| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 32.3 | 12.9 | 63 | -42 | 0.4 | 6.6 |
| February | 37.6 | 17.0 | 69 | -42 | 0.4 | 6.6 |
| March | 47.7 | 24.3 | 78 | -30 | 0.5 | 4.5 |
| April | 56.7 | 32.1 | 86 | -10 | 1.0 | 2.9 |
| May | 66.4 | 41.1 | 95 | 17 | 1.9 | 0.1 |
| June | 75.0 | 48.6 | 104 | 30 | 2.2 | 0.0 |
| July | 86.1 | 54.6 | 105 | 36 | 1.1 | 0.0 |
| August | 84.8 | 52.5 | 105 | 28 | 1.0 | 0.3 |
| September | 73.4 | 44.0 | 102 | 6 | 1.0 | 0.2 |
| October | 57.5 | 32.8 | 87 | -8 | 0.8 | 2.8 |
| November | 43.0 | 22.5 | 76 | -39 | 0.6 | 5.4 |
| December | 32.7 | 13.9 | 70 | -38 | 0.4 | 7.2 |
| Entire year | 57.9 | 33.1 | 105 | -42 | 11.2 | 37.0 |
|
More Helena Weather Records
1893–2024
|
||
|---|---|---|
| Highest daily low | 74 °F | July 23, 1936 |
| Lowest daily high | -33 °F | January 31, 1893 |
| Greatest daily range (Difference of high and low) |
72 °F | December 15, 1979 |
| Greatest difference in daily high over two conscutive days |
70 °F | Jan 31 – Feb 1, 1989 |
| Most daily precipitation | 2.2 inches | June 11, 1915 |
| Most monthly precipitation | 6.7 inches | May 1927 |
| Most yearly precipitation | 20.9 inches | 1975 |
| Most yearly days with precipitation | 125 | 1975 |
| Earliest snow in season | August 22 | 1992 |
| Latest snow in season | June 19 | 1991 |
| Most daily snow | 18.8 inches | November 11, 1959 |
| Most monthly snow | 35.6 inches | January 1969 |
| Most yearly snow | 102.8 inches | 1929 |
| Most snow in a winter | 90.2 inches | 1919–1920 |
| Greatest snow accumulation | 24.0 inches | December 13, 1917 |
| Earliest freeze | August 25 | 1992 |
| Earliest day ≥ 70 °F | March 4 | 1987 |
| Earliest day ≥ 80 °F | April 8 | 2022 |
| Earliest day ≥ 90 °F | May 6 | 1966 |
| Earliest day ≥ 100 °F | June 14 | 2021 |
| Latest freeze | June 13 | 1969 |
| Latest day ≥ 70 °F | December 1 | 2021 |
| Latest day ≥ 80 °F | October 21 | 2003 |
| Latest day ≥ 90 °F | September 25 | 2001 |
| Latest day ≥ 100 °F | September 7 | 2022 |
| Most days in a year < 0 °F | 46 | 1949 |
| Most days in a year < 32 °F | 201 | 1970 |
| Most days in a year ≥ 80 °F | 103 | 2001 |
| Most days in a year ≥ 90 °F | 54 | 2022 |
| Most days in a year ≥ 100 °F | 9 | 2003 |
|
Helena Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 12 days | Feb 20 – Mar 3, 1919 |
| Without precipitation | 61 days | Jul 10 – Sep 8, 2017 |
| With snow | 10 days | Dec 5–14, 1917 |
| High temperature at or below freezing |
33 days | Jan 8 – Feb 9, 1949 |
| High temperature ≥ 80 °F | 54 days | Jun 27 – Aug 19, 2007 |
| High temperature ≥ 90 °F | 19 days | Jul 14 – Aug 1, 2021 |
| High temperature ≥ 100 °F | 4 days | Jul 29 – Aug 1, 2022 |