STATION:  CHALLIS AIRPORT (KLLJ), ID

CLIMATOLOGICAL SUMMARY.  Period of Record: Sep 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        |  29.7  35.6  48.7  57.2  67.2  76.9  88.8  85.4  73.1  59.3  42.0  29.4 |   57.8
Avg Min Temp        |   8.6  13.8  23.5  29.7  38.1  44.5  51.6  48.3  39.4  30.1  20.1  10.2 |   29.8
Avg Temperature     |  19.2  24.7  36.1  43.5  52.7  60.7  70.2  66.8  56.2  44.7  31.1  19.8 |   43.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    61    54    72    81    96    97   103    99    95    81    72    62 |    103
                    |                                                                         |
    Date of Ext-Day |    11    28    30    29    28    28    12    01    03    01    07    29 |
               -Year|  2000  2008  2004  2007  2003  2007  2002  2000  2007  2001  2006  2005 |
                    |                                                                         |
    Extreme Min Temp|   -24   -11    -2    11    20    30    36    33    19    -4    -9   -22 |    -24
                    |                                                                         |
    Date of Ext-Day |    22    08    02    01    08    09    05    31    28    31    01    08 |
               -Year|  2008  2001  2002  2008  2002  1999  1999  2006  1999  2002  2002  2005 |
                    |                                                                         |
Heating Degree Days |  1421  1139   895   646   387   160    11    36   271   629  1018  1402 |   8016
Cooling Degree Days |     0     0     0     0     5    30   171    93     8     0     0     0 |    307
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   0.0   0.0   0.0   0.0   0.3   2.8  14.8   9.0   0.4   0.0   0.0   0.0 |   27.3
    Max Temp >= 75  |   0.0   0.0   0.0   0.6   9.3  19.3  30.1  29.1  14.9   2.2   0.0   0.0 |  105.5
    Max Temp <= 32  |  19.6   9.8   1.0   0.0   0.0   0.0   0.0   0.0   0.0   0.5   5.7  19.3 |   55.8
                    |                                                                         |
    Min Temp <= 32  |  30.9  28.2  28.3  19.4   7.1   0.6   0.0   0.0   3.6  19.9  27.7  30.7 |  196.5
    Min Temp <= 20  |  25.9  20.8   9.3   3.0   0.2   0.0   0.0   0.0   0.1   2.4  14.4  24.6 |  100.7
    Min Temp  <= 0  |   7.0   2.6   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.7   5.9 |   16.5
                    |                                                                         |
Avg Dew Point Temp  |  12.4  15.0  19.4  22.9  28.9  34.6  37.4  35.8  31.3  25.4  20.1  13.2 |   24.7
Avg Wet Bulb Temp   |  17.1  21.2  29.6  34.9  41.8  47.7  53.0  50.7  43.9  35.9  26.6  17.8 |   35.0
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.24 30.15 30.06 30.00 29.94 29.93 29.89 29.91 29.99 30.07 30.17 30.25 |  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   0.0   0.0   0.5   0.0   0.0   0.0   0.0   0.0   0.0 |    0.5
    Heavy Fog       |   3.9   1.2   0.7   0.1   0.1   0.0   0.0   0.0   0.0   0.5   1.3   2.8 |   10.5
    Fog             |  14.3   8.2   4.8   3.7   2.8   2.3   0.8   1.2   2.2   2.9   7.3  14.2 |   64.7
    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     |  0.37  0.23  0.31  0.52  0.87  0.66  0.32  0.42  0.61  0.56  0.46  0.40 |   5.75
                    |                                                                         |
Maximum Daily       |  0.54  0.20  0.50  0.65  0.47  0.48  0.44  0.48  0.88  1.08  0.84  0.36 |   1.08
                    |                                                                         |
    Date of Ext-Day |    11    09    27    20    21    26    17    16    06    28    21    01 |
               -Year|  2000  1999  2007  2001  2002  2005  2007  2007  2001  2004  2006  2005 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   6.3   4.5   5.4   7.0   7.8   6.3   4.3   4.8   3.7   4.1   6.5   6.5 |   67.2
    >= 0.10         |   1.0   0.7   0.8   1.2   3.4   2.3   1.2   1.2   1.9   1.5   1.7   1.5 |   18.4
    >= 0.25         |   0.1   0.0   0.1   0.4   1.2   0.7   0.2   0.5   0.8   0.5   0.1   0.2 |    4.7
    >= 0.50         |   0.1   0.0   0.1   0.2   0.0   0.0   0.0   0.0   0.2   0.3   0.1   0.0 |    1.0
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.2   0.0   0.0 |    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|   2.1   2.9   4.9   5.8   6.0   5.8   5.3   4.8   4.0   3.6   2.8   2.4 |    4.2
Daily Avg Max 2-Min |  10.4  11.9  18.1  20.3  21.2  21.4  21.4  20.1  16.9  15.0  12.0  10.7 |   16.6
Daily Avg Peak Gust |  12.5  14.4  23.0  25.8  27.0  27.8  28.1  26.1  21.6  19.0  14.9  13.0 |   21.1
                    |                                                                         |
Maximum Daily Avg   |  12.5  11.9  15.0  16.8  13.4  13.9  12.7  12.3  13.7  11.9  12.9  13.0 |   16.8
                    |                                                                         |
Maximum 2-Minute Avg|    35    35    38    46    45    40    43    43    40    36    32    31 |     46
                    |                                                                         |
Date of Max 2min-Day|    01    08    09    27    22    21    19    09    01    29    20    20 |
               -Year|  2004  2002  2006  2000  2004  2008  1999  2000  2004  2003  2008  2007 |
                    |                                                                         |
Maximum Peak Gust   |    46    40    51    55    53    56    69    58    54    49    45    47 |     69
                    |                                                                         |
Date of Max Gust-Day|    06    08    09    27    30    27    19    19    04    29    19    15 |
               -Year|  2007  2002  2006  2000  2003  2002  1999  2007  2005  2003  2003  2006 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.9   1.7   7.3   9.1  10.5  12.6  14.2  11.6   6.6   5.0   2.4   1.6 |   84.6
   Peak Gust >=40   |   0.4   0.1   1.3   2.1   2.2   2.9   2.3   2.2   1.3   0.5   0.3   0.2 |   15.8
   Peak Gust >=50   |   0.0   0.0   0.1   0.1   0.4   0.2   0.5   0.4   0.3   0.0   0.0   0.0 |    2.0
                    |                                                                         |
   Max 2-Minute >=30|   0.4   0.2   2.1   2.5   3.3   3.2   3.0   3.0   1.7   0.9   0.6   0.0 |   21.1
   Max 2-Minute >=40|   0.0   0.0   0.0   0.1   0.4   0.1   0.4   0.3   0.1   0.0   0.0   0.0 |    1.4
                    |                                                                         |
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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.