| Climate data for Cheyenne Regional Airport, Wyoming (1991–2020 normals,[a] extremes 1872−present[b]) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
| Record high °F (°C) | 70 (21) |
71 (22) |
77 (25) |
84 (29) |
91 (33) |
100 (38) |
100 (38) |
98 (37) |
97 (36) |
85 (29) |
75 (24) |
70 (21) |
100 (38) |
| Mean maximum °F (°C) | 58.4 (14.7) |
60.0 (15.6) |
68.6 (20.3) |
74.8 (23.8) |
82.7 (28.2) |
90.8 (32.7) |
94.4 (34.7) |
92.5 (33.6) |
88.1 (31.2) |
78.5 (25.8) |
67.2 (19.6) |
58.8 (14.9) |
95.2 (35.1) |
| Mean daily maximum °F (°C) | 40.0 (4.4) |
40.6 (4.8) |
49.1 (9.5) |
54.8 (12.7) |
64.4 (18.0) |
76.7 (24.8) |
84.1 (28.9) |
82.0 (27.8) |
73.3 (22.9) |
59.1 (15.1) |
47.5 (8.6) |
39.3 (4.1) |
59.2 (15.1) |
| Daily mean °F (°C) | 29.2 (−1.6) |
29.5 (−1.4) |
37.1 (2.8) |
42.8 (6.0) |
52.3 (11.3) |
63.1 (17.3) |
70.1 (21.2) |
68.1 (20.1) |
59.6 (15.3) |
46.5 (8.1) |
36.1 (2.3) |
28.7 (−1.8) |
46.9 (8.3) |
| Mean daily minimum °F (°C) | 18.4 (−7.6) |
18.4 (−7.6) |
25.1 (−3.8) |
30.8 (−0.7) |
40.2 (4.6) |
49.4 (9.7) |
56.1 (13.4) |
54.3 (12.4) |
45.8 (7.7) |
33.9 (1.1) |
24.7 (−4.1) |
18.1 (−7.7) |
34.6 (1.4) |
| Mean minimum °F (°C) | −5.8 (−21.0) |
−3.8 (−19.9) |
6.6 (−14.1) |
16.2 (−8.8) |
26.6 (−3.0) |
38.5 (3.6) |
47.1 (8.4) |
44.8 (7.1) |
31.9 (−0.1) |
16.4 (−8.7) |
3.2 (−16.0) |
−4.7 (−20.4) |
−13.0 (−25.0) |
| Record low °F (°C) | −38 (−39) |
−34 (−37) |
−21 (−29) |
−8 (−22) |
8 (−13) |
25 (−4) |
33 (1) |
25 (−4) |
8 (−13) |
−5 (−21) |
−21 (−29) |
−28 (−33) |
−38 (−39) |
| Average precipitation inches (mm) | 0.35 (8.9) |
0.52 (13) |
0.96 (24) |
1.79 (45) |
2.44 (62) |
2.16 (55) |
2.11 (54) |
1.52 (39) |
1.47 (37) |
1.00 (25) |
0.61 (15) |
0.48 (12) |
15.41 (391) |
| Average snowfall inches (cm) | 6.3 (16) |
9.0 (23) |
9.7 (25) |
11.3 (29) |
3.4 (8.6) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
1.0 (2.5) |
5.9 (15) |
7.5 (19) |
8.8 (22) |
62.9 (160) |
| Average extreme snow depth inches (cm) | 3.8 (9.7) |
3.9 (9.9) |
3.8 (9.7) |
3.4 (8.6) |
1.7 (4.3) |
0.0 (0.0) |
0.0 (0.0) |
0.0 (0.0) |
0.5 (1.3) |
2.8 (7.1) |
4.0 (10) |
4.4 (11) |
8.5 (22) |
| Average precipitation days (≥ 0.01 in) | 5.1 | 6.9 | 7.9 | 10.6 | 12.9 | 10.7 | 10.5 | 10.3 | 7.3 | 7.1 | 6.2 | 6.0 | 101.5 |
| Average snowy days (≥ 0.1 in) | 5.9 | 7.3 | 6.8 | 6.8 | 1.9 | 0.1 | 0.0 | 0.0 | 0.5 | 3.2 | 5.8 | 6.7 | 45.0 |
| Average relative humidity (%) | 52.5 | 54.6 | 56.1 | 54.3 | 55.8 | 53.5 | 51.3 | 51.4 | 51.5 | 50.0 | 53.6 | 54.0 | 53.2 |
| Average dew point °F (°C) | 9.9 (−12.3) |
12.7 (−10.7) |
17.1 (−8.3) |
24.1 (−4.4) |
33.3 (0.7) |
41.4 (5.2) |
46.2 (7.9) |
44.4 (6.9) |
35.8 (2.1) |
25.5 (−3.6) |
17.4 (−8.1) |
11.1 (−11.6) |
26.6 (−3.0) |
| Mean monthly sunshine hours | 190.7 | 202.6 | 253.1 | 271.9 | 291.9 | 303.2 | 317.5 | 297.4 | 262.3 | 237.0 | 178.8 | 175.4 | 2,981.8 |
| Percent possible sunshine | 64 | 68 | 68 | 68 | 65 | 67 | 69 | 70 | 70 | 69 | 60 | 61 | 67 |
| Average ultraviolet index | 1.7 | 2.7 | 4.5 | 6.4 | 8.2 | 9.7 | 10.2 | 8.8 | 6.5 | 3.9 | 2.2 | 1.4 | 5.5 |
| Source 1: NOAA (relative humidity, dew points and sun 1961−1990)[2][3][4] | |||||||||||||
| Source 2: UV Index Today (1995 to 2022)[5] | |||||||||||||
- ^ Mean monthly maxima and minima (i.e. the expected highest and lowest temperature readings at any point during the year or given month) calculated based on data at said location from 1991 to 2020.
- ^ Official records for Cheyenne kept at the City Office from January 1871 to August 1935 and at Cheyenne Regional since September 1935.[1]
- ^ ThreadEx
- ^ "NOWData – NOAA Online Weather Data". National Oceanic and Atmospheric Administration. Retrieved December 10, 2021.
- ^ "Station: Cheyenne, WY". U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991–2020). National Oceanic and Atmospheric Administration. Archived from the original on 2023-07-05. Retrieved December 10, 2021.
- ^ "WMO Climate Normals for Cheyenne WSFO, WY 1961–1990". National Oceanic and Atmospheric Administration. Archived from the original on 2023-07-05. Retrieved December 10, 2021.
- ^ "Historical UV Index Data - Cheyenne, WY". UV Index Today. Retrieved April 23, 2023.