STATION: MISSOULA INTERNATIONAL AIRPORT (KMSO), 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 | 32.5 37.9 48.3 56.6 66.3 73.2 87.2 84.8 72.3 56.9 41.1 31.8 | 57.4
Avg Min Temp | 18.6 21.8 27.5 31.7 39.5 46.4 52.3 50.0 42.0 32.5 25.1 19.0 | 33.9
Avg Temperature | 25.5 29.9 37.9 44.2 52.9 59.8 69.7 67.4 57.2 44.7 33.1 25.4 | 45.6
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Extremes: | |
Extreme Max Temp| 51 60 78 80 91 98 107 100 96 92 73 53 | 107
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Date of Ext-Day | 01 28 30 22 19 28 06 11 02 28 12 11 |
-Year| 1998 2006 2004 1998 2002 2007 2007 1996 1998 2003 1999 2004 |
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Extreme Min Temp| -23 -8 -3 17 21 30 36 37 20 1 0 -24 | -24
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Date of Ext-Day | 06 17 08 02 08 10 04 31 23 31 06 21 |
-Year| 2004 2006 2002 1999 1999 1999 2000 1999 2000 2002 2003 1998 |
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Heating Degree Days | 1223 993 840 625 381 186 27 40 250 631 957 1228 | 7380
Cooling Degree Days | 0 0 0 0 5 30 174 114 15 0 0 0 | 338
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Avg Number of Days: | |
Max Temp >= 90 | 0.0 0.0 0.0 0.0 0.2 1.8 13.0 10.3 1.2 0.1 0.0 0.0 | 26.6
Max Temp >= 75 | 0.0 0.0 0.1 1.2 7.7 13.7 28.6 27.3 13.4 1.4 0.0 0.0 | 93.3
Max Temp <= 32 | 13.7 5.3 1.3 0.0 0.0 0.0 0.0 0.0 0.0 0.5 6.2 15.6 | 42.6
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Min Temp <= 32 | 29.7 27.1 25.2 16.1 5.7 0.3 0.0 0.0 1.9 14.8 25.3 29.5 | 175.5
Min Temp <= 20 | 15.1 10.4 3.2 1.1 0.0 0.0 0.0 0.0 0.1 1.3 8.1 15.4 | 54.7
Min Temp <= 0 | 2.2 0.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.2 2.0 | 5.1
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Avg Dew Point Temp | 20.3 22.3 26.0 29.7 36.9 43.6 45.1 43.1 39.6 32.4 26.3 20.3 | 32.1
Avg Wet Bulb Temp | 23.9 26.9 32.7 37.8 45.1 51.1 56.1 54.1 47.8 38.6 30.5 23.8 | 39.0
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Avg Sea Level Pres | 30.18 30.16 30.08 30.04 30.00 29.97 29.97 29.98 30.02 30.12 30.17 30.22 | 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 | 0.4 0.8 0.4 0.8 2.4 4.5 4.3 4.5 2.0 0.2 0.6 0.4 | 21.3
Heavy Fog | 8.5 4.6 2.2 0.8 0.6 0.3 0.1 0.2 0.8 2.5 5.1 6.8 | 32.6
Fog | 22.0 15.8 11.0 7.4 7.2 7.0 2.2 2.2 5.6 9.0 17.4 18.8 | 125.6
Hail | 0.0 0.0 0.1 0.1 0.3 0.2 0.2 0.3 0.2 0.0 0.0 0.0 | 1.3
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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 | 0.88 0.75 0.86 1.23 1.91 2.22 0.77 0.84 1.14 1.01 1.12 1.11 | 13.83
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Maximum Daily | 0.45 0.38 0.44 1.75 0.99 1.49 1.00 0.85 1.01 0.90 0.80 0.82 | 1.75
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Date of Ext-Day | 31 23 11 06 26 03 05 26 23 01 12 29 |
-Year| 2003 1999 1997 2006 1998 2001 1998 2004 2007 2000 2008 1996 |
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Avg Number of Days: | |
>= 0.01 | 12.8 9.8 11.2 11.8 11.8 12.0 5.3 6.6 8.4 8.2 10.6 13.5 | 122.0
>= 0.10 | 3.4 2.3 3.2 3.6 5.8 6.3 2.5 2.2 3.2 3.0 3.4 3.5 | 42.3
>= 0.25 | 0.6 0.8 0.7 1.3 3.0 2.8 0.9 1.1 1.4 1.2 1.4 1.2 | 16.3
>= 0.50 | 0.0 0.0 0.0 0.2 0.9 1.2 0.3 0.5 0.5 0.4 0.5 0.2 | 4.7
>= 1.00 | 0.0 0.0 0.0 0.1 0.0 0.1 0.1 0.0 0.1 0.0 0.0 0.0 | 0.3
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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| 3.4 3.8 5.3 6.0 5.9 5.9 5.5 5.0 4.3 4.0 3.5 3.9 | 4.7
Daily Avg Max 2-Min | 12.8 13.3 18.1 19.6 19.7 19.4 19.7 18.9 16.7 15.0 13.1 13.3 | 16.6
Daily Avg Peak Gust | 15.1 15.7 21.9 23.9 24.1 23.9 24.7 23.6 20.3 18.1 15.6 15.7 | 20.2
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Maximum Daily Avg | 20.5 20.3 17.5 17.6 14.3 15.8 14.1 12.7 16.5 15.4 16.7 19.7 | 20.5
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Maximum 2-Minute Avg| 47 41 43 41 38 43 52 46 48 37 33 44 | 52
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Date of Max 2min-Day| 30 16 29 04 25 04 10 05 16 28 18 15 |
-Year| 2004 2007 1999 2000 2003 2007 1998 2003 2000 2003 2003 2006 |
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Maximum Peak Gust | 60 49 52 49 49 55 61 58 55 52 43 53 | 61
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Date of Max Gust-Day| 30 16 13 04 22 04 10 05 01 28 07 15 |
-Year| 2004 2007 2001 2000 2006 2007 1998 2007 2004 2003 1996 2006 |
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Avg Number of Days: | |
Peak Gust >=30 | 2.7 1.7 6.2 5.9 6.3 6.4 7.2 7.2 4.3 2.8 2.5 2.7 | 55.7
Peak Gust >=40 | 0.4 0.3 1.3 1.0 1.3 1.1 1.3 1.3 0.6 0.4 0.5 0.5 | 10.1
Peak Gust >=50 | 0.1 0.0 0.2 0.0 0.0 0.2 0.3 0.2 0.2 0.1 0.0 0.1 | 1.3
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Max 2-Minute >=30| 0.8 0.6 2.2 1.9 1.9 1.6 2.1 1.8 1.2 0.8 1.2 0.0 | 16.0
Max 2-Minute >=40| 0.2 0.1 0.2 0.1 0.0 0.1 0.4 0.2 0.2 0.0 0.0 0.0 | 1.4
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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.