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Montana, Northern Rocky Mountain Front

Public Information Statement

Statement as of 4:30 AM MST on December 11, 2017

Expires 1:00 PM EST on December 15, 2017


... Record or near record maximum temperatures for Dec 11...

Location forecast high record high
Chester 54 57
Shelby 55 55


... Record or near record maximum temperatures for Dec 12...

Location forecast high record high
Chester 55 58
Choteau 58 60
Cut Bank 56 59
Havre 57 60


430 am MST Mon Dec 11 2017

... Record or near record maximum temperatures for Dec 11...

Location forecast high record high
Chester 54 57
Shelby 55 55


... Record or near record maximum temperatures for Dec 12...

Location forecast high record high
Chester 55 58
Choteau 58 60
Cut Bank 56 59
Havre 57 60



532 PM MST Sat Dec 1 2017

... November 2017 and autumn seasonal weather summary for north
central and southwest Montana...

After a cold period early in the month, November delivered mostly
near to above normal temperatures. Below zero temperatures were seen
across much of the area early in the month, temperatures averaged 35
to 40 degrees below normal on the 4th and 5th, rebounding to 25 to
30 degrees above normal from the 22nd-26th. Precipitation was mostly
concentrated early in the month, during the coldest period. Heavy
snow blanketed much of north central Montana early in the
month. Windy conditions of the fall also continued through November.

### Temperature

Overall... temperatures averaged above normal over southern portions
and below normal in north central Montana. Temperature departures
from average ranged from 2.5f below normal at Turner to 5.3f above
normal at West Yellowstone. The area's highest temperature was 73f
at Valentine on the 23rd. The lowest temperature was -16 at Rudyard
19s on the 7th. Temperature averages ranged from 37.4f at Holter dam
to 21.0f at porphory peak. As a composite, the area average
temperature was near normal.

For the fall season /September through November/, this was the
coolest such period since 2002 at Bozeman and Dillon. It was the
coolest since 2006 at Cut Bank and Havre.

### Precipitation
precipitation amounts were above normal except over eastern portions
of the area. Bozeman and West Yellowstone had their 5th wettest
November of record. The wettest spot was Black Bear snotel with
12.20", while east Glacier reported 4.96". This was the wettest
November since 1968 at Bozeman, and since 1988 at West Yellowstone.

Persistent precipitation for the fall produced the 4th wettest of
record at West Yellowstone. It was the wettest fall period since
1985 at Helena.

The above normal precipitation most areas also produced above normal
snowfall totals for November at most locations. Cut Bank recorded
their 5th highest amount, and most in November since 2012. With
24.9" at Bozeman msu, this was their 7th highest monthly amount for
November.

### Wind
in general, winds were above normal in November. At Airport
locations, Cut Bank had the strongest monthly average at 15.6 mph.
The highest average at higher elevations was 24.0 mph at Deep Creek
RAWS, in Glacier County. The highest November gust was 95 mph at
Logan Pass on the 23rd. A spot near Fort Benton recorded a gust to
82 mph on the 20th.
This was the windiest November in several years at most locations.
Bozeman and Lewistown saw their windiest November since 2006. At
Havre it was the windiest since 2007 and since 2009 at Great Falls.
Great Falls had 14 days with gusts of 40 mph or higher. The average
is seven. This was the most number of days with gusts of 40 mph or
higher since November 1990.

For the fall period, October and November had stronger than normal
wind speeds. This was the windiest fall since 1990 at Cut Bank and
since 1992 at Great Falls. Lewistown had their windiest fall since
2003.
For October and November, winds gusted over 40 mph on 26 days at
Great Falls. This was the most since 32 days during this period in
1990. The average is 13 days.

Average temperature...
              Nov norm Sep-Nov norm
Bozeman... ... .27.8..29.7..26th coolest 41.8... .42.8..19th coolest
Cut Bank... ... 28.3..30.3..37th coolest 41.5... .42.3..40th coolest
Dillon... ... ..32.9..30.5..27th warmest 42.8... .43.0..18th coolest
Great Falls... 32.9..33.4..60th coolest 44.9... .44.9..34th coolest
Havre... ... ... 28.2..30.2..44th coolest 42.7... .43.7..36th coolest
Helena... ... ..31.6..32.5..59th coolest 44.8... .45.3..
Lewistown... ..32.4..32.0..57th warmest 43.8... .43.5..51st coolest
W Yellowstone.26.2..20.9..21st warmest 36.2... .34.8..41st warmest
NC/SW Mt comp.30.0..29.9..67th coolest 42.3... .42.5..41st coolest

Precipitation...
              Nov norm Sep-Nov norm
Bozeman... ... .1.66..0.77.. 5th wettest 3.78... .2.97..22nd wettest
Cut Bank... ... 0.51..0.36..27th wettest 1.54... .2.02..44th driest
Dillon... ... ..0.52..0.39..21st wettest 2.89... .1.92..15th wettest
Great Falls... 0.97..0.59..39th wettest 3.92... .2.87..27th wettest
Havre... ... ... 0.38..0.43..65th driest 3.27... .2.13..27th wettest
Helena... ... ..1.06..0.49..22nd wettest 3.42... .2.27..26th wettest
Lewistown... ..0.40..0.71..35th driest 4.00... .3.19..34th wettest
W Yellowstone.4.20..2.07.. 5th wettest 9.40... .4.67.. 4th wettest
NC/SW Mt comp.1.28..0.84..17th wettest 4.22... .3.93..19th wettest

Snowfall... inches...
              Nov norm Sep-Nov norm
Bozeman msu... 24.9..11.3.. 7th highest 28.9... .18.0..15th highest
Cut Bank... ... 14.3.. 5.0.. 5th highest 16.8... . 7.8..11th highest
Dillon... ... .. 6.3.. 4.9..40th highest 6.3... .10.1..31st lowest
Great Falls... 13.4.. 8.1..25th highest 15.4... .13.4..34th lowest
Havre... ... ... 4.5.. 5.3..65th highest 18.0... . 7.6.. 8th highest
Helena... ... .. 7.5.. 4.7..40th highest 8.8... . 8.5..64th lowest
Lewistown... .. 7.8.. 4.9..45th highest 15.3... . 8.2..34th highest
W Yellowstone.22.9..25.0..40th highest 28.6... .31.4..28th lowest
NC/SW Mt comp.12.7.. 9.2..23rd highest 17.3... .13.6..29th highest

Average wind speed...
              Nov norm Sep-Nov norm
Bozeman... ... .5.0... .5.2..18th calmest 5.7... ..5.3..23rd windiest
Cut Bank... ..15.6... 14.1..15th windiest 14.4... .12.7..10th windiest
Dillon... ... . 8.7... .9.2..19th calmest 8.8... ..8.7..30th windiest
Great Falls..15.0... 14.2..31st windiest 13.4... .12.4..23rd windiest
Havre... ... ..10.3... 9.3..30th windiest 10.3... ..8.9..12th windiest
Helena... ... ..5.7... .6.4..23rd calmest 6.2... ..6.2..23rd calmest
Lewistown... .11.4... 10.1..17th windiest 10.0... ..9.2..18th windiest
W yellowston. 5.9... 5.4 5.7... ..5.8
NC/SW Mt cmp. 9.7... .9.4..52nd windiest 9.3... ..8.7..48th windiest

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 began at Bozeman and
Dillon in 1948... Cut Bank and Lewistown in 1938... Great Falls in
1939... Havre in 1889... Helena in 1880... and 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 centers for
environmental information.


532 PM MST Sat Dec 1 2017

... November 2017 and autumn seasonal weather summary for north
central and southwest Montana...

After a cold period early in the month, November delivered mostly
near to above normal temperatures. Below zero temperatures were seen
across much of the area early in the month, temperatures averaged 35
to 40 degrees below normal on the 4th and 5th, rebounding to 25 to
30 degrees above normal from the 22nd-26th. Precipitation was mostly
concentrated early in the month, during the coldest period. Heavy
snow blanketed much of north central Montana early in the
month. Windy conditions of the fall also continued through November.

### Temperature

Overall... temperatures averaged above normal over southern portions
and below normal in north central Montana. Temperature departures
from average ranged from 2.5f below normal at Turner to 5.3f above
normal at West Yellowstone. The area's highest temperature was 73f
at Valentine on the 23rd. The lowest temperature was -16 at Rudyard
19s on the 7th. Temperature averages ranged from 37.4f at Holter dam
to 21.0f at porphory peak. As a composite, the area average
temperature was near normal.

For the fall season /September through November/, this was the
coolest such period since 2002 at Bozeman and Dillon. It was the
coolest since 2006 at Cut Bank and Havre.

### Precipitation
precipitation amounts were above normal except over eastern portions
of the area. Bozeman and West Yellowstone had their 5th wettest
November of record. The wettest spot was Black Bear snotel with
12.20", while east Glacier reported 4.96". This was the wettest
November since 1968 at Bozeman, and since 1988 at West Yellowstone.

Persistent precipitation for the fall produced the 4th wettest of
record at West Yellowstone. It was the wettest fall period since
1985 at Helena.

The above normal precipitation most areas also produced above normal
snowfall totals for November at most locations. Cut Bank recorded
their 5th highest amount, and most in November since 2012. With
24.9" at Bozeman msu, this was their 7th highest monthly amount for
November.

### Wind
in general, winds were above normal in November. At Airport
locations, Cut Bank had the strongest monthly average at 15.6 mph.
The highest average at higher elevations was 24.0 mph at Deep Creek
RAWS, in Glacier County. The highest November gust was 95 mph at
Logan Pass on the 23rd. A spot near Fort Benton recorded a gust to
82 mph on the 20th.
This was the windiest November in several years at most locations.
Bozeman and Lewistown saw their windiest November since 2006. At
Havre it was the windiest since 2007 and since 2009 at Great Falls.
Great Falls had 14 days with gusts of 40 mph or higher. The average
is seven. This was the most number of days with gusts of 40 mph or
higher since November 1990.

For the fall period, October and November had stronger than normal
wind speeds. This was the windiest fall since 1990 at Cut Bank and
since 1992 at Great Falls. Lewistown had their windiest fall since
2003.
For October and November, winds gusted over 40 mph on 26 days at
Great Falls. This was the most since 32 days during this period in
1990. The average is 13 days.

Average temperature...
              Nov norm Sep-Nov norm
Bozeman... ... .27.8..29.7..26th coolest 41.8... .42.8..19th coolest
Cut Bank... ... 28.3..30.3..37th coolest 41.5... .42.3..40th coolest
Dillon... ... ..32.9..30.5..27th warmest 42.8... .43.0..18th coolest
Great Falls... 32.9..33.4..60th coolest 44.9... .44.9..34th coolest
Havre... ... ... 28.2..30.2..44th coolest 42.7... .43.7..36th coolest
Helena... ... ..31.6..32.5..59th coolest 44.8... .45.3..
Lewistown... ..32.4..32.0..57th warmest 43.8... .43.5..51st coolest
W Yellowstone.26.2..20.9..21st warmest 36.2... .34.8..41st warmest
NC/SW Mt comp.30.0..29.9..67th coolest 42.3... .42.5..41st coolest

Precipitation...
              Nov norm Sep-Nov norm
Bozeman... ... .1.66..0.77.. 5th wettest 3.78... .2.97..22nd wettest
Cut Bank... ... 0.51..0.36..27th wettest 1.54... .2.02..44th driest
Dillon... ... ..0.52..0.39..21st wettest 2.89... .1.92..15th wettest
Great Falls... 0.97..0.59..39th wettest 3.92... .2.87..27th wettest
Havre... ... ... 0.38..0.43..65th driest 3.27... .2.13..27th wettest
Helena... ... ..1.06..0.49..22nd wettest 3.42... .2.27..26th wettest
Lewistown... ..0.40..0.71..35th driest 4.00... .3.19..34th wettest
W Yellowstone.4.20..2.07.. 5th wettest 9.40... .4.67.. 4th wettest
NC/SW Mt comp.1.28..0.84..17th wettest 4.22... .3.93..19th wettest

Snowfall... inches...
              Nov norm Sep-Nov norm
Bozeman msu... 24.9..11.3.. 7th highest 28.9... .18.0..15th highest
Cut Bank... ... 14.3.. 5.0.. 5th highest 16.8... . 7.8..11th highest
Dillon... ... .. 6.3.. 4.9..40th highest 6.3... .10.1..31st lowest
Great Falls... 13.4.. 8.1..25th highest 15.4... .13.4..34th lowest
Havre... ... ... 4.5.. 5.3..65th highest 18.0... . 7.6.. 8th highest
Helena... ... .. 7.5.. 4.7..40th highest 8.8... . 8.5..64th lowest
Lewistown... .. 7.8.. 4.9..45th highest 15.3... . 8.2..34th highest
W Yellowstone.22.9..25.0..40th highest 28.6... .31.4..28th lowest
NC/SW Mt comp.12.7.. 9.2..23rd highest 17.3... .13.6..29th highest

Average wind speed...
              Nov norm Sep-Nov norm
Bozeman... ... .5.0... .5.2..18th calmest 5.7... ..5.3..23rd windiest
Cut Bank... ..15.6... 14.1..15th windiest 14.4... .12.7..10th windiest
Dillon... ... . 8.7... .9.2..19th calmest 8.8... ..8.7..30th windiest
Great Falls..15.0... 14.2..31st windiest 13.4... .12.4..23rd windiest
Havre... ... ..10.3... 9.3..30th windiest 10.3... ..8.9..12th windiest
Helena... ... ..5.7... .6.4..23rd calmest 6.2... ..6.2..23rd calmest
Lewistown... .11.4... 10.1..17th windiest 10.0... ..9.2..18th windiest
W yellowston. 5.9... 5.4 5.7... ..5.8
NC/SW Mt cmp. 9.7... .9.4..52nd windiest 9.3... ..8.7..48th windiest

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 began at Bozeman and
Dillon in 1948... Cut Bank and Lewistown in 1938... Great Falls in
1939... Havre in 1889... Helena in 1880... and 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 centers for
environmental information.


Nnnn

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