STATION:  TUCSON INTERNATIONAL AIRPORT (KTUS), 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        |  66.2  68.4  75.2  81.7  92.8 100.4  99.7  97.3  95.0  85.3  75.2  65.4 |   83.6
Avg Min Temp        |  39.6  41.3  46.5  52.2  61.5  70.3  75.2  73.7  69.3  57.8  46.9  38.3 |   56.1
Avg Temperature     |  52.9  54.9  60.9  66.9  77.1  85.4  87.5  85.5  82.2  71.5  61.1  51.9 |   69.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    87    86    95    99   109   111   111   110   107   100    93    86 |    111
                    |                                                                         |
    Date of Ext-Day |    24    23    16    27    22    21    02    10    14    09    06    24 |
               -Year|  1999  2002  2007  2000  2005  2008  2001  2003  2000  1996  1999  2007 |
                    |                                                                         |
    Extreme Min Temp|    20    24    24    34    45    52    62    64    32    38    27    19 |     19
                    |                                                                         |
    Date of Ext-Day |    15    11    03    04    01    05    02    31    14    26    30    29 |
               -Year|  2007  1999  2002  1999  1999  1999  2004  2000  2004  1996  2004  2003 |
                    |                                                                         |
Heating Degree Days |   376   287   165    64     1     0     0     0     0    27   156   408 |   1485
Cooling Degree Days |     1     1    37   122   378   611   697   636   515   229    39     0 |   3265
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.8   6.2  22.2  28.9  29.0  28.8  25.0  11.2   0.8   0.0 |  152.7
    Max Temp >= 75  |   5.2   7.5  17.3  23.6  30.7  30.0  31.0  31.0  29.9  27.3  17.0   4.4 |  255.0
    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  |   4.4   2.0   0.6   0.0   0.0   0.0   0.0   0.0   0.1   0.0   1.0   6.5 |   14.6
    Min Temp <= 20  |   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2 |    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  |  27.8  26.4  27.4  27.5  29.9  37.2  56.1  60.1  51.6  38.3  29.8  26.7 |   36.6
Avg Wet Bulb Temp   |  41.7  42.7  45.8  48.9  54.0  59.6  67.6  68.1  63.8  54.1  45.2  40.5 |   52.7
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.05 30.00 29.93 29.89 29.80 29.77 29.83 29.85 29.81 29.89 29.99 30.06 |  29.91
(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   0.2   0.7   0.2   1.2   2.1   7.9  10.8   3.2   1.5   0.2   0.1 |   28.3
    Heavy Fog       |   0.2   0.0   0.1   0.0   0.0   0.0   0.1   0.0   0.1   0.1   0.0   0.1 |    0.6
    Fog             |   3.1   1.8   1.8   1.3   0.1   0.2   2.2   2.2   1.3   1.7   1.4   2.7 |   19.7
    Hail            |   0.0   0.1   0.2   0.1   0.0   0.0   0.2   0.2   0.1   0.1   0.0   0.0 |    0.8
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.49  0.73  0.59  0.39  0.14  0.27  2.62  2.02  1.10  0.78  0.41  0.62 |  10.15
                    |                                                                         |
Maximum Daily       |  0.60  0.94  0.82  1.17  0.44  0.58  1.90  2.29  1.72  1.61  1.00  0.64 |   2.29
                    |                                                                         |
    Date of Ext-Day |    22    15    29    01    27    19    31    23    03    26    12    23 |
               -Year|  2004  2008  1998  1999  2005  2000  2006  2005  1996  1996  2003  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   3.8   3.9   3.2   2.2   2.0   3.8  10.5   9.1   4.2   3.2   2.2   4.3 |   52.4
    >= 0.10         |   1.6   2.1   1.8   0.8   0.7   0.9   5.4   4.8   2.2   1.6   1.1   1.5 |   24.5
    >= 0.25         |   0.7   1.2   0.8   0.5   0.1   0.3   3.1   3.2   1.5   0.8   0.6   1.0 |   13.9
    >= 0.50         |   0.3   0.4   0.3   0.2   0.0   0.1   1.5   1.2   0.6   0.4   0.2   0.3 |    5.5
    >= 1.00         |   0.0   0.0   0.0   0.1   0.0   0.0   0.7   0.2   0.2   0.2   0.1   0.0 |    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|   6.6   7.0   7.5   8.0   7.8   7.8   7.4   7.0   7.3   7.3   6.8   6.5 |    7.3
Daily Avg Max 2-Min |  16.6  17.4  18.5  19.8  19.3  20.3  22.4  21.2  18.9  17.9  16.6  17.0 |   18.8
Daily Avg Peak Gust |  21.4  22.4  23.8  25.7  25.1  26.5  28.3  27.1  24.1  23.2  21.6  21.9 |   24.3
                    |                                                                         |
Maximum Daily Avg   |  22.5  18.5  20.9  17.2  17.4  15.5  13.4  22.4  17.3  22.9  20.2  19.1 |   22.9
                    |                                                                         |
Maximum 2-Minute Avg|    36    37    40    39    35    48    55    48    44    38    35    36 |     55
                    |                                                                         |
Date of Max 2min-Day|    07    03    31    06    21    03    02    13    10    09    05    23 |
               -Year|  2008  1998  2004  2002  2008  2006  2001  2000  2002  2000  2007  2003 |
                    |                                                                         |
Maximum Peak Gust   |    46    48    46    46    45    56    60    60    52    53    53    47 |     60
                    |                                                                         |
Date of Max Gust-Day|    02    24    31    21    21    03    02    27    10    13    12    13 |
               -Year|  2008  1998  2004  2001  2008  2006  2001  1999  2002  1996  2004  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   4.0   4.1   5.4   8.5   7.0   7.6  10.8  10.2   5.8   5.9   3.9   5.1 |   78.3
   Peak Gust >=40   |   0.3   0.3   0.9   1.0   0.4   1.1   3.1   2.7   1.1   0.9   0.4   0.4 |   12.6
   Peak Gust >=50   |   0.0   0.0   0.0   0.0   0.0   0.3   0.6   0.6   0.1   0.1   0.1   0.0 |    1.7
                    |                                                                         |
   Max 2-Minute >=30|   1.0   0.9   1.5   1.9   0.9   1.8   4.9   3.8   2.0   1.3   0.6   0.0 |   20.7
   Max 2-Minute >=40|   0.0   0.0   0.1   0.0   0.0   0.1   0.7   0.7   0.1   0.0   0.0   0.0 |    1.6
                    |                                                                         |
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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.