STATION:  SPOKANE FELTS FIELD AIRPORT (KSFF), 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        |  36.9  42.2  50.7  58.6  67.9  75.2  86.9  85.1  74.5  59.9  45.0  36.5 |   59.9
Avg Min Temp        |  26.2  26.6  31.3  35.8  42.8  49.7  55.6  53.9  45.6  36.6  30.7  25.4 |   38.3
Avg Temperature     |  31.6  34.4  41.0  47.2  55.3  62.4  71.2  69.5  60.0  48.2  37.8  30.9 |   49.1
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    59    60    72    80    94    99   104   104    97    86    69    60 |    104
                    |                                                                         |
    Date of Ext-Day |    26    27    20    27    17    29    23    17    03    01    12    27 |
               -Year|  2003  2005  1999  2001  2006  2008  2006  2008  2003  2008  1999  2008 |
                    |                                                                         |
    Extreme Min Temp|   -10     6    17    24    28    37    39    40    26    12     5   -10 |    -10
                    |                                                                         |
    Date of Ext-Day |    05    17    07    04    09    07    04    28    23    31    22    23 |
               -Year|  2004  2006  2002  2001  1999  2002  1999  2000  2000  2002  2003  2008 |
                    |                                                                         |
Heating Degree Days |  1037   863   744   534   310   126    17    22   174   520   816  1056 |   6219
Cooling Degree Days |     0     0     0     0    11    49   210   161    25     0     0     0 |    455
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.8   2.1  12.8   9.9   1.6   0.0   0.0   0.0 |   27.2
    Max Temp >= 75  |   0.0   0.0   0.0   1.4   6.7  15.4  28.6  26.8  14.9   1.5   0.0   0.0 |   95.3
    Max Temp <= 32  |   8.1   1.7   0.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   2.1   7.7 |   20.0
                    |                                                                         |
    Min Temp <= 32  |  25.2  22.6  19.3   8.4   2.6   0.0   0.0   0.0   0.5   9.6  17.8  25.8 |  131.9
    Min Temp <= 20  |   5.8   4.8   0.8   0.0   0.0   0.0   0.0   0.0   0.0   0.5   2.9   7.3 |   22.2
    Min Temp  <= 0  |   0.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5 |    1.0
                    |                                                                         |
Avg Dew Point Temp  |  27.4  27.3  30.6  33.6  39.5  44.9  46.7  45.7  41.2  36.7  32.1  26.6 |   36.0
Avg Wet Bulb Temp   |  30.1  31.5  36.5  41.1  47.6  53.1  57.7  56.4  50.1  42.6  35.4  29.4 |   42.6
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.16 30.13 30.07 30.01 29.98 29.94 29.93 29.93 29.99 30.09 30.16 30.20 |  30.05
(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   |   0.2   0.1   0.7   1.6   2.3   2.1   1.7   2.3   0.6   0.3   0.2   0.4 |   12.5
    Heavy Fog       |   5.6   2.9   1.7   0.8   0.1   0.1   0.0   0.1   0.3   4.1   3.7   3.7 |   23.1
    Fog             |  22.0  16.3  11.2   8.1   6.6   4.5   1.6   1.9   5.3  14.5  17.3  20.0 |  129.2
    Hail            |   0.0   0.0   0.2   0.0   0.0   0.0   0.0   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     |  2.04  1.18  1.40  1.15  1.72  1.31  0.38  0.46  0.62  0.85  2.06  2.53 |  15.69
                    |                                                                         |
Maximum Daily       |  0.87  0.64  0.86  1.14  1.67  1.16  0.81  0.59  0.65  0.65  0.67  0.87 |   1.67
                    |                                                                         |
    Date of Ext-Day |    10    27    27    13    21    10    09    06    30    30    20    03 |
               -Year|  2006  1999  2005  2000  2004  2006  2005  2004  2005  2001  1998  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  16.2  11.0  12.1  10.8  10.4   8.8   3.1   3.9   5.0   9.2  14.1  15.8 |  120.3
    >= 0.10         |   7.4   4.4   5.8   3.3   5.1   4.3   1.2   1.5   2.1   2.5   7.5   8.5 |   53.6
    >= 0.25         |   2.4   1.3   1.2   1.0   1.9   1.5   0.5   0.4   0.6   0.9   2.6   3.3 |   17.7
    >= 0.50         |   0.4   0.2   0.2   0.3   0.9   0.6   0.2   0.2   0.4   0.2   0.5   1.2 |    5.3
    >= 1.00         |   0.0   0.0   0.0   0.2   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0 |    0.4
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.2   4.3   5.8   5.9   5.9   5.8   5.4   4.8   4.3   4.2   4.2   4.0 |    4.9
Daily Avg Max 2-Min |  13.2  13.7  16.9  17.1  17.5  16.7  16.1  15.4  13.8  13.5  13.5  13.3 |   15.1
Daily Avg Peak Gust |  16.4  16.9  21.1  21.6  22.1  21.3  20.9  19.8  17.8  16.7  16.9  16.5 |   19.0
                    |                                                                         |
Maximum Daily Avg   |  18.5  19.1  17.9  18.9  14.7  13.4  14.9  12.6  13.7  15.6  21.9  20.7 |   21.9
                    |                                                                         |
Maximum 2-Minute Avg|    40    45    40    36    44    44    35    39    31    37    40    43 |     45
                    |                                                                         |
Date of Max 2min-Day|    09    02    18    04    12    21    13    02    25    28    19    15 |
               -Year|  2000  1999  2004  2000  2007  2005  2002  2004  1999  2003  2003  2006 |
                    |                                                                         |
Maximum Peak Gust   |    55    53    56    46    55    48    45    46    40    45    53    54 |     56
                    |                                                                         |
Date of Max Gust-Day|    11    02    18    04    19    21    13    18    06    31    19    15 |
               -Year|  2006  1999  2004  2000  2006  2005  2007  2008  2003  1999  2003  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.5   3.1   4.6   3.9   4.9   3.0   2.8   2.8   1.8   2.1   3.6   3.8 |   40.0
   Peak Gust >=40   |   1.0   0.9   1.1   0.4   0.4   0.4   0.6   0.3   0.1   0.3   0.8   0.9 |    7.3
   Peak Gust >=50   |   0.3   0.2   0.1   0.0   0.2   0.0   0.0   0.0   0.0   0.0   0.2   0.2 |    1.2
                    |                                                                         |
   Max 2-Minute >=30|   1.7   0.9   1.4   1.0   0.8   0.5   0.8   0.4   0.1   0.5   0.9   0.0 |    9.0
   Max 2-Minute >=40|   0.2   0.1   0.1   0.0   0.2   0.1   0.0   0.0   0.0   0.0   0.1   0.0 |    0.8
                    |                                                                         |
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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.