STATION: PORTLAND-TROUTDALE AIRPORT (KTTD), OR
CLIMATOLOGICAL SUMMARY. Period of Record: Jul 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 | 45.8 50.4 55.8 61.0 67.4 73.5 81.4 81.3 75.9 63.2 52.6 45.5 | 62.8
Avg Min Temp | 36.3 36.9 39.1 41.9 46.9 51.7 56.1 55.4 50.2 45.3 40.9 36.8 | 44.8
Avg Temperature | 41.0 43.7 47.5 51.4 57.2 62.6 68.7 68.4 63.0 54.2 46.8 41.1 | 53.8
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Extremes: | |
Extreme Max Temp| 67 66 76 86 96 102 105 106 95 81 71 63 | 106
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Date of Ext-Day | 18 22 11 26 22 26 21 13 02 01 13 14 |
-Year| 2005 2002 2005 2004 2001 2006 2006 2002 2003 2001 1999 2002 |
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Extreme Min Temp| 17 18 26 27 34 41 45 44 37 30 25 16 | 16
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Date of Ext-Day | 06 20 01 02 10 03 05 28 27 30 12 20 |
-Year| 2004 2006 2002 2008 1999 1999 1999 2000 1999 2006 2000 1998 |
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Heating Degree Days | 742 602 544 408 256 114 17 16 97 335 546 740 | 4419
Cooling Degree Days | 0 0 0 1 14 42 132 122 38 2 0 0 | 350
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.5 2.5 4.8 4.7 1.5 0.0 0.0 0.0 | 14.0
Max Temp >= 75 | 0.0 0.0 0.1 2.2 6.4 11.6 24.1 24.7 16.0 2.0 0.0 0.0 | 87.2
Max Temp <= 32 | 1.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.3 | 2.6
| |
Min Temp <= 32 | 6.7 5.5 3.3 1.4 0.0 0.0 0.0 0.0 0.0 0.6 3.0 6.0 | 26.5
Min Temp <= 20 | 0.4 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 | 1.2
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 | 35.1 35.1 39.0 41.1 46.1 50.2 54.1 54.3 50.0 45.4 40.1 34.9 | 43.8
Avg Wet Bulb Temp | 38.5 40.0 43.4 46.3 51.4 55.6 59.9 59.9 55.7 49.5 43.7 38.5 | 48.5
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Avg Sea Level Pres | 30.13 30.13 30.10 30.05 30.06 30.04 30.02 30.01 30.01 30.09 30.13 30.17 | 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 | 1.2 0.1 1.3 1.2 0.6 0.6 0.4 0.5 0.6 0.5 0.5 1.2 | 8.7
Heavy Fog | 3.5 2.8 1.9 0.9 0.2 0.2 0.1 0.2 0.6 2.7 3.0 1.0 | 17.2
Fog | 21.0 16.4 17.9 13.3 11.5 9.2 6.5 6.5 8.7 16.8 17.9 17.1 | 162.5
Hail | 0.2 0.2 0.4 0.0 0.1 0.0 0.0 0.0 0.0 0.3 0.1 0.1 | 1.4
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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 | 6.03 3.93 4.51 3.17 2.49 1.91 0.42 0.83 1.57 3.11 6.32 6.52 | 40.81
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Maximum Daily | 2.51 1.24 1.34 0.88 1.01 1.88 0.43 1.61 2.09 1.19 1.80 2.19 | 2.51
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Date of Ext-Day | 31 27 07 30 31 24 08 29 30 31 19 13 |
-Year| 2003 1999 2003 2001 2005 1999 2005 2005 2005 2005 2003 2003 |
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Avg Number of Days: | |
>= 0.01 | 20.4 16.2 19.1 17.1 14.2 9.8 4.2 4.4 5.9 15.3 18.8 19.1 | 164.5
>= 0.10 | 15.3 10.0 12.6 9.8 8.1 5.2 1.8 1.9 3.3 8.7 13.4 14.6 | 104.7
>= 0.25 | 8.5 5.9 6.6 5.0 3.2 2.4 0.4 1.3 1.7 4.8 8.7 9.5 | 57.9
>= 0.50 | 3.9 2.4 2.2 1.4 0.7 0.9 0.0 0.5 1.0 1.5 4.7 4.4 | 23.7
>= 1.00 | 0.5 0.4 0.5 0.0 0.1 0.2 0.0 0.1 0.3 0.1 1.2 0.8 | 4.2
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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| 12.4 10.7 7.2 5.9 4.8 4.6 4.3 4.0 4.3 5.7 9.7 12.7 | 7.2
Daily Avg Max 2-Min | 23.3 21.5 17.8 15.8 13.9 13.0 11.9 11.9 12.8 15.5 20.8 24.1 | 16.9
Daily Avg Peak Gust | 28.9 26.7 22.1 20.2 18.2 17.2 16.0 16.0 17.2 20.2 26.1 30.0 | 21.6
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Maximum Daily Avg | 30.7 26.8 23.8 21.3 15.8 12.6 9.4 11.5 20.1 24.2 32.2 31.1 | 32.2
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Maximum 2-Minute Avg| 41 38 36 35 35 30 24 25 30 59 41 51 | 59
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Date of Max 2min-Day| 06 07 08 28 02 09 15 03 22 23 30 20 |
-Year| 2004 2007 2006 2001 2007 2008 2007 2008 2000 2006 2002 2008 |
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Maximum Peak Gust | 51 49 44 43 45 39 31 35 87 87 49 67 | 87
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Date of Max Gust-Day| 16 06 03 28 02 09 15 25 23 22 30 20 |
-Year| 2000 1999 1999 2000 2007 2002 2007 2004 2003 2003 2002 2008 |
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Avg Number of Days: | |
Peak Gust >=30 | 16.3 12.3 6.7 3.3 1.6 0.9 0.2 0.3 2.4 5.4 12.3 17.9 | 79.6
Peak Gust >=40 | 4.9 1.2 0.5 0.3 0.1 0.0 0.0 0.0 0.1 0.6 2.6 4.4 | 14.6
Peak Gust >=50 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.0 0.2 | 0.7
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Max 2-Minute >=30| 8.6 4.3 1.2 0.4 0.2 0.1 0.0 0.0 0.2 1.1 4.3 0.0 | 20.5
Max 2-Minute >=40| 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.1 0.0 | 0.3
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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.