| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 50.5 | 31.7 | 79 | -9 | 4.3 | 0.2 |
| February | 55.8 | 35.1 | 82 | -3 | 4.3 | 0.1 |
| March | 64.4 | 43.3 | 92 | 11 | 4.6 | 0.0 |
| April | 73.7 | 51.5 | 95 | 27 | 5.5 | 0.0 |
| May | 82.4 | 61.2 | 103 | 35 | 4.9 | 0.0 |
| June | 89.7 | 69.2 | 108 | 44 | 3.5 | 0.0 |
| July | 91.7 | 72.3 | 111 | 49 | 3.4 | 0.0 |
| August | 91.4 | 71.5 | 108 | 48 | 2.8 | 0.0 |
| September | 86.3 | 64.7 | 113 | 30 | 2.4 | 0.0 |
| October | 75.7 | 52.0 | 98 | 25 | 3.5 | 0.0 |
| November | 63.0 | 41.7 | 88 | 12 | 4.3 | 0.0 |
| December | 54.0 | 34.6 | 81 | -4 | 4.8 | 0.1 |
| Entire year | 73.1 | 52.5 | 113 | -9 | 48.3 | 0.4 |
|
More Helena Weather Records
1892–2024
|
||
|---|---|---|
| Highest daily low | 86 °F | July 20, 1998 |
| Lowest daily high | 8 °F | December 23, 1989 |
| Greatest daily range (Difference of high and low) |
57 °F | January 20, 1985 |
| Greatest difference in daily high over two conscutive days |
49 °F | Jan 25–26, 1943 |
| Most daily precipitation | 10.1 inches | May 28, 1893 |
| Most monthly precipitation | 18.9 inches | April 1991 |
| Most yearly precipitation | 71.8 inches | 1906 |
| Most yearly days with precipitation | 136 | 1905 |
| Earliest snow in season | November 4 | 1936 |
| Latest snow in season | March 27 | 1937 |
| Most daily snow | 13.0 inches | December 23, 1963 |
| Most monthly snow | 23.0 inches | January 1918 |
| Most yearly snow | 23.0 inches | 1918 |
| Most snow in a winter | 24.0 inches | 1917–1918 |
| Greatest snow accumulation | 13.0 inches | December 24, 1963 |
| Earliest freeze | September 30 | 1967 |
| Earliest day ≥ 90 °F | March 24 | 1910 |
| Earliest day ≥ 100 °F | May 27 | 1926 |
| Latest freeze | April 22 | 1931 |
| Latest day ≥ 90 °F | October 31 | 1937 |
| Latest day ≥ 100 °F | September 22 | 2005 |
| Most days in a year < 0 °F | 3 | 1989 |
| Most days in a year < 32 °F | 81 | 1978 |
| Most days in a year ≥ 80 °F | 196 | 2007 |
| Most days in a year ≥ 90 °F | 143 | 1925 |
| Most days in a year ≥ 100 °F | 71 | 1925 |
| Most days in a year ≥ 110 °F | 3 | 1925 |
|
Helena Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 13 days | Feb 17–29, 1944 |
| Without precipitation | 60 days | Aug 25 – Oct 23, 2015 |
| With snow | 4 days | Jan 29 – Feb 1, 1951 |
| High temperature at or below freezing |
9 days | Dec 17–25, 1989 |
| High temperature ≥ 80 °F | 139 days | Apr 30 – Sep 15, 2007 |
| High temperature ≥ 90 °F | 86 days | Jun 17 – Sep 10, 1954 |
| High temperature ≥ 100 °F | 14 days | Jul 6–19, 1980 |
| Years | Station | Coordinates |
|---|---|---|
| 1892–2024 | Helena | location |