STATION:  WHIDBEY ISLAND NAS (KNUW), WA

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        |  44.7  48.5  51.0  54.3  59.6  62.0  66.1  67.1  62.7  57.0  51.4  44.7 |   55.8
Avg Min Temp        |  34.5  36.2  38.5  40.4  45.6  48.9  51.3  51.6  47.9  43.1  38.9  34.2 |   42.6
Avg Temperature     |  39.6  42.4  44.7  47.3  52.6  55.5  58.7  59.4  55.3  50.0  45.1  39.5 |   49.2
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    55    59    66    72    80    74    81    76    77    69    64    60 |     81
                    |                                                                         |
    Date of Ext-Day |    23    29    06    26    17    28    11    10    10    02    01    03 |
               -Year|  2007  2008  2007  1997  2008  2007  2007  1997  1997  2008  2008  2007 |
                    |                                                                         |
    Extreme Min Temp|    17    26    24    28    33    43    43    45    33    31    14     8 |      8
                    |                                                                         |
    Date of Ext-Day |    12    05    01    01    15    19    11    31    29    11    23    20 |
               -Year|  2007  1997  2007  2008  2007  2008  2008  2008  2008  2008  2007  2008 |
                    |                                                                         |
Heating Degree Days |   787   639   628   530   383   286   197   175   291   464   596   792 |   5767
Cooling Degree Days |     0     0     0     0     0     0     2     0     0     0     0     0 |      2
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   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
    Max Temp >= 75  |   0.0   0.0   0.0   0.0   0.3   0.0   1.3   2.2   0.3   0.0   0.0   0.0 |    4.1
    Max Temp <= 32  |   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.3 |    2.3
                    |                                                                         |
    Min Temp <= 32  |   9.5   8.4   3.0   2.4   0.0   0.0   0.0   0.0   0.0   1.4   6.1   9.8 |   40.6
    Min Temp <= 20  |   2.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5   1.3 |    4.1
    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  |  34.0  37.1  37.9  39.8  45.6  48.3  51.8  52.6  50.0  44.1  38.9  33.9 |   42.8
Avg Wet Bulb Temp   |  37.4  40.2  41.6  43.8  49.0  51.3  54.5  55.2  52.3  47.0  42.7  37.4 |   46.0
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.09 30.10 30.15 30.09 30.08 30.05 30.06 30.01 30.05 30.14 30.08 30.13 |  30.08
(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   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Heavy Fog       |   2.3   1.7   0.7   0.0   3.0   0.7   1.0   2.2   2.8   1.7   1.8   1.0 |   18.8
    Fog             |  13.7  13.0  11.5   6.4  10.3   8.0   5.8   9.0  10.6   8.3  10.5   9.4 |  116.5
    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     |  2.73  1.94  2.45  1.27  1.38  1.73  0.72  0.69  1.27  2.08  2.50  2.09 |  20.85
                    |                                                                         |
Maximum Daily       |  0.94  1.11  0.48  0.46  0.94  0.80  0.42  0.38  0.58  0.75  1.21  0.84 |   1.21
                    |                                                                         |
    Date of Ext-Day |    02    14    24    26    31    03    18    24    03    30    27    29 |
               -Year|  2007  1997  2007  1997  1997  2008  2007  2008  1996  1997  1996  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  17.7  16.9  20.2  14.5  12.3  13.3   8.1  10.2  14.4  20.3  18.8  18.2 |  185.0
    >= 0.10         |   9.0   5.7   8.4   3.4   3.7   5.3   2.5   2.5   4.3   7.3   8.2   7.5 |   67.9
    >= 0.25         |   3.3   2.0   2.7   2.0   1.7   2.0   1.0   0.5   1.8   2.0   2.2   2.1 |   23.3
    >= 0.50         |   1.0   0.7   0.0   0.0   0.3   0.3   0.0   0.0   0.3   0.3   1.0   0.2 |    4.1
    >= 1.00         |   0.0   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5   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|  10.7   8.6  11.1   8.9   7.4   7.1   6.5   5.8   5.8   8.4   8.8  11.3 |    8.4
Daily Avg Max 2-Min |  23.6  20.8  24.6  20.0  17.1  16.3  15.4  15.4  15.5  22.0  22.3  25.3 |   19.9
Daily Avg Peak Gust |  29.8  26.2  30.7  25.0  21.7  21.2  19.4  19.9  19.6  28.9  28.8  31.6 |   25.2
                    |                                                                         |
Maximum Daily Avg   |  27.4  24.1  26.7  23.6  19.1  14.7  16.3  13.1  22.2  24.7  26.7  29.1 |   29.1
                    |                                                                         |
Maximum 2-Minute Avg|    48    47    47    41    31    32    36    32    39    40    51    58 |     58
                    |                                                                         |
Date of Max 2min-Day|    05    05    30    20    08    09    22    25    29    01    12    15 |
               -Year|  2007  2008  1997  1997  2007  2008  2007  2007  2007  1997  2007  2006 |
                    |                                                                         |
Maximum Peak Gust   |    62    72    60    52    40    40    49    53    55    59    70    69 |     72
                    |                                                                         |
Date of Max Gust-Day|    09    24    30    13    08    09    22    25    30    28    12    15 |
               -Year|  2007  2008  1997  2007  2007  2008  2007  2007  2008  2008  2007  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |  15.3  11.4  16.0   9.4   5.3   4.7   2.9   5.6   5.1  15.5  14.2  16.3 |  121.7
   Peak Gust >=40   |   7.8   4.5   7.7   2.8   0.4   0.3   0.5   1.4   2.2   7.0   7.5   8.8 |   50.8
   Peak Gust >=50   |   3.1   1.4   1.4   0.3   0.0   0.0   0.0   0.3   0.3   1.9   1.9   2.4 |   13.0
                    |                                                                         |
   Max 2-Minute >=30|  10.6   6.5  10.1   3.8   1.8   0.3   0.5   0.8   3.0   7.8   8.1   0.0 |   53.3
   Max 2-Minute >=40|   3.1   1.0   1.7   0.7   0.0   0.0   0.0   0.0   0.0   0.8   0.6   0.0 |    7.9
                    |                                                                         |
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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.