STATION:  MONTROSE REGIONAL AIRPORT (KMTJ), CO

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        |  39.8  44.8  55.7  63.5  75.0  85.4  91.1  86.4  77.5  65.4  50.9  38.6 |   64.5
Avg Min Temp        |  17.0  21.7  27.8  35.0  43.2  50.9  58.1  55.8  47.0  36.0  25.2  15.7 |   36.1
Avg Temperature     |  28.4  33.2  41.7  49.2  59.1  68.2  74.6  71.1  62.3  50.7  38.1  27.2 |   50.3
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    58    66    78    84    98    99   101   100    92    84    73    64 |    101
                    |                                                                         |
    Date of Ext-Day |    02    27    20    27    31    29    14    01    01    02    01    01 |
               -Year|  1998  2006  2004  2000  2002  1998  2002  2008  1996  2000  2008  1999 |
                    |                                                                         |
    Extreme Min Temp|   -11    -8     0    16    25    34    43    41    25    19    -9   -13 |    -13
                    |                                                                         |
    Date of Ext-Day |    05    01    02    16    03    06    02    28    29    23    30    22 |
               -Year|  2004  2002  2002  1999  2008  1999  1997  2004  1999  2008  2006  1998 |
                    |                                                                         |
Heating Degree Days |  1133   897   722   473   207    40     0     3   120   445   808  1173 |   6022
Cooling Degree Days |     0     0     0     0    23   135   298   193    38     1     0     0 |    688
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   1.2  10.8  20.6   9.2   1.2   0.0   0.0   0.0 |   43.1
    Max Temp >= 75  |   0.0   0.0   0.4   4.0  18.8  27.1  30.8  30.1  20.7   6.1   0.0   0.0 |  138.1
    Max Temp <= 32  |   5.8   2.2   0.6   0.0   0.0   0.0   0.0   0.0   0.0   0.0   1.3   7.8 |   17.8
                    |                                                                         |
    Min Temp <= 32  |  29.8  26.4  24.0  11.2   1.8   0.0   0.0   0.0   0.8  10.6  25.2  30.5 |  160.2
    Min Temp <= 20  |  19.1  11.2   3.8   0.5   0.0   0.0   0.0   0.0   0.0   0.2   7.6  21.8 |   64.1
    Min Temp  <= 0  |   1.2   0.4   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   1.3 |    3.2
                    |                                                                         |
Avg Dew Point Temp  |  17.7  19.3  21.4  24.1  30.2  33.6  45.0  46.7  40.0  30.8  22.6  16.6 |   29.0
Avg Wet Bulb Temp   |  24.1  27.5  33.4  38.6  45.5  50.6  57.4  56.7  50.1  40.8  31.2  22.9 |   39.9
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.18 30.11 30.04 29.95 29.93 29.90 29.92 29.97 29.99 30.06 30.15 30.20 |  30.03
(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   0.2   1.0   1.7   2.3   3.8   6.4   7.4   4.5   1.9   0.1   0.2 |   29.4
    Heavy Fog       |   1.7   1.2   0.9   0.4   0.2   0.0   0.0   0.1   0.1   0.1   0.9   1.8 |    7.3
    Fog             |  11.4   8.1   6.0   4.2   2.0   1.3   2.5   3.0   4.3   5.0   6.4  10.3 |   64.6
    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     |  0.43  0.37  0.52  0.91  0.63  0.39  0.51  0.87  1.50  1.10  0.62  0.48 |   8.34
                    |                                                                         |
Maximum Daily       |  0.37  0.42  0.47  0.67  0.92  0.44  0.95  0.50  0.77  0.96  0.73  0.52 |   0.96
                    |                                                                         |
    Date of Ext-Day |    03    28    18    30    25    17    31    16    04    25    28    01 |
               -Year|  2004  2007  1998  1999  1997  1999  1999  2005  1997  1998  2006  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   5.7   6.5   7.1   7.2   4.4   3.9   5.0   7.3   8.8   7.2   6.2   5.6 |   74.7
    >= 0.10         |   1.3   1.2   1.5   2.8   1.8   1.2   1.7   3.1   3.9   3.2   1.9   1.9 |   25.5
    >= 0.25         |   0.2   0.2   0.5   1.5   0.9   0.4   0.4   1.2   2.5   1.5   0.7   0.3 |   10.3
    >= 0.50         |   0.0   0.0   0.0   0.2   0.4   0.0   0.2   0.1   0.6   0.5   0.2   0.1 |    2.2
    >= 1.00         |   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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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.4   5.9   7.3   8.5   8.3   8.4   7.3   6.8   7.0   6.6   5.8   5.3 |    6.9
Daily Avg Max 2-Min |  14.9  16.8  19.3  22.7  22.1  21.8  22.0  20.2  18.5  17.4  15.2  15.5 |   18.9
Daily Avg Peak Gust |  18.1  20.8  24.2  29.2  28.5  28.1  27.3  25.1  23.1  21.4  18.4  18.4 |   23.5
                    |                                                                         |
Maximum Daily Avg   |  17.4  18.5  21.8  20.2  20.3  18.9  13.1  11.9  17.0  15.6  14.6  16.1 |   21.8
                    |                                                                         |
Maximum 2-Minute Avg|    36    40    46    51    44    43    40    43    39    45    43    43 |     51
                    |                                                                         |
Date of Max 2min-Day|    26    15    14    18    21    06    07    26    16    11    14    26 |
               -Year|  1999  2006  2001  2000  2002  2007  1996  2005  2002  2008  2005  2008 |
                    |                                                                         |
Maximum Peak Gust   |    49    55    56    62    55    58    56    55    54    61    58    56 |     62
                    |                                                                         |
Date of Max Gust-Day|    28    15    30    08    11    06    07    21    29    11    14    26 |
               -Year|  2008  2006  2008  2005  2000  2007  1996  2002  2007  2008  2005  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   4.0   5.2   7.8  13.4  12.6  12.7  11.8   9.2   6.9   6.5   4.1   4.2 |   98.4
   Peak Gust >=40   |   0.8   1.3   2.2   4.3   4.2   2.9   3.0   1.3   1.5   1.8   0.9   0.9 |   25.1
   Peak Gust >=50   |   0.0   0.2   0.5   1.3   1.0   0.2   0.5   0.2   0.3   0.5   0.2   0.2 |    4.8
                    |                                                                         |
   Max 2-Minute >=30|   1.0   1.9   3.3   5.5   5.3   3.8   5.2   3.2   2.1   2.3   1.3   0.0 |   35.0
   Max 2-Minute >=40|   0.0   0.1   0.3   0.7   0.4   0.3   0.2   0.1   0.0   0.3   0.1   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.