|
Typical Helena May Weather 1991–2020 |
||
|---|---|---|
| Average daily high | 66.4 °F | |
| Average daily low | 41.1 °F | |
| Average monthly precipitation | 1.9 inches | |
| Average monthly snow | 0.1 inches | |
| Daily chance of precipitation | 36.0% | |
| Daily chance of snow | 0.77% | |
|
Helena May Weather Records 1893–2024 |
||
|---|---|---|
| Highest temperature | 95 °F | May 28, 1919 |
| Lowest temperature | 17 °F | May 2, 1954 |
| Highest daily low | 65 °F | May 31, 1936 |
| Lowest daily high | 31 °F | May 1, 1899 |
| Hottest average high temperature | 75.2 °F | 1958 |
| Coldest average high temperature | 53.6 °F | 1927 |
| Most daily precipitation | 2.1 inches | May 3, 1964 |
| Most monthly precipitation | 6.7 inches | 1927 |
| Most daily snow | 12.5 inches | May 10, 1967 |
| Most monthly snow | 13.9 inches | 1927 |
| Day | Average (°F) | Record (°F) | ||
|---|---|---|---|---|
| High | Low | High | Low | |
| May 1 | 62.0 | 36.4 | 84 | 20 |
| May 2 | 62.3 | 36.8 | 86 | 17 |
| May 3 | 62.8 | 37.1 | 84 | 23 |
| May 4 | 63.1 | 37.4 | 87 | 22 |
| May 5 | 63.4 | 37.8 | 87 | 20 |
| May 6 | 63.7 | 38.1 | 90 | 23 |
| May 7 | 63.8 | 38.4 | 86 | 23 |
| May 8 | 64.0 | 38.7 | 85 | 23 |
| May 9 | 64.2 | 38.9 | 84 | 24 |
| May 10 | 64.4 | 39.2 | 88 | 23 |
| May 11 | 64.7 | 39.5 | 87 | 25 |
| May 12 | 65.0 | 39.8 | 92 | 22 |
| May 13 | 65.4 | 40.2 | 89 | 23 |
| May 14 | 65.7 | 40.5 | 88 | 25 |
| May 15 | 66.2 | 40.8 | 90 | 26 |
| May 16 | 66.5 | 41.2 | 91 | 28 |
| May 17 | 66.8 | 41.5 | 90 | 26 |
| May 18 | 67.1 | 41.9 | 91 | 26 |
| May 19 | 67.4 | 42.2 | 90 | 24 |
| May 20 | 67.6 | 42.5 | 90 | 28 |
| May 21 | 68.0 | 42.8 | 89 | 27 |
| May 22 | 68.4 | 43.1 | 86 | 29 |
| May 23 | 68.6 | 43.4 | 89 | 26 |
| May 24 | 68.9 | 43.7 | 93 | 29 |
| May 25 | 69.2 | 44.0 | 89 | 25 |
| May 26 | 69.4 | 44.3 | 88 | 29 |
| May 27 | 69.5 | 44.5 | 90 | 27 |
| May 28 | 69.6 | 44.7 | 95 | 28 |
| May 29 | 69.8 | 44.9 | 91 | 27 |
| May 30 | 70.0 | 45.0 | 92 | 29 |
| May 31 | 70.1 | 45.2 | 88 | 27 |