STATION:  SOUTH LAKE TAHOE AIRPORT (KTVL), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Oct 2000 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        |  40.0  41.5  47.8  51.0  63.6  72.9  81.2  79.3  72.3  60.8  49.3  41.8 |   58.5
Avg Min Temp        |  15.1  17.3  22.5  26.6  32.7  37.0  43.8  41.3  34.2  28.6  23.0  18.2 |   28.4
Avg Temperature     |  27.6  29.4  35.2  38.8  48.2  55.0  62.5  60.3  53.3  44.7  36.1  30.0 |   43.4
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    57    60    67    72    84    87    91    90    84    79    66    73 |     91
                    |                                                                         |
    Date of Ext-Day |    31    22    20    28    28    23    11    15    03    01    07    20 |
               -Year|  2003  2002  2004  2007  2003  2006  2002  2008  2007  2001  2006  2008 |
                    |                                                                         |
    Extreme Min Temp|   -13    -8     1     8    20    26    32    30    22    11    -5   -11 |    -13
                    |                                                                         |
    Date of Ext-Day |    04    05    01    10    09    07    04    21    16    28    29    17 |
               -Year|  2004  2008  2001  2001  2003  2005  2003  2002  2006  2004  2004  2008 |
                    |                                                                         |
Heating Degree Days |  1160  1006   925   786   522   301    99   151   352   629   866  1085 |   7882
Cooling Degree Days |     0     0     0     0     0     0    21     5     0     0     0     0 |     27
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.0   0.0   0.6   0.2   0.0   0.0   0.0   0.0 |    0.9
    Max Temp >= 75  |   0.0   0.0   0.0   0.0   4.3  15.8  28.2  25.8  14.2   0.9   0.0   0.0 |   89.1
    Max Temp <= 32  |   5.7   3.8   1.9   1.0   0.0   0.0   0.0   0.0   0.0   0.1   1.6   4.0 |   18.1
                    |                                                                         |
    Min Temp <= 32  |  31.0  27.2  30.0  26.2  16.1   5.8   0.4   1.2  11.7  25.0  27.6  29.0 |  231.2
    Min Temp <= 20  |  21.4  18.1   9.9   4.0   0.1   0.0   0.0   0.0   0.0   2.2  10.1  18.4 |   84.3
    Min Temp  <= 0  |   2.4   0.9   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   1.5 |    5.0
                    |                                                                         |
Avg Dew Point Temp  |  18.6  19.9  22.6  24.9  30.8  32.8  38.0  35.6  30.3  26.5  23.5  20.9 |   27.0
Avg Wet Bulb Temp   |  24.1  25.6  29.9  32.9  40.2  44.5  49.9  47.9  42.2  35.6  30.3  26.3 |   35.8
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.19 30.10 30.09 30.00 30.00 30.00 30.04 30.03 30.04 30.09 30.15 30.14 |  30.07
(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   |   0.1   0.0   0.1   0.6   1.9   2.2   3.5   2.0   1.0   0.6   0.0   0.2 |   12.3
    Heavy Fog       |   5.0   3.9   4.7   4.0   1.0   0.5   0.0   0.4   0.1   0.8   1.6   4.7 |   26.6
    Fog             |  14.7  13.5  10.5  10.4   4.6   2.2   0.6   1.2   1.0   4.2   8.7  14.7 |   86.5
    Hail            |   0.0   0.0   0.0   0.0   0.0   0.1   0.2   0.0   0.0   0.0   0.0   0.0 |    0.4
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  1.82  2.25  1.44  1.22  0.81  0.16  0.36  0.30  0.17  1.09  1.56  3.17 |  14.37
                    |                                                                         |
Maximum Daily       |  2.04  1.70  1.15  1.21  0.83  0.18  0.76  0.78  0.32  1.15  1.22  2.14 |   2.14
                    |                                                                         |
    Date of Ext-Day |    04    27    19    13    18    29    31    15    25    26    27    30 |
               -Year|  2008  2006  2005  2003  2005  2004  2003  2005  2001  2004  2004  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   9.0   8.8   7.6   8.8   6.0   1.9   1.5   1.4   1.5   5.4   7.0  11.5 |   70.5
    >= 0.10         |   3.8   6.0   3.9   3.5   2.4   0.5   0.8   0.8   0.6   2.5   3.9   6.3 |   34.9
    >= 0.25         |   2.5   2.4   1.8   1.4   0.9   0.0   0.6   0.4   0.2   1.5   1.9   4.0 |   17.6
    >= 0.50         |   0.9   1.5   0.6   0.6   0.3   0.0   0.4   0.2   0.0   0.6   0.9   2.1 |    8.1
    >= 1.00         |   0.4   0.5   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.3   0.8 |    2.4
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.9   5.0   5.9   6.7   5.7   5.6   4.9   5.0   4.8   4.7   5.0   5.9 |    5.3
Daily Avg Max 2-Min |  15.7  15.8  17.5  18.5  17.4  17.8  17.1  17.0  16.2  15.3  15.5  17.4 |   16.8
Daily Avg Peak Gust |  21.0  21.2  23.3  25.1  23.8  24.3  23.1  23.3  22.4  21.0  21.5  23.7 |   22.8
                    |                                                                         |
Maximum Daily Avg   |  18.7  20.1  19.4  20.3  18.6  15.2  11.3  12.9  15.1  16.8  20.0  25.2 |   25.2
                    |                                                                         |
Maximum 2-Minute Avg|    40    40    38    38    38    37    26    29    36    38    38    46 |     46
                    |                                                                         |
Date of Max 2min-Day|    03    17    05    29    18    16    30    29    25    26    11    26 |
               -Year|  2008  2004  2006  2008  2005  2005  2001  2005  2001  2004  2006  2006 |
                    |                                                                         |
Maximum Peak Gust   |    59    54    58    59    52    54    37    40    53    54    60    63 |     63
                    |                                                                         |
Date of Max Gust-Day|    03    25    01    29    20    07    09    29    25    29    11    26 |
               -Year|  2008  2007  2008  2008  2005  2004  2001  2005  2001  2003  2006  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   7.6   6.0   7.2   8.4   5.8   5.5   3.6   4.4   5.5   5.2   7.9  10.0 |   77.2
   Peak Gust >=40   |   2.8   1.6   2.0   2.9   0.9   1.0   0.0   0.1   1.5   1.6   2.7   4.9 |   22.0
   Peak Gust >=50   |   0.5   0.4   0.8   0.3   0.3   0.1   0.0   0.0   0.1   0.2   0.4   1.3 |    4.4
                    |                                                                         |
   Max 2-Minute >=30|   1.6   1.4   2.4   2.4   0.9   0.8   0.0   0.0   1.0   1.2   1.7   0.0 |   13.3
   Max 2-Minute >=40|   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.3
                    |                                                                         |
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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.