STATION:  PORTAGE GLACIER (PATO), AK

CLIMATOLOGICAL SUMMARY.  Period of Record: Oct 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        |  28.3  30.8  32.5  42.2  52.0  58.9  61.2  61.1  54.1  42.9  33.2  31.4 |   44.1
Avg Min Temp        |  15.7  19.3  16.6  28.3  35.8  42.4  46.7  44.2  39.4  32.3  22.6  19.4 |   30.2
Avg Temperature     |  22.0  25.0  24.5  35.2  43.9  50.7  53.9  52.6  46.8  37.6  27.9  25.4 |   37.1
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    47    50    45    67    76    75    79    76    68    60    50    50 |     79
                    |                                                                         |
    Date of Ext-Day |    10    01    22    28    27    21    13    02    24    09    05    15 |
               -Year|  2003  2007  2004  2005  2006  2004  2003  2004  2007  2006  2002  2005 |
                    |                                                                         |
    Extreme Min Temp|   -28   -28   -24    -2    26    29    32    30    22     0   -19   -22 |    -28
                    |                                                                         |
    Date of Ext-Day |    13    12    09    11    03    05    01    23    16    27    24    30 |
               -Year|  2000  1999  1999  2008  2000  2006  2008  2000  2003  2001  2006  2008 |
                    |                                                                         |
Heating Degree Days |  1333  1129  1255   893   655   430   343   383   547   851  1110  1226 |  10153
Cooling Degree Days |     0     0     0     0     0     0     0     0     0     0     0     0 |      0
                    |                                                                         |
Avg Number of Days: |                                                                         |
    Max Temp >= 90  |   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
    Max Temp >= 75  |   0.0   0.0   0.0   0.0   0.1   0.1   0.5   0.3   0.0   0.0   0.0   0.0 |    1.0
    Max Temp <= 32  |  14.6  11.0  10.9   1.5   0.0   0.0   0.0   0.0   0.0   2.5  11.6  12.9 |   65.1
                    |                                                                         |
    Min Temp <= 32  |  24.7  21.3  26.0  19.1  11.0   1.7   0.1   0.5   6.4  15.6  21.7  23.5 |  171.7
    Min Temp <= 20  |  16.9  11.5  16.3   4.4   0.0   0.0   0.0   0.0   0.0   2.9  10.8  14.6 |   77.4
    Min Temp  <= 0  |   6.6   4.3   5.5   0.3   0.0   0.0   0.0   0.0   0.0   0.1   1.8   4.0 |   22.5
                    |                                                                         |
Avg Dew Point Temp  |  17.4  19.8  18.4  27.9  35.2  43.1  47.7  46.8  41.0  32.5  23.1  21.0 |   31.2
Avg Wet Bulb Temp   |  20.9  22.6  22.8  32.7  40.2  47.2  50.7  49.7  43.9  35.2  25.2  23.5 |   34.6
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.19 30.14 30.17 30.08 30.03 29.97 29.96 29.96 30.05 30.12 30.07 30.30 |  30.09
(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   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.0
    Heavy Fog       |   5.4   3.9   4.1   2.3   1.0   0.1   0.2   1.2   2.9   3.0   4.8   5.5 |   34.6
    Fog             |  20.0  16.7  14.1  13.0  11.7  10.0  12.8  13.7  15.5  17.7  18.6  19.7 |  183.5
    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     | 14.68 12.86 10.23 10.38  9.98  8.87  6.79 11.07 18.71 19.93 18.63 20.20 | 162.34
                    |                                                                         |
Maximum Daily       |  7.85  6.81  6.89  3.64  4.52  3.87  3.96  7.56  5.76  5.83  7.12  8.27 |   8.27
                    |                                                                         |
    Date of Ext-Day |    01    20    20    06    12    16    25    28    14    23    20    26 |
               -Year|  1999  1999  1999  2004  2008  2004  2005  2001  2002  2002  2007  2001 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |  18.5  17.0  16.8  16.8  16.5  14.7  16.4  17.7  20.5  22.4  19.4  20.9 |  217.6
    >= 0.10         |  14.5  11.6  12.4  12.0  11.4  10.4  10.7  11.7  15.5  17.1  14.9  16.7 |  158.9
    >= 0.25         |  11.1   9.5   8.6   8.8   7.9   8.5   7.1   8.9  11.9  13.8  12.9  13.9 |  122.9
    >= 0.50         |   7.2   6.0   5.5   5.9   5.9   5.7   4.3   6.2   9.3  10.1   9.3  11.5 |   86.9
    >= 1.00         |   4.6   4.0   3.1   3.8   2.9   2.8   1.7   3.7   6.2   7.0   6.6   6.9 |   53.3
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|  10.2  10.6   8.7   9.5   8.5   8.2   8.0   7.5   8.4   9.1   9.1  10.2 |    9.0
Daily Avg Max 2-Min |  22.3  23.0  20.4  21.8  18.4  17.1  16.5  16.7  19.6  20.6  20.3  23.4 |   20.0
Daily Avg Peak Gust |  32.1  33.8  29.1  31.3  26.2  24.3  22.8  23.4  28.8  30.5  30.1  34.1 |   28.9
                    |                                                                         |
Maximum Daily Avg   |  33.5  30.5  30.7  28.2  28.3  22.6  24.6  23.5  29.7  29.1  33.6  32.7 |   33.6
                    |                                                                         |
Maximum 2-Minute Avg|    53    56    62    51    47    41    45    46    51    52    59    54 |     62
                    |                                                                         |
Date of Max 2min-Day|    12    19    10    05    12    08    26    03    21    23    22    22 |
               -Year|  2001  2008  2005  2004  2008  2000  2004  2006  2006  2002  2002  2001 |
                    |                                                                         |
Maximum Peak Gust   |    82    87    90    81    85    70    69    78    81    84    85    89 |     90
                    |                                                                         |
Date of Max Gust-Day|    26    06    10    02    12    07    26    03    21    25    05    29 |
               -Year|  2000  2006  2005  2004  2008  2007  2004  2006  2006  2007  2002  2003 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |  14.4  12.7  11.0  12.8   9.0   6.3   5.7   6.7  10.5  13.0  13.0  15.9 |  130.8
   Peak Gust >=40   |   9.3   9.2   7.2   8.5   4.0   3.4   2.3   3.8   6.6   6.9   7.7  10.9 |   79.9
   Peak Gust >=50   |   6.7   5.7   4.9   4.7   2.5   1.6   0.4   1.1   3.8   4.5   4.7   6.2 |   46.7
                    |                                                                         |
   Max 2-Minute >=30|   7.9   7.8   5.9   6.6   3.3   2.7   1.3   2.6   5.6   5.9   5.6   0.0 |   55.3
   Max 2-Minute >=40|   2.6   3.6   2.3   2.2   0.5   0.1   0.2   0.3   1.2   1.6   1.6   0.0 |   16.2
                    |                                                                         |
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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.