STATION: GREYBULL SOUTH BIG HORN COUNTY ARPT (KGEY), WY
CLIMATOLOGICAL SUMMARY. Period of Record: Oct 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 | 30.7 37.5 51.3 61.2 70.8 81.6 93.7 89.4 75.5 60.4 45.8 31.6 | 60.8
Avg Min Temp | 5.7 11.6 23.3 32.9 42.8 51.4 59.2 55.2 43.4 32.2 19.1 7.4 | 32.0
Avg Temperature | 18.2 24.6 37.3 47.1 56.8 66.5 76.5 72.3 59.4 46.3 32.4 19.5 | 46.4
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Extremes: | |
Extreme Max Temp| 65 69 80 88 98 105 108 105 98 87 73 64 | 108
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Date of Ext-Day | 01 28 31 29 29 29 13 03 03 01 04 01 |
-Year| 2003 2006 2004 2007 2003 2002 2002 2001 2007 2001 1999 1998 |
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Extreme Min Temp| -33 -25 -12 5 20 36 44 36 27 9 -18 -21 | -33
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Date of Ext-Day | 22 09 09 21 09 11 12 31 29 31 30 21 |
-Year| 2008 2001 2002 2008 2002 2008 2008 2005 1999 2006 2006 1998 |
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Heating Degree Days | 1452 1143 859 539 278 71 2 11 202 581 977 1409 | 7523
Cooling Degree Days | 0 0 0 1 24 116 358 238 35 0 0 0 | 772
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 1.3 6.4 24.7 17.7 3.6 0.0 0.0 0.0 | 53.8
Max Temp >= 75 | 0.0 0.0 0.5 4.1 12.4 21.7 30.7 29.9 16.7 3.8 0.0 0.0 | 119.8
Max Temp <= 32 | 17.3 8.9 2.5 0.2 0.0 0.0 0.0 0.0 0.0 0.6 5.2 15.1 | 49.7
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Min Temp <= 32 | 31.0 28.1 27.6 14.6 3.2 0.0 0.0 0.0 1.8 15.9 27.6 31.0 | 181.0
Min Temp <= 20 | 28.9 21.6 9.4 1.5 0.1 0.0 0.0 0.0 0.0 1.5 14.3 27.5 | 104.8
Min Temp <= 0 | 9.1 5.2 0.8 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.2 8.1 | 25.5
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Avg Dew Point Temp | 11.0 14.1 20.4 26.0 34.4 41.3 45.1 42.3 36.1 29.0 19.3 11.5 | 27.5
Avg Wet Bulb Temp | 15.7 20.8 30.5 38.1 46.0 53.1 58.7 55.6 47.6 37.9 27.0 16.7 | 37.3
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Avg Sea Level Pres | 30.19 30.14 30.05 30.05 29.97 29.95 29.89 29.90 30.01 30.08 30.15 30.21 | 30.05
(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 0.0 0.2 0.9 2.1 3.9 4.5 4.1 1.9 0.0 0.0 0.0 | 17.7
Heavy Fog | 4.1 2.1 0.7 0.0 0.2 0.0 0.0 0.4 0.2 0.6 1.5 2.6 | 12.3
Fog | 11.3 8.5 7.1 3.7 3.3 2.5 0.4 1.2 3.1 4.1 5.0 8.5 | 58.7
Hail | 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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PRECIPITATION (In) | Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec | Year
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Average Monthly | 0.10 0.10 0.22 0.55 1.27 0.79 0.17 0.19 0.56 0.72 0.20 0.17 | 5.04
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Maximum Daily | 0.25 0.12 0.39 0.50 1.00 1.33 0.30 0.24 0.73 0.62 0.69 0.38 | 1.33
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Date of Ext-Day | 17 28 29 19 07 01 23 22 01 09 23 26 |
-Year| 2008 2004 2006 2005 2005 2002 2004 2007 2008 2006 2002 2008 |
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Avg Number of Days: | |
>= 0.01 | 2.0 2.6 3.5 5.3 7.6 6.2 2.9 3.8 4.8 5.5 3.2 2.6 | 50.0
>= 0.10 | 0.2 0.3 0.5 1.6 3.7 2.2 0.6 0.7 1.8 2.1 0.4 0.5 | 14.6
>= 0.25 | 0.1 0.0 0.2 0.8 1.8 0.9 0.1 0.0 0.8 1.2 0.1 0.1 | 6.1
>= 0.50 | 0.0 0.0 0.0 0.1 0.6 0.2 0.0 0.0 0.2 0.4 0.1 0.0 | 1.6
>= 1.00 | 0.0 0.0 0.0 0.0 0.1 0.1 0.0 0.0 0.0 0.0 0.0 0.0 | 0.2
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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| 4.2 5.7 7.7 8.9 8.9 8.1 7.1 6.8 6.7 6.3 5.3 5.0 | 6.7
Daily Avg Max 2-Min | 14.9 17.0 20.9 23.5 24.3 24.9 23.7 23.0 19.5 18.0 16.0 15.4 | 20.1
Daily Avg Peak Gust | 17.8 20.2 25.2 28.6 29.9 30.4 28.7 28.1 23.8 21.8 19.4 18.3 | 24.3
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Maximum Daily Avg | 20.4 22.2 32.7 23.8 28.5 21.4 19.7 17.7 23.2 25.9 24.9 27.6 | 32.7
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Maximum 2-Minute Avg| 59 52 51 51 48 53 47 47 45 52 55 49 | 59
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Date of Max 2min-Day| 28 13 28 23 21 07 07 21 19 29 11 13 |
-Year| 2008 2008 2007 2002 2008 2007 2007 2002 2000 2003 2003 1999 |
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Maximum Peak Gust | 68 62 61 61 62 63 60 58 54 62 64 77 | 77
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Date of Max Gust-Day| 28 13 28 23 10 07 07 05 19 29 11 26 |
-Year| 2008 2008 2007 2002 2007 2007 2005 2007 2000 2003 2003 2008 |
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Avg Number of Days: | |
Peak Gust >=30 | 4.9 6.3 9.4 12.7 16.0 14.7 13.1 13.5 8.0 7.5 5.5 5.5 | 117.1
Peak Gust >=40 | 1.2 2.2 3.5 4.8 4.8 5.1 4.5 5.2 3.0 1.6 2.0 2.4 | 40.4
Peak Gust >=50 | 0.3 0.5 0.6 0.5 1.1 1.2 1.0 0.7 0.3 0.3 0.5 0.6 | 7.7
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Max 2-Minute >=30| 2.3 3.6 5.6 7.2 8.1 8.1 7.0 7.4 4.8 3.6 3.2 0.0 | 61.0
Max 2-Minute >=40| 0.4 0.7 1.1 1.2 1.3 1.8 1.3 0.9 0.5 0.6 0.5 0.0 | 10.4
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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.