STATION:  RIVERSIDE MUNICIPAL ARPT (KRAL), 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        |  67.8  67.4  71.1  73.1  81.0  86.5  93.5  94.1  90.3  81.6  73.4  67.3 |   78.9
Avg Min Temp        |  40.6  42.2  44.2  46.4  53.2  57.0  62.3  62.0  58.8  52.4  45.0  39.9 |   50.3
Avg Temperature     |  54.2  54.8  57.7  59.8  67.1  71.8  77.9  78.1  74.5  67.0  59.2  53.6 |   64.6
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    95    91    94   102   105   104   113   109   110   103    94    86 |    113
                    |                                                                         |
    Date of Ext-Day |    30    22    29    26    28    16    22    29    01    21    07    24 |
               -Year|  2003  2002  2004  2004  2003  2006  2006  1998  2002  2003  2006  2005 |
                    |                                                                         |
    Extreme Min Temp|    24    30    30    32    39    43    52    53    49    41    27    25 |     24
                    |                                                                         |
    Date of Ext-Day |    14    02    04    02    10    05    24    31    25    29    30    24 |
               -Year|  2007  2002  2002  1999  2003  1999  1999  1999  2005  2006  2004  1998 |
                    |                                                                         |
Heating Degree Days |   338   290   237   178    34     4     0     0     1    45   190   355 |   1673
Cooling Degree Days |     3     2    10    20    98   208   401   405   287   106    17     2 |   1559
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.3   0.1   0.9   1.8   5.2  12.9  23.8  24.5  16.7   8.4   0.9   0.0 |   95.6
    Max Temp >= 75  |   7.6   5.9  10.9  11.7  23.3  27.8  31.0  30.9  29.0  21.7  12.8   6.7 |  219.2
    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  |   1.8   1.1   0.7   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.4   2.8 |    6.9
    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  |  31.6  34.0  38.0  40.6  45.6  49.2  51.5  52.3  49.8  43.1  36.0  30.2 |   41.8
Avg Wet Bulb Temp   |  41.1  42.3  44.9  46.9  51.5  54.9  57.3  58.5  56.4  51.0  45.0  40.7 |   49.2
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.08 30.04 29.98 29.96 29.90 29.86 29.88 29.86 29.84 29.92 30.02 30.08 |  29.95
(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   |   0.7   1.7   0.7   0.6   0.4   0.0   0.8   0.2   0.3   0.9   0.8   1.2 |    8.3
    Heavy Fog       |   1.1   0.5   2.4   0.6   0.8   1.3   0.2   0.5   1.5   2.1   0.6   1.2 |   12.8
    Fog             |  15.6  15.9  19.5  17.0  18.2  18.6  14.2  14.4  13.9  17.2  16.2  13.0 |  193.6
    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     |  1.14  2.43  0.81  0.81  0.08  0.04  0.03  0.00  0.01  0.40  0.50  0.87 |   7.12
                    |                                                                         |
Maximum Daily       |  2.39  1.43  1.99  1.34  0.31  0.32  0.15  0.04  0.05  1.48  0.76  1.45 |   2.39
                    |                                                                         |
    Date of Ext-Day |    09    21    15    14    22    02    16    31    20    27    24    15 |
               -Year|  2005  2005  2003  2003  2006  1999  1999  1998  2005  2004  2001  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   4.3   6.9   5.0   4.6   0.8   0.3   0.5   0.1   0.4   2.3   3.6   4.4 |   33.0
    >= 0.10         |   2.3   4.7   1.9   1.9   0.3   0.1   0.1   0.0   0.0   0.8   1.5   2.0 |   15.6
    >= 0.25         |   1.4   3.1   0.9   1.1   0.1   0.1   0.0   0.0   0.0   0.5   0.6   1.0 |    8.8
    >= 0.50         |   0.6   2.0   0.3   0.3   0.0   0.0   0.0   0.0   0.0   0.3   0.2   0.5 |    4.2
    >= 1.00         |   0.3   0.6   0.1   0.1   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.2 |    1.4
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.8   4.5   4.5   4.6   4.9   5.1   4.8   4.6   4.0   3.8   3.9   4.6 |    4.5
Daily Avg Max 2-Min |  15.6  15.4  15.9  16.3  16.5  16.5  16.6  16.4  15.5  14.4  14.0  15.0 |   15.7
Daily Avg Peak Gust |  19.4  19.2  20.0  20.8  21.1  21.2  21.5  21.1  19.8  18.2  17.7  18.7 |   19.9
                    |                                                                         |
Maximum Daily Avg   |  23.5  19.6  19.5  13.1  13.2   8.3   7.7   7.7  15.0  18.6  19.7  23.9 |   23.9
                    |                                                                         |
Maximum 2-Minute Avg|    40    37    39    31    28    24    58    31    29    31    40    43 |     58
                    |                                                                         |
Date of Max 2min-Day|    06    09    21    15    03    16    22    31    28    17    26    09 |
               -Year|  2003  2002  2000  1999  2001  2006  2007  1998  2005  1999  2002  1998 |
                    |                                                                         |
Maximum Peak Gust   |    52    47    47    38    37    31    58    41    39    40    51    53 |     58
                    |                                                                         |
Date of Max Gust-Day|    06    09    20    12    03    16    22    31    28    21    26    09 |
               -Year|  2003  2002  2000  2007  2001  2006  2007  1998  2005  2007  2002  1998 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   5.3   2.3   2.5   1.2   0.4   0.1   0.2   0.1   0.5   1.7   3.0   5.0 |   22.4
   Peak Gust >=40   |   2.0   0.4   0.7   0.0   0.0   0.0   0.2   0.1   0.0   0.1   0.9   1.6 |    6.0
   Peak Gust >=50   |   0.2   0.0   0.0   0.0   0.0   0.0   0.2   0.0   0.0   0.0   0.1   0.2 |    0.7
                    |                                                                         |
   Max 2-Minute >=30|   3.0   0.8   1.0   0.3   0.0   0.0   0.2   0.1   0.0   0.6   1.2   0.0 |    7.1
   Max 2-Minute >=40|   0.1   0.0   0.0   0.0   0.0   0.0   0.2   0.0   0.0   0.0   0.1   0.0 |    0.4
                    |                                                                         |
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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.