STATION: CHINO AIRPORT (KCNO), CA
CLIMATOLOGICAL SUMMARY. Period of Record: Apr 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 | 67.8 67.3 70.6 73.5 79.9 85.8 92.8 93.8 90.0 82.0 74.2 67.8 | 78.8
Avg Min Temp | 38.7 40.6 43.0 45.4 51.7 55.6 60.1 60.0 56.5 50.5 43.2 37.7 | 48.6
Avg Temperature | 53.3 54.0 56.8 59.4 65.8 70.7 76.5 76.9 73.2 66.2 58.7 52.7 | 63.7
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Extremes: | |
Extreme Max Temp| 92 90 97 108 103 109 114 109 112 103 95 86 | 114
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Date of Ext-Day | 31 22 12 02 03 20 22 29 03 21 07 24 |
-Year| 2003 2002 2007 1998 2004 2008 2006 1998 2007 2003 2006 2005 |
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Extreme Min Temp| 20 27 28 31 32 38 50 51 47 39 27 23 | 20
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Date of Ext-Day | 14 01 03 02 30 19 17 08 20 18 13 24 |
-Year| 2007 2002 2002 1999 2002 2002 2000 1999 1999 1998 2000 1998 |
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Heating Degree Days | 364 312 261 186 49 9 0 0 3 48 199 381 | 1812
Cooling Degree Days | 1 1 6 19 74 178 355 368 250 86 9 1 | 1348
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Avg Number of Days: | |
Max Temp >= 90 | 0.1 0.1 0.6 2.0 4.6 11.2 22.1 23.6 16.2 8.0 1.4 0.0 | 89.9
Max Temp >= 75 | 7.5 6.2 9.8 11.7 22.0 26.7 31.0 30.9 28.6 22.7 14.6 7.4 | 219.2
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 | 4.2 2.2 0.9 0.2 0.1 0.0 0.0 0.0 0.0 0.0 1.0 5.8 | 14.4
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 | 38.0 40.4 44.3 46.2 51.4 55.5 59.2 58.8 55.6 48.8 42.9 36.8 | 48.2
Avg Wet Bulb Temp | 46.0 47.4 50.2 52.1 57.1 61.0 64.5 64.8 61.7 56.1 50.3 45.2 | 54.7
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Avg Sea Level Pres | 30.11 30.07 30.02 29.99 29.94 29.90 29.91 29.90 29.88 29.95 30.05 30.11 | 29.99
(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 | 1.3 1.0 1.4 0.7 0.5 0.8 1.2 0.4 1.1 0.9 0.7 0.3 | 10.3
Heavy Fog | 7.5 4.5 7.5 4.2 2.9 2.5 1.6 1.3 4.0 7.1 7.0 4.7 | 54.8
Fog | 22.0 20.9 24.3 23.8 23.8 24.5 22.0 23.9 23.1 23.3 20.8 19.0 | 271.3
Hail | 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.1 0.0 0.0 | 0.3
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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 | 1.59 2.86 0.97 0.92 0.10 0.04 0.03 0.00 0.05 0.89 0.59 0.85 | 8.89
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Maximum Daily | 2.97 2.65 1.64 1.11 0.48 0.25 0.18 0.03 0.18 2.62 1.16 1.74 | 2.97
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Date of Ext-Day | 09 12 15 04 22 02 05 31 20 20 30 15 |
-Year| 2005 2001 2003 2006 2006 1999 2001 1998 2005 2004 2007 2008 |
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Avg Number of Days: | |
>= 0.01 | 5.1 7.1 5.3 4.8 1.0 0.5 0.3 0.2 0.9 4.3 5.4 4.5 | 39.4
>= 0.10 | 2.5 4.7 2.5 2.0 0.2 0.2 0.1 0.0 0.3 1.0 1.2 2.0 | 16.6
>= 0.25 | 1.8 3.3 0.9 1.5 0.1 0.1 0.0 0.0 0.0 0.8 0.7 1.2 | 10.4
>= 0.50 | 1.0 1.8 0.5 0.6 0.0 0.0 0.0 0.0 0.0 0.6 0.5 0.4 | 5.4
>= 1.00 | 0.5 0.8 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.4 0.1 0.2 | 2.2
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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| 4.5 4.8 5.4 6.1 6.7 6.7 6.3 5.8 5.0 4.6 4.0 4.1 | 5.3
Daily Avg Max 2-Min | 15.2 15.7 17.0 18.1 18.7 18.3 18.1 17.6 16.8 15.7 14.4 14.0 | 16.6
Daily Avg Peak Gust | 18.7 19.1 20.9 22.0 22.6 22.1 21.9 21.5 20.4 19.3 17.9 17.5 | 20.3
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Maximum Daily Avg | 27.1 19.4 20.2 11.8 13.0 11.0 9.9 8.4 12.4 19.7 15.9 21.3 | 27.1
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Maximum 2-Minute Avg| 51 37 35 36 30 30 23 23 31 36 35 40 | 51
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Date of Max 2min-Day| 06 09 31 28 03 27 16 09 02 13 25 09 |
-Year| 2003 2002 2005 1999 2001 2006 2001 1999 1998 2008 2002 1998 |
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Maximum Peak Gust | 62 52 47 45 41 35 30 30 37 58 58 63 | 63
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Date of Max Gust-Day| 06 09 21 01 03 27 22 30 02 21 25 09 |
-Year| 2003 2002 2000 2000 2001 2006 2006 2007 1998 2007 2002 1998 |
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Avg Number of Days: | |
Peak Gust >=30 | 4.0 2.0 2.3 1.6 0.9 0.2 0.1 0.1 0.4 1.6 2.5 3.8 | 19.4
Peak Gust >=40 | 1.6 0.6 0.7 0.3 0.1 0.0 0.0 0.0 0.0 0.5 0.6 1.3 | 5.6
Peak Gust >=50 | 0.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.3 0.1 0.2 | 0.9
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Max 2-Minute >=30| 1.5 0.4 0.7 0.3 0.1 0.1 0.0 0.0 0.1 0.4 0.5 0.0 | 4.0
Max 2-Minute >=40| 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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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.