STATION:  MOSES LAKE GRANT COUNTY INTL AIRPORT (KMWH), WA

CLIMATOLOGICAL SUMMARY.  Period of Record: Jul 1997 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        |  36.8  44.8  55.4  63.4  72.7  80.4  90.2  88.2  78.5  62.9  46.9  36.2 |   63.0
Avg Min Temp        |  24.1  27.6  32.1  36.2  45.0  51.6  57.8  56.0  47.0  36.7  29.4  24.2 |   39.0
Avg Temperature     |  30.5  36.2  43.7  49.8  58.8  66.0  74.0  72.1  62.7  49.8  38.1  30.2 |   51.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    58    63    75    89    97   103   108   106   100    86    69    68 |    108
                    |                                                                         |
    Date of Ext-Day |    03    27    20    30    23    29    13    04    02    04    06    28 |
               -Year|  1999  2005  1999  1998  2001  2008  2002  1998  1998  2003  2006  1998 |
                    |                                                                         |
    Extreme Min Temp|   -17     4    19    22    27    37    42    42    27     5    -1    -4 |    -17
                    |                                                                         |
    Date of Ext-Day |    05    18    08    04    08    09    03    31    23    31    29    20 |
               -Year|  2004  2006  2002  2003  2002  1999  1999  2006  2000  2002  2006  2008 |
                    |                                                                         |
Heating Degree Days |  1070   814   659   456   217    61     6     8   113   473   804  1078 |   5760
Cooling Degree Days |     0     0     0     1    26    90   286   229    46     1     0     0 |    677
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   1.6   4.9  17.2  13.9   2.8   0.0   0.0   0.0 |   40.4
    Max Temp >= 75  |   0.0   0.0   0.1   2.4  12.1  22.6  30.6  29.6  20.2   1.9   0.0   0.0 |  119.5
    Max Temp <= 32  |   9.2   0.8   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.7   9.7 |   21.4
                    |                                                                         |
    Min Temp <= 32  |  27.2  22.8  18.1   7.6   1.4   0.0   0.0   0.0   0.3   9.8  18.8  26.7 |  132.7
    Min Temp <= 20  |   8.2   2.8   0.5   0.0   0.0   0.0   0.0   0.0   0.0   0.8   4.4   8.9 |   25.5
    Min Temp  <= 0  |   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.3 |    1.4
                    |                                                                         |
Avg Dew Point Temp  |  26.3  28.8  31.1  33.2  39.0  44.4  48.0  47.9  41.8  35.4  31.7  26.3 |   36.2
Avg Wet Bulb Temp   |  28.9  33.0  38.2  42.7  49.3  54.9  59.8  58.8  51.9  43.0  35.3  28.9 |   43.7
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.15 30.13 30.08 30.01 29.97 29.93 29.91 29.92 29.96 30.09 30.16 30.22 |  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   |   0.1   0.0   0.7   0.3   0.7   0.8   0.8   0.8   0.2   0.0   0.0   0.1 |    4.5
    Heavy Fog       |   8.8   3.2   1.6   0.0   0.0   0.0   0.0   0.1   0.2   0.6   4.3   6.6 |   25.3
    Fog             |  18.8  10.5   5.3   2.6   2.6   2.1   0.6   0.8   1.1   5.5  12.5  17.0 |   79.5
    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     |  1.05  0.63  0.57  0.61  0.61  0.63  0.17  0.19  0.21  0.48  0.87  1.10 |   7.12
                    |                                                                         |
Maximum Daily       |  0.59  0.44  0.43  1.10  0.85  0.52  0.60  0.37  0.43  0.65  0.66  0.55 |   1.10
                    |                                                                         |
    Date of Ext-Day |    23    28    27    13    09    05    31    24    04    17    05    30 |
               -Year|  2003  2006  2007  2000  2005  2005  1998  2004  2000  2004  1998  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  10.7   7.0   5.8   5.8   6.4   4.3   1.8   2.3   2.4   6.0   9.6  10.8 |   72.9
    >= 0.10         |   4.0   2.3   2.1   1.7   2.0   2.0   0.6   0.6   0.8   1.5   3.1   4.2 |   24.8
    >= 0.25         |   1.3   0.8   0.5   0.5   0.6   1.1   0.1   0.2   0.2   0.5   0.7   0.9 |    7.3
    >= 0.50         |   0.1   0.0   0.0   0.3   0.1   0.1   0.1   0.0   0.0   0.1   0.1   0.2 |    1.0
    >= 1.00         |   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   6.3   6.9   8.0   8.0   8.3   8.4   7.6   7.0   6.8   6.8   6.3   5.9 |    7.2
Daily Avg Max 2-Min |  14.4  15.3  18.6  18.5  19.4  19.1  17.1  16.4  15.8  15.7  14.4  14.0 |   16.5
Daily Avg Peak Gust |  17.0  18.3  22.5  22.8  23.9  23.6  21.3  20.0  19.3  19.1  17.2  16.6 |   20.1
                    |                                                                         |
Maximum Daily Avg   |  20.6  20.6  21.1  19.1  17.6  17.1  16.1  17.3  21.1  19.5  20.8  20.5 |   21.1
                    |                                                                         |
Maximum 2-Minute Avg|    44    41    54    46    40    36    37    41    37    41    44    43 |     54
                    |                                                                         |
Date of Max 2min-Day|    09    02    05    27    28    13    10    26    25    28    16    15 |
               -Year|  2000  1999  2004  2004  2001  2003  1998  1997  1998  2003  2002  2006 |
                    |                                                                         |
Maximum Peak Gust   |    52    49    60    53    49    49    47    45    45    52    53    49 |     60
                    |                                                                         |
Date of Max Gust-Day|    09    02    05    27    01    01    10    26    25    28    16    15 |
               -Year|  2000  1999  2004  2004  2006  2001  1998  1997  1998  2003  2002  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.6   3.4   5.6   5.7   6.2   5.7   2.7   2.1   2.7   3.7   2.5   2.8 |   45.6
   Peak Gust >=40   |   0.5   0.5   0.9   1.0   0.6   0.4   0.2   0.6   0.3   0.7   0.3   0.3 |    6.4
   Peak Gust >=50   |   0.1   0.0   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.1   0.0 |    0.4
                    |                                                                         |
   Max 2-Minute >=30|   1.0   1.3   3.1   1.6   2.4   1.5   0.6   0.9   0.9   1.2   0.6   0.0 |   15.0
   Max 2-Minute >=40|   0.1   0.1   0.2   0.3   0.1   0.0   0.0   0.1   0.0   0.2   0.1   0.0 |    1.1
                    |                                                                         |
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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.