STATION:  HERMISTON MUNICIPAL ARPT (KHRI), OR

CLIMATOLOGICAL SUMMARY.  Period of Record: Mar 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        |  43.1  49.4  58.6  65.3  74.2  81.9  92.1  89.8  80.0  65.2  50.2  41.4 |   65.9
Avg Min Temp        |  28.5  27.2  32.6  36.6  44.8  51.1  57.8  55.3  46.1  36.7  30.9  27.4 |   39.6
Avg Temperature     |  35.8  38.3  45.6  50.9  59.5  66.5  75.0  72.6  63.1  51.0  40.6  34.4 |   52.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    67    67    79    90   100   105   109   110    99    87    78    70 |    110
                    |                                                                         |
    Date of Ext-Day |    07    21    30    30    18    30    27    04    01    21    06    03 |
               -Year|  2002  2002  2003  1998  2006  2008  1998  1998  1998  2003  2006  2007 |
                    |                                                                         |
    Extreme Min Temp|    -7     2    15    16    25    38    41    40    26     7     8   -16 |    -16
                    |                                                                         |
    Date of Ext-Day |    04    18    02    01    10    01    05    28    23    31    01    16 |
               -Year|  2004  2006  2002  2008  1999  2004  1999  2000  2000  2002  2002  2008 |
                    |                                                                         |
Heating Degree Days |   906   754   601   422   199    49     4     7   106   436   732   949 |   5164
Cooling Degree Days |     0     0     0     0    28    94   313   242    48     1     0     0 |    725
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.1   2.1   5.6  20.5  17.0   3.2   0.0   0.0   0.0 |   48.5
    Max Temp >= 75  |   0.0   0.0   0.7   3.5  13.7  24.2  30.5  30.3  22.1   3.3   0.1   0.0 |  128.4
    Max Temp <= 32  |   3.6   0.4   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.7   5.6 |   10.3
                    |                                                                         |
    Min Temp <= 32  |  20.9  20.8  15.4   8.1   1.7   0.0   0.0   0.0   0.6   9.7  17.6  22.2 |  116.9
    Min Temp <= 20  |   4.3   6.4   1.2   0.2   0.0   0.0   0.0   0.0   0.0   1.2   3.8   4.9 |   22.0
    Min Temp  <= 0  |   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.7 |    0.8
                    |                                                                         |
Avg Dew Point Temp  |  30.3  30.1  33.3  36.4  42.2  45.5  47.7  48.0  43.5  38.3  34.2  29.6 |   38.3
Avg Wet Bulb Temp   |  33.7  34.9  40.4  44.3  50.9  55.4  59.9  58.9  52.8  44.7  38.0  32.7 |   45.5
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.18 30.15 30.06 30.01 29.99 29.95 29.92 29.92 29.97 30.08 30.16 30.21 |  30.05
(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   |   0.0   0.1   0.0   0.5   0.5   0.5   0.9   0.9   0.1   0.1   0.0   0.0 |    3.6
    Heavy Fog       |   5.0   2.3   0.9   0.2   0.0   0.2   0.1   0.0   0.4   0.5   4.2   5.2 |   18.9
    Fog             |  17.9  13.2   5.7   4.9   3.9   3.2   0.3   0.7   1.7   5.8  15.9  18.4 |   91.6
    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     |  1.03  0.75  0.56  0.73  0.80  0.70  0.05  0.13  0.28  0.67  1.02  1.11 |   7.82
                    |                                                                         |
Maximum Daily       |  0.74  0.48  0.56  0.67  0.47  0.80  0.18  0.21  0.59  0.74  0.76  0.70 |   0.80
                    |                                                                         |
    Date of Ext-Day |    27    26    25    23    30    08    08    25    08    10    08    30 |
               -Year|  2008  2000  2006  2005  2000  2004  2005  2004  2003  2000  2000  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   9.3   6.7   6.4   6.2   8.2   4.4   1.4   1.8   2.6   6.4  11.5  11.2 |   76.1
    >= 0.10         |   3.3   2.6   1.8   2.3   2.9   2.5   0.1   0.5   0.9   2.1   3.3   3.6 |   25.9
    >= 0.25         |   1.5   0.6   0.3   0.8   0.8   0.8   0.0   0.0   0.4   0.8   0.9   1.3 |    8.2
    >= 0.50         |   0.1   0.0   0.1   0.3   0.0   0.2   0.0   0.0   0.1   0.3   0.2   0.3 |    1.5
    >= 1.00         |   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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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   5.9   6.4   8.3   8.2   8.9   9.4   8.4   7.8   6.6   6.3   5.9   5.8 |    7.3
Daily Avg Max 2-Min |  15.4  16.6  19.6  19.1  19.7  19.3  18.2  17.4  15.2  14.9  15.0  15.6 |   17.2
Daily Avg Peak Gust |  18.8  20.2  24.1  23.7  24.9  24.4  22.9  22.0  19.0  18.8  18.4  19.1 |   21.4
                    |                                                                         |
Maximum Daily Avg   |  21.9  22.7  24.1  21.5  24.2  21.9  22.4  18.6  22.2  23.5  19.2  22.5 |   24.2
                    |                                                                         |
Maximum 2-Minute Avg|    46    45    44    44    41    49    43    36    41    43    37    43 |     49
                    |                                                                         |
Date of Max 2min-Day|    30    06    13    15    09    24    12    30    25    28    04    02 |
               -Year|  2004  1999  2001  2006  2000  1999  2001  2007  1999  2003  2000  1999 |
                    |                                                                         |
Maximum Peak Gust   |    58    54    53    54    49    60    48    48    49    52    49    55 |     60
                    |                                                                         |
Date of Max Gust-Day|    30    02    13    27    09    24    12    30    25    28    04    14 |
               -Year|  2004  1999  2001  2004  2000  1999  2001  2007  1999  2003  2000  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.1   4.8   9.8   7.1   8.5   6.9   6.2   5.2   3.0   4.3   5.7   5.3 |   71.9
   Peak Gust >=40   |   1.3   1.4   2.1   1.5   1.2   0.9   0.6   0.4   0.2   0.7   1.0   2.1 |   13.3
   Peak Gust >=50   |   0.4   0.5   0.1   0.2   0.0   0.2   0.0   0.0   0.0   0.1   0.0   0.2 |    1.6
                    |                                                                         |
   Max 2-Minute >=30|   2.1   1.9   3.4   2.5   2.8   1.7   1.0   1.0   0.8   1.3   1.8   0.0 |   20.5
   Max 2-Minute >=40|   0.4   0.6   0.2   0.3   0.2   0.1   0.1   0.0   0.1   0.2   0.0   0.0 |    2.1
                    |                                                                         |
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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.