STATION:  TANANA-RALPH M CALHOUN MEML ARPT (PATA), AK

CLIMATOLOGICAL SUMMARY.  Period of Record: Nov 1999 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        |   2.2  10.7  17.7  38.8  58.4  70.4  69.9  64.0  51.6  30.8  11.4   3.7 |   35.8
Avg Min Temp        | -15.2  -7.7  -6.8  15.1  33.2  45.3  48.1  42.4  33.4  17.4  -3.6 -12.6 |   15.7
Avg Temperature     |  -6.5   1.5   5.4  26.9  45.8  57.9  59.0  53.2  42.5  24.1   3.9  -4.4 |   25.8
                    |                                                                         |
Extremes:           |                                                                         |
    Extreme Max Temp|    52    38    38    67    85    85    85    83    70    66    58    39 |     85
                    |                                                                         |
    Date of Ext-Day |    22    09    30    30    25    29    18    03    01    01    26    06 |
               -Year|  2004  2003  2000  2005  2002  2004  2002  2002  2007  2003  1999  2001 |
                    |                                                                         |
    Extreme Min Temp|   -58   -47   -48   -26     2    30    30    27     9   -19   -41   -59 |    -59
                    |                                                                         |
    Date of Ext-Day |    02    12    01    01    03    03    28    30    29    27    28    30 |
               -Year|  2000  2005  2006  2001  2001  2006  2000  2002  2004  2008  2005  1999 |
                    |                                                                         |
Heating Degree Days |  2219  1795  1846  1142   596   219   194   367   675  1268  1833  2152 |  14308
Cooling Degree Days |     0     0     0     0     1     5     9     1     0     0     0     0 |     14
                    |                                                                         |
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   1.1   8.9  10.1   2.9   0.0   0.0   0.0   0.0 |   23.0
    Max Temp <= 32  |  30.2  27.4  28.7   8.8   0.3   0.0   0.0   0.0   0.3  16.7  29.2  30.7 |  172.3
                    |                                                                         |
    Min Temp <= 32  |  31.0  28.2  31.0  27.7  15.1   0.5   0.2   2.6  12.9  29.1  30.0  31.0 |  239.3
    Min Temp <= 20  |  30.6  27.0  30.6  15.8   1.4   0.0   0.0   0.0   2.7  15.9  28.3  30.8 |  183.1
    Min Temp  <= 0  |  23.8  17.8  20.0   6.4   0.0   0.0   0.0   0.0   0.0   4.2  18.2  24.2 |  114.6
                    |                                                                         |
Avg Dew Point Temp  |  -4.7  -1.1  -2.4  15.7  30.4  45.0  49.0  46.0  35.4  19.3  -0.6  -4.9 |   18.9
Avg Wet Bulb Temp   |  -1.5   4.5   6.2  24.2  39.8  51.9  53.5  49.8  39.6  22.8   3.7  -0.9 |   24.5
                    |                                                                         |
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                    |                                                                         |
Avg Sea Level Pres  | 30.21 30.12 30.16 30.07 30.01 29.93 29.87 29.94 29.98 30.05 30.05 30.15 |  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   0.4   3.4   2.0   0.3   0.0   0.0   0.0   0.0 |    6.2
    Heavy Fog       |   1.1   0.6   0.1   1.3   0.3   0.3   0.1   2.0   2.4   1.0   0.8   0.6 |   10.7
    Fog             |  14.9  10.2   6.1   5.1   6.0   6.8  11.3  15.2  11.2  12.7  12.7  11.3 |  123.5
    Hail            |   0.0   0.0   0.0   0.0   0.0   0.2   0.0   0.0   0.0   0.1   0.0   0.0 |    0.3
                    |                                                                         |
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                    |                                                                         |
PRECIPITATION (In)  |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Average Monthly     |  0.12  0.21  0.20  0.42  0.72  1.55  1.71  2.00  1.38  0.56  0.25  0.12 |   9.23
                    |                                                                         |
Maximum Daily       |  0.36  0.29  0.28  0.77  0.47  1.36  0.78  1.15  0.85  0.83  0.47  0.20 |   1.36
                    |                                                                         |
    Date of Ext-Day |    18    08    22    26    06    07    25    15    24    30    10    21 |
               -Year|  2003  2003  2000  2002  2004  2003  2002  2001  2005  2006  2000  1999 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
    >= 0.01         |   2.4   3.2   2.2   4.2   7.2  10.5  12.6  12.4  11.0   7.7   4.1   3.4 |   81.0
    >= 0.10         |   0.2   0.7   0.9   1.3   2.2   3.6   4.9   6.8   4.7   1.3   0.6   0.5 |   27.7
    >= 0.25         |   0.1   0.2   0.2   0.3   1.0   2.0   2.6   2.6   1.7   0.6   0.2   0.0 |   11.4
    >= 0.50         |   0.0   0.0   0.0   0.1   0.0   0.9   0.8   0.7   0.3   0.1   0.0   0.0 |    2.9
    >= 1.00         |   0.0   0.0   0.0   0.0   0.0   0.2   0.0   0.1   0.0   0.0   0.0   0.0 |    0.3
                    |                                                                         |
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                    |                                                                         |
WIND (MPH)          |   Jan   Feb   Mar   Apr   May   Jun   Jul   Aug   Sep   Oct   Nov   Dec |   Year
                    |                                                                         |
Daily Avg Wind Speed|   4.3   5.5   5.9   5.4   5.3   4.8   4.7   4.2   4.6   4.9   4.3   4.2 |    4.8
Daily Avg Max 2-Min |  12.5  14.5  14.1  14.0  14.5  13.9  13.1  11.8  12.0  12.2  12.1  12.5 |   13.1
Daily Avg Peak Gust |  16.0  18.6  18.2  17.9  18.6  18.3  17.4  15.4  15.5  15.7  15.3  16.0 |   16.9
                    |                                                                         |
Maximum Daily Avg   |  14.3  13.4  21.4  13.0  15.6  11.0  11.9   9.8  10.9  17.6  12.4  17.8 |   21.4
                    |                                                                         |
Maximum 2-Minute Avg|    30    46    36    26    25    25    25    23    25    35    24    32 |     46
                    |                                                                         |
Date of Max 2min-Day|    22    09    21    26    04    10    01    13    27    09    09    08 |
               -Year|  2008  2002  2005  2002  2003  2001  2002  2004  2005  2006  2005  2008 |
                    |                                                                         |
Maximum Peak Gust   |    46    46    47    33    35    36    35    28    32    47    36    39 |     47
                    |                                                                         |
Date of Max Gust-Day|    22    09    21    02    14    17    04    13    27    09    16    08 |
               -Year|  2008  2002  2005  2001  2000  2005  2008  2004  2005  2006  2006  2008 |
                    |                                                                         |
Avg Number of Days: |                                                                         |
   Peak Gust >=30   |   1.1   1.9   1.3   0.6   0.9   0.8   0.9   0.0   0.4   0.7   0.5   0.9 |   10.0
   Peak Gust >=40   |   0.2   0.1   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0 |    0.7
   Peak Gust >=50   |   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 2-Minute >=30|   0.1   0.2   0.2   0.0   0.0   0.0   0.0   0.0   0.0   0.1   0.0   0.0 |    0.7
   Max 2-Minute >=40|   0.0   0.1   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 |    0.1
                    |                                                                         |
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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.