STATION: SAN FRANCISCO INTERNATIONAL AIRPORT (KSFO), CA
CLIMATOLOGICAL SUMMARY. Period of Record: Jul 1996 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 | 56.2 58.8 62.2 63.5 67.3 70.0 71.3 72.3 73.4 69.8 62.6 57.1 | 65.4
Avg Min Temp | 44.7 46.2 47.5 48.9 52.1 53.8 55.6 56.5 56.0 52.9 49.3 45.1 | 50.7
Avg Temperature | 50.5 52.5 54.9 56.2 59.7 61.9 63.4 64.4 64.7 61.4 56.0 51.1 | 58.1
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Extremes: | |
Extreme Max Temp| 81 74 83 90 96 105 97 94 95 94 79 80 | 105
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Date of Ext-Day | 05 27 11 26 15 14 22 09 12 08 02 18 |
-Year| 2000 2002 2005 2004 2008 2000 2006 2002 2003 1996 1997 2005 |
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Extreme Min Temp| 32 36 37 39 44 47 50 51 49 43 37 31 | 31
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Date of Ext-Day | 14 08 11 09 01 07 10 15 16 31 30 21 |
-Year| 2007 2003 2006 1999 2008 2008 1998 1996 2006 2002 2004 1998 |
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Heating Degree Days | 450 353 316 268 182 113 70 51 59 131 272 430 | 2694
Cooling Degree Days | 0 0 1 4 17 20 21 33 49 18 1 0 | 165
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.1 0.6 0.8 0.2 0.5 1.6 0.2 0.0 0.0 | 4.0
Max Temp >= 75 | 0.1 0.0 1.8 2.5 4.4 5.2 5.8 7.9 10.0 7.2 0.8 0.1 | 45.7
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
| |
Min Temp <= 32 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 | 0.4
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 | 44.5 45.4 45.8 45.7 48.7 50.5 53.6 54.6 53.4 49.9 48.4 44.6 | 48.8
Avg Wet Bulb Temp | 47.5 48.8 49.8 50.3 53.2 54.9 57.1 58.0 57.5 54.5 51.9 48.1 | 52.6
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Avg Sea Level Pres | 30.14 30.09 30.08 30.05 30.00 29.95 29.96 29.95 29.92 30.01 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| |
| |
Avg Number of Days: | |
Thunderstorms | 0.2 0.7 0.3 0.4 0.1 0.0 0.1 0.1 0.4 0.1 0.3 0.4 | 3.0
Heavy Fog | 1.8 0.8 0.3 0.1 0.0 0.0 0.0 0.0 0.2 0.5 1.0 1.2 | 5.8
Fog | 20.6 15.5 11.8 10.0 7.9 5.7 4.7 5.2 5.0 9.3 15.3 18.0 | 129.0
Hail | 0.2 0.1 0.1 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.1 | 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 | 4.16 4.61 1.86 1.62 0.50 0.08 0.00 0.05 0.06 0.82 2.32 4.82 | 20.90
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Maximum Daily | 2.54 2.92 0.94 1.31 0.49 0.18 0.01 0.56 0.13 1.65 1.58 2.60 | 2.92
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Date of Ext-Day | 25 02 05 12 27 03 16 19 09 19 08 29 |
-Year| 2008 1998 2006 2003 1998 1999 2001 1997 1999 2004 2002 2003 |
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Avg Number of Days: | |
>= 0.01 | 14.3 12.9 9.3 7.0 3.4 1.1 0.2 0.5 1.3 3.6 9.2 12.6 | 75.4
>= 0.10 | 7.7 8.6 5.3 4.3 1.8 0.4 0.0 0.1 0.2 1.5 4.4 7.6 | 42.0
>= 0.25 | 4.8 6.0 2.8 2.6 0.6 0.0 0.0 0.1 0.0 0.9 3.0 5.5 | 26.3
>= 0.50 | 2.6 3.2 1.2 0.8 0.0 0.0 0.0 0.1 0.0 0.5 1.5 3.1 | 13.0
>= 1.00 | 1.0 1.2 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.2 0.5 1.2 | 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| 6.7 8.3 10.2 12.4 13.5 13.9 12.7 12.2 10.4 9.0 7.0 7.2 | 10.3
Daily Avg Max 2-Min | 18.1 21.4 23.7 26.1 26.6 27.1 24.6 24.5 23.0 21.8 18.7 19.0 | 22.9
Daily Avg Peak Gust | 21.9 25.7 28.2 30.7 31.5 32.2 29.2 28.9 27.1 25.8 22.3 23.3 | 27.2
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Maximum Daily Avg | 25.1 26.6 22.8 27.6 26.5 28.6 21.2 23.0 22.0 25.3 21.0 27.5 | 28.6
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Maximum 2-Minute Avg| 54 60 46 48 46 47 40 38 39 45 51 48 | 60
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Date of Max 2min-Day| 04 27 16 19 12 05 31 16 16 29 07 15 |
-Year| 2008 2006 2000 2008 1999 2005 2006 2007 2003 2003 2002 2002 |
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Maximum Peak Gust | 68 71 51 58 54 58 49 48 52 52 66 64 | 71
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Date of Max Gust-Day| 04 27 16 19 12 07 06 16 16 29 07 01 |
-Year| 2008 2006 2000 2008 1999 2004 2005 2007 2003 2003 2002 2005 |
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Avg Number of Days: | |
Peak Gust >=30 | 5.9 7.9 11.5 15.6 18.5 19.0 14.6 13.7 7.5 7.1 5.2 7.3 | 133.9
Peak Gust >=40 | 1.8 3.2 2.0 3.5 3.6 3.9 1.0 0.6 0.5 0.9 1.3 3.1 | 25.6
Peak Gust >=50 | 0.6 0.8 0.1 0.5 0.3 0.7 0.0 0.0 0.1 0.1 0.2 1.3 | 4.7
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Max 2-Minute >=30| 2.8 4.3 5.0 7.5 8.2 9.2 3.6 3.5 2.3 2.2 2.0 0.0 | 50.7
Max 2-Minute >=40| 0.5 1.0 0.2 0.8 0.8 1.3 0.1 0.0 0.0 0.2 0.2 0.0 | 5.1
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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.