STATION:  SPOKANE INTERNATIONAL AIRPORT (KGEG), 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        |  34.5  39.8  48.5  56.7  66.3  73.5  85.2  83.7  73.0  58.0  42.6  33.2 |   57.9
Avg Min Temp        |  24.1  25.7  30.9  35.2  43.2  49.5  56.5  55.2  46.7  36.4  29.2  22.9 |   38.0
Avg Temperature     |  29.3  32.7  39.7  46.0  54.8  61.5  70.9  69.4  59.9  47.2  35.9  28.1 |   47.9
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    56    57    70    81    92    97   103   103    96    86    67    55 |    103
                    |                                                                         |
    Date of Ext-Day |    26    27    20    30    17    29    27    17    01    01    12    14 |
               -Year|  2003  2005  1999  1998  2006  2008  1998  2008  1998  1997  1999  2002 |
                    |                                                                         |
    Extreme Min Temp|   -22     3    12    21    24    35    40    40    22     1    -5   -18 |    -22
                    |                                                                         |
    Date of Ext-Day |    05    17    08    12    08    07    03    28    23    26    22    20 |
               -Year|  2004  2006  2002  1997  2002  2002  1999  2000  2000  2000  2003  2008 |
                    |                                                                         |
Heating Degree Days |  1108   912   783   570   329   149    25    31   188   553   871  1145 |   6665
Cooling Degree Days |     0     0     0     0    12    42   208   169    34     1     0     0 |    467
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.5   1.3  10.0   8.4   1.5   0.0   0.0   0.0 |   21.6
    Max Temp >= 75  |   0.0   0.0   0.0   0.9   5.7  13.4  27.7  26.0  13.7   1.3   0.0   0.0 |   88.7
    Max Temp <= 32  |  11.6   3.2   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   3.8  12.8 |   31.8
                    |                                                                         |
    Min Temp <= 32  |  26.4  24.0  21.1  10.2   2.3   0.0   0.0   0.0   0.5   8.9  19.1  27.5 |  140.0
    Min Temp <= 20  |   8.3   6.3   1.0   0.0   0.0   0.0   0.0   0.0   0.0   1.0   4.0   9.0 |   29.6
    Min Temp  <= 0  |   1.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   0.7 |    1.9
                    |                                                                         |
Avg Dew Point Temp  |  26.1  26.7  29.8  32.1  38.5  43.5  44.5  43.2  39.4  35.0  30.9  25.0 |   34.6
Avg Wet Bulb Temp   |  28.3  30.3  35.4  39.9  46.9  52.1  56.5  55.2  49.4  41.3  33.9  27.2 |   41.4
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.12 30.13 30.06 30.00 29.97 29.94 29.94 29.94 29.97 30.07 30.14 30.20 |  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   0.2   0.7   1.8   2.0   1.8   1.2   0.5   0.1   0.0   0.0 |    8.2
    Heavy Fog       |   9.6   5.8   2.2   0.6   0.5   0.1   0.2   0.2   0.5   2.9   6.7   7.3 |   36.5
    Fog             |  23.7  16.2  12.8   7.4   7.2   4.2   1.5   1.9   3.5  10.6  18.5  21.5 |  129.0
    Hail            |   0.0   0.3   1.1   0.8   0.5   0.1   0.0   0.0   0.0   0.2   0.1   0.2 |    3.3
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.99  1.28  1.43  1.24  1.71  1.13  0.32  0.63  0.55  1.09  2.29  2.58 |  16.24
                    |                                                                         |
Maximum Daily       |  0.94  0.65  0.88  1.23  1.11  0.89  0.72  1.06  0.59  0.98  1.24  1.18 |   1.24
                    |                                                                         |
    Date of Ext-Day |    10    27    27    13    21    04    09    22    30    18    19    03 |
               -Year|  2006  1999  2005  2000  2007  2006  2005  2002  2005  1996  1996  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  15.5  10.5  11.7  10.2  10.5   7.2   3.4   3.6   5.2   8.4  13.5  14.6 |  114.4
    >= 0.10         |   7.0   4.3   5.8   4.0   4.2   3.5   1.0   1.6   1.9   3.2   7.2   7.9 |   51.7
    >= 0.25         |   2.5   1.6   1.2   1.3   2.0   1.5   0.2   0.9   0.6   1.5   3.1   3.6 |   20.2
    >= 0.50         |   0.5   0.2   0.2   0.2   1.0   0.4   0.1   0.2   0.2   0.4   0.7   1.3 |    5.5
    >= 1.00         |   0.0   0.0   0.0   0.1   0.2   0.0   0.0   0.1   0.0   0.0   0.2   0.1 |    0.6
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   8.5   8.2  10.0   9.3   9.2   9.1   8.4   8.0   7.7   8.1   8.1   8.1 |    8.5
Daily Avg Max 2-Min |  17.3  16.6  20.1  19.7  19.8  19.0  18.2  17.9  16.7  17.2  16.8  17.1 |   18.0
Daily Avg Peak Gust |  20.5  19.6  24.1  23.9  24.1  23.3  23.0  22.5  20.6  20.7  20.3  20.1 |   21.9
                    |                                                                         |
Maximum Daily Avg   |  25.0  29.6  23.9  26.7  20.4  19.6  20.7  15.9  20.8  23.1  30.3  27.5 |   30.3
                    |                                                                         |
Maximum 2-Minute Avg|    48    44    46    46    44    62    41    46    38    46    52    69 |     69
                    |                                                                         |
Date of Max 2min-Day|    06    02    14    20    31    21    10    02    25    28    13    12 |
               -Year|  2007  1999  2000  1997  1997  2005  1998  2004  1999  2003  2006  1996 |
                    |                                                                         |
Maximum Peak Gust   |    55    53    55    54    48    77    53    54    47    53    63    69 |     77
                    |                                                                         |
Date of Max Gust-Day|    06    02    16    04    31    21    13    02    25    28    19    12 |
               -Year|  2007  1999  2005  2000  1997  2005  2007  2004  1999  2003  2003  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.4   4.2   7.8   6.9   6.5   5.5   4.6   4.1   3.6   4.8   5.5   5.5 |   64.3
   Peak Gust >=40   |   1.9   1.1   1.8   1.0   0.9   0.4   0.5   0.6   0.2   0.6   1.6   1.9 |   12.4
   Peak Gust >=50   |   0.3   0.2   0.3   0.2   0.0   0.1   0.2   0.2   0.0   0.1   0.2   0.2 |    2.0
                    |                                                                         |
   Max 2-Minute >=30|   3.1   2.4   3.6   2.3   2.6   1.7   0.9   1.1   0.6   1.6   2.6   0.0 |   22.6
   Max 2-Minute >=40|   0.5   0.3   0.5   0.3   0.1   0.1   0.2   0.2   0.0   0.2   0.2   0.0 |    2.6
                    |                                                                         |
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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.