STATION: SANTA ROSA-SONOMA COUNTY AIRPORT (KSTS), CA
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 | 56.5 60.2 65.4 67.8 75.7 81.6 83.8 84.2 82.3 76.0 64.2 56.9 | 71.2
Avg Min Temp | 36.9 39.1 40.7 42.2 46.4 50.2 51.7 51.6 49.3 44.6 41.0 36.8 | 44.2
Avg Temperature | 46.7 49.6 53.0 55.0 61.1 65.9 67.8 67.9 65.8 60.3 52.6 46.9 | 57.7
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Extremes: | |
Extreme Max Temp| 75 79 89 94 102 108 108 106 104 100 89 78 | 108
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Date of Ext-Day | 23 16 16 26 15 14 22 03 19 01 14 19 |
-Year| 2006 2007 2004 2004 2008 2000 2006 1998 2000 2001 2008 1999 |
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Extreme Min Temp| 20 27 30 31 36 39 44 43 39 30 26 21 | 20
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Date of Ext-Day | 15 16 31 01 15 07 02 31 25 31 13 21 |
-Year| 2007 2006 2008 1999 1999 1999 2003 2008 2005 2002 2000 1998 |
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Heating Degree Days | 566 434 372 303 146 48 17 12 47 159 373 561 | 3040
Cooling Degree Days | 0 0 1 3 24 74 103 101 71 15 1 0 | 393
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.3 2.0 5.7 7.1 8.3 7.4 2.5 0.0 0.0 | 33.4
Max Temp >= 75 | 0.1 0.4 4.9 5.6 16.1 23.4 27.4 27.6 23.7 17.4 2.8 0.2 | 149.6
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
| |
Min Temp <= 32 | 9.3 4.5 1.1 0.9 0.0 0.0 0.0 0.0 0.0 0.1 3.5 10.3 | 29.7
Min Temp <= 20 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 | 0.1
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 | 41.0 42.0 42.8 43.4 47.1 49.5 52.9 52.5 49.8 45.3 44.9 40.8 | 46.0
Avg Wet Bulb Temp | 43.6 45.5 47.5 48.6 52.6 56.1 57.8 57.6 55.3 51.3 48.2 43.5 | 50.6
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Avg Sea Level Pres | 30.13 30.06 30.05 30.01 29.95 29.91 29.91 29.91 29.88 29.97 30.08 30.12 | 30.00
(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 | 0.6 0.3 0.5 0.1 0.5 0.6 0.5 0.0 0.3 0.3 0.5 0.9 | 5.1
Heavy Fog | 16.2 9.9 8.1 5.8 4.4 2.4 3.3 5.5 5.4 7.8 12.0 12.5 | 93.3
Fog | 24.9 22.6 20.4 18.0 16.1 13.8 16.3 17.5 16.1 17.3 21.9 23.8 | 228.6
Hail | 0.1 0.0 0.0 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 | 5.63 6.43 3.49 2.28 0.91 0.19 0.02 0.01 0.10 1.40 3.94 7.87 | 32.26
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Maximum Daily | 2.61 3.86 2.68 2.00 2.11 0.81 0.06 0.04 0.41 1.88 2.95 4.60 | 4.60
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Date of Ext-Day | 25 16 05 11 18 27 25 06 02 19 28 13 |
-Year| 2008 2004 2006 2006 2005 2001 2003 1999 2000 2004 2001 2002 |
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Avg Number of Days: | |
>= 0.01 | 20.3 17.7 13.0 9.7 4.4 1.5 0.6 0.6 2.8 7.9 16.3 18.2 | 113.0
>= 0.10 | 9.6 9.2 6.3 4.8 1.8 0.4 0.0 0.0 0.2 2.3 6.2 9.2 | 49.9
>= 0.25 | 6.4 6.9 4.5 3.2 1.0 0.3 0.0 0.0 0.1 1.5 3.8 7.3 | 35.0
>= 0.50 | 4.0 4.2 2.1 1.6 0.4 0.1 0.0 0.0 0.0 0.9 2.8 5.0 | 21.2
>= 1.00 | 1.7 2.1 0.8 0.4 0.2 0.0 0.0 0.0 0.0 0.5 1.2 2.7 | 9.6
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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| 3.5 4.5 5.1 5.4 5.8 5.9 5.4 5.0 4.4 4.0 3.4 3.8 | 4.7
Daily Avg Max 2-Min | 12.3 14.2 15.3 16.1 16.2 16.0 15.0 14.6 14.1 13.4 11.8 12.6 | 14.3
Daily Avg Peak Gust | 15.0 17.5 18.9 20.0 19.9 19.4 17.8 17.5 17.0 16.4 14.6 15.6 | 17.5
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Maximum Daily Avg | 15.4 15.3 13.6 16.6 15.5 14.0 7.7 10.4 11.5 15.7 13.1 16.5 | 16.6
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Maximum 2-Minute Avg| 39 33 30 37 29 28 32 21 28 37 36 40 | 40
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Date of Max 2min-Day| 06 09 04 03 25 08 06 30 29 22 20 16 |
-Year| 2003 1999 2001 1999 2000 2002 2007 1999 2007 2000 2004 2002 |
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Maximum Peak Gust | 54 45 39 45 37 35 36 30 33 43 45 54 | 54
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Date of Max Gust-Day| 04 09 04 03 20 03 18 30 19 22 07 31 |
-Year| 2008 1999 2001 1999 2008 2008 2007 1999 2007 2000 2002 2002 |
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Avg Number of Days: | |
Peak Gust >=30 | 1.7 2.6 1.8 1.4 1.7 1.0 0.2 0.3 0.4 1.1 1.1 3.4 | 16.7
Peak Gust >=40 | 0.2 0.2 0.0 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.4 0.7 | 1.7
Peak Gust >=50 | 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 | 0.3
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Max 2-Minute >=30| 0.2 0.3 0.1 0.1 0.0 0.0 0.1 0.0 0.0 0.1 0.4 0.0 | 1.3
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.