STATION: SAN JOSE INTL APT (KSJC), CA
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 | 58.4 61.3 65.8 67.6 73.8 78.4 80.6 80.7 80.0 74.3 65.5 59.1 | 70.5
Avg Min Temp | 41.3 43.5 45.7 47.5 52.0 55.5 58.2 58.2 56.9 52.2 46.4 41.7 | 49.9
Avg Temperature | 49.8 52.4 55.8 57.5 62.9 66.9 69.4 69.5 68.4 63.2 56.0 50.4 | 60.2
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Extremes: | |
Extreme Max Temp| 70 79 86 92 99 106 104 101 99 91 84 75 | 106
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Date of Ext-Day | 15 22 11 26 30 14 23 28 04 10 01 20 |
-Year| 2000 2002 2005 2004 2001 2000 2006 2008 2008 1999 2008 1999 |
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Extreme Min Temp| 27 31 35 36 42 45 50 51 46 41 33 24 | 24
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Date of Ext-Day | 14 11 28 09 08 08 04 15 30 31 23 24 |
-Year| 2007 1999 1999 1999 1999 1999 1999 1999 2007 2002 2003 1998 |
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Heating Degree Days | 471 356 289 234 107 30 6 3 14 87 272 453 | 2321
Cooling Degree Days | 0 0 2 10 41 87 142 142 117 32 1 0 | 575
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.3 1.2 2.8 3.4 3.1 4.4 0.6 0.0 0.0 | 15.7
Max Temp >= 75 | 0.0 0.4 3.7 4.9 11.9 19.4 25.6 26.1 21.6 13.4 1.9 0.1 | 129.0
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 | 1.5 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.1 | 2.8
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 | 39.9 42.3 43.2 43.9 48.0 51.1 55.4 54.9 52.3 47.4 44.5 40.0 | 46.9
Avg Wet Bulb Temp | 44.6 47.4 49.1 50.2 54.3 57.5 60.4 60.2 58.6 54.2 49.8 45.2 | 52.6
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Avg Sea Level Pres | 30.16 30.09 30.08 30.04 29.98 29.94 29.95 29.94 29.91 30.00 30.10 30.14 | 30.03
(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 0.4 0.3 0.1 0.1 0.0 0.0 0.7 1.4 1.2 1.5 0.3 | 6.2
Heavy Fog | 1.7 0.7 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.2 1.3 1.4 | 5.4
Fog | 17.3 12.4 9.6 7.3 4.5 2.4 4.6 5.5 6.1 7.5 12.2 15.1 | 104.4
Hail | 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.2
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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 | 2.42 2.64 1.48 1.09 0.30 0.06 0.01 0.01 0.05 0.61 1.16 2.22 | 12.05
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Maximum Daily | 1.76 1.26 0.74 0.75 0.59 0.18 0.04 0.06 0.18 1.02 0.93 1.24 | 1.76
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Date of Ext-Day | 24 15 20 13 02 07 31 03 24 12 07 14 |
-Year| 2000 2005 2006 2003 2003 2000 2000 1999 2001 2007 2002 2002 |
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Avg Number of Days: | |
>= 0.01 | 10.2 11.2 8.1 6.6 2.8 0.7 0.4 0.5 1.3 3.4 8.1 10.5 | 63.8
>= 0.10 | 5.1 7.0 5.2 4.2 0.8 0.3 0.0 0.0 0.1 1.4 2.8 5.3 | 32.1
>= 0.25 | 2.9 4.2 2.1 1.7 0.4 0.0 0.0 0.0 0.0 0.6 1.5 3.0 | 16.4
>= 0.50 | 1.5 1.7 0.7 0.3 0.1 0.0 0.0 0.0 0.0 0.5 0.6 1.5 | 7.0
>= 1.00 | 0.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.5 | 1.2
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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| 5.3 6.3 6.9 7.8 8.0 8.1 7.5 7.1 6.3 5.6 5.1 5.8 | 6.7
Daily Avg Max 2-Min | 14.8 16.7 18.2 19.8 19.7 19.6 17.3 17.1 16.9 16.1 14.5 15.9 | 17.2
Daily Avg Peak Gust | 18.0 20.2 21.9 23.9 23.5 23.4 20.4 20.4 20.0 19.3 17.5 19.5 | 20.7
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Maximum Daily Avg | 20.5 20.4 18.0 17.1 14.6 13.8 14.3 13.1 15.2 14.2 16.9 20.8 | 20.8
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Maximum 2-Minute Avg| 43 40 37 36 30 30 26 25 26 36 36 39 | 43
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Date of Max 2min-Day| 01 27 13 03 21 13 08 05 18 19 24 19 |
-Year| 2006 2006 2003 1999 2008 2004 2004 2002 2007 2004 2001 2002 |
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Maximum Peak Gust | 51 49 45 46 37 36 31 31 33 44 46 49 | 51
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Date of Max Gust-Day| 01 27 13 03 21 07 08 02 21 19 07 15 |
-Year| 2006 2006 2003 1999 2008 2004 2004 2008 2000 2004 2002 2002 |
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Avg Number of Days: | |
Peak Gust >=30 | 2.5 3.4 2.8 3.1 1.8 1.6 0.2 0.2 0.3 1.5 1.3 4.0 | 22.7
Peak Gust >=40 | 0.4 0.7 0.2 0.2 0.0 0.0 0.0 0.0 0.0 0.2 0.3 0.9 | 2.9
Peak Gust >=50 | 0.2 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.2
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Max 2-Minute >=30| 0.6 0.8 0.3 0.5 0.1 0.1 0.0 0.0 0.0 0.2 0.3 0.0 | 2.9
Max 2-Minute >=40| 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.2
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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.