STATION:  JORDAN AIRPORT (KJDN), MT

CLIMATOLOGICAL SUMMARY.  Period of Record: Sep 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        |  32.1  35.7  45.8  58.3  66.8  74.8  89.1  85.9  74.2  58.6  45.9  34.9 |   58.5
Avg Min Temp        |   5.2  11.0  20.4  29.9  39.1  47.9  56.0  53.2  41.7  29.6  17.9   8.4 |   30.0
Avg Temperature     |  18.7  23.4  33.1  44.1  52.9  61.4  72.5  69.5  57.9  44.1  31.9  21.7 |   44.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    66    69    80    86    93    99   109   104   101    92    80    64 |    109
                    |                                                                         |
    Date of Ext-Day |    08    22    31    27    13    30    14    10    04    02    12    11 |
               -Year|  2002  2002  2004  2001  2001  2003  2002  2000  1998  1997  1999  2004 |
                    |                                                                         |
    Extreme Min Temp|   -40   -27   -31     7    18    29    40    36    21    -1   -30   -32 |    -40
                    |                                                                         |
    Date of Ext-Day |    12    24    08    02    02    18    10    17    30    31    23    15 |
               -Year|  1998  2003  2002  2002  2005  2004  1999  2002  2003  2002  2003  2008 |
                    |                                                                         |
Heating Degree Days |  1436  1176   988   628   382   151    12    32   246   649   993  1343 |   8035
Cooling Degree Days |     0     0     0     0     8    42   245   173    35     1     0     0 |    503
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   1.8  15.3  12.0   3.4   0.1   0.0   0.0 |   32.8
    Max Temp >= 75  |   0.0   0.0   0.6   2.3   8.6  15.2  29.6  27.2  14.8   3.3   0.3   0.0 |  101.7
    Max Temp <= 32  |  12.9   9.9   5.3   0.5   0.0   0.0   0.0   0.0   0.0   1.0   6.1  11.1 |   46.8
                    |                                                                         |
    Min Temp <= 32  |  30.7  27.7  28.3  19.0   7.2   0.2   0.0   0.0   4.1  20.2  28.1  30.9 |  196.5
    Min Temp <= 20  |  24.3  20.4  11.8   3.7   0.4   0.0   0.0   0.0   0.0   3.5  15.3  24.7 |  104.2
    Min Temp  <= 0  |  10.7   6.5   2.1   0.0   0.0   0.0   0.0   0.0   0.0   0.1   2.5   7.6 |   29.5
                    |                                                                         |
Avg Dew Point Temp  |  12.8  14.9  21.6  29.7  37.8  47.0  50.0  46.3  38.6  30.4  20.9  13.7 |   30.3
Avg Wet Bulb Temp   |  18.0  20.8  28.6  38.0  46.0  53.8  59.8  56.9  48.3  37.8  27.6  19.5 |   37.9
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.13 30.11 30.09 30.05 30.01 29.95 29.92 29.94 30.00 30.08 30.12 30.12 |  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   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Heavy Fog       |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Fog             |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Hail            |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.23  0.30  0.33  1.20  1.84  2.28  1.45  1.16  0.78  1.06  0.44  0.19 |  11.26
                    |                                                                         |
Maximum Daily       |  0.26  0.27  0.42  1.31  0.94  1.49  1.58  1.43  0.78  0.79  0.98  0.35 |   1.58
                    |                                                                         |
    Date of Ext-Day |    02    16    30    19    31    08    26    10    21    28    20    29 |
               -Year|  2000  2008  2006  2005  2000  2005  2001  2005  2000  1998  2007  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   4.9   5.5   6.3   8.0   9.8  10.5   7.6   6.5   6.6   7.0   4.5   3.7 |   80.9
    >= 0.10         |   0.6   1.0   0.8   2.8   4.7   5.1   3.8   2.8   2.4   2.8   1.0   0.5 |   28.5
    >= 0.25         |   0.1   0.1   0.2   1.3   2.6   2.6   1.7   1.3   1.1   1.5   0.6   0.1 |   13.1
    >= 0.50         |   0.0   0.0   0.0   0.8   1.0   1.5   0.7   0.6   0.3   0.5   0.2   0.0 |    5.8
    >= 1.00         |   0.0   0.0   0.0   0.1   0.0   0.4   0.3   0.3   0.0   0.0   0.0   0.0 |    1.0
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   7.4   7.9   9.1   9.6  10.4   9.3   8.2   8.4   8.1   8.1   8.0   7.9 |    8.5
Daily Avg Max 2-Min |  18.3  18.4  20.9  22.2  23.6  22.5  22.6  21.2  20.2  20.2  20.0  19.6 |   20.8
Daily Avg Peak Gust |  21.7  21.8  25.3  27.7  29.4  28.2  28.4  26.8  25.2  24.5  24.2  23.5 |   25.6
                    |                                                                         |
Maximum Daily Avg   |  21.4  24.7  22.3  30.8  24.5  25.6  22.6  19.6  23.6  23.0  25.5  25.6 |   30.8
                    |                                                                         |
Maximum 2-Minute Avg|    41    48    48    48    51    54    58    47    46    53    44    55 |     58
                    |                                                                         |
Date of Max 2min-Day|    10    11    24    05    11    28    08    14    15    31    13    13 |
               -Year|  2000  2002  2008  2000  2000  2005  2000  1999  1997  1999  2006  2006 |
                    |                                                                         |
Maximum Peak Gust   |    52    62    66    60    64    68    76    66    55    69    56    79 |     79
                    |                                                                         |
Date of Max Gust-Day|    10    11    24    05    11    21    04    14    15    31    13    13 |
               -Year|  2000  2002  2008  2000  2000  1999  2002  1999  1997  1999  2006  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.9   5.8   8.3  11.2  14.5  11.8  12.3  10.0   7.8   7.8   7.8   6.9 |  110.0
   Peak Gust >=40   |   1.5   1.2   2.7   3.1   3.6   3.5   3.5   2.8   0.9   1.7   2.4   2.4 |   29.4
   Peak Gust >=50   |   0.1   0.3   0.2   0.2   0.5   0.7   1.4   0.7   0.1   0.2   0.3   0.6 |    5.3
                    |                                                                         |
   Max 2-Minute >=30|   2.3   2.0   4.1   4.6   6.8   5.4   5.1   3.4   2.4   3.3   3.8   0.0 |   43.1
   Max 2-Minute >=40|   0.3   0.4   0.6   0.5   0.6   0.7   1.5   0.7   0.3   0.3   0.4   0.0 |    6.3
                    |                                                                         |
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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.