STATION: WALLA WALLA REGIONAL ARPT (KALW), WA
CLIMATOLOGICAL SUMMARY. Period of Record: Oct 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 | 41.9 47.2 55.8 62.3 70.6 78.9 90.5 88.1 77.6 63.3 49.1 41.0 | 63.8
Avg Min Temp | 30.9 32.8 38.0 41.4 48.3 54.2 62.1 61.0 52.5 42.8 35.5 29.7 | 44.1
Avg Temperature | 36.4 40.0 46.9 51.8 59.5 66.6 76.3 74.6 65.1 53.1 42.3 35.3 | 54.0
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Extremes: | |
Extreme Max Temp| 69 69 79 82 95 105 110 108 99 87 75 66 | 110
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Date of Ext-Day | 19 17 30 13 23 29 12 17 06 01 13 14 |
-Year| 2005 2007 2003 2008 2001 2008 2002 2008 2003 2008 1999 2002 |
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Extreme Min Temp| -12 11 25 27 32 41 46 46 33 15 14 -20 | -20
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Date of Ext-Day | 05 18 02 01 07 06 11 31 23 31 28 10 |
-Year| 2004 2006 2002 2008 2002 2005 2008 1999 2000 2002 2006 2000 |
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Heating Degree Days | 887 706 562 395 203 62 3 5 78 374 682 921 | 4879
Cooling Degree Days | 0 0 0 0 32 109 349 301 78 4 0 0 | 874
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 1.3 4.7 18.1 15.0 2.2 0.0 0.0 0.0 | 41.3
Max Temp >= 75 | 0.0 0.0 0.5 2.6 10.0 20.2 30.3 29.3 19.2 2.4 0.1 0.0 | 114.6
Max Temp <= 32 | 5.9 0.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.6 7.6 | 16.2
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Min Temp <= 32 | 17.3 13.8 4.4 1.8 0.1 0.0 0.0 0.0 0.0 2.3 10.3 19.4 | 69.6
Min Temp <= 20 | 2.8 0.6 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 1.0 3.9 | 8.6
Min Temp <= 0 | 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 | 0.6
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Avg Dew Point Temp | 29.9 31.2 33.8 36.8 42.2 45.3 45.1 45.1 41.2 38.4 34.6 29.5 | 37.7
Avg Wet Bulb Temp | 33.4 36.0 41.0 44.7 50.6 55.1 58.9 58.1 52.5 45.8 38.8 32.9 | 45.7
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Avg Sea Level Pres | 30.18 30.15 30.07 30.01 30.00 29.96 29.94 29.93 29.99 30.08 30.16 30.21 | 30.06
(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 | 0.2 0.2 0.1 0.7 1.6 1.6 1.2 1.6 0.4 0.5 0.1 1.2 | 9.4
Heavy Fog | 9.3 5.6 0.7 0.5 0.3 0.0 0.0 0.0 0.0 0.4 4.7 8.9 | 30.4
Fog | 18.3 11.3 6.9 4.9 4.6 3.1 0.1 0.8 1.6 4.2 13.1 18.0 | 86.9
Hail | 0.0 0.0 0.1 0.0 0.1 0.1 0.0 0.0 0.0 0.1 0.0 0.0 | 0.4
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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 | 2.16 1.69 2.04 1.76 1.76 1.05 0.13 0.37 0.66 1.13 2.32 2.31 | 17.40
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Maximum Daily | 1.07 1.61 0.97 0.92 1.10 0.75 0.21 0.60 1.69 0.71 1.09 0.99 | 1.69
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Date of Ext-Day | 31 23 25 15 31 05 19 22 08 20 06 13 |
-Year| 2003 2002 2006 2004 2000 2007 2007 2004 2003 2000 2006 2003 |
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Avg Number of Days: | |
>= 0.01 | 14.0 11.0 11.7 10.4 10.4 6.0 2.4 2.8 4.0 7.6 12.9 14.8 | 108.0
>= 0.10 | 6.5 5.4 6.1 4.9 4.7 3.2 0.4 1.3 1.9 3.4 6.7 7.2 | 51.6
>= 0.25 | 2.9 1.8 3.2 2.9 2.5 1.5 0.0 0.4 0.8 1.5 3.4 3.2 | 24.1
>= 0.50 | 0.9 0.5 1.1 0.7 0.7 0.6 0.0 0.2 0.2 0.6 0.8 0.7 | 7.0
>= 1.00 | 0.1 0.1 0.0 0.0 0.1 0.0 0.0 0.0 0.1 0.0 0.2 0.0 | 0.6
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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| 7.4 7.6 9.4 8.6 8.5 8.6 8.4 8.1 7.4 7.1 7.3 7.5 | 8.0
Daily Avg Max 2-Min | 17.1 17.3 19.8 18.9 18.5 17.7 17.1 17.3 15.3 15.9 16.8 17.7 | 17.4
Daily Avg Peak Gust | 20.5 20.7 23.8 22.8 22.4 22.0 21.2 21.2 18.8 19.2 20.2 21.2 | 21.2
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Maximum Daily Avg | 23.5 23.5 22.4 19.1 18.6 16.4 17.7 16.4 20.5 20.5 26.1 28.4 | 28.4
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Maximum 2-Minute Avg| 47 43 44 39 44 37 35 46 32 41 47 49 | 49
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Date of Max 2min-Day| 30 05 02 27 08 21 22 02 25 28 12 16 |
-Year| 2004 1999 1999 2004 2005 2008 2005 2004 1999 2003 2007 2002 |
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Maximum Peak Gust | 55 55 56 47 53 49 39 55 43 52 66 69 | 69
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Date of Max Gust-Day| 30 05 02 27 19 21 22 02 25 28 12 16 |
-Year| 2004 1999 1999 2004 2006 2008 2005 2004 1999 2003 2007 2002 |
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Avg Number of Days: | |
Peak Gust >=30 | 7.2 6.4 8.1 5.0 4.7 3.2 2.4 2.5 1.5 3.4 6.8 8.3 | 59.5
Peak Gust >=40 | 2.4 1.8 1.6 0.9 0.6 0.5 0.0 0.6 0.1 0.8 1.9 3.5 | 14.6
Peak Gust >=50 | 0.3 0.5 0.3 0.0 0.2 0.0 0.0 0.1 0.0 0.1 0.4 0.8 | 2.7
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Max 2-Minute >=30| 4.3 2.7 3.6 2.3 1.3 0.6 0.3 0.9 0.4 1.0 2.8 0.0 | 20.2
Max 2-Minute >=40| 0.5 0.6 0.2 0.0 0.3 0.0 0.0 0.1 0.0 0.1 0.4 0.0 | 2.2
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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.