STATION:  MOUNT SHASTA (KMHS), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Aug 1996 to Dec 2008

Summaries based on unedited daily ASOS data.  Errors may be present.

-----------------------------------------------------------------------------------------------

TEMPERATURE (F)     |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Avg Max Temp        |  43.6  46.3  53.2  58.3  68.7  76.7  85.6  84.4  77.7  64.6  50.4  43.2 |   62.7
Avg Min Temp        |  27.9  28.8  31.4  34.3  41.3  47.0  51.5  49.6  44.0  37.1  31.7  27.8 |   37.7
Avg Temperature     |  35.8  37.5  42.3  46.3  55.0  61.8  68.5  67.0  60.9  50.8  41.0  35.5 |   50.2
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    72    67    77    83    95    96   101   100    97    88    72    60 |    101
                    |                                                                         |
    Date of Ext-Day |    18    09    30    26    17    24    10    14    02    08    02    07 |
               -Year|  1997  2006  2003  2004  2008  2006  2002  2008  1998  1996  1997  2006 |
                    |                                                                         |
    Extreme Min Temp|     7    12    15    18    26    32    37    37    30    22    13     0 |      0
                    |                                                                         |
    Date of Ext-Day |    13    19    08    20    04    04    01    05    25    21    29    21 |
               -Year|  1997  2006  2002  2008  1999  2001  1997  2002  2005  1996  2006  1998 |
                    |                                                                         |
Heating Degree Days |   906   776   703   561   321   127    20    33   147   440   719   915 |   5668
Cooling Degree Days |     0     0     0     0    10    32   129    96    24     1     0     0 |    293
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.6   1.3   7.9   7.3   1.8   0.0   0.0   0.0 |   19.0
    Max Temp >= 75  |   0.0   0.0   0.3   2.6   9.9  19.5  29.9  28.5  20.2   6.0   0.0   0.0 |  116.9
    Max Temp <= 32  |   1.0   0.3   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   1.3 |    3.0
                    |                                                                         |
    Min Temp <= 32  |  23.5  21.4  18.8  11.4   2.8   0.1   0.0   0.0   0.6   6.3  18.3  24.0 |  127.2
    Min Temp <= 20  |   4.2   2.4   1.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   1.4   3.6 |   12.8
    Min Temp  <= 0  |   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
                    |                                                                         |
Avg Dew Point Temp  |  28.9  29.5  31.1  33.8  40.0  45.3  49.7  46.9  41.3  36.5  33.6  28.8 |   37.1
Avg Wet Bulb Temp   |  32.7  33.7  37.1  40.3  47.3  52.9  57.7  55.6  50.2  43.3  37.3  32.5 |   43.4
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
Avg Sea Level Pres  | 30.20 30.16 30.12 30.07 30.04 30.01 30.01 30.02 30.03 30.12 30.19 30.23 |  30.10
(Inches of Mercury) |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
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       |   4.2   3.9   2.5   1.6   0.4   0.2   0.1   0.1   0.1   0.8   2.8   3.7 |   20.3
    Fog             |  21.1  17.4  13.9  11.0   6.2   4.2   0.8   1.9   1.9   5.9  20.0  20.8 |  125.1
    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
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  6.11  7.40  3.99  3.00  1.91  1.23  0.34  0.35  0.48  1.89  5.12  7.87 |  39.69
                    |                                                                         |
Maximum Daily       |  2.54  3.88  2.62  1.69  1.57  1.87  1.17  1.28  1.07  3.53  3.39  3.09 |   3.88
                    |                                                                         |
    Date of Ext-Day |    04    17    04    12    08    17    05    20    24    19    07    31 |
               -Year|  2008  2004  2001  2003  2005  2005  2000  1997  2001  2004  2002  1996 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  14.1  13.7  11.7  11.4   8.8   4.3   1.8   2.8   2.8   6.3  12.1  13.6 |  103.3
    >= 0.10         |   9.2   9.5   6.7   5.8   4.4   2.4   0.5   1.1   1.2   3.6   7.5   9.6 |   61.4
    >= 0.25         |   6.9   6.5   4.2   4.1   2.8   1.1   0.4   0.3   0.5   2.0   5.1   6.9 |   40.8
    >= 0.50         |   4.5   4.4   2.8   2.2   1.2   0.8   0.3   0.1   0.2   1.2   3.4   5.2 |   26.1
    >= 1.00         |   2.0   2.6   1.1   0.6   0.2   0.3   0.1   0.1   0.1   0.4   1.6   2.9 |   11.9
                    |                                                                         |
------------------------------------------------------------------------------------------------------
                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   3.3   3.5   4.0   4.1   3.9   4.1   2.7   2.6   3.0   3.3   3.1   3.5 |    3.4
Daily Avg Max 2-Min |  11.0  11.2  12.0  11.9  11.4  11.5   9.3   9.2  10.1  10.7  10.6  11.5 |   10.9
Daily Avg Peak Gust |  17.8  18.0  19.0  19.1  18.3  18.5  15.3  15.1  16.1  16.9  17.0  18.5 |   17.5
                    |                                                                         |
Maximum Daily Avg   |  10.4  12.2  12.4  12.8  12.2  11.9   8.2   8.7   9.7   9.4  11.0  11.6 |   12.8
                    |                                                                         |
Maximum 2-Minute Avg|    22    23    24    23    21    23    17    18    20    21    22    22 |     24
                    |                                                                         |
Date of Max 2min-Day|    04    07    29    02    22    16    26    30    23    08    03    31 |
               -Year|  2007  2001  1998  1997  2008  1998  1997  1999  2005  2001  2004  1996 |
                    |                                                                         |
Maximum Peak Gust   |    41    38    39    39    40    37    28    29    31    33    35    40 |     41
                    |                                                                         |
Date of Max Gust-Day|    20    13    27    03    21    16    10    30    02    24    03    14 |
               -Year|  2007  2008  2007  1999  2008  1998  2008  2008  2004  2006  2004  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   0.6   1.1   1.0   1.7   0.8   0.7   0.0   0.0   0.4   0.3   0.5   0.9 |    8.2
   Peak Gust >=40   |   0.1   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.2 |    0.3
   Peak Gust >=50   |   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
                    |                                                                         |
   Max 2-Minute >=30|   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
   Max 2-Minute >=40|   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
                    |                                                                         |
------------------------------------------------------------------------------------------------------

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.