STATION:  ONTARIO MUNICIPAL AIRPORT (KONO), OR

CLIMATOLOGICAL SUMMARY.  Period of Record: Jul 1997 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        |  37.1  44.3  56.3  63.9  73.9  83.2  94.2  90.9  80.1  65.1  48.7  37.4 |   64.6
Avg Min Temp        |  23.9  25.9  32.3  37.2  46.0  53.1  61.0  56.8  47.2  36.9  29.0  24.1 |   39.4
Avg Temperature     |  30.5  35.1  44.3  50.5  59.9  68.2  77.6  73.9  63.6  51.0  38.9  30.7 |   52.0
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    59    59    76    84   100   102   112   105    98    93    74    58 |    112
                    |                                                                         |
    Date of Ext-Day |    20    24    18    29    28    26    12    05    03    01    07    04 |
               -Year|  2004  1999  2004  2007  2003  2002  2002  1998  1998  1997  2006  2007 |
                    |                                                                         |
    Extreme Min Temp|    -6     8    13    19    26    36    45    39    27    14    10    -4 |     -6
                    |                                                                         |
    Date of Ext-Day |    24    05    03    01    08    01    11    31    24    31    01    18 |
               -Year|  2008  1999  2002  2008  2002  2000  1997  1999  2000  2006  2006  2005 |
                    |                                                                         |
Heating Degree Days |  1069   845   641   434   196    49     2     5   106   435   784  1063 |   5629
Cooling Degree Days |     0     0     0     0    39   144   392   278    65     2     0     0 |    920
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   2.2   8.1  24.3  19.4   4.4   0.1   0.0   0.0 |   58.4
    Max Temp >= 75  |   0.0   0.0   0.3   3.9  14.4  24.4  30.6  30.2  21.7   4.2   0.0   0.0 |  129.7
    Max Temp <= 32  |   7.2   1.5   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.6   8.3 |   17.5
                    |                                                                         |
    Min Temp <= 32  |  27.5  23.0  16.3   7.2   1.1   0.0   0.0   0.0   0.7   9.0  20.5  26.5 |  131.7
    Min Temp <= 20  |   9.2   6.5   0.7   0.3   0.0   0.0   0.0   0.0   0.0   0.2   4.1   9.6 |   30.5
    Min Temp  <= 0  |   0.3   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5 |    0.8
                    |                                                                         |
Avg Dew Point Temp  |  25.2  26.7  30.2  33.0  39.0  43.2  47.6  46.1  40.8  33.8  29.8  25.1 |   35.0
Avg Wet Bulb Temp   |  28.4  31.5  38.1  42.5  49.4  54.4  60.2  57.9  51.5  42.4  34.6  28.5 |   43.3
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.25 30.18 30.09 30.01 29.97 29.92 29.89 29.91 29.97 30.10 30.20 30.27 |  30.06
(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   0.5   0.5   2.1   2.2   1.5   1.1   0.7   0.2   0.0   0.0 |    8.8
    Heavy Fog       |   5.7   3.0   0.7   0.3   0.2   0.1   0.1   0.0   0.0   0.8   2.8   5.3 |   18.9
    Fog             |  20.3  13.8   7.4   4.4   5.0   2.0   0.9   1.3   2.3   7.1  14.4  18.9 |   97.8
    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     |  1.07  1.05  0.97  0.69  1.12  0.52  0.36  0.10  0.33  0.51  0.86  1.28 |   8.86
                    |                                                                         |
Maximum Daily       |  0.56  0.56  0.53  0.49  1.10  0.74  1.23  0.28  1.00  0.44  0.69  0.83 |   1.23
                    |                                                                         |
    Date of Ext-Day |    17    23    09    04    05    10    14    22    20    01    24    01 |
               -Year|  2006  2000  1999  1998  2005  2007  2004  2004  2008  2005  1997  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  10.4   9.3   8.5   7.5   7.8   4.9   2.0   1.8   3.7   4.3   8.5  10.8 |   79.3
    >= 0.10         |   4.1   3.9   3.7   2.5   3.1   1.7   0.8   0.2   0.9   2.0   3.2   4.2 |   30.4
    >= 0.25         |   1.1   1.3   0.9   0.8   1.5   0.5   0.4   0.1   0.3   0.7   1.0   1.6 |   10.1
    >= 0.50         |   0.2   0.3   0.2   0.0   0.5   0.2   0.2   0.0   0.1   0.0   0.1   0.5 |    2.1
    >= 1.00         |   0.0   0.0   0.0   0.0   0.2   0.0   0.1   0.0   0.1   0.0   0.0   0.0 |    0.4
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.2   5.5   6.5   7.6   6.9   6.9   6.1   5.5   5.0   5.2   4.5   4.7 |    5.7
Daily Avg Max 2-Min |  12.8  15.1  18.1  20.5  19.7  19.7  19.4  18.0  15.7  15.3  14.0  13.7 |   16.8
Daily Avg Peak Gust |  15.2  18.1  22.0  25.0  24.5  25.0  24.4  22.4  19.5  18.6  16.6  16.6 |   20.7
                    |                                                                         |
Maximum Daily Avg   |  19.4  21.2  25.4  21.4  23.9  20.0  14.7  18.4  17.3  21.9  18.2  19.4 |   25.4
                    |                                                                         |
Maximum 2-Minute Avg|    46    44    44    41    41    41    45    54    37    36    38    45 |     54
                    |                                                                         |
Date of Max 2min-Day|    30    28    29    29    24    01    25    10    29    30    23    14 |
               -Year|  2004  2006  2005  2008  2003  2001  2002  2006  2002  1997  1998  2000 |
                    |                                                                         |
Maximum Peak Gust   |    62    51    51    51    48    49    61    64    48    46    45    54 |     64
                    |                                                                         |
Date of Max Gust-Day|    30    07    28    14    24    19    04    10    10    29    22    14 |
               -Year|  2004  2002  2007  2008  2003  2003  1998  2006  1997  2006  1998  2000 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   2.3   3.5   6.3   9.3   9.1   9.3   8.2   7.3   5.4   4.6   3.2   3.9 |   72.3
   Peak Gust >=40   |   0.4   0.9   0.9   1.8   1.5   1.7   1.6   1.3   0.7   0.6   0.5   0.5 |   12.4
   Peak Gust >=50   |   0.2   0.2   0.1   0.1   0.0   0.0   0.3   0.3   0.0   0.0   0.0   0.2 |    1.3
                    |                                                                         |
   Max 2-Minute >=30|   0.8   1.7   2.5   3.3   2.9   3.6   2.8   2.0   2.0   1.6   1.2   0.0 |   24.6
   Max 2-Minute >=40|   0.1   0.2   0.2   0.3   0.1   0.3   0.3   0.3   0.0   0.0   0.0   0.0 |    1.7
                    |                                                                         |
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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.