STATION:  BELGRADE-GALLATIN FIELD AIRPORT (KBZN), 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        |  31.9  36.3  46.7  55.7  65.3  72.9  87.3  84.8  72.8  58.3  42.8  32.4 |   57.3
Avg Min Temp        |   9.6  12.9  20.9  28.2  36.6  43.6  49.3  46.9  38.3  28.8  18.2   9.7 |   28.6
Avg Temperature     |  20.7  24.6  33.8  41.9  50.9  58.2  68.3  65.8  55.6  43.5  30.5  21.0 |   42.9
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    60    71    76    83    91   100   107   102    99    87    74    60 |    107
                    |                                                                         |
    Date of Ext-Day |    23    12    12    28    29    28    13    25    02    01    12    11 |
               -Year|  2007  2003  2007  2007  2003  2007  2002  2008  2007  1997  1999  2004 |
                    |                                                                         |
    Extreme Min Temp|   -36   -35   -17    -4    14    29    26    33    16    -6   -18   -28 |    -36
                    |                                                                         |
    Date of Ext-Day |    06    24    02    06    09    05    01    06    24    31    29    21 |
               -Year|  2004  2003  2002  1997  2002  1998  2000  1996  2000  2006  2006  1998 |
                    |                                                                         |
Heating Degree Days |  1372  1141   968   692   437   217    31    56   295   666  1034  1363 |   8273
Cooling Degree Days |     0     0     0     0     2    14   133    82    12     0     0     0 |    243
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.2   1.0  12.1   9.2   1.6   0.0   0.0   0.0 |   24.0
    Max Temp >= 75  |   0.0   0.0   0.2   1.4   7.1  13.4  29.2  27.5  14.5   2.9   0.0   0.0 |   96.2
    Max Temp <= 32  |  14.3   9.2   3.1   0.8   0.0   0.0   0.0   0.0   0.0   0.8   6.8  15.0 |   50.0
                    |                                                                         |
    Min Temp <= 32  |  30.1  27.3  28.2  21.9   9.6   0.6   0.1   0.0   5.8  21.4  27.2  30.2 |  202.4
    Min Temp <= 20  |  24.2  20.3  13.0   4.3   0.4   0.0   0.0   0.0   0.3   4.4  15.9  23.3 |  106.0
    Min Temp  <= 0  |   7.2   3.8   1.4   0.1   0.0   0.0   0.0   0.0   0.0   0.2   3.2   7.4 |   23.2
                    |                                                                         |
Avg Dew Point Temp  |  14.4  16.3  21.8  27.8  35.8  44.0  46.4  43.5  36.5  29.0  20.8  14.2 |   29.2
Avg Wet Bulb Temp   |  19.4  22.0  29.1  35.8  43.6  50.5  55.6  53.0  45.8  36.7  26.8  19.2 |   36.5
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.18 30.15 30.07 30.04 29.99 29.96 29.96 29.98 30.01 30.10 30.16 30.20 |  30.07
(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   |   1.5   2.7   4.3   4.8  10.1  10.7   9.4   8.8   5.2   2.7   2.9   3.1 |   66.1
    Heavy Fog       |   3.6   2.3   2.6   0.7   0.4   0.3   0.2   0.3   0.2   0.7   2.0   2.4 |   15.6
    Fog             |  14.4  10.7  10.5   9.2   7.2   7.4   2.4   3.1   3.6   6.0   9.8  12.2 |   96.5
    Hail            |   0.2   0.0   0.0   0.3   0.1   0.3   0.2   0.2   0.1   0.1   0.0   0.0 |    1.4
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.55  0.41  0.73  1.65  2.33  2.74  0.92  0.90  0.89  1.15  0.56  0.49 |  13.32
                    |                                                                         |
Maximum Daily       |  0.71  0.29  0.41  0.87  1.01  1.38  1.11  0.73  0.83  1.15  0.51  0.39 |   1.38
                    |                                                                         |
    Date of Ext-Day |    14    22    28    17    22    06    10    05    11    16    19    03 |
               -Year|  2003  2003  2000  2003  2002  2007  1997  2007  1997  2006  2007  1998 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   6.9   7.1   8.2  11.4  12.7  13.5   7.6   8.4   7.6   8.3   7.1   6.9 |  105.7
    >= 0.10         |   1.8   1.3   2.8   5.5   6.9   7.0   2.7   3.0   2.8   3.5   1.6   1.5 |   40.5
    >= 0.25         |   0.4   0.2   0.7   2.2   3.5   4.2   1.1   1.1   1.2   1.5   0.6   0.5 |   17.1
    >= 0.50         |   0.1   0.0   0.0   0.8   1.0   1.3   0.2   0.2   0.2   0.3   0.1   0.0 |    4.1
    >= 1.00         |   0.0   0.0   0.0   0.0   0.1   0.3   0.1   0.0   0.0   0.1   0.0   0.0 |    0.5
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.8   5.3   6.3   6.8   6.5   6.0   5.9   6.1   5.8   5.5   4.9   4.9 |    5.7
Daily Avg Max 2-Min |  14.5  15.1  18.3  20.2  20.6  19.6  19.5  20.1  17.8  16.5  15.2  14.7 |   17.7
Daily Avg Peak Gust |  16.9  17.7  21.8  24.5  25.0  23.9  24.5  24.8  21.6  19.6  18.0  17.1 |   21.3
                    |                                                                         |
Maximum Daily Avg   |  16.4  16.0  17.2  18.1  14.6  11.6  12.7  12.5  15.4  17.4  16.0  18.4 |   18.4
                    |                                                                         |
Maximum 2-Minute Avg|    41    44    41    40    40    47    48    48    48    44    51    47 |     51
                    |                                                                         |
Date of Max 2min-Day|    15    19    09    28    20    04    07    05    18    31    11    15 |
               -Year|  2008  1997  2006  2000  2008  2006  2007  2003  1998  1999  2003  2000 |
                    |                                                                         |
Maximum Peak Gust   |    52    86    51    54    51    58    60    62    56    53    59    56 |     86
                    |                                                                         |
Date of Max Gust-Day|    15    09    09    17    20    04    07    05    18    31    11    29 |
               -Year|  2008  2002  2006  2005  2008  2006  2007  2003  1998  1999  2003  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.4   3.8   7.4   7.4   9.0   7.1   8.2   9.2   5.2   4.3   4.5   3.1 |   72.8
   Peak Gust >=40   |   0.7   0.8   1.8   1.8   1.5   1.0   2.7   2.6   1.4   0.9   0.8   0.9 |   16.8
   Peak Gust >=50   |   0.1   0.3   0.1   0.2   0.1   0.3   0.4   0.7   0.2   0.1   0.2   0.2 |    2.8
                    |                                                                         |
   Max 2-Minute >=30|   1.1   1.6   3.4   3.4   3.2   2.2   3.6   3.9   1.7   1.3   1.3   0.0 |   26.7
   Max 2-Minute >=40|   0.1   0.3   0.1   0.2   0.1   0.3   0.3   0.5   0.2   0.1   0.2   0.0 |    2.4
                    |                                                                         |
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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.