STATION:  DEER PARK AIRPORT (KDEW), WA

CLIMATOLOGICAL SUMMARY.  Period of Record: Nov 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        |  33.6  39.1  48.0  57.3  66.0  72.9  85.0  84.1  73.3  57.9  42.6  33.1 |   57.8
Avg Min Temp        |  21.8  21.8  27.1  31.5  38.2  44.0  47.5  46.5  38.3  30.4  26.8  20.8 |   32.9
Avg Temperature     |  27.7  30.4  37.6  44.4  52.1  58.5  66.2  65.3  55.8  44.2  34.7  27.0 |   45.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    54    58    69    78    91    96   102   103    95    82    64    57 |    103
                    |                                                                         |
    Date of Ext-Day |    26    27    20    25    16    29    12    17    03    04    12    28 |
               -Year|  2003  2005  1999  2005  2006  2008  2002  2008  2006  2003  1999  2008 |
                    |                                                                         |
    Extreme Min Temp|   -28    -4     1    13    20    31    32    32    18     0    -7   -17 |    -28
                    |                                                                         |
    Date of Ext-Day |    05    08    02    01    01    10    31    20    23    31    22    20 |
               -Year|  2004  2001  2007  2008  2008  1999  2006  2000  2000  2002  2003  2008 |
                    |                                                                         |
Heating Degree Days |  1157   976   850   618   405   216    58    72   283   646   909  1179 |   7369
Cooling Degree Days |     0     0     0     0     5    21    97    81     8     0     0     0 |    211
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   1.4  10.0   8.1   1.3   0.0   0.0   0.0 |   21.1
    Max Temp >= 75  |   0.0   0.0   0.0   1.0   5.4  12.5  27.6  26.3  14.0   1.0   0.0   0.0 |   87.7
    Max Temp <= 32  |  12.7   3.0   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   3.3  12.3 |   31.6
                    |                                                                         |
    Min Temp <= 32  |  27.9  26.0  25.6  17.9   7.6   0.5   0.2   0.2   5.6  19.1  21.6  28.7 |  180.9
    Min Temp <= 20  |  10.5  11.6   3.5   0.8   0.1   0.0   0.0   0.0   0.1   2.6   6.7  12.1 |   47.9
    Min Temp  <= 0  |   1.9   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.2   1.6 |    4.0
                    |                                                                         |
Avg Dew Point Temp  |  25.2  25.2  28.9  32.2  38.6  44.7  44.8  42.9  38.4  33.5  30.1  24.4 |   34.1
Avg Wet Bulb Temp   |  27.2  28.7  34.0  39.3  45.8  51.6  54.8  53.3  47.0  39.4  33.0  26.7 |   40.1
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.16 30.14 30.08 30.01 29.99 29.96 29.94 29.94 29.99 30.10 30.18 30.20 |  30.06
(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   0.0   0.3   0.9   2.7   2.6   2.2   1.5   0.5   0.2   0.0   0.0 |   10.9
    Heavy Fog       |   8.6   5.9   3.6   1.3   1.1   1.1   0.2   0.7   1.1   4.3   5.1   6.3 |   39.3
    Fog             |  23.4  15.8  13.2  10.2   9.2   7.7   3.0   3.0   5.2  15.1  17.4  19.2 |  142.3
    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     |  3.12  1.81  1.95  1.59  1.64  1.74  0.39  0.67  0.75  1.36  3.00  3.56 |  21.57
                    |                                                                         |
Maximum Daily       |  2.01  1.17  1.15  1.24  0.90  1.72  0.92  1.28  1.04  0.91  0.90  1.35 |   2.01
                    |                                                                         |
    Date of Ext-Day |    10    01    27    13    14    25    09    24    08    16    10    03 |
               -Year|  2006  2000  2005  2000  2001  1999  2005  2004  2003  2006  2006  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  17.1  11.1  13.3  11.4  12.1   9.7   4.1   4.5   4.7   7.8  14.6  15.5 |  126.1
    >= 0.10         |   8.4   5.5   6.1   5.0   5.3   4.6   1.0   1.7   2.4   3.8   9.4   9.7 |   62.9
    >= 0.25         |   3.9   2.3   2.8   1.9   2.6   2.0   0.4   1.0   0.8   2.0   4.6   5.2 |   29.5
    >= 0.50         |   1.4   0.6   1.1   0.5   0.4   0.8   0.1   0.3   0.3   0.8   1.3   2.2 |    9.8
    >= 1.00         |   0.2   0.3   0.1   0.2   0.0   0.2   0.0   0.1   0.1   0.0   0.0   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|   5.1   5.3   6.3   6.5   6.6   6.3   5.8   5.5   5.0   5.1   5.2   5.0 |    5.6
Daily Avg Max 2-Min |  13.8  14.1  17.3  18.3  18.5  17.0  16.7  15.9  14.8  14.3  13.7  13.4 |   15.6
Daily Avg Peak Gust |  16.6  17.0  21.3  23.3  23.3  21.6  21.5  20.9  19.0  17.7  16.8  16.4 |   19.6
                    |                                                                         |
Maximum Daily Avg   |  18.0  18.0  18.0  20.7  17.1  14.8  15.0  13.0  15.7  17.3  21.2  19.1 |   21.2
                    |                                                                         |
Maximum 2-Minute Avg|    41    40    47    45    54    38    64    38    33    35    43    43 |     64
                    |                                                                         |
Date of Max 2min-Day|    06    02    26    07    24    21    17    18    08    31    19    15 |
               -Year|  2007  1999  2008  2008  2003  2005  2008  2008  2000  1999  2003  2006 |
                    |                                                                         |
Maximum Peak Gust   |    54    46    62    90    56    47    85    45    45    43    55    55 |     90
                    |                                                                         |
Date of Max Gust-Day|    06    02    26    07    24    21    17    12    08    31    19    15 |
               -Year|  2007  1999  2008  2008  2003  2005  2008  2005  2000  1999  2003  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.4   2.4   5.3   5.8   6.3   3.0   3.0   3.0   2.4   1.8   2.6   2.6 |   40.6
   Peak Gust >=40   |   0.7   0.5   1.2   1.7   1.0   0.5   0.8   0.3   0.1   0.3   0.5   0.4 |    8.1
   Peak Gust >=50   |   0.1   0.0   0.1   0.3   0.1   0.0   0.4   0.0   0.0   0.0   0.1   0.2 |    1.3
                    |                                                                         |
   Max 2-Minute >=30|   0.8   0.9   1.7   1.5   1.5   0.4   0.8   0.5   0.2   0.6   1.0   0.0 |   10.0
   Max 2-Minute >=40|   0.1   0.1   0.1   0.2   0.2   0.0   0.3   0.0   0.0   0.0   0.1   0.0 |    1.1
                    |                                                                         |
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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.