STATION: GLASGOW INTL AIRPORT (KGGW), MT
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 | 24.4 29.7 41.8 57.8 67.4 75.0 86.9 85.3 72.8 56.9 40.4 28.1 | 55.5
Avg Min Temp | 4.4 10.1 19.9 31.9 41.4 50.7 58.0 55.9 45.3 32.3 19.3 8.4 | 31.5
Avg Temperature | 14.4 19.9 30.8 44.8 54.4 62.9 72.4 70.6 59.1 44.6 29.9 18.2 | 43.5
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Extremes: | |
Extreme Max Temp| 61 66 77 87 96 99 106 103 99 88 79 62 | 106
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Date of Ext-Day | 08 22 12 27 18 27 24 19 04 02 12 11 |
-Year| 2002 2002 2007 2001 2006 2002 2007 2008 1998 1997 1999 2004 |
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Extreme Min Temp| -34 -27 -27 4 20 32 45 38 24 1 -20 -36 | -36
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Date of Ext-Day | 27 24 09 03 01 03 08 10 30 31 23 25 |
-Year| 1997 2003 2002 2002 2002 1998 1996 1997 2003 2006 1996 1996 |
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Heating Degree Days | 1570 1274 1059 606 339 121 11 28 221 634 1054 1450 | 8366
Cooling Degree Days | 0 0 0 0 11 57 241 200 43 1 0 0 | 553
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.3 1.5 11.8 10.8 2.7 0.0 0.0 0.0 | 27.2
Max Temp >= 75 | 0.0 0.0 0.4 2.2 8.7 16.0 28.8 26.8 13.1 2.6 0.1 0.0 | 98.8
Max Temp <= 32 | 19.3 16.0 7.8 1.0 0.0 0.0 0.0 0.0 0.0 1.0 9.2 16.5 | 70.8
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Min Temp <= 32 | 30.8 28.2 28.1 14.9 4.2 0.1 0.0 0.0 1.4 14.9 27.1 30.9 | 180.6
Min Temp <= 20 | 26.4 21.4 13.0 3.2 0.2 0.0 0.0 0.0 0.0 2.8 14.1 24.8 | 105.9
Min Temp <= 0 | 11.5 6.2 2.9 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2.5 8.5 | 31.6
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Avg Dew Point Temp | 9.5 14.1 20.5 28.2 36.8 47.4 51.4 47.0 40.0 30.5 20.6 12.3 | 29.8
Avg Wet Bulb Temp | 13.3 18.2 26.8 37.6 46.0 54.4 60.1 57.3 49.0 38.1 26.2 16.5 | 37.0
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Avg Sea Level Pres | 30.15 30.12 30.09 30.04 30.00 29.95 29.92 29.94 29.99 30.07 30.13 30.13 | 30.04
(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 0.1 0.3 2.1 5.4 7.6 4.5 1.2 0.2 0.0 0.0 | 21.5
Heavy Fog | 4.4 3.8 2.4 1.2 0.7 0.4 0.4 0.1 0.5 1.5 2.7 3.0 | 21.2
Fog | 15.1 14.2 11.0 7.6 6.2 7.6 4.3 3.3 4.0 6.2 9.8 11.2 | 100.5
Hail | 0.1 0.0 0.2 0.1 0.2 0.1 0.3 0.2 0.1 0.0 0.0 0.0 | 1.2
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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 | 0.27 0.26 0.29 1.03 2.20 2.93 1.79 0.91 1.08 0.84 0.41 0.30 | 12.32
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Maximum Daily | 0.20 0.64 0.30 1.04 1.69 2.82 1.37 1.45 1.12 1.22 0.48 0.21 | 2.82
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Date of Ext-Day | 05 28 29 25 01 16 01 28 16 10 06 26 |
-Year| 1999 2006 2000 1998 2008 2007 1997 1997 1996 1998 2000 2003 |
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Avg Number of Days: | |
>= 0.01 | 5.8 5.3 5.8 7.7 9.9 12.7 7.9 6.8 6.9 6.2 6.1 6.1 | 87.2
>= 0.10 | 0.8 0.7 0.9 3.9 5.2 6.5 4.0 3.3 2.6 2.1 1.6 1.0 | 32.7
>= 0.25 | 0.0 0.1 0.2 1.1 3.4 3.5 1.9 0.8 1.5 0.8 0.2 0.0 | 13.5
>= 0.50 | 0.0 0.1 0.0 0.2 1.1 1.5 1.2 0.3 0.5 0.5 0.0 0.0 | 5.5
>= 1.00 | 0.0 0.0 0.0 0.1 0.3 0.6 0.5 0.1 0.1 0.1 0.0 0.0 | 1.8
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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| 9.2 9.3 11.5 11.9 12.4 11.0 10.3 10.7 10.3 10.2 9.3 9.3 | 10.4
Daily Avg Max 2-Min | 19.4 19.0 22.4 24.2 25.3 23.5 23.2 22.8 21.5 21.2 19.7 19.7 | 21.8
Daily Avg Peak Gust | 22.6 21.9 26.6 29.4 31.1 29.2 28.8 28.1 26.2 25.4 23.3 22.9 | 26.3
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Maximum Daily Avg | 26.4 23.4 30.1 27.0 30.6 29.7 22.5 23.0 26.5 25.9 29.0 31.4 | 31.4
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Maximum 2-Minute Avg| 56 46 48 52 44 54 68 66 46 54 45 53 | 68
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Date of Max 2min-Day| 03 11 24 05 20 29 03 28 15 31 04 27 |
-Year| 2003 2002 2008 2000 2001 2002 2000 1997 1997 1999 1999 2000 |
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Maximum Peak Gust | 66 56 62 62 62 66 82 76 54 66 56 66 | 82
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Date of Max Gust-Day| 03 11 24 05 18 29 03 28 10 31 18 27 |
-Year| 2003 2002 2008 2000 2008 2002 2000 1997 2005 1999 2007 2000 |
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Avg Number of Days: | |
Peak Gust >=30 | 6.4 5.3 10.2 13.2 15.9 13.4 12.6 12.5 9.0 9.2 6.6 7.2 | 121.4
Peak Gust >=40 | 1.8 1.2 2.9 4.0 5.4 4.1 3.9 2.7 1.6 2.5 2.1 2.0 | 34.2
Peak Gust >=50 | 0.2 0.3 0.3 0.5 0.4 1.0 1.0 0.7 0.2 0.2 0.4 0.5 | 5.7
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Max 2-Minute >=30| 3.8 2.5 4.8 6.9 9.0 6.6 5.5 4.7 3.4 4.0 3.5 0.0 | 54.8
Max 2-Minute >=40| 0.3 0.3 0.7 0.8 0.8 1.0 1.1 0.8 0.2 0.4 0.6 0.0 | 6.8
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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.