STATION:  ARCATA AIRPORT (KACV), CA

CLIMATOLOGICAL SUMMARY.  Period of Record: Jul 1996 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        |  55.4  55.7  55.8  56.4  60.2  62.2  63.4  63.8  63.8  62.4  58.7  55.8 |   59.5
Avg Min Temp        |  39.9  39.7  39.9  41.5  45.4  47.9  51.3  51.1  47.1  43.7  42.8  39.9 |   44.2
Avg Temperature     |  47.7  47.7  47.8  48.9  52.8  55.1  57.3  57.5  55.5  53.1  50.7  47.8 |   51.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    75    75    76    79    94    83    82    86    88    91    79    78 |     94
                    |                                                                         |
    Date of Ext-Day |    06    02    31    01    15    14    08    28    18    25    26    20 |
               -Year|  2003  2000  2000  2000  2008  2000  2008  2008  2000  2003  2002  1999 |
                    |                                                                         |
    Extreme Min Temp|    23    27    28    30    30    36    43    41    38    29    27    22 |     22
                    |                                                                         |
    Date of Ext-Day |    13    08    29    04    09    08    26    05    30    31    28    17 |
               -Year|  2007  2001  2008  2001  1999  1999  2001  2002  2002  2002  2004  2005 |
                    |                                                                         |
Heating Degree Days |   537   488   532   483   380   298   238   234   287   371   428   532 |   4807
Cooling Degree Days |     0     0     0     0     1     0     0     0     1     1     0     0 |      5
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.1   0.0   0.0 |    0.2
    Max Temp >= 75  |   0.2   0.2   0.1   0.4   0.8   0.5   0.3   0.4   1.7   1.8   0.4   0.1 |    6.9
    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  |   4.9   3.3   2.7   1.0   0.2   0.0   0.0   0.0   0.0   0.3   1.6   4.4 |   18.4
    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  |  41.4  41.7  43.0  43.7  47.6  49.8  52.5  52.6  49.8  47.2  44.9  42.4 |   46.4
Avg Wet Bulb Temp   |  44.2  44.4  45.6  46.2  49.9  52.0  54.2  54.2  51.9  49.4  47.4  44.9 |   48.7
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.16 30.11 30.15 30.08 30.07 30.06 30.02 30.01 30.00 30.06 30.13 30.13 |  30.08
(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   |   0.9   0.6   0.2   0.1   0.2   0.0   0.0   0.1   0.2   0.2   0.4   0.5 |    3.2
    Heavy Fog       |   3.0   2.0   4.1   2.2   3.4   5.8   6.8   9.7  10.0   7.2   4.4   2.8 |   61.3
    Fog             |  14.2  14.6  18.1  16.1  14.0  16.8  17.8  18.2  16.8  18.5  16.4  15.2 |  196.7
    Hail            |   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  6.25  7.02  4.86  4.26  1.78  0.76  0.13  0.26  0.34  2.54  6.52  8.69 |  43.41
                    |                                                                         |
Maximum Daily       |  1.89  2.71  2.12  1.72  1.12  1.01  0.69  0.47  0.59  2.67  4.73  6.29 |   6.29
                    |                                                                         |
    Date of Ext-Day |    14    19    24    08    08    17    17    04    30    19    21    27 |
               -Year|  2000  2002  1999  2005  2005  2005  2007  2003  2007  2007  1998  2002 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  16.5  17.3  15.2  15.9  10.8   6.6   4.5   7.2   9.4  13.3  18.7  18.2 |  153.7
    >= 0.10         |  10.8  11.2   9.7   9.2   4.5   1.6   0.2   0.6   0.9   4.6  10.7  11.8 |   75.8
    >= 0.25         |   7.3   8.2   7.1   6.0   2.8   0.9   0.1   0.3   0.3   2.8   8.2   8.7 |   52.8
    >= 0.50         |   5.0   5.3   4.0   2.7   1.1   0.4   0.1   0.0   0.1   2.0   4.6   6.5 |   31.9
    >= 1.00         |   2.2   1.9   1.0   0.9   0.1   0.2   0.0   0.0   0.0   0.4   1.7   2.8 |   11.2
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.8   6.0   6.5   6.4   6.7   6.6   5.4   4.9   4.4   4.4   5.0   6.7 |    5.7
Daily Avg Max 2-Min |  16.1  16.3  17.9  17.1  17.4  17.1  14.6  13.8  13.7  14.1  15.0  18.0 |   15.9
Daily Avg Peak Gust |  20.4  20.3  22.1  20.9  21.4  21.4  18.3  17.3  16.9  17.4  19.0  23.2 |   19.9
                    |                                                                         |
Maximum Daily Avg   |  19.9  17.0  18.1  14.5  15.3  15.3  11.6  12.3  11.7  15.1  16.2  19.2 |   19.9
                    |                                                                         |
Maximum 2-Minute Avg|    38    40    39    33    32    32    28    29    31    33    40    46 |     46
                    |                                                                         |
Date of Max 2min-Day|    04    25    05    16    02    08    15    31    02    19    19    31 |
               -Year|  2008  2004  2006  2001  2001  2002  2008  2008  2004  2004  2001  2005 |
                    |                                                                         |
Maximum Peak Gust   |    54    58    53    45    40    46    47    38    41    46    55    58 |     58
                    |                                                                         |
Date of Max Gust-Day|    04    25    05    19    22    18    15    31    02    19    19    31 |
               -Year|  2008  2004  2006  2004  2008  2007  2008  2008  2004  2004  2001  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.3   4.5   5.0   2.5   3.1   3.0   1.2   1.0   2.1   2.7   4.1   9.4 |   43.9
   Peak Gust >=40   |   0.7   1.1   1.8   0.1   0.1   0.4   0.1   0.0   0.1   0.3   0.6   2.8 |    8.2
   Peak Gust >=50   |   0.1   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.3   0.5 |    1.2
                    |                                                                         |
   Max 2-Minute >=30|   1.0   1.5   1.6   0.5   0.6   0.1   0.0   0.0   0.3   0.3   0.9   0.0 |    6.8
   Max 2-Minute >=40|   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.1   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.