STATION:  ALTURAS MUNICIPAL AIRPORT (KAAT), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Jun 1998 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        |  42.3  45.4  53.0  57.6  69.0  78.7  89.8  87.0  79.0  66.0  50.5  41.4 |   63.3
Avg Min Temp        |  19.4  21.7  24.5  28.7  35.6  41.0  46.3  42.9  35.5  27.8  24.2  19.5 |   30.6
Avg Temperature     |  30.8  33.5  38.8  43.2  52.3  59.8  68.0  64.9  57.3  46.9  37.3  30.5 |   46.9
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    62    64    77    80    93   100   107   101    98    87    73    61 |    107
                    |                                                                         |
    Date of Ext-Day |    31    22    20    26    31    25    10    15    02    01    14    01 |
               -Year|  2003  2002  2004  2004  2001  2006  2002  2008  1998  2001  1999  2008 |
                    |                                                                         |
    Extreme Min Temp|    -9    -6    -6    13    17    22    35    28    21     0    -4   -14 |    -14
                    |                                                                         |
    Date of Ext-Day |    13    05    08    09    01    04    05    31    24    31    29    17 |
               -Year|  2005  2008  2002  2001  2008  2001  1999  1999  2000  2002  2004  2008 |
                    |                                                                         |
Heating Degree Days |  1059   889   813   655   396   173    25    60   239   562   830  1071 |   6774
Cooling Degree Days |     0     0     0     0     2    18   119    58     7     0     0     0 |    204
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.9   3.0  16.9  11.7   3.1   0.0   0.0   0.0 |   35.5
    Max Temp >= 75  |   0.0   0.0   0.3   1.9  10.6  21.3  30.3  28.6  21.4   8.5   0.0   0.0 |  123.0
    Max Temp <= 32  |   3.9   1.4   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.7   4.3 |   10.6
                    |                                                                         |
    Min Temp <= 32  |  28.0  26.4  28.4  22.2   9.1   2.2   0.0   0.7   9.7  23.9  24.1  28.3 |  203.0
    Min Temp <= 20  |  15.1  12.7   7.9   2.9   0.2   0.0   0.0   0.0   0.0   3.3  10.2  16.3 |   68.6
    Min Temp  <= 0  |   1.6   0.4   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.4   1.1 |    3.7
                    |                                                                         |
Avg Dew Point Temp  |  23.7  25.0  26.7  29.2  34.0  37.1  39.3  37.2  32.2  27.6  28.2  24.0 |   30.4
Avg Wet Bulb Temp   |  27.9  29.9  33.7  37.1  44.0  48.9  53.3  51.1  45.3  37.9  33.1  27.8 |   39.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.19 30.11 30.08 30.00 29.98 29.95 29.96 29.96 29.99 30.09 30.16 30.19 |  30.06
(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       |   4.7   2.4   2.5   1.9   0.6   0.3   0.3   0.1   0.7   2.4   3.5   3.4 |   22.7
    Fog             |  24.7  21.6  20.8  13.3   5.0   2.4   0.8   1.7   3.0   9.7  20.5  22.8 |  146.2
    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     |  1.14  1.23  1.11  1.36  1.22  0.42  0.22  0.31  0.45  0.72  1.57  1.40 |  11.15
                    |                                                                         |
Maximum Daily       |  0.62  0.82  0.60  0.64  0.92  0.84  1.07  0.49  0.91  0.91  1.04  1.01 |   1.07
                    |                                                                         |
    Date of Ext-Day |    24    09    01    11    28    10    22    10    25    28    29    06 |
               -Year|  2000  1999  2004  2007  2008  1998  1998  1999  1998  2004  2003  2003 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  12.7  12.0  10.9  11.6   7.4   4.1   2.0   2.1   3.4   4.7  11.1  12.8 |   94.8
    >= 0.10         |   3.5   4.3   4.5   5.1   3.8   1.4   0.4   0.9   1.6   2.0   5.5   4.5 |   37.5
    >= 0.25         |   1.3   0.8   1.2   1.7   2.0   0.4   0.2   0.6   0.5   1.3   1.8   1.4 |   13.1
    >= 0.50         |   0.3   0.3   0.2   0.1   0.4   0.2   0.1   0.0   0.1   0.3   0.6   0.4 |    3.0
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.1   0.1 |    0.3
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.6   5.2   6.0   6.8   6.6   6.3   5.6   5.2   4.4   4.2   4.2   4.7 |    5.3
Daily Avg Max 2-Min |  15.2  16.2  18.9  20.1  19.9  20.1  20.1  19.3  17.2  15.3  14.7  15.4 |   17.7
Daily Avg Peak Gust |  18.4  20.1  23.5  25.4  25.5  25.8  25.6  24.8  22.2  19.3  18.4  19.0 |   22.3
                    |                                                                         |
Maximum Daily Avg   |  18.3  20.1  22.1  17.9  16.0  14.0  11.5  11.4  12.3  14.0  19.9  22.0 |   22.1
                    |                                                                         |
Maximum 2-Minute Avg|    41    43    37    45    38    40    51    32    40    32    43    49 |     51
                    |                                                                         |
Date of Max 2min-Day|    01    17    13    15    18    26    13    18    28    14    23    14 |
               -Year|  2004  2004  2003  2006  2005  2006  1999  1999  2007  2005  1998  2002 |
                    |                                                                         |
Maximum Peak Gust   |    60    54    47    55    47    52    69    44    47    39    56    60 |     69
                    |                                                                         |
Date of Max Gust-Day|    01    17    13    15    18    26    13    31    08    27    23    14 |
               -Year|  2004  2004  2003  2006  2005  2006  1999  2007  1998  1999  1998  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   3.7   4.0   7.4   8.4   8.1   7.7   7.1   6.5   4.5   2.9   3.7   5.5 |   69.6
   Peak Gust >=40   |   0.9   0.8   1.2   1.0   0.6   0.4   0.5   0.7   0.6   0.0   0.7   1.7 |    9.2
   Peak Gust >=50   |   0.3   0.1   0.0   0.1   0.0   0.1   0.1   0.0   0.0   0.0   0.2   0.3 |    1.1
                    |                                                                         |
   Max 2-Minute >=30|   1.4   1.3   2.8   1.4   0.7   0.9   0.8   0.8   0.8   0.5   0.8   0.0 |   12.3
   Max 2-Minute >=40|   0.3   0.2   0.0   0.1   0.0   0.1   0.1   0.0   0.1   0.0   0.2   0.0 |    1.1
                    |                                                                         |
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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.