STATION: SHELTON SANDERSON FIELD AIRPORT (KSHN), WA
CLIMATOLOGICAL SUMMARY. Period of Record: May 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
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Avg Max Temp | 45.4 48.8 52.4 57.9 64.2 69.6 76.3 76.4 71.8 60.2 50.8 44.3 | 59.9
Avg Min Temp | 33.2 32.0 34.8 37.1 42.9 48.2 51.9 51.7 45.9 40.8 36.1 33.3 | 40.7
Avg Temperature | 39.3 40.4 43.6 47.5 53.5 58.9 64.1 64.1 58.9 50.5 43.5 38.8 | 50.3
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Extremes: | |
Extreme Max Temp| 61 63 78 82 91 95 102 96 94 79 77 59 | 102
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Date of Ext-Day | 19 02 29 11 27 26 21 31 03 08 17 24 |
-Year| 2005 2005 2004 2004 2005 2006 2006 1998 2003 2000 2000 2005 |
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Extreme Min Temp| 8 14 22 24 28 35 39 39 30 17 17 6 | 6
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Date of Ext-Day | 04 19 02 03 07 08 05 24 28 31 29 22 |
-Year| 2004 2006 2002 2007 2002 2002 2002 2003 1999 2002 2006 1998 |
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Heating Degree Days | 797 695 662 526 357 197 74 67 190 448 646 812 | 5472
Cooling Degree Days | 0 0 0 0 2 13 46 38 7 0 0 0 | 106
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.1 0.9 1.9 2.0 0.7 0.0 0.0 0.0 | 5.6
Max Temp >= 75 | 0.0 0.0 0.1 1.3 3.6 7.5 16.3 16.7 10.5 0.9 0.2 0.0 | 57.1
Max Temp <= 32 | 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.8 | 1.4
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Min Temp <= 32 | 13.7 14.5 12.0 7.3 1.7 0.0 0.0 0.0 0.4 4.5 10.4 13.6 | 78.0
Min Temp <= 20 | 1.4 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.7 0.8 | 3.6
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
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Avg Dew Point Temp | 36.5 35.1 37.7 39.4 44.2 48.7 52.3 52.9 49.2 44.8 39.9 35.9 | 43.1
Avg Wet Bulb Temp | 38.1 38.0 40.9 43.6 48.7 53.1 56.8 57.1 53.3 47.4 41.9 37.6 | 46.4
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Avg Sea Level Pres | 30.11 30.12 30.09 30.05 30.06 30.03 30.04 30.02 30.02 30.09 30.13 30.14 | 30.07
(Inches of Mercury) | |
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WEATHER | Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec | Year
See disclaimer below| |
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Avg Number of Days: | |
Thunderstorms | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 | 0.3
Heavy Fog | 9.5 6.1 3.6 3.9 1.8 0.9 1.5 3.1 4.5 6.9 9.2 9.6 | 60.6
Fog | 25.4 20.0 21.9 17.5 14.7 12.1 10.8 13.7 15.8 21.1 22.7 23.4 | 219.3
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
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Average Monthly | 11.86 6.30 6.45 3.54 2.31 1.61 0.62 1.22 1.56 4.83 11.79 11.16 | 63.25
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Maximum Daily | 4.23 2.40 2.69 1.15 1.49 0.95 0.86 1.60 1.77 3.37 4.52 3.60 | 4.52
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Date of Ext-Day | 17 24 26 13 14 24 21 22 29 17 06 27 |
-Year| 2005 1999 2005 2002 2001 2001 2007 2001 2005 2003 2006 1998 |
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Avg Number of Days: | |
>= 0.01 | 22.3 16.9 19.5 16.2 13.2 8.3 4.0 6.7 8.5 16.3 19.6 21.9 | 173.4
>= 0.10 | 16.9 11.6 13.6 9.6 6.5 4.0 1.5 2.6 3.9 10.0 14.0 15.5 | 109.7
>= 0.25 | 12.7 7.2 8.5 5.2 2.6 2.6 1.1 1.3 2.1 6.6 10.9 12.5 | 73.3
>= 0.50 | 7.9 4.3 4.4 1.9 1.0 0.9 0.3 0.6 0.6 3.1 7.2 7.2 | 39.5
>= 1.00 | 3.1 1.6 1.1 0.1 0.3 0.0 0.0 0.3 0.2 0.7 3.9 3.5 | 14.8
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WIND (MPH) | Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec | Year
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Daily Avg Wind Speed| 4.4 4.7 5.9 6.3 7.5 7.8 7.6 7.0 5.2 4.8 4.3 4.6 | 5.8
Daily Avg Max 2-Min | 14.1 14.9 17.5 17.3 18.2 17.8 16.9 16.5 14.5 14.4 14.1 14.6 | 15.9
Daily Avg Peak Gust | 18.1 19.3 22.5 22.0 22.9 22.3 21.2 20.7 18.3 18.4 18.2 19.0 | 20.2
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Maximum Daily Avg | 16.0 18.9 16.3 17.5 91.5 16.6 15.8 15.0 17.8 18.2 19.0 18.4 | 91.5
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Maximum 2-Minute Avg| 39 39 39 43 33 34 32 35 29 38 36 40 | 43
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Date of Max 2min-Day| 05 22 03 13 08 15 13 17 24 18 24 14 |
-Year| 2007 1999 1999 2002 2007 1998 1999 2008 1999 2007 1998 2006 |
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Maximum Peak Gust | 54 54 52 61 41 46 37 44 39 51 47 55 | 61
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Date of Max Gust-Day| 05 22 03 13 08 15 13 17 24 18 24 13 |
-Year| 2007 1999 1999 2002 2007 1998 1999 2008 1999 2007 1998 2006 |
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Avg Number of Days: | |
Peak Gust >=30 | 4.7 4.6 6.2 4.9 5.8 3.9 2.3 2.2 2.0 3.1 4.4 5.7 | 50.0
Peak Gust >=40 | 0.8 1.1 1.0 0.7 0.2 0.1 0.0 0.1 0.0 0.3 1.4 1.6 | 7.3
Peak Gust >=50 | 0.1 0.3 0.2 0.2 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.3 | 1.2
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Max 2-Minute >=30| 0.8 1.3 1.1 0.7 0.4 0.2 0.4 0.2 0.0 0.4 1.1 0.0 | 6.6
Max 2-Minute >=40| 0.0 0.0 0.0 0.1 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.