STATION:  HILO INTERNATIONAL AIRPORT (PHTO), HI

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        |  79.3  78.9  79.8  79.3  81.3  82.5  83.6  83.9  83.4  82.9  81.2  79.5 |   81.3
Avg Min Temp        |  63.7  63.6  64.9  65.6  66.6  68.1  69.1  69.5  68.8  68.2  67.0  65.1 |   66.7
Avg Temperature     |  71.5  71.2  72.4  72.4  73.9  75.3  76.3  76.7  76.1  75.6  74.1  72.3 |   74.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    92    86    88    85    91    88    91    89    89    90    92    87 |     92
                    |                                                                         |
    Date of Ext-Day |    28    14    01    10    25    02    17    24    07    01    07    27 |
               -Year|  1997  2004  2004  2002  2003  2007  2004  1996  2004  1996  1996  1996 |
                    |                                                                         |
    Extreme Min Temp|    57    57    59    58    60    63    63    64    63    62    60    59 |     57
                    |                                                                         |
    Date of Ext-Day |    01    07    05    05    25    16    28    01    23    19    22    29 |
               -Year|  2001  2001  2005  2008  2003  1999  1999  1999  2006  1999  2003  1999 |
                    |                                                                         |
Heating Degree Days |     0     0     0     0     0     0     0     0     0     0     0     0 |      0
Cooling Degree Days |   201   176   228   223   277   308   352   362   333   328   272   227 |   3288
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.2   0.0   0.0   0.0   0.1   0.0   0.2   0.0   0.0   0.2   0.1   0.0 |    0.7
    Max Temp >= 75  |  28.3  25.3  28.8  28.9  30.5  30.0  31.0  31.0  30.0  30.9  29.6  29.5 |  353.9
    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  |   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 <= 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  |  62.6  62.1  63.5  64.1  64.9  66.2  67.6  68.2  67.5  67.1  66.3  64.3 |   65.4
Avg Wet Bulb Temp   |  65.6  65.2  66.4  66.9  67.9  69.0  70.2  70.7  70.1  69.5  68.7  66.9 |   68.1
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.02 30.06 30.06 30.09 30.07 30.05 30.04 30.03 30.00 30.01 30.02 30.04 |  30.04
(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   |   0.8   1.1   0.8   0.3   0.2   0.0   0.1   0.1   0.2   1.0   1.2   0.7 |    6.3
    Heavy Fog       |   0.3   0.1   0.2   0.0   0.0   0.0   0.0   0.0   0.3   0.2   0.3   0.2 |    1.6
    Fog             |  13.6  12.5  15.4  22.2  16.7  19.8  17.3  17.0  17.2  17.3  15.0  13.7 |  197.7
    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     |  9.13 12.69 11.65 10.58  8.03  7.73  8.85  7.68  8.87 10.31 12.14 11.49 | 119.14
                    |                                                                         |
Maximum Daily       |  4.78 10.83  8.94  7.82  4.27  3.39  4.68  2.37  5.93  4.97  6.80 10.13 |  10.83
                    |                                                                         |
    Date of Ext-Day |    13    02    22    12    06    26    30    23    15    07    27    26 |
               -Year|  2000  2008  2004  2004  2006  1997  1997  2002  2005  1997  2001  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  17.4  18.1  20.6  26.0  22.8  24.8  26.2  26.5  25.1  24.4  22.8  22.1 |  276.8
    >= 0.10         |  11.7  11.7  13.7  18.8  13.5  16.4  18.4  17.2  16.8  17.7  16.3  14.8 |  186.9
    >= 0.25         |   7.7   8.4  10.4  11.7   7.2   9.7  10.7   9.9  10.8  11.5  10.9  10.3 |  119.3
    >= 0.50         |   5.5   5.6   6.8   6.6   3.8   4.2   4.9   4.7   4.9   6.7   7.1   6.8 |   67.5
    >= 1.00         |   2.8   3.0   3.6   2.3   1.8   1.5   1.6   1.2   1.5   2.3   3.5   3.2 |   28.3
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   6.3   6.7   6.7   6.7   6.5   6.3   6.3   6.1   6.0   5.8   5.9   6.0 |    6.3
Daily Avg Max 2-Min |  15.6  16.4  16.6  16.5  15.4  15.3  14.9  14.7  14.7  14.5  14.3  14.8 |   15.3
Daily Avg Peak Gust |  19.6  20.7  20.8  20.5  19.5  19.0  19.0  18.6  18.4  18.3  18.3  18.8 |   19.3
                    |                                                                         |
Maximum Daily Avg   |  11.7  15.9  14.1  13.8  11.4  10.4  10.5   8.9   8.2  11.1  14.1  12.7 |   15.9
                    |                                                                         |
Maximum 2-Minute Avg|    31    37    29    26    23    24    24    24    24    24    25    29 |     37
                    |                                                                         |
Date of Max 2min-Day|    20    08    05    26    01    20    12    23    01    27    20    05 |
               -Year|  2003  2006  2002  2004  1999  2001  2004  1998  2003  2001  2003  2007 |
                    |                                                                         |
Maximum Peak Gust   |    38    51    36    32    29    28    30    32    30    31    37    39 |     51
                    |                                                                         |
Date of Max Gust-Day|    20    24    05    11    17    20    15    23    26    27    01    05 |
               -Year|  2003  1997  2002  2001  1999  2001  2004  1998  2005  2001  1997  2007 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.0   1.9   1.2   0.5   0.0   0.0   0.1   0.1   0.1   0.2   0.5   0.7 |    6.4
   Peak Gust >=40   |   0.0   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.2
   Peak Gust >=50   |   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
                    |                                                                         |
   Max 2-Minute >=30|   0.2   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.5
   Max 2-Minute >=40|   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
                    |                                                                         |
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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.