STATION:  JEROME COUNTY AIRPORT (KJER), ID

CLIMATOLOGICAL SUMMARY.  Period of Record: Feb 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        |  33.7  38.2  50.7  58.2  68.6  77.9  89.1  86.4  76.0  62.0  47.8  35.1 |   60.3
Avg Min Temp        |  20.6  22.8  29.8  34.7  42.8  49.8  58.0  54.9  46.7  37.4  28.5  21.2 |   37.3
Avg Temperature     |  27.2  30.5  40.3  46.4  55.7  63.8  73.5  70.7  61.4  49.7  38.2  28.2 |   48.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    59    58    75    86    99   100   105    99    97    89    76    54 |    105
                    |                                                                         |
    Date of Ext-Day |    31    14    21    27    28    29    12    03    04    01    06    10 |
               -Year|  2003  2000  2004  2000  2003  2008  2002  1997  1998  1997  1999  2004 |
                    |                                                                         |
    Extreme Min Temp|    -5    -2     9    18    25    34    39    32    28    17     8    -5 |     -5
                    |                                                                         |
    Date of Ext-Day |    05    13    02    21    08    01    05    31    27    30    01    21 |
               -Year|  2004  2004  2002  2008  2002  2000  1999  2006  1999  2002  2002  1998 |
                    |                                                                         |
Heating Degree Days |  1173   973   767   557   307   113     7    15   159   476   805  1141 |   6493
Cooling Degree Days |     0     0     0     0    18    78   272   191    50     2     0     0 |    610
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.4   3.8  15.9   9.9   1.9   0.0   0.0   0.0 |   31.9
    Max Temp >= 75  |   0.0   0.0   0.2   1.8   9.4  19.0  30.4  29.5  17.7   4.0   0.1   0.0 |  112.1
    Max Temp <= 32  |  13.9   6.9   0.8   0.0   0.0   0.0   0.0   0.0   0.0   0.2   1.9  11.7 |   35.3
                    |                                                                         |
    Min Temp <= 32  |  29.7  25.8  20.4  11.6   2.7   0.0   0.0   0.1   0.9   7.4  20.4  28.1 |  146.9
    Min Temp <= 20  |  14.9  10.1   2.1   0.3   0.0   0.0   0.0   0.0   0.0   0.4   5.0  14.3 |   47.1
    Min Temp  <= 0  |   0.7   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.3 |    1.1
                    |                                                                         |
Avg Dew Point Temp  |  21.4  23.2  26.6  29.8  36.2  41.1  46.7  44.4  37.8  30.3  27.1  22.2 |   32.2
Avg Wet Bulb Temp   |  24.8  27.5  34.1  38.8  46.0  51.7  57.9  55.6  48.7  40.2  33.1  25.7 |   40.3
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.23 30.15 30.07 29.99 29.95 29.91 29.91 29.93 29.97 30.07 30.16 30.23 |  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   0.0   0.0   0.8   1.7   1.9   2.4   1.7   0.9   0.6   0.2   0.0 |   10.2
    Heavy Fog       |   7.2   4.0   2.6   1.9   0.7   0.2   0.0   0.0   0.3   0.6   3.1   5.4 |   25.9
    Fog             |  16.5  11.0   7.2   5.7   3.6   2.3   0.3   0.5   2.1   3.6   7.7  13.2 |   73.8
    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     |  1.05  0.77  0.91  1.19  1.32  0.41  0.08  0.12  0.30  0.66  0.92  1.45 |   9.19
                    |                                                                         |
Maximum Daily       |  0.79  0.42  0.71  0.92  1.06  0.38  0.19  0.23  0.36  0.62  0.94  1.23 |   1.23
                    |                                                                         |
    Date of Ext-Day |    20    17    06    20    10    04    04    12    12    05    13    08 |
               -Year|  1999  1999  2002  2005  1998  1998  2006  1997  1998  2007  2006  2004 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  10.4   9.0   8.4   8.5   7.0   4.3   1.2   1.8   3.3   5.3   7.7  10.7 |   77.6
    >= 0.10         |   3.7   2.7   2.9   3.9   3.6   1.5   0.3   0.4   1.4   2.0   2.9   4.3 |   29.6
    >= 0.25         |   1.0   0.6   1.1   1.4   1.8   0.4   0.0   0.0   0.1   0.9   1.1   2.0 |   10.5
    >= 0.50         |   0.2   0.0   0.2   0.4   0.8   0.0   0.0   0.0   0.0   0.1   0.4   0.3 |    2.4
    >= 1.00         |   0.0   0.0   0.0   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.1 |    0.2
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|  11.4  12.2  11.3  10.9  10.3   9.7   7.4   7.3   8.1   9.3  10.0  10.5 |    9.9
Daily Avg Max 2-Min |  21.9  22.7  22.8  23.1  22.4  21.1  17.0  17.1  17.5  19.4  20.2  20.7 |   20.5
Daily Avg Peak Gust |  25.8  26.6  27.4  28.1  27.3  26.1  21.6  21.5  22.3  23.6  24.2  24.7 |   24.9
                    |                                                                         |
Maximum Daily Avg   |  27.9  26.6  21.9  29.7  26.4  26.7  13.3  15.8  18.9  20.5  27.1  25.2 |   29.7
                    |                                                                         |
Maximum 2-Minute Avg|    48    45    48    49    46    46    45    44    39    38    48    43 |     49
                    |                                                                         |
Date of Max 2min-Day|    01    14    25    09    20    13    30    04    05    30    23    13 |
               -Year|  2004  2000  2006  1999  2008  2006  1998  2006  2001  1997  2006  1999 |
                    |                                                                         |
Maximum Peak Gust   |    67    58    54    59    59    62    74    53    47    47    62    54 |     74
                    |                                                                         |
Date of Max Gust-Day|    30    14    25    09    20    26    07    04    06    23    23    13 |
               -Year|  2004  2000  2006  1999  2008  2002  2007  2006  2006  2001  2006  1999 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   9.4   9.7  11.1  11.8  11.0   8.9   4.0   4.3   5.6   7.4   6.4   9.6 |   99.3
   Peak Gust >=40   |   1.9   1.8   2.8   3.5   3.0   2.2   0.9   1.0   1.2   1.5   1.2   1.9 |   22.9
   Peak Gust >=50   |   0.2   0.2   0.1   0.5   0.1   0.3   0.3   0.2   0.0   0.0   0.3   0.1 |    2.2
                    |                                                                         |
   Max 2-Minute >=30|   4.1   3.9   5.0   5.6   5.0   4.0   1.1   0.9   1.5   3.3   2.5   0.0 |   36.9
   Max 2-Minute >=40|   0.3   0.4   0.3   0.8   0.3   0.3   0.2   0.1   0.0   0.0   0.3   0.0 |    3.0
                    |                                                                         |
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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.