STATION: TACOMA NARROWS AIRPORT (KTIW), WA
CLIMATOLOGICAL SUMMARY. Period of Record: Jan 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
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Avg Max Temp | 46.3 48.9 52.2 57.4 63.4 69.2 74.9 74.7 68.6 58.8 50.3 45.6 | 59.2
Avg Min Temp | 37.4 37.1 39.3 41.9 46.8 51.3 54.7 55.0 51.2 46.6 40.8 37.5 | 45.0
Avg Temperature | 41.8 43.0 45.7 49.7 55.1 60.3 64.8 64.8 59.9 52.7 45.5 41.5 | 52.1
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Extremes: | |
Extreme Max Temp| 62 68 76 80 88 94 97 91 88 92 64 61 | 97
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Date of Ext-Day | 19 26 29 16 27 13 24 09 04 16 15 14 |
-Year| 2005 2008 2004 1999 2005 2002 2004 2004 2003 2000 2001 2002 |
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Extreme Min Temp| 19 26 30 33 36 43 47 48 41 33 20 20 | 19
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Date of Ext-Day | 12 17 07 01 06 08 02 28 23 31 29 20 |
-Year| 2007 2006 1999 1999 2002 2002 1999 2000 2000 2003 2006 2008 |
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Heating Degree Days | 718 622 597 460 311 166 58 46 161 382 584 727 | 4832
Cooling Degree Days | 0 0 0 0 4 24 52 41 8 1 0 0 | 130
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.0 0.3 0.9 0.2 0.0 0.1 0.0 0.0 | 1.5
Max Temp >= 75 | 0.0 0.0 0.1 0.6 2.6 7.2 15.7 15.3 5.3 0.1 0.0 0.0 | 46.9
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 0.5 | 1.1
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Min Temp <= 32 | 5.2 4.4 1.5 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.6 4.1 | 17.8
Min Temp <= 20 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 | 0.3
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 | 37.6 36.7 38.4 39.8 44.0 48.0 51.7 52.6 49.6 45.7 40.9 37.5 | 43.5
Avg Wet Bulb Temp | 39.9 40.2 42.2 44.7 49.2 53.3 56.7 57.5 53.9 49.0 43.4 39.8 | 47.5
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Avg Sea Level Pres | 30.10 30.12 30.09 30.05 30.07 30.04 30.05 30.02 30.04 30.11 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 | 2.7 2.4 1.4 1.8 1.2 1.2 0.2 1.4 0.9 2.8 0.3 1.7 | 18.0
Heavy Fog | 7.1 5.3 2.3 1.1 0.6 0.6 0.6 1.8 3.1 6.0 6.0 6.4 | 40.9
Fog | 22.7 18.0 16.5 11.8 9.4 8.2 5.0 8.0 11.5 18.1 19.2 20.1 | 168.5
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
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Average Monthly | 7.16 3.64 4.11 2.48 1.84 1.49 0.54 1.02 1.09 3.50 6.92 5.98 | 39.76
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Maximum Daily | 2.30 1.43 1.75 1.20 0.83 1.33 0.87 1.64 0.78 5.52 3.33 2.21 | 5.52
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Date of Ext-Day | 17 01 26 13 27 27 16 22 30 20 06 03 |
-Year| 2005 2000 2005 2002 2004 2001 1999 2001 2007 2003 2006 2007 |
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Avg Number of Days: | |
>= 0.01 | 24.1 17.0 20.0 14.8 12.6 9.2 3.9 6.3 9.7 17.4 20.7 21.3 | 177.1
>= 0.10 | 15.0 9.2 10.8 7.7 5.7 3.5 1.8 2.3 3.4 7.2 12.0 13.3 | 91.9
>= 0.25 | 9.0 5.3 6.2 3.5 2.4 1.6 0.8 1.3 1.2 4.4 8.1 8.3 | 52.2
>= 0.50 | 4.8 2.2 2.4 1.1 0.7 0.6 0.1 0.6 0.4 1.6 4.0 3.2 | 21.7
>= 1.00 | 1.5 0.3 0.5 0.1 0.0 0.2 0.0 0.1 0.0 0.3 2.0 1.1 | 6.2
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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| 6.9 6.6 7.3 6.5 6.4 6.3 5.8 5.3 5.2 6.0 6.3 6.6 | 6.3
Daily Avg Max 2-Min | 16.2 15.7 16.4 14.9 14.1 13.7 12.6 12.3 13.0 14.3 15.5 16.3 | 14.6
Daily Avg Peak Gust | 21.1 20.6 21.4 19.5 18.6 18.0 16.5 16.0 16.7 18.4 20.4 21.6 | 19.1
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Maximum Daily Avg | 19.0 20.3 20.6 15.6 13.5 13.8 11.7 12.5 15.1 18.4 21.4 20.2 | 21.4
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Maximum 2-Minute Avg| 37 38 37 32 24 23 22 24 36 32 33 40 | 40
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Date of Max 2min-Day| 16 07 03 29 02 05 28 04 24 22 18 14 |
-Year| 2000 2008 1999 2001 2002 1999 2001 2002 1999 2001 2003 2006 |
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Maximum Peak Gust | 47 51 54 38 35 35 29 31 45 45 47 56 | 56
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Date of Max Gust-Day| 16 04 03 29 02 09 28 04 24 17 12 14 |
-Year| 2000 2006 1999 2001 2002 2008 2001 2002 1999 2003 2007 2006 |
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Avg Number of Days: | |
Peak Gust >=30 | 5.7 4.4 4.3 1.7 1.1 0.7 0.0 0.1 0.5 2.8 5.2 7.7 | 34.3
Peak Gust >=40 | 0.8 0.7 0.5 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.9 1.8 | 5.2
Peak Gust >=50 | 0.0 0.2 0.1 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| 1.3 1.2 0.7 0.1 0.0 0.0 0.0 0.0 0.1 0.6 0.8 0.0 | 4.8
Max 2-Minute >=40| 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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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.