STATION:  GLASGOW INTL AIRPORT (KGGW), MT

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        |  24.4  29.7  41.8  57.8  67.4  75.0  86.9  85.3  72.8  56.9  40.4  28.1 |   55.5
Avg Min Temp        |   4.4  10.1  19.9  31.9  41.4  50.7  58.0  55.9  45.3  32.3  19.3   8.4 |   31.5
Avg Temperature     |  14.4  19.9  30.8  44.8  54.4  62.9  72.4  70.6  59.1  44.6  29.9  18.2 |   43.5
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    61    66    77    87    96    99   106   103    99    88    79    62 |    106
                    |                                                                         |
    Date of Ext-Day |    08    22    12    27    18    27    24    19    04    02    12    11 |
               -Year|  2002  2002  2007  2001  2006  2002  2007  2008  1998  1997  1999  2004 |
                    |                                                                         |
    Extreme Min Temp|   -34   -27   -27     4    20    32    45    38    24     1   -20   -36 |    -36
                    |                                                                         |
    Date of Ext-Day |    27    24    09    03    01    03    08    10    30    31    23    25 |
               -Year|  1997  2003  2002  2002  2002  1998  1996  1997  2003  2006  1996  1996 |
                    |                                                                         |
Heating Degree Days |  1570  1274  1059   606   339   121    11    28   221   634  1054  1450 |   8366
Cooling Degree Days |     0     0     0     0    11    57   241   200    43     1     0     0 |    553
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   1.5  11.8  10.8   2.7   0.0   0.0   0.0 |   27.2
    Max Temp >= 75  |   0.0   0.0   0.4   2.2   8.7  16.0  28.8  26.8  13.1   2.6   0.1   0.0 |   98.8
    Max Temp <= 32  |  19.3  16.0   7.8   1.0   0.0   0.0   0.0   0.0   0.0   1.0   9.2  16.5 |   70.8
                    |                                                                         |
    Min Temp <= 32  |  30.8  28.2  28.1  14.9   4.2   0.1   0.0   0.0   1.4  14.9  27.1  30.9 |  180.6
    Min Temp <= 20  |  26.4  21.4  13.0   3.2   0.2   0.0   0.0   0.0   0.0   2.8  14.1  24.8 |  105.9
    Min Temp  <= 0  |  11.5   6.2   2.9   0.0   0.0   0.0   0.0   0.0   0.0   0.0   2.5   8.5 |   31.6
                    |                                                                         |
Avg Dew Point Temp  |   9.5  14.1  20.5  28.2  36.8  47.4  51.4  47.0  40.0  30.5  20.6  12.3 |   29.8
Avg Wet Bulb Temp   |  13.3  18.2  26.8  37.6  46.0  54.4  60.1  57.3  49.0  38.1  26.2  16.5 |   37.0
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.15 30.12 30.09 30.04 30.00 29.95 29.92 29.94 29.99 30.07 30.13 30.13 |  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   0.1   0.3   2.1   5.4   7.6   4.5   1.2   0.2   0.0   0.0 |   21.5
    Heavy Fog       |   4.4   3.8   2.4   1.2   0.7   0.4   0.4   0.1   0.5   1.5   2.7   3.0 |   21.2
    Fog             |  15.1  14.2  11.0   7.6   6.2   7.6   4.3   3.3   4.0   6.2   9.8  11.2 |  100.5
    Hail            |   0.1   0.0   0.2   0.1   0.2   0.1   0.3   0.2   0.1   0.0   0.0   0.0 |    1.2
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.27  0.26  0.29  1.03  2.20  2.93  1.79  0.91  1.08  0.84  0.41  0.30 |  12.32
                    |                                                                         |
Maximum Daily       |  0.20  0.64  0.30  1.04  1.69  2.82  1.37  1.45  1.12  1.22  0.48  0.21 |   2.82
                    |                                                                         |
    Date of Ext-Day |    05    28    29    25    01    16    01    28    16    10    06    26 |
               -Year|  1999  2006  2000  1998  2008  2007  1997  1997  1996  1998  2000  2003 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   5.8   5.3   5.8   7.7   9.9  12.7   7.9   6.8   6.9   6.2   6.1   6.1 |   87.2
    >= 0.10         |   0.8   0.7   0.9   3.9   5.2   6.5   4.0   3.3   2.6   2.1   1.6   1.0 |   32.7
    >= 0.25         |   0.0   0.1   0.2   1.1   3.4   3.5   1.9   0.8   1.5   0.8   0.2   0.0 |   13.5
    >= 0.50         |   0.0   0.1   0.0   0.2   1.1   1.5   1.2   0.3   0.5   0.5   0.0   0.0 |    5.5
    >= 1.00         |   0.0   0.0   0.0   0.1   0.3   0.6   0.5   0.1   0.1   0.1   0.0   0.0 |    1.8
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   9.2   9.3  11.5  11.9  12.4  11.0  10.3  10.7  10.3  10.2   9.3   9.3 |   10.4
Daily Avg Max 2-Min |  19.4  19.0  22.4  24.2  25.3  23.5  23.2  22.8  21.5  21.2  19.7  19.7 |   21.8
Daily Avg Peak Gust |  22.6  21.9  26.6  29.4  31.1  29.2  28.8  28.1  26.2  25.4  23.3  22.9 |   26.3
                    |                                                                         |
Maximum Daily Avg   |  26.4  23.4  30.1  27.0  30.6  29.7  22.5  23.0  26.5  25.9  29.0  31.4 |   31.4
                    |                                                                         |
Maximum 2-Minute Avg|    56    46    48    52    44    54    68    66    46    54    45    53 |     68
                    |                                                                         |
Date of Max 2min-Day|    03    11    24    05    20    29    03    28    15    31    04    27 |
               -Year|  2003  2002  2008  2000  2001  2002  2000  1997  1997  1999  1999  2000 |
                    |                                                                         |
Maximum Peak Gust   |    66    56    62    62    62    66    82    76    54    66    56    66 |     82
                    |                                                                         |
Date of Max Gust-Day|    03    11    24    05    18    29    03    28    10    31    18    27 |
               -Year|  2003  2002  2008  2000  2008  2002  2000  1997  2005  1999  2007  2000 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   6.4   5.3  10.2  13.2  15.9  13.4  12.6  12.5   9.0   9.2   6.6   7.2 |  121.4
   Peak Gust >=40   |   1.8   1.2   2.9   4.0   5.4   4.1   3.9   2.7   1.6   2.5   2.1   2.0 |   34.2
   Peak Gust >=50   |   0.2   0.3   0.3   0.5   0.4   1.0   1.0   0.7   0.2   0.2   0.4   0.5 |    5.7
                    |                                                                         |
   Max 2-Minute >=30|   3.8   2.5   4.8   6.9   9.0   6.6   5.5   4.7   3.4   4.0   3.5   0.0 |   54.8
   Max 2-Minute >=40|   0.3   0.3   0.7   0.8   0.8   1.0   1.1   0.8   0.2   0.4   0.6   0.0 |    6.8
                    |                                                                         |
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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.