STATION: OAKLAND INTL AIRPORT (KOAK), CA
CLIMATOLOGICAL SUMMARY. Period of Record: Jan 2000 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 | 56.6 59.6 63.4 64.4 68.6 71.2 71.5 72.1 73.5 69.7 63.0 57.2 | 65.9
Avg Min Temp | 41.4 44.1 46.1 48.2 51.7 53.8 56.0 56.2 54.5 50.6 45.6 42.6 | 49.2
Avg Temperature | 49.0 51.9 54.8 56.3 60.2 62.5 63.7 64.2 64.0 60.2 54.3 49.9 | 57.6
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Extremes: | |
Extreme Max Temp| 69 72 86 88 99 100 98 93 98 93 85 69 | 100
| |
Date of Ext-Day | 08 27 10 26 15 14 22 09 13 26 15 08 |
-Year| 2007 2002 2004 2004 2008 2000 2006 2002 2003 2003 2008 2006 |
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Extreme Min Temp| 28 32 34 38 42 46 49 49 46 40 31 30 | 28
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Date of Ext-Day | 14 08 11 03 09 07 23 15 24 31 30 04 |
-Year| 2007 2003 2006 2001 2003 2005 2000 2000 2005 2002 2004 2004 |
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Heating Degree Days | 497 371 320 264 166 99 65 53 66 158 322 468 | 2847
Cooling Degree Days | 0 0 2 3 16 23 26 27 37 8 1 0 | 142
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.6 1.1 0.7 0.7 1.6 0.3 0.0 0.0 | 4.9
Max Temp >= 75 | 0.0 0.0 2.6 2.4 4.4 6.1 5.7 7.3 10.2 8.2 0.7 0.0 | 47.6
Max Temp <= 32 | 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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Min Temp <= 32 | 1.6 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.4 | 2.6
Min Temp <= 20 | 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
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 | 42.7 44.1 45.5 46.0 49.9 52.0 54.6 54.9 53.6 49.7 46.5 43.3 | 48.6
Avg Wet Bulb Temp | 46.1 48.1 49.9 50.8 54.2 56.2 57.9 58.2 57.6 54.2 50.5 47.0 | 52.6
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Avg Sea Level Pres | 30.16 30.09 30.09 30.06 30.00 29.96 29.96 29.95 29.94 30.01 30.12 30.14 | 30.04
(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 0.9 0.1 0.3 0.1 1.7 1.1 1.3 1.0 1.7 1.4 0.7 | 10.6
Heavy Fog | 1.2 0.8 0.3 0.1 0.0 0.1 0.0 0.1 0.4 1.1 1.1 1.2 | 6.6
Fog | 18.7 14.1 12.0 7.1 7.2 5.4 6.2 5.9 7.4 8.6 13.3 16.7 | 122.6
Hail | 0.1 0.3 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.7
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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 | 2.78 3.48 2.20 1.45 0.57 0.10 0.01 0.01 0.09 1.03 1.73 4.82 | 18.27
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Maximum Daily | 2.00 2.01 1.08 0.77 0.63 0.36 0.02 0.02 0.30 1.84 1.76 2.54 | 2.54
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Date of Ext-Day | 23 13 05 12 08 08 13 25 24 19 08 13 |
-Year| 2000 2000 2006 2003 2005 2005 2000 2000 2001 2004 2002 2002 |
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Avg Number of Days: | |
>= 0.01 | 12.2 12.2 9.5 7.0 3.1 1.0 0.4 0.9 2.1 6.0 10.0 12.7 | 77.1
>= 0.10 | 6.1 7.5 5.8 4.2 1.6 0.4 0.0 0.0 0.3 2.4 3.5 7.8 | 39.6
>= 0.25 | 3.6 4.7 3.3 2.2 1.2 0.1 0.0 0.0 0.1 1.3 1.8 6.2 | 24.6
>= 0.50 | 1.1 2.7 1.3 0.9 0.2 0.0 0.0 0.0 0.0 0.6 1.0 4.2 | 12.0
>= 1.00 | 0.4 0.6 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.4 1.0 | 2.7
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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| 6.4 7.7 8.6 10.2 10.2 10.0 9.8 9.1 8.0 7.0 5.9 7.1 | 8.3
Daily Avg Max 2-Min | 16.2 18.3 19.8 21.5 20.3 20.2 19.3 18.8 18.0 16.9 15.5 17.4 | 18.5
Daily Avg Peak Gust | 19.2 21.7 23.0 25.1 23.9 23.3 22.4 21.7 20.8 20.0 18.7 20.9 | 21.7
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Maximum Daily Avg | 22.4 24.8 19.8 20.8 20.8 19.4 15.6 14.3 21.3 17.6 23.3 21.9 | 24.8
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Maximum 2-Minute Avg| 43 45 40 41 35 32 28 31 39 52 46 44 | 52
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Date of Max 2min-Day| 04 22 07 14 28 05 26 19 19 22 24 14 |
-Year| 2008 2002 2002 2002 2004 2007 2000 2000 2007 2000 2001 2002 |
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Maximum Peak Gust | 62 51 46 48 38 37 33 35 48 62 55 51 | 62
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Date of Max Gust-Day| 04 22 14 14 02 05 23 19 19 22 07 14 |
-Year| 2008 2002 2005 2002 2001 2007 2007 2000 2007 2000 2002 2002 |
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Avg Number of Days: | |
Peak Gust >=30 | 3.6 5.7 5.5 6.3 3.1 1.7 0.6 0.2 0.7 1.6 2.0 5.1 | 36.0
Peak Gust >=40 | 0.5 1.4 0.7 1.0 0.0 0.0 0.0 0.0 0.1 0.3 0.6 1.5 | 6.0
Peak Gust >=50 | 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.5 | 1.1
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Max 2-Minute >=30| 1.4 2.9 1.8 2.5 0.9 0.5 0.0 0.1 0.1 0.2 0.7 0.0 | 11.0
Max 2-Minute >=40| 0.1 0.3 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.0 | 1.1
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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.