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054
NOUS45 KTFX 011607
PNSTFX
MTZ008>015-044>055-151800-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
1005 AM MDT THU AUG 1 2019
...July 2019 and October-July Water Year Weather Summary for north
central and southwest Montana...
July 2019 temperatures averaged slightly below normal. Precipitation
was variable but near normal. There were several days of severe
weather. In the area, there were 10 days on which severe weather was
reported, which was the most in any month since July 2013. The first
half of the month generally had temperatures averaging below normal.
Many areas had their first 90F day on July 13, during a period with
slightly above normal temperatures. Thunderstorms in the Havre are
caused winds to 92 mph at Saddle Butte on the 14th. Hail to 1.25-
inches was reported at Townsend. Cooling occurred by the 16th, with
highs in the 70s through the 21st. It was quite windy on the 18th,
with peak gusts of 56 mph at Cut Bank and 52 mph at Great Falls.
Daily wind averages were 20-22 mph in the area, which were record
highs for the date. The area's lowest temperatures occurred on the
20th and 21st, on which several record low temperatures were set.
Elk Park and Gates Park dropped to 25F on the 20th. Great Falls fell
to 38F on the 21st, which was their coolest July temperature since
1999. Temperatures warmed rapidly with the area's warmest
temperature on the 23rd, when Loma reached 101F. Thunderstorms along
a cold front produced gusts to 63 mph at Havre. Gusty winds on the
24th produced winds to 72 mph at Deep Creek. Great Falls had a gust
of 60 mph.. Warm conditions continued through the end of the month.
#### Temperature ####
Temperatures averaged up to 1.5 degrees below normal in July. The
warmest average was 71.0F at Armells Creek (Fergus). Lewistown
reported the greatest negative departure from normal at 1.4F below
normal. The warmest temperature of 101F was reported at Loma on the
23rd. The coolest temperature was 25F at Elk Park and Gates Park on
the 20th.
The area average temperature for July was 65.0F, or 1.0F below. This
was the 33rd coolest July of record and coolest since 2010. For the
water-year the average temperature has been 35.9F (2.9F below
normal) and the coolest since 2010. The calendar year through July
has averaged 37.6F (4.5F below normal) and the 3rd coolest of
record. This ranks as the coolest since 1975. The crop-year (Apr-
Jul) average temperature is 53.3F (0.9F below normal) is the 27th
coolest of record and coolest since 2011.
Most locations had their coolest July since 2010.
#### Precipitation ####
For precipitation, rainfall amounts were near average most areas.
The driest area was along the hi-line. The highest reported amount
was 3.80-inches at Spur Park, while Boulder reported 3.08-inches.
Some areas over the hi-line recorded less than a quarter of an inch
for the month. Dillon has had their driest water-year since 2014.
The area's average monthly precipitation was 1.33-inches, the 59th
wettest of record. For the water-year, the average has been 12.77-
inches, the 57th wettest of record. For the calendar year, an
average of 10.60-inches has fallen, which is the 50th wettest of
record and wettest since 2011. For the crop year (Apr-Jul), an
average of 7.18-inches has fallen, which is 0.36-inches below
normal.
#### Wind ###
On average, this was the 11th calmest July of record. All areas
had wind averages below normal.
The windiest locations were at Deep Creek RAWS (13.2-mph) and Sweet
Grass (11.0-mph). The area's highest gust was 92 mph during a
thunderstorm on the 14th just southeast of Havre. The area average
wind speed was 7.6-mph, 0.3-mph below normal. This was the 11th
calmest of record. For the water-year, the average was 8.3-mph, 0.8-
mph below normal. This is the calmest such period of record,
exceeding the previous calmest water-year-to-date of 8.6-mph set in
2010. The calendar year average wind speed is 8.6-mph, the 2nd
calmest of record. For the crop year (Apr-Jul) the average wind
speed is 8.4 mph (0.9-mph below normal), the 4th calmest of record.
Most sites had their calmest water-year since 2010.
Average Temperature...Degrees Fahrenheit...
JUL NORM RANK OCT-JUL NORM RANK
Bozeman......65.8..67.0... 36.2....39.2... 9th coolest
Bozeman MSU..65.0..67.5... 37.4....41.5...
Cut Bank.....63.3..64.6... 35.4....38.6...
Dillon.......64.6..65.7... 36.3....39.4... 2nd coolest
Great Falls..66.3..67.4... 39.2....41.2... 6th coolest
Havre........68.3..69.2... 36.3....39.6...
Helena.......69.0..70.0 .. 38.9....41.8...
Lewistown....64.1..65.5... 36.3....39.6... 9th coolest
W Yellowston.58.7..58.6... 29.8....30.7...
Area.........65.0..66.0...33rd coolest 35.9....38.8... 6th coolest
Precipitation...Inches...
JUL NORM OCT-JUL NORM
Bozeman.......1.70..1.12... 12.27...11.78...
Bozeman MSU...1.70..1.46... 19.59...16.88...
Cut Bank......0.86..1.28... 9.84....8.47...
Dillon........0.70..1.25... 7.22....8.60...
Great Falls...1.16..1.50... 12.53...11.76...
Havre.........0.47..1.64... 8.16....8.97...
Helena........1.75..1.19... 10.91....8.92...
Lewistown.....2.37..1.93... 13.10...13.77...
W Yellowstone.1.24..1.74... 21.30...19.09...
Area..........1.33..1.33...59th wettest 12.77...12.61...57th wettest
Average Wind Speed...MPH...
JUL NORM RANK OCT-JUL NORM RANK
Bozeman.......6.1....6.2... 5.1.... 5.8... 2nd calmest
Cut Bank.....10.4...10.8... 11.8....13.1... 4th calmest
Dillon........7.4... 7.7... 8.6.... 9.2... 5th calmest
Great Falls.. 9.2... 9.8... 11.0....12.5... 2nd calmest
Havre........ 8.9....9.0... 10.1....10.1...
Helena....... 6.5....7.3... 5.9.... 7.0... 1st calmest
Lewistown.... 6.8... 7.9... 8th calmest 8.6.... 9.5... 8th calmest
W Yellowstone 5.7... 5.5... 5.3.... 6.1
Area......... 7.6... 7.9...11th calmest 8.3.... 9.1... 1st calmest
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, Lewistown began in 1896, and West
Yellowstone began in 1905. 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 and West Yellowstone in 2010. Bozeman MSU
temperature began in 1892 and precipitation in 1868 (Fort Ellis).
The normal period for all elements is 1981 to 2010.
For additional information, refer to the Montana summary available
on-line at:
http://weather.gov/tfx/climate/droughtsum/droughtsum.php?wfo=tfx
These data are preliminary and have not undergone final QC by NCEI.
Therefore these data are subject to revision. Final and certified
climate data can be accessed at the National Centers for
Environmental Data at: http://www.ncei.noaa.gov
$$
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