Summers are warm with cool nights. Winters are cold and extremely snowy with heavy snowfall for most of the year, and are the second snowiest in the state of Montana after Cooke City.
According to the Köppen Climate Classification system, Mystic Lake has a subarctic climate, abbreviated "Dfc" on climate maps.
More information Climate data for Mystic Lake, Montana, 1991–2020 normals, extremes 1924–present, Month ...
| Climate data for Mystic Lake, Montana, 1991–2020 normals, extremes 1924–present |
| Month |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Year |
| Record high °F (°C) |
60
(16) |
62
(17) |
65
(18) |
80
(27) |
83
(28) |
91
(33) |
94
(34) |
92
(33) |
88
(31) |
80
(27) |
68
(20) |
62
(17) |
94
(34) |
| Mean maximum °F (°C) |
50.7
(10.4) |
50.1
(10.1) |
56.9
(13.8) |
65.3
(18.5) |
73.4
(23.0) |
80.6
(27.0) |
85.1
(29.5) |
84.0
(28.9) |
80.5
(26.9) |
70.0
(21.1) |
56.9
(13.8) |
48.8
(9.3) |
86.3
(30.2) |
| Mean daily maximum °F (°C) |
34.5
(1.4) |
34.3
(1.3) |
41.4
(5.2) |
48.0
(8.9) |
56.5
(13.6) |
66.0
(18.9) |
74.7
(23.7) |
74.1
(23.4) |
65.5
(18.6) |
52.0
(11.1) |
39.9
(4.4) |
32.8
(0.4) |
51.6
(10.9) |
| Daily mean °F (°C) |
26.5
(−3.1) |
25.6
(−3.6) |
31.8
(−0.1) |
37.4
(3.0) |
45.7
(7.6) |
54.3
(12.4) |
62.3
(16.8) |
61.9
(16.6) |
53.6
(12.0) |
42.1
(5.6) |
32.0
(0.0) |
25.3
(−3.7) |
41.5
(5.3) |
| Mean daily minimum °F (°C) |
18.5
(−7.5) |
16.9
(−8.4) |
22.2
(−5.4) |
26.9
(−2.8) |
34.9
(1.6) |
42.7
(5.9) |
50.0
(10.0) |
49.6
(9.8) |
41.7
(5.4) |
32.3
(0.2) |
24.0
(−4.4) |
17.7
(−7.9) |
31.5
(−0.3) |
| Mean minimum °F (°C) |
−6.6
(−21.4) |
−5.2
(−20.7) |
−0.2
(−17.9) |
11.0
(−11.7) |
20.5
(−6.4) |
31.3
(−0.4) |
41.0
(5.0) |
38.3
(3.5) |
25.6
(−3.6) |
11.5
(−11.4) |
1.4
(−17.0) |
−6.8
(−21.6) |
−16.9
(−27.2) |
| Record low °F (°C) |
−35
(−37) |
−38
(−39) |
−23
(−31) |
−13
(−25) |
1
(−17) |
21
(−6) |
29
(−2) |
29
(−2) |
5
(−15) |
−8
(−22) |
−24
(−31) |
−35
(−37) |
−38
(−39) |
| Average precipitation inches (mm) |
1.12
(28) |
1.49
(38) |
2.00
(51) |
2.73
(69) |
4.10
(104) |
3.01
(76) |
2.30
(58) |
1.86
(47) |
2.03
(52) |
2.55
(65) |
1.92
(49) |
1.40
(36) |
26.51
(673) |
| Average snowfall inches (cm) |
17.4
(44) |
25.3
(64) |
31.6
(80) |
34.0
(86) |
14.6
(37) |
1.7
(4.3) |
0.0
(0.0) |
0.0
(0.0) |
3.8
(9.7) |
20.1
(51) |
22.6
(57) |
21.6
(55) |
192.7
(488) |
| Average precipitation days (≥ 0.01 in) |
7.9 |
9.2 |
11.2 |
12.4 |
14.1 |
14.4 |
12.1 |
11.7 |
9.2 |
10.3 |
9.1 |
9.6 |
131.2 |
| Average snowy days (≥ 0.1 in) |
7.6 |
8.4 |
9.1 |
8.8 |
3.5 |
0.4 |
0.0 |
0.0 |
1.1 |
5.2 |
7.3 |
8.5 |
59.9 |
| Source 1: NOAA[4] |
| Source 2: National Weather Service[5] |
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