WEATHER IN Helena
Climate tables. Data for Helena.
Monthly temperature
| Month | Record low | Average low | Average | Average high | Record high |
| january | -41.1 (1957) | -10.3 | -5.0 | 0.2 | 17.2 (1902) |
| february | -41.1 (1996) | -8.2 | -2.7 | 2.9 | 20.6 (1995) |
| march | -34.4 (1955) | -4.1 | 2.3 | 8.6 | 25.6 (2004) |
| april | -23.3 (1936) | 0.2 | 6.9 | 13.7 | 30.0 (1910) |
| may | -8.3 (1954) | 5.3 | 12.2 | 19.1 | 35.0 (1919) |
| june | -1.1 (1999) | 9.3 | 16.5 | 23.7 | 38.9 (1900) |
| july | 2.2 (1898) | 12.8 | 21.4 | 30.1 | 40.6 (2002) |
| august | -2.2 (1992) | 11.6 | 20.4 | 29.2 | 40.6 (1969) |
| september | -14.4 (1926) | 7.0 | 14.9 | 22.9 | 37.2 (1967) |
| october | -22.2 (1991) | 0.8 | 7.5 | 14.2 | 30.6 (2001) |
| november | -39.4 (1959) | -5.1 | 0.4 | 6.0 | 23.9 (1999) |
| december | -40.0 (1880) | -9.9 | -4.8 | 0.3 | 17.8 (1918) |
| year | -41.1 (1957) | 0.3 | 7.4 | 14.5 | 40.6 (2002) |
Monthly precipitation
| Month | Average | Record low | Record high | Daily high |
| january | 10 | 0.0 (1987) | 95 (1884) | 29 (1881) |
| february | 11 | 0.5 (1991) | 50 (2014) | 21 (1895) |
| march | 13 | 0.3 (1881) | 61 (1898) | 20 (1898) |
| april | 26 | 0.3 (1919) | 76 (1975) | 28 (1900) |
| may | 50 | 6 (1928) | 169 (1927) | 52 (1964) |
| june | 56 | 2 (1985) | 143 (1892) | 55 (1915) |
| july | 27 | 2 (2005) | 119 (1993) | 35 (1975) |
| august | 26 | 0.0 (1940) | 107 (1974) | 48 (1933) |
| september | 24 | 0.0 (1880) | 93 (1882) | 53 (1882) |
| october | 20 | 0.5 (1978) | 71 (1925) | 57 (1891) |
| november | 15 | 0.3 (1939) | 84 (1896) | 33 (1896) |
| december | 12 | 0.0 (1930) | 118 (1880) | 25 (1880) |
| year | 285 | 159 (1973) | 532 (1975) | 57 (1891) |
Number of days with solid, liquid, and mixed precipitation
| Type of precipitation | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Wind speed, m/s
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different wind directions, %
| direction | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Air humidity, %
| jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
Snow cover
| Month | jul | aug | sep | oct | nov | dec | jan | feb | mar | apr | may | jun | Year |
| number of days | |||||||||||||
| height (sm) | |||||||||||||
| max height (sm) |
Cloudy, score
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| total | |||||||||||||
| low |
Number of clear, cloudy and cloudy days
| month | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
| Total cloud | |||||||||||||
| Low cloud | |||||||||||||
Number of days with different phenomena
| phenomenon | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |
The frequency of different types of clouds, %
| type of clouds | jan | feb | mar | apr | may | jun | jul | aug | sep | oct | nov | dec | Year |