STATION:  SAN LUIS OBISPO REGIONAL ARPT (KSBP), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Apr 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        |  63.6  63.8  66.0  67.3  71.8  75.0  78.0  78.6  78.3  75.7  70.3  64.7 |   71.1
Avg Min Temp        |  39.9  41.7  43.3  44.2  47.6  50.6  54.2  54.3  53.1  48.8  44.6  39.6 |   46.8
Avg Temperature     |  51.7  52.8  54.6  55.8  59.7  62.8  66.1  66.4  65.7  62.2  57.5  52.2 |   59.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    85    87    90   100    99   113    99    96   105   100    93    82 |    113
                    |                                                                         |
    Date of Ext-Day |    31    09    12    26    02    20    15    30    02    07    15    16 |
               -Year|  2003  2006  2007  2004  2004  2008  1998  2005  2007  2008  2008  1998 |
                    |                                                                         |
    Extreme Min Temp|    21    27    31    30    35    38    44    45    43    38    28    22 |     21
                    |                                                                         |
    Date of Ext-Day |    14    01    04    04    15    07    04    15    27    30    13    22 |
               -Year|  2007  2002  2002  1999  1999  1999  1999  1999  1998  1998  2000  1998 |
                    |                                                                         |
Heating Degree Days |   412   346   324   283   179    90    24    14    39   119   236   398 |   2463
Cooling Degree Days |     0     1     3     6    14    24    58    59    61    32     9     0 |    268
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.1   0.6   1.1   0.9   1.4   1.0   2.8   3.3   0.5   0.0 |   11.7
    Max Temp >= 75  |   2.8   3.1   4.1   5.0   8.0  13.6  21.6  24.7  19.9  14.1   8.0   3.5 |  128.4
    Max Temp <= 32  |   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
                    |                                                                         |
    Min Temp <= 32  |   3.7   1.6   0.5   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.9   3.6 |   10.5
    Min Temp <= 20  |   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
    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   0.0 |    0.0
                    |                                                                         |
Avg Dew Point Temp  |  40.5  42.9  44.6  45.4  48.6  50.9  53.5  54.0  52.3  47.1  44.3  39.4 |   47.0
Avg Wet Bulb Temp   |  46.0  47.6  49.0  49.9  53.0  55.3  57.6  58.0  57.1  53.1  50.0  45.6 |   51.9
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.13 30.08 30.06 30.03 29.98 29.94 29.95 29.94 29.91 29.98 30.08 30.14 |  30.02
(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   |   1.1   2.0   1.4   1.6   0.7   0.3   0.8   0.6   0.8   0.8   0.6   0.5 |   11.3
    Heavy Fog       |   4.5   2.9   3.2   3.4   2.5   3.0   1.9   3.4   5.4   5.8   5.0   3.3 |   44.3
    Fog             |  14.1  14.6  14.4  13.4  14.8  16.6  15.7  18.4  15.6  14.8  12.8  11.5 |  176.7
    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     |  3.55  3.64  2.15  1.62  0.66  0.03  0.00  0.01  0.06  0.80  1.52  2.78 |  16.82
                    |                                                                         |
Maximum Daily       |  2.75  2.19  2.18  2.05  1.58  0.23  0.00  0.04  0.20  1.79  2.06  2.40 |   2.75
                    |                                                                         |
    Date of Ext-Day |    02    25    22    17    21    08          15    04    19    04    18 |
               -Year|  2006  2004  2005  2000  2006  2000        2008  1998  2004  2004  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   9.4  11.8   8.7   7.2   3.0   0.7   0.0   0.8   1.6   5.6   7.9   9.4 |   66.2
    >= 0.10         |   5.0   6.8   4.3   3.0   1.3   0.1   0.0   0.0   0.3   1.6   2.5   4.1 |   28.9
    >= 0.25         |   3.6   4.5   2.3   1.8   0.8   0.0   0.0   0.0   0.0   0.9   1.7   2.6 |   18.3
    >= 0.50         |   2.4   2.6   1.2   0.8   0.5   0.0   0.0   0.0   0.0   0.3   1.0   1.6 |   10.5
    >= 1.00         |   1.1   1.0   0.5   0.4   0.1   0.0   0.0   0.0   0.0   0.2   0.5   0.8 |    4.5
                    |                                                                         |
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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   8.1   8.6   8.0   7.1   6.9   6.6   5.9   5.5   5.2 |    6.7
Daily Avg Max 2-Min |  17.0  18.1  20.2  21.3  21.6  19.9  17.9  17.9  18.2  18.7  17.6  17.4 |   18.8
Daily Avg Peak Gust |  20.6  21.9  24.1  25.6  25.7  23.5  21.1  20.8  21.6  22.2  21.3  21.2 |   22.5
                    |                                                                         |
Maximum Daily Avg   |  17.3  16.4  19.2  18.9  18.9  16.3  15.6  14.3  14.9  14.5  13.8  16.2 |   19.2
                    |                                                                         |
Maximum 2-Minute Avg|    36    38    39    47    35    31    30    29    32    30    36    40 |     47
                    |                                                                         |
Date of Max 2min-Day|    02    23    13    03    10    06    24    30    04    01    24    16 |
               -Year|  2006  2008  2002  1999  2004  2007  1999  1999  2007  2007  2001  2002 |
                    |                                                                         |
Maximum Peak Gust   |    49    51    46    56    43    40    38    40    39    45    47    52 |     56
                    |                                                                         |
Date of Max Gust-Day|    27    23    04    03    10    06    17    16    04    05    24    16 |
               -Year|  2008  2008  2001  1999  2004  2007  2008  2007  2007  2008  2001  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.9   2.9   5.5   9.1   9.8   5.4   2.3   1.6   3.7   3.3   2.3   3.6 |   52.3
   Peak Gust >=40   |   0.5   0.2   0.6   0.2   0.1   0.1   0.0   0.1   0.0   0.3   0.2   0.6 |    2.9
   Peak Gust >=50   |   0.0   0.1   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.3
                    |                                                                         |
   Max 2-Minute >=30|   0.6   0.6   0.9   1.7   1.3   0.6   0.1   0.0   0.3   0.2   0.3   0.0 |    6.5
   Max 2-Minute >=40|   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
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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.