STATION: SEATTLE-BOEING FLD/KING CO INTL AP (KBFI), WA
CLIMATOLOGICAL SUMMARY. Period of Record: Dec 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 | 47.8 50.3 53.5 58.6 64.7 70.3 76.1 75.8 69.8 60.0 51.9 47.0 | 60.5
Avg Min Temp | 36.8 36.3 39.8 42.6 48.3 53.5 57.5 57.5 52.7 46.2 39.7 36.4 | 45.6
Avg Temperature | 42.3 43.3 46.6 50.6 56.5 61.9 66.8 66.6 61.2 53.1 45.8 41.7 | 53.0
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Extremes: | |
Extreme Max Temp| 63 64 79 82 89 93 95 91 87 78 64 61 | 95
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Date of Ext-Day | 07 24 29 16 26 07 23 13 14 06 08 14 |
-Year| 2002 2005 2004 1999 2005 2003 2004 2002 2000 2000 2008 2002 |
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Extreme Min Temp| 17 20 27 30 32 44 49 49 40 29 19 15 | 15
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Date of Ext-Day | 12 18 03 03 14 04 02 31 28 31 29 22 |
-Year| 2007 2006 2001 2008 1999 2001 1999 1999 1999 2002 2006 1998 |
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Heating Degree Days | 703 613 570 432 270 127 32 26 129 369 576 722 | 4568
Cooling Degree Days | 0 0 0 0 6 34 87 76 15 0 0 0 | 218
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.0 0.5 1.1 0.3 0.0 0.0 0.0 0.0 | 1.9
Max Temp >= 75 | 0.0 0.0 0.1 0.8 3.0 8.0 17.6 18.3 7.0 0.3 0.0 0.0 | 55.1
Max Temp <= 32 | 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.9 | 1.3
| |
Min Temp <= 32 | 6.5 7.4 2.5 0.4 0.4 0.0 0.0 0.0 0.0 0.5 4.7 7.7 | 30.2
Min Temp <= 20 | 0.5 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.7 | 1.4
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 | 37.1 35.8 38.3 40.1 45.0 48.9 52.2 53.2 50.5 45.9 40.3 36.8 | 43.7
Avg Wet Bulb Temp | 40.2 40.2 42.8 45.6 50.5 54.6 58.3 58.7 55.1 49.4 43.3 39.7 | 48.2
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Avg Sea Level Pres | 30.11 30.12 30.09 30.05 30.06 30.04 30.04 30.02 30.03 30.10 30.12 30.13 | 30.08
(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 | 2.1 2.5 1.5 1.2 0.4 2.0 2.7 2.8 2.5 2.7 1.3 2.7 | 24.4
Heavy Fog | 2.2 1.3 0.5 0.2 0.2 0.0 0.0 0.1 0.2 2.3 2.8 3.3 | 13.1
Fog | 21.1 15.5 14.1 10.8 8.4 7.8 4.1 5.4 8.1 14.8 18.2 19.6 | 147.9
Hail | 0.2 0.1 0.7 0.0 0.0 0.1 0.2 0.0 0.0 0.0 0.1 0.3 | 1.7
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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 | 5.94 3.35 3.53 2.12 1.90 1.35 0.56 1.08 1.19 2.87 6.23 5.92 | 36.04
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Maximum Daily | 1.97 1.19 1.42 1.05 1.11 1.27 0.66 1.58 1.06 4.04 2.14 3.96 | 4.04
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Date of Ext-Day | 17 01 26 13 31 11 16 22 30 20 06 03 |
-Year| 2005 2000 2005 2002 2005 2001 1999 2001 2007 2003 2006 2007 |
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Avg Number of Days: | |
>= 0.01 | 20.2 14.7 18.0 14.1 12.3 9.8 4.2 5.3 8.0 13.8 17.6 19.3 | 157.3
>= 0.10 | 13.8 8.4 10.3 7.1 5.6 4.1 1.7 2.5 3.7 6.8 11.9 12.7 | 88.6
>= 0.25 | 7.3 4.7 5.4 2.8 2.5 1.2 0.8 1.6 1.7 3.9 7.9 8.2 | 48.0
>= 0.50 | 4.0 2.2 1.5 0.5 0.9 0.6 0.2 0.5 0.4 1.0 4.7 3.6 | 20.1
>= 1.00 | 1.0 0.3 0.2 0.1 0.1 0.1 0.0 0.1 0.1 0.1 1.7 0.8 | 4.6
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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| 6.1 5.6 6.7 6.1 5.7 5.7 5.3 5.0 4.5 5.1 5.4 6.0 | 5.6
Daily Avg Max 2-Min | 15.3 14.7 16.4 14.6 13.8 13.5 12.6 12.5 12.4 13.6 14.1 15.5 | 14.1
Daily Avg Peak Gust | 20.8 20.0 22.3 20.0 19.1 18.7 17.8 17.5 17.3 19.0 19.6 21.6 | 19.5
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Maximum Daily Avg | 16.2 17.7 19.8 15.1 12.8 12.0 11.5 12.3 11.7 15.0 15.2 16.6 | 19.8
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Maximum 2-Minute Avg| 36 36 59 28 25 23 22 21 24 29 31 39 | 59
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Date of Max 2min-Day| 16 04 13 15 05 12 28 31 24 18 21 14 |
-Year| 2000 2006 2000 2006 2002 2000 2001 2000 1999 2007 2006 2006 |
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Maximum Peak Gust | 51 47 59 39 32 39 32 31 37 41 43 56 | 59
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Date of Max Gust-Day| 16 04 13 03 19 09 12 25 24 18 20 15 |
-Year| 2000 2006 2000 2003 2000 2008 2006 2004 1999 2007 2001 2006 |
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Avg Number of Days: | |
Peak Gust >=30 | 4.2 3.3 5.0 0.8 0.7 0.2 0.1 0.1 0.5 2.1 2.9 5.6 | 25.6
Peak Gust >=40 | 0.6 0.3 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 1.1 | 3.1
Peak Gust >=50 | 0.1 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 | 0.5
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Max 2-Minute >=30| 0.6 0.2 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.0 | 1.7
Max 2-Minute >=40| 0.0 0.0 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.2
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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.