STATION:  PORTLAND INTERNATIONAL AIRPORT (KPDX), OR

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        |  46.6  51.2  55.6  60.9  67.7  73.2  81.1  81.0  75.5  63.0  53.1  46.3 |   62.9
Avg Min Temp        |  36.1  36.6  39.7  42.9  49.1  53.9  58.4  58.6  53.4  46.5  40.7  36.3 |   46.0
Avg Temperature     |  41.4  43.9  47.6  51.9  58.4  63.5  69.8  69.8  64.5  54.8  46.9  41.3 |   54.5
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    66    65    75    90    95   102   104   102    95    83    76    62 |    104
                    |                                                                         |
    Date of Ext-Day |    18    27    29    30    22    26    21    13    27    09    01    25 |
               -Year|  2005  2005  2004  1998  2001  2006  2006  2002  2003  1996  1996  2005 |
                    |                                                                         |
    Extreme Min Temp|    18    22    28    31    37    43    50    48    40    30    24    11 |     11
                    |                                                                         |
    Date of Ext-Day |    06    20    01    02    10    01    05    31    27    31    18    23 |
               -Year|  2004  2006  2002  1997  1999  2000  1996  2008  1999  2006  2000  1998 |
                    |                                                                         |
Heating Degree Days |   732   596   539   394   223    95    12     9    73   319   543   736 |   4272
Cooling Degree Days |     0     0     0     2    18    52   160   157    57     2     0     0 |    447
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.1   0.6   1.8   4.6   4.7   1.3   0.0   0.0   0.0 |   13.1
    Max Temp >= 75  |   0.0   0.0   0.2   2.1   6.7  11.0  24.5  24.0  15.8   2.6   0.1   0.0 |   86.9
    Max Temp <= 32  |   0.6   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.8 |    1.4
                    |                                                                         |
    Min Temp <= 32  |   7.7   7.2   2.2   0.6   0.0   0.0   0.0   0.0   0.0   0.3   3.9   7.5 |   29.3
    Min Temp <= 20  |   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5 |    0.8
    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  |  36.1  36.1  39.6  41.8  46.8  50.6  54.2  54.6  51.1  46.6  41.4  36.3 |   44.6
Avg Wet Bulb Temp   |  39.1  40.4  43.8  46.9  52.0  56.0  60.2  60.4  56.6  50.4  43.4  39.2 |   49.0
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.13 30.15 30.10 30.06 30.06 30.04 30.03 30.02 30.02 30.10 30.12 30.20 |  30.09
(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   0.4   1.0   0.8   0.6   0.7   0.5   0.5   0.4   0.1   0.0 |    5.2
    Heavy Fog       |   4.2   2.9   1.9   0.5   0.1   0.1   0.0   0.1   0.5   3.4   4.2   2.8 |   20.7
    Fog             |  21.4  17.3  15.5  11.0  10.9   7.5   3.5   3.8   8.0  17.7  20.0  20.2 |  157.0
    Hail            |   0.0   0.1   0.2   0.4   0.3   0.1   0.1   0.0   0.2   0.0   0.1   0.0 |    1.5
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  5.59  3.39  3.84  2.41  2.59  1.49  0.45  0.73  1.40  3.06  5.76  6.14 |  36.85
                    |                                                                         |
Maximum Daily       |  2.05  1.28  1.19  0.71  1.45  0.91  0.45  1.05  2.03  1.22  2.69  2.02 |   2.69
                    |                                                                         |
    Date of Ext-Day |    31    27    26    19    31    28    12    29    14    09    19    27 |
               -Year|  2003  1999  2005  1997  1997  2002  2006  2005  1996  2003  1996  1998 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  21.2  17.0  19.8  17.7  16.1  11.0   5.3   5.2   7.4  16.6  19.8  21.1 |  178.3
    >= 0.10         |  13.9   9.8  11.2   8.3   7.9   4.3   1.6   2.0   3.2   8.2  11.6  14.6 |   96.5
    >= 0.25         |   8.2   4.2   5.3   3.2   3.4   2.1   0.7   0.9   1.9   4.3   7.6   8.5 |   50.4
    >= 0.50         |   3.5   1.8   1.6   0.8   1.2   0.5   0.0   0.5   0.6   1.5   3.5   3.8 |   19.4
    >= 1.00         |   0.7   0.2   0.3   0.0   0.1   0.0   0.0   0.1   0.2   0.3   1.0   0.8 |    3.8
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   9.2   8.5   7.3   6.7   6.5   6.8   7.1   6.8   6.1   6.2   7.7   9.4 |    7.4
Daily Avg Max 2-Min |  19.6  19.3  18.0  17.1  16.2  16.5  16.0  15.9  15.5  15.8  17.9  20.4 |   17.4
Daily Avg Peak Gust |  23.6  23.1  21.6  20.6  19.5  20.0  19.4  19.4  18.7  19.1  21.7  24.7 |   20.9
                    |                                                                         |
Maximum Daily Avg   |  24.3  29.9  24.8  18.2  13.8  12.9  11.5  14.1  17.7  20.5  20.6  29.3 |   29.9
                    |                                                                         |
Maximum 2-Minute Avg|    43    43    43    36    33    75    24    26    31    43    43    79 |     79
                    |                                                                         |
Date of Max 2min-Day|    16    10    02    15    09    25    18    26    18    30    23    20 |
               -Year|  2000  2006  1999  1999  2000  2001  1996  1997  1998  2002  1998  2008 |
                    |                                                                         |
Maximum Peak Gust   |    59    52    51    46    40    87    33    33    44    49    53    85 |     87
                    |                                                                         |
Date of Max Gust-Day|    16    10    02    15    09    25    15    26    13    30    15    20 |
               -Year|  2000  2006  1999  1999  2000  2001  2008  1997  2004  2002  2006  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   8.4   6.3   4.8   2.9   1.5   1.1   0.2   0.5   1.5   3.6   5.8   8.6 |   45.2
   Peak Gust >=40   |   1.5   1.7   0.8   0.3   0.1   0.2   0.0   0.0   0.2   0.4   0.5   2.0 |    7.7
   Peak Gust >=50   |   0.1   0.2   0.1   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.2   0.3 |    0.9
                    |                                                                         |
   Max 2-Minute >=30|   2.7   2.8   1.5   0.5   0.2   0.2   0.0   0.0   0.2   1.1   1.3   0.0 |   10.4
   Max 2-Minute >=40|   0.1   0.2   0.1   0.0   0.0   0.1   0.0   0.0   0.0   0.1   0.1   0.0 |    0.7
                    |                                                                         |
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Observations of WEATHER may me innacurate due to early ASOS inconsistancies.  Average days
with Thunderstorms may be low due to 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.