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Public Information Statement
Statement as of 11:17 am MDT on October 1, 2014
... September 2014 and water year 2014 weather summary for north central and southwest Montana...
General westerly flow aloft brought near normal temperatures to Montana in September. Precipitation was above normal from the southwest through Stanford and northeast to Harlem. Over most other areas, precipitation was below normal. Temperature departures ranged from 1.6f above normal at Chinook to 1.9f below normal at Gold Butte. The area's warmest temperature was 98f at Loma on the 25th, with the coolest 7f at Wisdom on the 12th.
Generally, the first half of the month had cooler-than-normal temperature, with above normal readings during the second half. The first frost of the season was recorded at many locations on the 10th and 11th, with the first seasonal snowfall recorded at this time, too. Havre had their earliest frost since 1992. The coolest average temperature was 45.9f at Elk Park, with the warmest 61.3f at Holter dam. The water year average temperature was slightly cooler than normal across the region. The greatest departure, as much as 4f, was over the hi-line from Sunburst to Kremlin. At Great Falls, iw was the 17th coolest water-year, and the coolest since 2010.
For precipitation, September produced near to below normal rainfall. The wettest area was from West Yellowstone, northeast to Blaine County. This area recorded more than two inches of precipitation. The greatest monthly amount was 3.60 inches at Pike Creek snotel, and 2.46 inches at Logan. The water year was wet. At Cut Bank, it was the 13th wettest of record, as they received nearly five inches more than normal. Bozeman had their wettest water year since 1996, and Great Falls saw their wettest water year since 1992.
Winds continued to average below normal across much of the area. Bozeman recorded their fourth calmest September of record. Of lower elevation sites, Sweet Grass was the windiest, with an average speed of 11.8 mph. Of Airport locations, Cut Bank had the strongest monthly average of 10.3 mph, slightly below the long-term average. The strongest area gust was 72 mph at Deep Creek RAWS on the 19th, and 55 mph at Sunburst on the 26th.
For the water-year, Great Falls had their calmest of record. The previously calmest water-year was in 1997. Otherwise, winds were close to the long-term average over the water year.
Temperature and precipitation records for Bozeman began in 1935... Cut Bank began in 1903... Dillon began in 1939... Great Falls began in 1891 ... Havre and Helena began in 1880... and Lewistown began in 1896. Wind records at Bozeman and Dillon began in 1948... Cut Bank and Lewistown in 1938... Great Falls in 1939... Havre in 1889... Helena in 1880... West Yellowstone in 2010. The normal period for all elements is 1981 to 2010.
These data are preliminary and have not undergone final qc by ncdc. Therefore these data are subject to revision. Final and certified climate data can be accessed at the National climatic data center at www.Ncdc.NOAA.Gov
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