STATION: DILLON AIRPORT (KDLN), MT
CLIMATOLOGICAL SUMMARY. Period of Record: Jun 1997 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
| |
Avg Max Temp | 32.9 36.8 46.0 54.3 63.6 71.5 84.8 82.0 70.6 57.0 42.8 32.1 | 56.2
Avg Min Temp | 14.2 16.2 22.6 28.9 37.0 43.3 50.2 47.6 40.3 30.7 21.2 13.1 | 30.4
Avg Temperature | 23.5 26.5 34.3 41.6 50.3 57.4 67.5 64.8 55.4 43.8 32.0 22.6 | 43.3
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Extremes: | |
Extreme Max Temp| 56 57 71 80 89 95 102 97 92 82 71 56 | 102
| |
Date of Ext-Day | 31 22 23 28 28 28 12 07 04 01 07 11 |
-Year| 2003 2002 2004 2007 2003 2007 2002 2001 1998 1997 2006 2004 |
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Extreme Min Temp| -29 -20 -15 9 20 30 34 30 18 -6 -16 -27 | -29
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Date of Ext-Day | 05 24 08 03 08 04 16 31 24 31 29 21 |
-Year| 2004 2003 2002 2002 2002 1998 1999 2006 2000 2002 2006 1998 |
| |
Heating Degree Days | 1285 1089 952 702 457 240 30 66 298 656 990 1315 | 8080
Cooling Degree Days | 0 0 0 0 2 12 108 60 10 0 0 0 | 192
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.0 0.7 7.7 4.0 0.3 0.0 0.0 0.0 | 12.7
Max Temp >= 75 | 0.0 0.0 0.0 0.4 5.7 12.6 28.9 26.6 11.7 1.5 0.0 0.0 | 87.3
Max Temp <= 32 | 12.6 8.2 2.6 0.3 0.1 0.0 0.0 0.0 0.0 0.8 5.5 14.4 | 44.4
| |
Min Temp <= 32 | 30.4 27.6 28.0 21.7 8.4 0.9 0.0 0.1 3.3 17.6 26.1 30.2 | 194.2
Min Temp <= 20 | 21.4 18.6 10.2 3.0 0.2 0.0 0.0 0.0 0.1 2.6 11.9 23.3 | 91.4
Min Temp <= 0 | 3.3 1.3 0.5 0.0 0.0 0.0 0.0 0.0 0.0 0.1 1.8 3.8 | 10.7
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Avg Dew Point Temp | 14.1 15.0 19.2 24.7 32.2 40.6 44.1 41.0 34.6 26.9 19.9 13.8 | 27.2
Avg Wet Bulb Temp | 20.4 22.3 28.4 34.3 41.7 48.4 54.1 51.4 44.7 36.0 27.3 19.9 | 35.7
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Avg Sea Level Pres | 30.16 30.12 30.06 30.02 29.96 29.94 29.94 29.96 29.99 30.07 30.14 30.20 | 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 | 0.1 0.0 0.1 0.8 3.6 5.2 6.5 4.0 0.8 0.2 0.0 0.0 | 21.4
Heavy Fog | 1.2 1.7 1.3 1.9 0.5 0.3 0.0 0.0 0.1 1.0 1.0 1.1 | 10.0
Fog | 7.5 8.2 6.8 8.8 5.9 5.2 1.9 2.7 2.4 4.8 5.6 6.1 | 65.8
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 | 0.23 0.31 0.41 1.10 1.83 1.95 0.80 0.88 0.84 0.89 0.28 0.28 | 9.79
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Maximum Daily | 0.30 0.37 0.55 0.72 1.02 1.58 1.23 0.83 0.54 0.86 0.34 0.48 | 1.58
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Date of Ext-Day | 14 01 27 05 22 06 17 15 06 07 25 03 |
-Year| 2000 2003 2007 2006 2008 2007 2007 1997 2001 2006 1997 1998 |
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Avg Number of Days: | |
>= 0.01 | 4.7 4.9 6.5 9.9 11.2 11.0 6.7 7.2 5.9 6.2 4.6 4.7 | 83.5
>= 0.10 | 0.7 0.8 1.3 3.0 5.1 4.8 2.7 2.6 2.9 2.8 0.7 0.8 | 28.3
>= 0.25 | 0.1 0.2 0.1 1.4 2.7 3.0 1.1 1.3 1.1 1.2 0.4 0.2 | 12.8
>= 0.50 | 0.0 0.0 0.1 0.4 0.9 1.1 0.1 0.3 0.2 0.4 0.0 0.0 | 3.4
>= 1.00 | 0.0 0.0 0.0 0.0 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| 10.3 9.7 10.1 9.5 9.0 8.1 7.5 7.6 8.3 8.7 9.2 9.3 | 8.9
Daily Avg Max 2-Min | 21.1 20.7 22.7 23.9 24.0 23.0 22.2 21.9 20.4 20.2 19.9 20.6 | 21.7
Daily Avg Peak Gust | 24.6 24.2 27.3 28.6 29.0 28.4 27.5 27.1 24.9 24.2 23.6 24.1 | 26.1
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Maximum Daily Avg | 22.7 18.3 23.1 23.5 22.8 20.1 15.5 15.6 20.2 26.2 24.2 20.6 | 26.2
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Maximum 2-Minute Avg| 43 46 47 55 43 49 54 40 49 48 40 46 | 55
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Date of Max 2min-Day| 28 07 25 04 26 16 02 02 29 02 19 15 |
-Year| 2008 1999 2007 2000 1998 2005 2000 1999 2002 1998 2003 2000 |
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Maximum Peak Gust | 53 56 59 70 58 67 71 66 70 55 52 55 | 71
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Date of Max Gust-Day| 28 07 25 04 12 21 02 09 29 20 19 15 |
-Year| 2008 2008 2007 2000 2001 2008 2000 2007 2002 2008 2003 2000 |
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Avg Number of Days: | |
Peak Gust >=30 | 8.3 7.7 12.0 13.3 15.1 11.6 11.5 11.4 8.6 8.6 7.2 7.9 | 123.3
Peak Gust >=40 | 1.4 1.5 2.9 3.3 3.2 3.0 3.8 3.8 1.8 1.5 1.7 1.8 | 29.7
Peak Gust >=50 | 0.1 0.5 0.2 0.6 0.2 0.7 1.3 0.6 0.3 0.4 0.1 0.2 | 5.0
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Max 2-Minute >=30| 3.2 3.5 5.8 6.1 6.8 5.1 5.7 5.6 3.4 2.8 3.0 0.0 | 51.1
Max 2-Minute >=40| 0.2 0.5 0.6 0.9 0.2 0.6 0.9 0.3 0.4 0.3 0.2 0.0 | 5.0
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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.