STATION:  LIVERMORE MUNICIPAL ARPT (KLVK), 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        |  56.4  60.0  65.3  68.1  75.2  82.0  87.2  87.4  84.4  76.3  64.9  57.5 |   72.1
Avg Min Temp        |  37.2  39.2  41.3  43.8  49.1  53.3  56.7  56.8  54.5  48.6  42.4  37.5 |   46.7
Avg Temperature     |  46.8  49.6  53.3  56.0  62.2  67.7  72.0  72.1  69.4  62.5  53.6  47.5 |   59.4
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    68    75    84    93   104   107   109   109   104    98    82    70 |    109
                    |                                                                         |
    Date of Ext-Day |    15    22    18    26    31    14    10    03    02    01    04    21 |
               -Year|  2000  2002  2004  2004  2001  2000  2002  1998  1998  2001  2001  1999 |
                    |                                                                         |
    Extreme Min Temp|    20    23    28    31    37    44    48    48    42    34    26    21 |     20
                    |                                                                         |
    Date of Ext-Day |    14    08    08    09    09    09    02    07    30    31    30    24 |
               -Year|  2007  2003  2002  1999  2003  1999  2003  2002  2007  2002  2004  1998 |
                    |                                                                         |
Heating Degree Days |   565   436   362   277   132    32     6     3    20   109   341   542 |   2825
Cooling Degree Days |     0     0     1     6    45   113   221   222   153    31     0     0 |    792
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.4   3.4   7.0  12.1  13.3   9.7   2.3   0.0   0.0 |   48.2
    Max Temp >= 75  |   0.0   0.3   4.1   6.9  14.9  22.4  28.2  28.9  24.4  17.2   3.0   0.0 |  150.3
    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  |   7.8   3.3   1.5   0.4   0.0   0.0   0.0   0.0   0.0   0.0   1.9   7.8 |   22.7
    Min Temp <= 20  |   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
    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  |  39.5  41.0  42.7  43.4  47.1  49.6  53.1  52.4  49.3  44.4  42.7  38.8 |   45.3
Avg Wet Bulb Temp   |  43.2  45.4  47.9  49.3  53.5  56.8  60.0  59.6  57.4  52.2  47.8  43.4 |   51.4
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.15 30.08 30.07 30.03 29.97 29.92 29.92 29.91 29.89 29.99 30.10 30.15 |  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   |   1.3   0.9   0.5   0.6   0.2   0.4   0.9   1.6   0.6   0.9   1.0   0.8 |    9.8
    Heavy Fog       |   5.1   2.2   0.9   0.1   0.0   0.0   0.0   0.0   0.0   0.4   3.0   3.5 |   15.3
    Fog             |  19.9  16.8  11.6   7.5   6.1   2.4   4.1   4.7   5.7   7.4  15.1  17.6 |  118.9
    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     |  2.36  2.88  1.62  1.18  0.67  0.04  0.00  0.01  0.09  0.77  1.57  3.07 |  14.25
                    |                                                                         |
Maximum Daily       |  2.32  1.15  0.78  1.14  0.72  0.14  0.01  0.06  0.23  1.39  1.66  2.76 |   2.76
                    |                                                                         |
    Date of Ext-Day |    04    22    22    12    02    07    21    25    22    19    08    16 |
               -Year|  2008  2000  2005  2003  2003  2000  2005  2003  2007  2004  2002  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  14.3  14.2  10.5   6.9   3.5   0.7   0.1   0.2   1.0   4.0  10.6  12.1 |   78.2
    >= 0.10         |   5.0   7.7   5.4   3.2   2.0   0.2   0.0   0.0   0.4   1.7   3.6   6.5 |   35.7
    >= 0.25         |   2.8   4.3   2.4   1.8   1.1   0.0   0.0   0.0   0.0   0.9   2.0   3.6 |   19.0
    >= 0.50         |   1.2   1.8   0.7   0.5   0.3   0.0   0.0   0.0   0.0   0.5   0.9   2.0 |    7.8
    >= 1.00         |   0.3   0.4   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.3   0.5 |    1.7
                    |                                                                         |
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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   5.2   5.7   7.0   8.1   8.8   8.8   8.0   6.5   5.3   4.3   4.9 |    6.5
Daily Avg Max 2-Min |  15.3  16.1  16.8  18.1  18.6  19.6  18.9  18.2  17.0  15.8  14.3  15.7 |   17.0
Daily Avg Peak Gust |  18.7  19.7  20.2  21.9  22.1  23.2  22.0  21.3  20.1  19.2  17.4  19.3 |   20.4
                    |                                                                         |
Maximum Daily Avg   |  15.8  15.0  16.8  15.1  16.3  15.4  14.3  13.7  14.7  18.6  14.6  18.0 |   18.6
                    |                                                                         |
Maximum 2-Minute Avg|    33    33    35    33    32    30    25    26    28    32    45    36 |     45
                    |                                                                         |
Date of Max 2min-Day|    07    22    26    17    02    02    15    20    19    22    24    16 |
               -Year|  2005  2002  2007  2007  2001  1999  2001  2001  2007  2000  2001  2002 |
                    |                                                                         |
Maximum Peak Gust   |    52    46    41    40    43    36    30    30    33    46    52    47 |     52
                    |                                                                         |
Date of Max Gust-Day|    04    25    26    17    02    02    15    25    19    22    24    16 |
               -Year|  2008  2004  2007  2007  2001  1999  2001  1998  2007  2000  2001  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.2   2.7   2.6   2.5   1.4   0.6   0.3   0.5   0.3   0.8   0.9   2.8 |   17.6
   Peak Gust >=40   |   0.5   0.5   0.1   0.1   0.3   0.0   0.0   0.0   0.0   0.3   0.1   0.5 |    2.3
   Peak Gust >=50   |   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0 |    0.2
                    |                                                                         |
   Max 2-Minute >=30|   0.4   0.8   0.4   0.5   0.2   0.1   0.0   0.0   0.0   0.2   0.2   0.0 |    2.7
   Max 2-Minute >=40|   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   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.