| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 35.5 | 15.5 | 72 | -40 | 0.5 | 9.0 |
| February | 38.0 | 15.9 | 68 | -41 | 0.6 | 10.9 |
| March | 49.2 | 23.3 | 77 | -25 | 0.8 | 10.3 |
| April | 56.5 | 28.7 | 84 | -8 | 1.4 | 10.5 |
| May | 67.0 | 37.5 | 99 | 16 | 2.2 | 2.6 |
| June | 79.8 | 45.7 | 102 | 24 | 1.3 | 0.1 |
| July | 89.2 | 53.4 | 107 | 26 | 1.2 | 0.0 |
| August | 86.9 | 51.8 | 109 | 29 | 0.8 | 0.0 |
| September | 75.8 | 42.6 | 103 | 14 | 1.0 | 1.5 |
| October | 59.9 | 31.4 | 87 | -9 | 1.2 | 7.0 |
| November | 46.0 | 22.5 | 80 | -27 | 0.6 | 8.9 |
| December | 35.1 | 15.2 | 67 | -42 | 0.6 | 11.0 |
| Entire year | 60.0 | 32.0 | 109 | -42 | 12.2 | 71.3 |
|
More Casper Weather Records
1900–2023
|
||
|---|---|---|
| Highest daily low | 77 °F | July 28, 1935 |
| Lowest daily high | -25 °F | February 3, 1989 |
| Greatest daily range (Difference of high and low) |
66 °F | July 13, 1935 |
| Difference in high temperature over two conscutive days |
60 °F | Dec 16–17, 1924 |
| Most daily precipitation | 2.6 inches | September 28, 1923 |
| Most monthly precipitation | 6.5 inches | May 1978 |
| Most yearly precipitation | 21.3 inches | 1923 |
| Earliest freeze | July 3 | 1915 |
| Latest freeze | June 27 | 1915 |
| Earliest snow in season | September 6 | 1929 |
| Latest snow in season | June 13 | 1969 |
| Most daily snow | 24.3 inches | December 24, 1982 |
| Most monthly snow | 62.8 inches | December 1982 |
| Most yearly snow | 137.6 inches | 1982 |
| Greatest snow accumulation | 21.0 inches | December 24, 1982 |
| Most days in a year ≥ 80 °F | 126 | 1911 |
| Most days in a year ≥ 90 °F | 83 | 1912 |
| Most days in a year ≥ 100 °F | 46 | 1912 |
|
Casper Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 12 days | May 16–27, 1995 |
| Without precipitation | 55 days | Sep 30 – Nov 23, 1965 |
| With snow | 8 days | Feb 20–27, 1962 |
| Freezing temperatures High temperature ≤ 32 °F
|
26 days | Jan 15 – Feb 9, 1949 |
| High temperature ≥ 80 °F | 108 days | May 16 – Aug 31, 1912 |
| High temperature ≥ 90 °F | 52 days | Jul 8 – Aug 28, 1912 |
| High temperature ≥ 100 °F | 12 days | Jul 31 – Aug 11, 1912 |