| Boulder Mountains | |
|---|---|
| Highest point | |
| Peak | Haystack Mountain |
| Elevation | 8,819 ft (2,688 m) |
| Coordinates | 46°08′29″N 112°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. Parts of the range are in four different counties: Deer Lodge, Jefferson, Lewis and Clark, and Silver Bow.
Haystack Mountain, which reaches 8,819 feet (2,688 m), is the tallest peak in the range. 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). All four peaks are in Jefferson County.
Climate
Rocker Peak, 8,455 ft (2,577 m), is near Jack Mountain (Montana), the second highest peak in the Boulder Mountains. 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) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| 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) |
| Mean daily maximum °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) |
| Mean daily minimum °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 | |||||||||||||
| Source 2: NOAA (Precipitation) | |||||||||||||
See also
References
- ^ "Boulder Mountains". Geographic Names Information System. United States Geological Survey. October 27, 2000. Retrieved January 23, 2013.
- ^ "Montana's Tallest Peaks by Mountain Range". Montana State Library. Retrieved January 23, 2013.
- "Haystack Mountain". Geographic Names Information System. United States Geological Survey. November 28, 1980. Retrieved January 23, 2013.
- "Rocker Peak". Peakery. Retrieved November 23, 2023.
- "Montana's Tallest Peaks by Mountain Range". Montana.gov. Retrieved November 23, 2023.
- "xmACIS2". National Oceanic and Atmospheric Administration. Retrieved November 23, 2023.
- "Rocker Peak, Montana 1991-2020 Monthly Normals". Retrieved November 23, 2023.
