Boulder Mountains (Montana)

Last updated
Boulder Mountains
Highest point
Peak Haystack Mountain
Elevation 8,819 ft (2,688 m)
Coordinates 46°08′29″N112°19′35″W / 46.14139°N 112.32639°W / 46.14139; -112.32639
Geography
Country United States
State Montana
Parent range Rocky Mountains

The Boulder Mountains are a mountain range running roughly north to south located west of Boulder between Helena and Butte in the U.S. state of Montana. [1] Parts of the range are in four different counties: Deer Lodge, Jefferson, Lewis and Clark, and Silver Bow. [1]

Contents

Haystack Mountain, which reaches 8,819 feet (2,688 m), is the tallest peak in the range. [2] [3] The three other highest peaks are Jack Mountain at 8,752 feet (2,668 m), Bull Mountain at 8,609 feet (2,624 m), and Thunderbolt Mountain at 8,597 feet (2,620 m). [2] All four peaks are in Jefferson County. [2]

Climate

Rocker Peak, 8,455 ft (2,577 m), [4] is near Jack Mountain (Montana), the second highest peak in the Boulder Mountains. [5] There is a SNOTEL weather station near the summit of Rocker Peak at an elevation of 8,000 ft (2,438 m). Rocker Peak has a subalpine climate (Köppen Dfc), bordering on an Alpine climate (Köppen ET).

Climate data for Rocker Peak, Montana, 1991–2020 normals, 1983-2020 extremes: 8000ft (2438m)
MonthJanFebMarAprMayJunJulAugSepOctNovDecYear
Record high °F (°C)55
(13)
53
(12)
58
(14)
66
(19)
73
(23)
81
(27)
85
(29)
85
(29)
81
(27)
72
(22)
59
(15)
48
(9)
85
(29)
Mean maximum °F (°C)43.2
(6.2)
43.4
(6.3)
49.6
(9.8)
56.5
(13.6)
63.8
(17.7)
71.4
(21.9)
77.1
(25.1)
76.2
(24.6)
72.1
(22.3)
62.1
(16.7)
49.0
(9.4)
40.7
(4.8)
78.2
(25.7)
Average high °F (°C)26.8
(−2.9)
27.6
(−2.4)
34.2
(1.2)
39.6
(4.2)
48.0
(8.9)
55.8
(13.2)
66.4
(19.1)
65.4
(18.6)
55.8
(13.2)
42.4
(5.8)
31.6
(−0.2)
25.1
(−3.8)
43.2
(6.2)
Daily mean °F (°C)20.2
(−6.6)
19.8
(−6.8)
25.5
(−3.6)
30.5
(−0.8)
38.8
(3.8)
45.9
(7.7)
54.9
(12.7)
54.1
(12.3)
46.1
(7.8)
34.5
(1.4)
24.9
(−3.9)
18.9
(−7.3)
34.5
(1.4)
Average low °F (°C)13.6
(−10.2)
12.2
(−11.0)
16.8
(−8.4)
21.4
(−5.9)
29.6
(−1.3)
36.0
(2.2)
43.5
(6.4)
42.9
(6.1)
36.3
(2.4)
26.7
(−2.9)
18.2
(−7.7)
12.6
(−10.8)
25.8
(−3.4)
Mean minimum °F (°C)−8.1
(−22.3)
−8.8
(−22.7)
−2.0
(−18.9)
7.0
(−13.9)
16.6
(−8.6)
26.6
(−3.0)
34.0
(1.1)
32.2
(0.1)
22.3
(−5.4)
8.4
(−13.1)
−1.2
(−18.4)
−7.8
(−22.1)
−19.7
(−28.7)
Record low °F (°C)−30
(−34)
−42
(−41)
−24
(−31)
−8
(−22)
7
(−14)
16
(−9)
16
(−9)
16
(−9)
4
(−16)
−11
(−24)
−27
(−33)
−39
(−39)
−42
(−41)
Average precipitation inches (mm)2.07
(53)
2.16
(55)
2.58
(66)
3.50
(89)
3.58
(91)
4.08
(104)
1.72
(44)
1.52
(39)
1.80
(46)
2.16
(55)
2.24
(57)
2.11
(54)
29.52
(753)
Source 1: XMACIS2 [6]
Source 2: NOAA (Precipitation) [7]

See also

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References

  1. 1 2 "Boulder Mountains". Geographic Names Information System. United States Geological Survey. October 27, 2000. Retrieved January 23, 2013.
  2. 1 2 3 "Montana's Tallest Peaks by Mountain Range". Montana State Library. Retrieved January 23, 2013.
  3. "Haystack Mountain". Geographic Names Information System. United States Geological Survey. November 28, 1980. Retrieved January 23, 2013.
  4. "Rocker Peak". Peakery. Retrieved November 23, 2023.
  5. "Montana's Tallest Peaks by Mountain Range". Montana.gov. Retrieved November 23, 2023.
  6. "xmACIS2". National Oceanic and Atmospheric Administration. Retrieved November 23, 2023.
  7. "Rocker Peak, Montana 1991-2020 Monthly Normals" . Retrieved November 23, 2023.