STATION:  RENTON MUNICIPAL AIRPORT (KRNT), WA

CLIMATOLOGICAL SUMMARY.  Period of Record: Oct 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        |  47.9  50.5  53.9  59.2  65.2  70.8  76.9  76.7  70.8  60.9  52.2  46.9 |   61.0
Avg Min Temp        |  37.1  36.4  39.9  42.8  48.5  53.4  57.5  57.3  52.3  46.3  40.2  36.7 |   45.7
Avg Temperature     |  42.5  43.4  46.9  51.0  56.9  62.1  67.2  67.0  61.6  53.6  46.2  41.8 |   53.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    64    63    78    83    91    94    97    92    90    77    65    62 |     97
                    |                                                                         |
    Date of Ext-Day |    19    12    29    16    17    13    21    13    13    06    01    14 |
               -Year|  2005  2004  2004  1999  2008  2002  2006  2002  1999  2000  2008  2002 |
                    |                                                                         |
    Extreme Min Temp|    18    19    29    31    37    44    49    47    40    28    18    15 |     15
                    |                                                                         |
    Date of Ext-Day |    14    18    06    03    10    08    05    24    23    31    29    20 |
               -Year|  2007  2006  1999  2007  1999  2002  2000  2003  2000  2003  2006  1998 |
                    |                                                                         |
Heating Degree Days |   698   609   561   420   260   119    25    21   122   353   564   720 |   4471
Cooling Degree Days |     0     0     0     0     7    32    93    84    19     0     0     0 |    235
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.2   0.6   1.2   0.4   0.2   0.0   0.0   0.0 |    2.6
    Max Temp >= 75  |   0.0   0.0   0.1   0.9   3.5   8.2  18.7  19.4   9.3   0.3   0.0   0.0 |   60.4
    Max Temp <= 32  |   0.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.8 |    1.3
                    |                                                                         |
    Min Temp <= 32  |   6.2   7.9   2.4   0.4   0.0   0.0   0.0   0.0   0.0   0.7   4.5   6.7 |   28.8
    Min Temp <= 20  |   0.5   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   0.7 |    1.6
    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  |  36.7  35.3  37.8  40.1  44.9  48.9  52.6  53.7  50.5  46.1  40.3  35.9 |   43.6
Avg Wet Bulb Temp   |  39.8  39.8  42.5  45.6  50.4  54.7  58.7  59.2  55.3  49.6  43.3  39.3 |   48.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.12 30.14 30.10 30.06 30.08 30.06 30.05 30.03 30.05 30.12 30.13 30.15 |  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   |   0.3   0.1   0.4   1.3   1.5   1.0   1.4   1.5   0.5   0.3   0.1   0.1 |    8.5
    Heavy Fog       |   3.4   1.9   0.9   0.3   0.1   0.0   0.0   0.1   0.5   3.0   2.4   3.5 |   16.1
    Fog             |  19.8  14.4  13.8  10.0   9.0   7.9   4.4   5.1   8.3  17.4  17.2  18.9 |  146.2
    Hail            |   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
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  5.73  3.13  3.58  2.28  1.94  1.64  0.67  1.14  1.39  3.18  6.66  5.31 |  36.65
                    |                                                                         |
Maximum Daily       |  2.12  1.32  1.41  1.36  0.71  1.21  0.70  1.02  1.00  4.48  3.16  1.66 |   4.48
                    |                                                                         |
    Date of Ext-Day |    17    01    26    13    09    11    07    24    30    20    25    13 |
               -Year|  2005  2000  2005  2002  2005  2001  2002  2008  2007  2003  1998  2001 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  20.3  15.3  18.3  14.2  12.8  10.0   5.7   5.4   8.4  14.3  18.2  19.2 |  162.1
    >= 0.10         |  13.6   8.0  10.3   7.3   6.4   4.5   2.1   3.0   4.2   7.7  12.5  13.4 |   93.0
    >= 0.25         |   7.7   4.6   4.9   2.7   2.6   1.9   1.1   1.6   2.0   4.4   8.6   7.2 |   49.3
    >= 0.50         |   4.1   1.5   1.8   0.9   0.8   0.9   0.1   0.8   0.7   1.1   3.9   2.8 |   19.5
    >= 1.00         |   0.7   0.3   0.3   0.1   0.0   0.2   0.0   0.1   0.1   0.5   1.5   0.7 |    4.5
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.6   5.8   6.4   6.2   6.2   6.3   6.2   5.8   5.1   5.0   5.1   5.4 |    5.8
Daily Avg Max 2-Min |  14.0  14.7  15.4  14.9  14.2  13.7  13.6  13.2  12.8  13.1  13.6  14.5 |   14.0
Daily Avg Peak Gust |  18.6  19.4  20.5  19.1  18.2  17.4  16.4  16.0  15.9  16.6  17.8  19.5 |   18.0
                    |                                                                         |
Maximum Daily Avg   |  15.0  16.6  18.9  13.7  13.8  15.1  14.0  12.4  15.6  15.1  14.7  17.8 |   18.9
                    |                                                                         |
Maximum 2-Minute Avg|    37    36    38    29    28    25    26    21    25    31    30    39 |     39
                    |                                                                         |
Date of Max 2min-Day|    16    06    03    04    01    05    07    06    25    27    24    15 |
               -Year|  2000  1999  1999  1999  1999  1999  1999  1999  1999  1999  1998  2006 |
                    |                                                                         |
Maximum Peak Gust   |    53    49    53    38    39    38    38    32    40    48    43    51 |     53
                    |                                                                         |
Date of Max Gust-Day|    16    06    29    04    06    09    07    29    13    27    04    27 |
               -Year|  2000  1999  1999  1999  1999  2008  1999  1999  2004  1999  2006  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.0   3.3   3.9   2.1   1.1   0.7   0.3   0.1   0.6   1.6   2.6   4.9 |   24.3
   Peak Gust >=40   |   0.3   0.9   0.6   0.0   0.0   0.0   0.0   0.0   0.1   0.3   0.4   0.9 |    3.5
   Peak Gust >=50   |   0.1   0.0   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2 |    0.5
                    |                                                                         |
   Max 2-Minute >=30|   0.2   0.6   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.1   0.0 |    1.2
   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.