STATION:  LEWISTON-NEZ PERCE COUNTY AIRPORT (KLWS), ID

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        |  42.0  47.2  54.7  61.5  71.0  78.5  91.3  89.6  78.5  62.4  48.7  40.5 |   63.8
Avg Min Temp        |  30.2  31.7  35.6  39.7  47.4  53.3  60.9  59.6  51.4  41.2  34.5  29.4 |   42.9
Avg Temperature     |  36.1  39.4  45.2  50.6  59.2  65.9  76.1  74.6  64.9  51.8  41.6  34.9 |   53.4
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    60    64    78    84    97   105   110   108   105    88    77    65 |    110
                    |                                                                         |
    Date of Ext-Day |    26    17    29    30    17    29    13    05    12    01    12    14 |
               -Year|  2003  2007  2004  1998  2006  2008  2002  1998  2000  2008  1999  2002 |
                    |                                                                         |
    Extreme Min Temp|    -5     6    20    26    33    38    45    45    31    15    15     2 |     -5
                    |                                                                         |
    Date of Ext-Day |    05    18    08    01    10    09    03    31    23    31    05    21 |
               -Year|  2004  2006  2002  2008  1999  1999  1999  2006  2000  2002  2003  1998 |
                    |                                                                         |
Heating Degree Days |   896   722   615   432   209    68     4     5    87   412   702   932 |   5082
Cooling Degree Days |     0     0     0     0    30    93   346   301    84     3     0     0 |    858
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   1.2   4.4  18.7  16.5   4.0   0.0   0.0   0.0 |   44.8
    Max Temp >= 75  |   0.0   0.0   0.3   2.9  10.8  19.6  29.8  29.5  19.4   2.9   0.1   0.0 |  115.3
    Max Temp <= 32  |   4.1   0.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.9   4.7 |   10.2
                    |                                                                         |
    Min Temp <= 32  |  18.0  15.2   9.4   2.8   0.0   0.0   0.0   0.0   0.1   2.7  12.0  19.8 |   80.1
    Min Temp <= 20  |   3.2   1.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.3   1.1   3.9 |    9.7
    Min Temp  <= 0  |   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.2
                    |                                                                         |
Avg Dew Point Temp  |  28.7  29.5  32.4  36.2  42.1  46.1  46.5  44.3  41.2  37.4  33.2  28.2 |   37.2
Avg Wet Bulb Temp   |  33.2  35.2  39.5  43.9  50.4  55.2  59.5  57.9  52.4  44.7  38.0  32.4 |   45.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.14 30.14 30.06 30.01 29.98 29.94 29.92 29.92 29.97 30.08 30.14 30.21 |  30.04
(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   0.5   0.7   0.9   1.1   0.7   0.5   0.2   0.0   0.0 |    4.5
    Heavy Fog       |   5.4   2.1   1.0   0.2   0.1   0.2   0.1   0.1   0.4   1.6   3.2   4.7 |   19.1
    Fog             |  12.5   8.0   5.7   5.8   4.8   3.6   0.8   1.4   2.5   6.5  11.8  12.5 |   75.9
    Hail            |   0.0   0.0   0.0   0.0   0.2   0.0   0.1   0.0   0.0   0.0   0.0   0.0 |    0.2
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.14  0.78  1.08  1.40  1.71  1.05  0.45  0.48  0.81  1.00  1.33  1.13 |  12.36
                    |                                                                         |
Maximum Daily       |  0.77  0.72  0.88  0.98  1.15  0.67  1.80  0.98  0.97  0.87  1.22  0.60 |   1.80
                    |                                                                         |
    Date of Ext-Day |    31    14    07    26    22    04    10    22    22    28    18    26 |
               -Year|  1997  2000  2003  2006  1998  2006  1998  2004  2006  1999  1996  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  11.5   9.0  11.6  11.3  11.2   8.0   3.3   3.4   5.1   8.4  10.9  11.7 |  105.6
    >= 0.10         |   3.3   2.5   2.8   4.0   5.8   3.1   0.9   1.3   2.5   3.2   4.3   4.1 |   37.8
    >= 0.25         |   1.3   0.8   0.9   1.8   2.2   1.8   0.4   0.5   1.0   1.3   1.5   0.9 |   14.4
    >= 0.50         |   0.3   0.1   0.2   0.2   0.5   0.2   0.2   0.2   0.5   0.2   0.4   0.2 |    3.1
    >= 1.00         |   0.0   0.0   0.0   0.0   0.1   0.0   0.1   0.0   0.0   0.0   0.1   0.0 |    0.2
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   6.4   5.9   6.2   5.9   5.5   5.5   5.4   5.3   4.7   4.6   5.1   6.1 |    5.6
Daily Avg Max 2-Min |  16.9  15.6  17.6  16.8  16.7  16.4  16.1  15.9  14.1  14.2  15.0  16.9 |   16.0
Daily Avg Peak Gust |  20.5  19.0  21.6  20.9  20.8  20.8  20.4  19.9  17.4  17.3  18.3  20.4 |   19.8
                    |                                                                         |
Maximum Daily Avg   |  20.7  21.3  17.7  15.7  14.7  12.9  15.0  13.7  18.2  18.4  20.2  22.9 |   22.9
                    |                                                                         |
Maximum 2-Minute Avg|    45    45    44    45    45    43    46    36    38    49    39    46 |     49
                    |                                                                         |
Date of Max 2min-Day|    01    02    30    27    19    01    10    24    08    22    13    15 |
               -Year|  1997  1999  1997  2004  2006  2001  1998  1999  2000  2001  2006  2000 |
                    |                                                                         |
Maximum Peak Gust   |    60    56    55    54    52    53    63    52    47    58    48    59 |     63
                    |                                                                         |
Date of Max Gust-Day|    09    02    05    14    19    01    10    31    08    22    13    15 |
               -Year|  2000  1999  2004  2002  2006  2001  1998  2007  2000  2001  2006  2000 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   6.1   3.4   5.9   4.2   3.8   3.5   3.6   4.1   2.3   3.6   4.0   5.8 |   50.4
   Peak Gust >=40   |   1.3   0.6   1.6   0.8   0.7   0.6   0.6   0.5   0.5   0.9   0.9   1.5 |   10.3
   Peak Gust >=50   |   0.2   0.2   0.3   0.2   0.1   0.2   0.1   0.1   0.0   0.3   0.0   0.2 |    1.8
                    |                                                                         |
   Max 2-Minute >=30|   2.6   1.5   2.8   1.2   1.3   0.8   1.2   0.9   0.9   1.2   1.4   0.0 |   15.8
   Max 2-Minute >=40|   0.3   0.2   0.4   0.2   0.1   0.2   0.1   0.0   0.0   0.3   0.0   0.0 |    1.6
                    |                                                                         |
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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.