STATION:  MONTAGUE-SISKIYOU COUNTY AIRPORT (KSIY), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Jan 2001 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        |  45.0  50.5  57.4  61.4  73.2  82.0  93.0  90.3  82.8  68.4  52.2  44.9 |   66.8
Avg Min Temp        |  25.9  26.3  29.4  32.9  40.9  46.5  55.2  51.7  43.7  35.1  29.7  27.4 |   37.1
Avg Temperature     |  35.5  38.4  43.4  47.2  57.1  64.2  74.1  71.0  63.2  51.7  41.0  36.1 |   51.9
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    62    66    77    84    98   104   109   105    98    91    72    60 |    109
                    |                                                                         |
    Date of Ext-Day |    31    22    31    26    16    25    11    14    02    01    07    24 |
               -Year|  2003  2002  2002  2004  2008  2006  2002  2008  2003  2001  2006  2005 |
                    |                                                                         |
    Extreme Min Temp|     3     9    11    15    19    33    45    37    28    12    13    -2 |     -2
                    |                                                                         |
    Date of Ext-Day |    28    05    31    05    01    04    08    31    29    31    01    16 |
               -Year|  2008  2008  2008  2001  2008  2005  2001  2008  2007  2002  2002  2008 |
                    |                                                                         |
Heating Degree Days |   916   751   669   535   266    93     0     9   107   412   721   895 |   5375
Cooling Degree Days |     0     0     0     0    20    71   282   195    55     1     0     0 |    624
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   2.8   6.5  23.1  18.7   9.2   0.3   0.0   0.0 |   60.5
    Max Temp >= 75  |   0.0   0.0   0.9   4.0  14.2  24.0  30.9  30.1  23.8   8.7   0.0   0.0 |  136.6
    Max Temp <= 32  |   0.6   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.9 |    1.5
                    |                                                                         |
    Min Temp <= 32  |  25.5  22.5  21.0  13.0   3.4   0.0   0.0   0.0   0.9  12.0  20.2  22.9 |  141.3
    Min Temp <= 20  |   7.3   6.3   2.9   0.9   0.1   0.0   0.0   0.0   0.0   0.4   2.8   7.3 |   28.0
    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   0.3 |    0.3
                    |                                                                         |
Avg Dew Point Temp  |  28.8  28.5  31.6  34.1  39.6  41.3  46.3  43.8  37.3  33.6  32.6  29.4 |   35.6
Avg Wet Bulb Temp   |  32.4  33.9  38.2  41.3  48.4  52.3  58.2  56.2  50.0  42.5  36.9  32.7 |   43.6
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.23 30.16 30.13 30.05 30.02 30.00 29.97 29.97 30.01 30.11 30.21 30.19 |  30.09
(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   |   0.4   0.1   0.6   0.4   2.1   2.0   2.5   1.4   1.0   0.1   0.1   0.1 |   11.0
    Heavy Fog       |   6.0   1.8   1.8   0.4   1.1   0.0   0.0   0.0   0.1   0.4   5.3   6.2 |   23.0
    Fog             |  13.0   7.5   7.2   6.7   3.4   0.5   0.4   0.4   0.9   2.1  13.1  13.7 |   68.9
    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     |  1.50  1.19  0.90  1.10  1.04  0.17  0.11  0.20  0.22  0.72  2.05  3.22 |  12.41
                    |                                                                         |
Maximum Daily       |  1.28  1.43  0.57  1.08  0.64  0.24  0.67  0.53  0.70  1.42  1.51  2.14 |   2.14
                    |                                                                         |
    Date of Ext-Day |    04    21    01    30    28    04    10    06    24    19    07    30 |
               -Year|  2008  2007  2004  2002  2008  2007  2001  2006  2001  2007  2005  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  10.9   7.9   9.0   9.8   7.2   2.9   1.1   1.3   1.2   4.4  10.6  12.5 |   78.9
    >= 0.10         |   4.3   3.4   2.9   3.4   3.5   0.6   0.1   0.5   0.8   1.9   5.3   6.2 |   32.9
    >= 0.25         |   2.1   1.1   0.9   1.1   1.5   0.0   0.1   0.4   0.2   0.9   2.4   4.2 |   15.0
    >= 0.50         |   0.5   0.6   0.3   0.4   0.4   0.0   0.1   0.1   0.1   0.3   1.1   1.6 |    5.5
    >= 1.00         |   0.1   0.1   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.3   0.9 |    1.6
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.1   5.5   6.5   6.7   6.8   7.6   6.5   6.3   5.5   5.1   4.5   6.2 |    6.0
Daily Avg Max 2-Min |  16.2  17.8  19.0  20.1  18.6  20.0  18.5  18.3  17.1  15.7  15.2  19.0 |   18.0
Daily Avg Peak Gust |  19.3  21.0  22.8  24.3  22.9  24.7  22.9  22.3  20.4  18.7  18.4  22.6 |   21.7
                    |                                                                         |
Maximum Daily Avg   |  23.6  23.5  25.7  17.8  22.2  20.3  12.2  14.2  15.7  27.2  24.7  30.1 |   30.1
                    |                                                                         |
Maximum 2-Minute Avg|    58    70    58    39    36    39    29    38    38    43    48    53 |     70
                    |                                                                         |
Date of Max 2min-Day|    04    14    13    07    06    16    22    28    16    31    07    14 |
               -Year|  2008  2006  2003  2006  2004  2005  2002  2003  2008  2008  2002  2002 |
                    |                                                                         |
Maximum Peak Gust   |    86    72    68    55    45    47    40    48    51    52    56    66 |     86
                    |                                                                         |
Date of Max Gust-Day|    14    14    13    07    23    16    29    28    16    31    07    14 |
               -Year|  2006  2006  2003  2006  2006  2005  2008  2003  2008  2008  2002  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   6.5   5.6   7.1   7.0   5.9   5.4   2.0   2.8   3.0   4.3   5.3   9.1 |   64.1
   Peak Gust >=40   |   2.3   2.1   2.8   1.8   0.4   0.7   0.1   0.3   0.3   0.8   1.6   5.4 |   18.5
   Peak Gust >=50   |   1.0   0.8   1.0   0.1   0.0   0.0   0.0   0.0   0.1   0.3   0.5   1.4 |    5.3
                    |                                                                         |
   Max 2-Minute >=30|   3.8   3.0   3.7   2.5   1.3   1.1   0.0   0.4   1.0   1.8   2.6   0.0 |   21.1
   Max 2-Minute >=40|   1.1   1.4   0.9   0.0   0.0   0.0   0.0   0.0   0.0   0.4   0.8   0.0 |    4.7
                    |                                                                         |
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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.