115   118   116   112   106    95    83 |    118
                    |                                                                         |
    Date of Ext-Day |    31    28    16    27    28    21    21    10    14    01    04    08 |
               -Year|  2003  1999  2007  2000  2003  2008  2006  2003  2000  2003  2001  1996 |
                    |                                                                         |
    Extreme Min Temp|    29    37    38    40    45    61    69    64    64    44    36    32 |     29
                    |                                                                         |
    Date of Ext-Day |    14    13    03    02    17    04    15    28    21    27    30    24 |
               -Year|  2007  2004  2002  1999  2005  1999  1999  2008  2004  1996  2004  1998 |
                    |                                                                         |
Heating Degree Days |   262   182    82    27     1     0     0     0     0     8    81   303 |    946
Cooling Degree Days |     2     7   102   232   551   780   934   890   717   375    80     1 |   4671
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   2.8   9.4  24.5  29.2  30.8  30.8  28.4  16.2   1.5   0.0 |  173.6
    Max Temp >= 75  |   5.2   7.6  19.3  25.3  30.7  30.0  31.0  31.0  30.0  28.8  18.3   3.2 |  260.4
    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  |   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2 |    0.5
    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  |  31.9  32.0  33.4  31.8  34.1  38.0  55.0  59.1  51.3  40.4  34.0  30.7 |   39.3
Avg Wet Bulb Temp   |  45.4  46.7  50.4  52.6  57.8  62.2  70.1  71.2  66.3  57.3  48.7  44.3 |   56.1
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.05 30.01 29.92 29.88 29.78 29.77 29.78 29.79 29.78 29.86 29.98 30.07 |  29.89
(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   |   0.6   0.7   0.8   0.4   0.2   0.6   5.0   4.7   3.1   1.9   0.5   0.2 |   18.7
    Heavy Fog       |   0.2   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.1   0.0   0.2 |    0.6
    Fog             |   2.8   3.6   1.6   1.4   0.0   0.0   1.1   1.1   0.9   1.5   0.8   3.1 |   17.8
    Hail            |   0.0   0.0   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.3
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.70  0.98  0.81  0.36  0.04  0.03  1.01  0.92  0.36  0.47  0.35  0.52 |   6.56
                    |                                                                         |
Maximum Daily       |  0.87  1.42  1.53  0.74  0.28  0.15  1.30  0.94  1.06  0.94  1.23  0.69 |   1.53
                    |                                                                         |
    Date of Ext-Day |    27    13    06    05    22    20    13    28    19    27    30    07 |
               -Year|  2008  2003  2000  2001  2008  2000  2008  2008  1999  2000  2007  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   3.2   4.3   3.0   2.2   0.4   0.4   4.0   4.8   2.9   2.5   1.9   3.4 |   33.1
    >= 0.10         |   1.8   2.5   1.3   1.1   0.2   0.2   2.2   2.4   1.0   1.4   0.8   1.6 |   16.3
    >= 0.25         |   1.0   1.3   0.9   0.4   0.1   0.0   1.1   1.2   0.3   0.9   0.5   0.8 |    8.5
    >= 0.50         |   0.4   0.5   0.5   0.2   0.0   0.0   0.8   0.7   0.1   0.2   0.2   0.2 |    3.7
    >= 1.00         |   0.0   0.1   0.3   0.0   0.0   0.0   0.3   0.0   0.1   0.0   0.1   0.0 |    0.8
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.9   5.5   6.5   7.2   7.1   7.2   7.3   6.8   6.2   5.6   4.9   4.6 |    6.2
Daily Avg Max 2-Min |  13.4  14.9  16.2  18.7  18.0  18.8  20.4  19.9  17.0  14.6  12.8  12.9 |   16.5
Daily Avg Peak Gust |  16.4  18.2  20.2  23.5  22.8  23.7  25.8  25.2  21.7  18.8  16.0  15.9 |   20.7
                    |                                                                         |
Maximum Daily Avg   |  13.9  12.9  82.2  16.1  15.1  14.8  12.7  11.4  11.6  14.5  15.1  12.8 |   82.2
                    |                                                                         |
Maximum 2-Minute Avg|    33    35    43    51    38    45    51    54    39    37    32    39 |     54
                    |                                                                         |
Date of Max 2min-Day|    04    18    06    21    22    25    23    28    06    21    09    20 |
               -Year|  2005  2004  1998  2001  2006  2006  2006  2008  2002  2004  2008  2002 |
                    |                                                                         |
Maximum Peak Gust   |    38    43    53    59    41    54    77    75    51    48    38    47 |     77
                    |                                                                         |
Date of Max Gust-Day|    04    18    06    21    22    25    18    28    19    25    09    20 |
               -Year|  2005  2004  1998  2001  2006  2006  2005  2008  1999  1998  2008  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.6   2.1   3.3   5.6   3.5   4.3   7.3   7.8   4.3   2.2   1.1   1.7 |   44.8
   Peak Gust >=40   |   0.0   0.2   0.3   1.0   0.3   0.4   2.3   1.9   0.7   0.3   0.0   0.2 |    7.7
   Peak Gust >=50   |   0.0   0.0   0.1   0.3   0.0   0.2   0.7   0.6   0.2   0.0   0.0   0.0 |    2.0
                    |                                                                         |
   Max 2-Minute >=30|   0.4   0.8   0.8   2.0   0.8   1.2   3.6   3.2   1.4   0.5   0.3   0.0 |   15.0
   Max 2-Minute >=40|   0.0   0.0   0.1   0.3   0.0   0.2   0.7   0.5   0.0   0.0   0.0   0.0 |    1.7
                    |                                                                         |
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Observations of WEATHER may me innacurate due to early ASOS inconsistancies.  Average days
with Thunderstorms may be low due to poor 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.