STATION: PORTLAND-HILLSBORO AIRPORT (KHIO), OR
CLIMATOLOGICAL SUMMARY. Period of Record: Jun 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 | 46.1 50.8 54.8 60.2 67.1 72.9 81.3 81.4 76.0 63.2 52.0 45.8 | 62.6
Avg Min Temp | 33.5 33.3 36.2 38.5 44.1 48.4 52.1 51.2 45.7 40.8 36.5 33.5 | 41.2
Avg Temperature | 39.8 42.1 45.5 49.4 55.6 60.6 66.7 66.3 60.9 52.0 44.3 39.6 | 51.9
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Extremes: | |
Extreme Max Temp| 64 65 77 87 94 102 108 103 97 81 67 60 | 108
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Date of Ext-Day | 18 27 29 26 22 26 21 15 02 01 13 12 |
-Year| 2005 2005 2004 2004 2001 2006 2006 2008 2006 2001 1999 1998 |
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Extreme Min Temp| 18 16 25 25 30 35 39 38 30 20 16 4 | 4
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Date of Ext-Day | 06 19 01 01 08 04 02 31 27 31 02 22 |
-Year| 2004 2006 2002 2008 2002 2001 2000 2008 1999 2002 2002 1998 |
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Heating Degree Days | 781 648 603 469 299 161 41 42 147 404 622 786 | 5002
Cooling Degree Days | 0 0 0 0 8 30 93 82 23 1 0 0 | 236
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.7 2.0 5.5 5.0 2.0 0.0 0.0 0.0 | 15.2
Max Temp >= 75 | 0.0 0.0 0.2 2.1 6.2 10.7 23.9 23.8 16.5 3.0 0.0 0.0 | 86.4
Max Temp <= 32 | 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 | 1.5
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Min Temp <= 32 | 13.5 13.6 8.5 4.4 0.6 0.0 0.0 0.0 0.2 3.5 9.9 13.4 | 67.4
Min Temp <= 20 | 1.1 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.4 0.9 | 2.9
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 | 36.1 35.6 39.1 41.0 45.8 49.6 52.9 52.6 48.7 43.7 38.9 35.2 | 43.3
Avg Wet Bulb Temp | 38.2 39.2 42.6 45.4 50.5 54.6 58.7 58.4 53.8 47.0 41.1 37.1 | 47.2
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Avg Sea Level Pres | 30.13 30.12 30.11 30.06 30.07 30.05 30.03 30.01 30.02 30.10 30.13 30.19 | 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 | 0.3 0.4 0.8 1.5 0.5 0.9 0.5 0.8 0.7 0.4 0.2 0.4 | 7.4
Heavy Fog | 9.6 4.7 3.2 2.3 0.6 0.4 0.2 0.6 2.5 9.5 8.0 6.5 | 48.0
Fog | 24.2 19.4 18.0 13.5 11.8 8.4 5.7 7.8 12.7 22.0 22.7 22.2 | 188.4
Hail | 0.1 0.0 0.0 0.1 0.0 0.1 0.0 0.0 0.0 0.0 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
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Average Monthly | 6.06 3.39 3.38 2.26 1.72 1.01 0.25 0.64 0.92 2.51 5.79 6.48 | 34.41
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Maximum Daily | 1.92 1.29 1.20 1.09 0.82 0.77 0.35 0.79 1.28 1.09 2.32 2.19 | 2.32
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Date of Ext-Day | 31 17 27 12 09 28 03 22 30 31 25 27 |
-Year| 2003 2003 2005 2003 2005 2002 1999 2004 2005 2005 1998 1998 |
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Avg Number of Days: | |
>= 0.01 | 22.0 16.0 19.1 16.3 12.5 8.5 2.9 3.9 6.2 15.4 20.6 22.1 | 165.5
>= 0.10 | 13.6 9.7 10.3 7.5 5.8 3.4 0.9 2.0 2.5 6.3 11.5 14.3 | 87.9
>= 0.25 | 8.9 4.7 4.5 2.8 2.3 1.1 0.3 0.8 1.0 3.4 7.3 9.4 | 46.5
>= 0.50 | 4.0 1.5 1.2 0.7 0.4 0.2 0.0 0.3 0.4 1.3 4.1 3.7 | 17.8
>= 1.00 | 0.8 0.5 0.3 0.1 0.0 0.0 0.0 0.0 0.1 0.4 1.0 1.1 | 4.3
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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| 4.7 5.1 5.3 5.2 4.7 5.0 5.1 4.7 4.2 3.8 4.5 5.0 | 4.8
Daily Avg Max 2-Min | 13.9 14.7 15.5 15.5 14.5 14.3 14.5 14.3 13.7 12.7 13.6 14.5 | 14.3
Daily Avg Peak Gust | 17.3 18.4 19.3 19.2 18.1 17.9 18.1 17.6 16.9 16.0 17.0 18.3 | 17.8
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Maximum Daily Avg | 19.3 21.7 16.7 15.2 11.6 11.4 9.4 11.8 13.7 13.4 16.4 18.6 | 21.7
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Maximum 2-Minute Avg| 37 35 36 28 28 26 25 23 28 30 39 39 | 39
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Date of Max 2min-Day| 16 03 03 23 02 15 20 14 25 28 05 14 |
-Year| 2000 2006 1999 2008 2007 1998 1999 2006 1999 1999 2008 2006 |
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Maximum Peak Gust | 52 48 44 40 36 32 30 36 36 39 58 54 | 58
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Date of Max Gust-Day| 04 04 02 23 02 15 30 29 21 28 05 14 |
-Year| 2008 2006 1999 2008 2007 1998 2007 2008 2000 1999 2008 2006 |
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Avg Number of Days: | |
Peak Gust >=30 | 3.2 3.6 3.1 1.8 0.6 0.4 0.1 0.3 0.7 1.6 2.8 4.6 | 22.9
Peak Gust >=40 | 0.6 0.6 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.4 0.9 | 2.8
Peak Gust >=50 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 0.2 | 0.5
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Max 2-Minute >=30| 0.5 0.7 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.5 0.0 | 2.2
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.