STATION: CHEYENNE AIRPORT (KCYS), WY
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 | 39.7 40.7 48.3 54.8 65.7 76.0 85.6 81.4 72.0 59.3 47.4 38.9 | 59.1
Avg Min Temp | 18.3 18.8 24.2 30.6 40.0 48.6 56.7 54.1 44.9 34.0 24.9 18.1 | 34.4
Avg Temperature | 29.0 29.8 36.3 42.7 52.8 62.3 71.2 67.8 58.4 46.6 36.1 28.5 | 46.8
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Extremes: | |
Extreme Max Temp| 66 67 74 80 91 97 98 98 92 82 75 66 | 98
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Date of Ext-Day | 20 23 31 29 29 25 31 01 05 01 15 01 |
-Year| 2005 2002 2004 2007 2000 2007 2002 2008 1998 2005 1999 1998 |
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Extreme Min Temp| -14 -19 -11 0 19 31 40 40 23 8 -3 -20 | -20
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Date of Ext-Day | 12 17 02 12 03 08 04 28 27 30 11 07 |
-Year| 1997 2006 2002 1997 2008 2007 1997 2004 1996 2002 2000 2005 |
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Heating Degree Days | 1116 996 891 670 382 135 11 35 222 570 867 1133 | 7027
Cooling Degree Days | 0 0 0 0 5 54 202 121 25 0 0 0 | 408
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.2 2.3 10.5 3.5 0.5 0.0 0.0 0.0 | 17.1
Max Temp >= 75 | 0.0 0.0 0.0 0.9 6.8 17.7 28.9 25.9 14.0 3.6 0.1 0.0 | 97.9
Max Temp <= 32 | 7.7 6.3 4.2 1.8 0.0 0.0 0.0 0.0 0.1 0.8 4.6 9.1 | 34.5
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Min Temp <= 32 | 28.6 26.9 26.0 17.0 5.2 0.2 0.0 0.0 1.2 12.3 23.6 28.5 | 169.5
Min Temp <= 20 | 17.2 15.1 8.9 3.0 0.2 0.0 0.0 0.0 0.0 1.4 9.0 17.5 | 72.4
Min Temp <= 0 | 2.0 1.3 0.3 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.5 2.2 | 6.4
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Avg Dew Point Temp | 13.1 13.9 18.6 24.5 33.9 40.8 45.8 46.1 37.7 27.8 18.0 13.0 | 27.8
Avg Wet Bulb Temp | 23.7 24.1 29.3 34.9 43.5 50.7 56.5 54.8 47.5 37.8 28.9 23.3 | 37.9
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Avg Sea Level Pres | 30.08 30.08 30.04 30.06 29.97 29.92 29.93 29.95 29.96 30.03 30.09 30.09 | 30.02
(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 | 0.0 0.1 0.3 1.9 6.4 9.7 10.2 9.0 4.1 0.6 0.2 0.0 | 42.6
Heavy Fog | 1.7 3.1 4.3 4.2 2.0 1.6 0.8 0.9 1.5 2.2 2.3 1.8 | 26.5
Fog | 8.2 9.5 12.2 10.4 9.9 7.1 5.2 5.6 6.5 7.1 7.0 7.2 | 95.8
Hail | 0.0 0.0 0.0 0.8 0.8 1.2 0.8 0.8 0.3 0.1 0.0 0.0 | 4.8
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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 | 0.18 0.23 0.72 1.51 1.65 1.86 2.07 1.86 1.56 0.72 0.28 0.33 | 12.99
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Maximum Daily | 0.17 0.33 0.51 1.62 0.95 1.45 1.92 2.07 1.42 0.96 0.33 0.52 | 2.07
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Date of Ext-Day | 16 28 24 30 17 12 03 15 19 13 15 07 |
-Year| 2001 2002 2007 1999 2000 2005 2006 2008 1997 2007 1996 2007 |
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Avg Number of Days: | |
>= 0.01 | 3.7 4.5 7.7 9.5 12.2 11.5 9.5 10.7 7.8 6.2 4.3 4.6 | 92.3
>= 0.10 | 0.6 0.7 2.3 3.4 4.6 4.3 4.9 4.3 3.8 2.3 0.9 1.4 | 33.6
>= 0.25 | 0.0 0.1 0.7 1.8 2.5 2.3 2.4 1.9 1.9 0.8 0.2 0.1 | 14.7
>= 0.50 | 0.0 0.0 0.1 0.8 0.8 0.8 1.2 0.9 1.1 0.1 0.0 0.1 | 5.9
>= 1.00 | 0.0 0.0 0.0 0.3 0.0 0.4 0.5 0.3 0.2 0.0 0.0 0.0 | 1.7
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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| 13.9 13.6 13.6 13.1 12.0 11.1 9.8 9.9 10.3 11.6 12.9 14.2 | 12.1
Daily Avg Max 2-Min | 28.9 27.9 27.8 27.1 26.6 26.0 24.1 24.1 23.3 24.4 27.1 29.4 | 26.4
Daily Avg Peak Gust | 35.3 34.3 34.3 33.7 33.3 32.7 30.3 30.0 29.1 30.1 33.3 36.3 | 32.7
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Maximum Daily Avg | 26.7 32.2 33.5 31.4 28.4 24.2 22.0 19.0 20.6 24.6 31.7 32.6 | 33.5
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Maximum 2-Minute Avg| 55 59 59 55 54 52 46 49 48 53 59 63 | 63
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Date of Max 2min-Day| 11 02 06 08 17 11 28 20 05 23 26 28 |
-Year| 2000 1999 2004 1999 2005 2008 2001 1996 2000 2001 1999 1998 |
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Maximum Peak Gust | 69 71 69 69 67 66 59 60 60 63 68 75 | 75
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Date of Max Gust-Day| 30 02 06 08 02 06 31 20 08 23 26 28 |
-Year| 2003 1999 2004 1999 2008 2005 1996 1996 2000 2001 1999 1998 |
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Avg Number of Days: | |
Peak Gust >=30 | 20.2 17.1 19.6 18.1 20.1 18.2 14.8 14.1 13.1 13.6 17.7 21.2 | 207.8
Peak Gust >=40 | 11.1 8.7 9.0 8.4 6.4 5.9 3.4 3.5 3.5 4.7 7.7 12.2 | 84.6
Peak Gust >=50 | 3.9 3.5 2.7 1.5 1.4 1.6 0.6 0.4 0.4 1.0 2.6 4.2 | 23.8
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Max 2-Minute >=30| 14.2 10.6 12.9 11.1 9.2 7.2 5.6 5.6 5.4 7.1 10.6 0.0 | 99.5
Max 2-Minute >=40| 5.1 3.6 2.9 2.0 1.4 1.6 0.5 0.5 0.4 0.9 3.0 0.0 | 21.9
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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.