STATION:  OLYMPIA AIRPORT (KOLM), 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        |  45.7  49.3  53.1  58.6  65.0  70.2  77.4  77.6  71.5  59.7  50.8  44.9 |   60.3
Avg Min Temp        |  33.1  31.9  34.9  36.6  42.5  47.0  50.3  49.8  44.9  40.3  36.0  33.0 |   40.0
Avg Temperature     |  39.4  40.6  44.0  47.6  53.7  58.6  63.9  63.7  58.2  50.0  43.4  38.9 |   50.2
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    64    65    79    84    92    94   101    94    92    81    73    60 |    101
                    |                                                                         |
    Date of Ext-Day |    19    24    29    30    27    13    21    10    04    09    07    24 |
               -Year|  2005  2005  2004  1998  2005  2002  2006  1996  2003  1996  2002  2005 |
                    |                                                                         |
    Extreme Min Temp|    10    13    21    23    26    36    38    38    26    14    17    -1 |     -1
                    |                                                                         |
    Date of Ext-Day |    04    19    04    02    07    12    02    24    23    31    05    22 |
               -Year|  2004  2006  2001  2008  2002  2008  2003  2003  2000  2002  2003  1998 |
                    |                                                                         |
Heating Degree Days |   792   689   652   522   351   204    80    74   208   465   648   808 |   5493
Cooling Degree Days |     0     0     0     0     2    12    45    33     4     0     0     0 |     96
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   0.8   2.3   1.5   0.3   0.0   0.0   0.0 |    5.2
    Max Temp >= 75  |   0.0   0.0   0.1   1.4   3.9   7.6  18.9  18.7   9.7   0.3   0.0   0.0 |   60.6
    Max Temp <= 32  |   0.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.9 |    1.3
                    |                                                                         |
    Min Temp <= 32  |  12.4  14.7  11.4   7.2   1.7   0.0   0.0   0.0   0.4   4.4   9.9  14.1 |   76.1
    Min Temp <= 20  |   2.2   1.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   1.0   0.9 |    5.5
    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   0.1 |    0.1
                    |                                                                         |
Avg Dew Point Temp  |  36.6  35.8  38.1  39.5  44.5  48.5  52.0  52.9  49.2  44.5  40.0  36.3 |   43.2
Avg Wet Bulb Temp   |  38.5  38.5  41.4  43.7  49.1  53.2  57.1  57.2  53.1  47.1  41.2  37.9 |   46.5
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.11 30.15 30.09 30.06 30.06 30.05 30.05 30.03 30.03 30.10 30.11 30.17 |  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   |   0.6   0.3   0.3   0.3   0.3   0.3   0.3   0.5   0.7   0.5   0.3   0.5 |    5.1
    Heavy Fog       |  10.0   9.2   6.1   4.9   2.5   1.7   1.3   4.0   8.0  10.6  10.7  10.2 |   79.1
    Fog             |  26.9  23.5  23.8  19.3  15.6  12.6  11.0  15.1  19.0  24.4  24.0  24.8 |  239.9
    Hail            |   0.1   0.0   0.1   0.2   0.3   0.0   0.0   0.0   0.0   0.0   0.1   0.1 |    0.7
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  8.95  4.81  5.89  2.75  1.96  1.71  0.53  1.06  1.46  4.52  8.74  8.38 |  50.76
                    |                                                                         |
Maximum Daily       |  2.47  1.98  2.01  1.58  0.94  1.01  0.82  1.24  1.14  4.12  4.31  3.19 |   4.31
                    |                                                                         |
    Date of Ext-Day |    24    24    26    19    31    28    08    22    29    20    06    03 |
               -Year|  2002  1999  2005  1997  1997  2002  1997  2001  2005  2003  2006  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  23.7  18.1  21.2  15.9  12.2  10.1   4.7   6.8  10.7  19.0  21.6  22.2 |  186.3
    >= 0.10         |  16.3  11.1  13.0   8.5   6.0   4.7   1.5   2.5   3.8   9.6  13.7  14.1 |  104.9
    >= 0.25         |  11.1   6.7   8.3   3.4   2.4   2.5   0.8   1.2   1.9   5.3   9.7  10.3 |   63.5
    >= 0.50         |   6.3   3.1   3.2   1.0   1.0   1.0   0.2   0.7   0.8   3.0   6.0   5.3 |   31.4
    >= 1.00         |   2.3   0.8   1.2   0.2   0.0   0.1   0.0   0.1   0.1   0.7   2.3   2.2 |    9.8
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   6.0   5.5   6.6   5.8   5.7   5.8   5.1   4.8   4.5   5.1   5.6   6.0 |    5.5
Daily Avg Max 2-Min |  15.4  15.1  16.7  15.8  14.7  14.5  13.4  13.2  13.0  14.0  14.8  15.6 |   14.7
Daily Avg Peak Gust |  19.4  19.1  21.2  19.9  18.7  18.4  17.1  16.9  16.6  17.7  18.7  19.7 |   18.6
                    |                                                                         |
Maximum Daily Avg   |  18.6  16.7  17.4  13.7  13.1  12.6  12.2  11.1  14.1  20.9  18.6  19.2 |   20.9
                    |                                                                         |
Maximum 2-Minute Avg|    39    36    38    33    26    26    28    22    29    33    35    40 |     40
                    |                                                                         |
Date of Max 2min-Day|    16    05    03    29    02    15    13    02    17    09    12    15 |
               -Year|  2000  1999  1999  2001  2007  1998  1999  1996  1997  1997  2007  2006 |
                    |                                                                         |
Maximum Peak Gust   |    54    47    49    46    36    36    32    30    34    45    47    56 |     56
                    |                                                                         |
Date of Max Gust-Day|    16    05    20    29    02    09    13    06    14    09    24    15 |
               -Year|  2000  1999  2005  2001  2007  2008  1999  2004  1997  1997  1998  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   4.9   3.9   4.2   2.3   0.6   0.5   0.1   0.1   0.6   2.7   4.6   5.7 |   30.3
   Peak Gust >=40   |   0.9   0.8   0.6   0.2   0.0   0.0   0.0   0.0   0.0   0.3   0.5   1.2 |    4.5
   Peak Gust >=50   |   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
                    |                                                                         |
   Max 2-Minute >=30|   1.1   1.0   1.0   0.2   0.0   0.0   0.0   0.0   0.0   0.5   0.9   0.0 |    4.6
   Max 2-Minute >=40|   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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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.