STATION: BUTTE-BERT MOONEY AIRPORT (KBTM), 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 | 31.8 35.3 43.8 51.6 61.5 69.7 83.1 80.5 68.3 55.2 41.4 30.7 | 54.4
Avg Min Temp | 8.0 9.6 18.9 26.0 33.9 41.0 46.5 43.7 35.6 26.7 16.5 7.5 | 26.2
Avg Temperature | 19.9 22.4 31.4 38.8 47.7 55.3 64.8 62.1 52.0 41.0 28.9 19.1 | 40.3
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Extremes: | |
Extreme Max Temp| 57 57 68 76 88 100 98 99 93 79 70 53 | 100
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Date of Ext-Day | 23 03 30 29 28 30 30 03 04 22 12 10 |
-Year| 2005 2005 2004 2007 2003 2000 2000 2000 1998 2003 1999 2004 |
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Extreme Min Temp| -38 -37 -19 -1 17 28 31 27 17 -11 -19 -39 | -39
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Date of Ext-Day | 12 24 02 03 09 05 05 31 23 31 05 21 |
-Year| 1997 2003 2002 2001 2002 1998 1999 2006 1996 2002 2003 1998 |
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Heating Degree Days | 1398 1203 1042 787 537 297 69 117 394 745 1083 1422 | 9093
Cooling Degree Days | 0 0 0 0 0 7 61 27 3 0 0 0 | 98
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.0 0.5 6.1 3.3 0.5 0.0 0.0 0.0 | 10.4
Max Temp >= 75 | 0.0 0.0 0.0 0.2 4.3 10.5 27.5 24.8 9.3 0.8 0.0 0.0 | 77.4
Max Temp <= 32 | 14.8 9.6 3.9 0.6 0.0 0.0 0.0 0.0 0.0 0.9 6.0 16.2 | 52.1
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Min Temp <= 32 | 30.3 28.2 29.8 25.4 12.9 2.9 0.1 0.5 10.1 23.7 28.3 30.4 | 222.7
Min Temp <= 20 | 24.5 22.1 15.5 5.4 0.7 0.0 0.0 0.0 0.1 5.7 17.8 25.4 | 117.0
Min Temp <= 0 | 8.2 5.8 1.5 0.1 0.0 0.0 0.0 0.0 0.0 0.3 3.7 9.2 | 28.8
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Avg Dew Point Temp | 12.3 12.0 18.6 24.1 30.4 37.5 40.4 38.1 32.8 25.7 17.3 11.9 | 25.1
Avg Wet Bulb Temp | 17.6 18.3 26.5 32.2 39.7 46.3 52.1 49.3 42.3 33.7 23.5 17.2 | 33.2
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Avg Sea Level Pres | 30.20 30.15 30.07 30.03 30.00 29.96 29.97 29.99 30.02 30.11 30.19 30.20 | 30.08
(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 0.0 0.5 3.8 7.9 8.4 6.7 1.8 0.4 0.0 0.1 | 29.4
Heavy Fog | 3.0 2.2 2.4 1.5 0.8 0.5 0.1 0.2 0.3 0.8 2.0 2.6 | 16.4
Fog | 9.2 8.0 7.8 8.5 5.2 3.6 1.2 1.9 2.8 4.4 7.8 8.7 | 69.0
Hail | 0.0 0.0 0.0 0.0 0.2 0.0 0.2 0.2 0.1 0.0 0.0 0.0 | 0.7
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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 | 0.49 0.41 0.50 1.51 1.94 2.31 1.03 1.25 0.99 0.74 0.53 0.54 | 12.25
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Maximum Daily | 0.58 0.38 0.35 1.09 1.22 1.35 1.02 0.84 0.86 0.52 0.72 0.74 | 1.35
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Date of Ext-Day | 01 12 31 05 24 04 19 22 05 05 18 25 |
-Year| 1997 2007 1997 2006 1997 2008 1997 2003 2007 2007 1996 1996 |
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Avg Number of Days: | |
>= 0.01 | 7.0 6.8 7.5 11.0 11.7 13.9 8.2 8.2 6.8 7.5 7.2 7.2 | 103.1
>= 0.10 | 1.9 1.5 1.7 4.7 5.8 6.2 3.6 3.8 2.6 2.6 1.6 1.5 | 37.6
>= 0.25 | 0.2 0.2 0.3 2.3 2.8 2.8 1.2 1.5 1.5 0.8 0.3 0.4 | 14.2
>= 0.50 | 0.1 0.0 0.0 0.5 0.6 1.2 0.2 0.8 0.5 0.1 0.1 0.2 | 4.2
>= 1.00 | 0.0 0.0 0.0 0.1 0.1 0.2 0.1 0.0 0.0 0.0 0.0 0.0 | 0.4
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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| 4.3 4.4 6.3 6.5 6.8 6.4 6.0 5.8 5.3 5.5 4.5 4.3 | 5.5
Daily Avg Max 2-Min | 14.2 14.4 18.9 19.9 20.6 20.9 20.9 20.7 17.9 17.5 14.9 14.7 | 17.9
Daily Avg Peak Gust | 18.0 18.0 24.3 25.5 26.5 27.0 27.2 26.9 22.9 22.4 18.9 18.5 | 23.0
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Maximum Daily Avg | 13.8 16.1 13.8 18.0 14.0 15.4 12.5 12.2 12.7 16.1 13.8 16.0 | 18.0
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Maximum 2-Minute Avg| 39 33 37 36 39 46 41 43 37 33 37 37 | 46
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Date of Max 2min-Day| 30 16 25 13 02 27 16 19 09 27 27 13 |
-Year| 2004 2007 2007 2004 2007 2002 2001 2008 2005 2003 2000 2008 |
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Maximum Peak Gust | 45 48 49 49 54 52 53 62 46 45 47 51 | 62
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Date of Max Gust-Day| 30 07 11 13 20 27 14 29 09 29 13 29 |
-Year| 2004 2008 2002 2004 2006 2002 2001 2006 2005 2003 2006 2008 |
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Avg Number of Days: | |
Peak Gust >=30 | 3.6 3.5 8.4 7.4 9.5 9.6 11.5 10.2 6.2 5.2 4.4 3.8 | 83.3
Peak Gust >=40 | 0.8 0.5 1.1 1.5 0.8 1.8 1.8 2.3 0.6 0.8 0.9 0.9 | 13.6
Peak Gust >=50 | 0.0 0.0 0.0 0.0 0.1 0.1 0.5 0.9 0.0 0.0 0.0 0.1 | 1.7
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Max 2-Minute >=30| 0.6 0.8 1.4 1.9 1.4 2.6 2.5 3.0 0.9 0.9 0.7 0.0 | 16.6
Max 2-Minute >=40| 0.0 0.0 0.0 0.0 0.0 0.1 0.3 0.3 0.0 0.0 0.0 0.0 | 0.6
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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.