WEATHER IN Helena
Monthly temperature
| Month | Record low | Average low | Average | Average high | Record high |
| january | -42 (1957) | 13.5 | 23.0 | 32.4 | 63 (1902) |
| february | -42 (1996) | 17.2 | 27.2 | 37.2 | 69 (1995) |
| march | -30 (1955) | 24.6 | 36.1 | 47.5 | 78 (2004) |
| april | -10 (1936) | 32.4 | 44.5 | 56.7 | 86 (1910) |
| may | 17 (1954) | 41.5 | 53.9 | 66.4 | 95 (1919) |
| june | 30 (1999) | 48.7 | 61.7 | 74.7 | 102 (1900) |
| july | 36 (1898) | 55.1 | 70.6 | 86.1 | 105 (2002) |
| august | 28 (1992) | 52.9 | 68.8 | 84.6 | 105 (1969) |
| september | 6 (1926) | 44.6 | 58.9 | 73.3 | 99 (1967) |
| october | -8 (1991) | 33.5 | 45.5 | 57.6 | 87 (2001) |
| november | -39 (1959) | 22.8 | 32.8 | 42.8 | 75 (1999) |
| december | -40 (1880) | 14.2 | 23.4 | 32.6 | 64 (1918) |
| year | -42 (1957) | 32.6 | 45.3 | 58.1 | 105 (2002) |
Monthly precipitation
| Month | Average | Record low | Record high | Daily high |
| january | 0.39 | 0.00 (1987) | 3.75 (1884) | 1.13 (1881) |
| february | 0.42 | 0.02 (1991) | 1.98 (2014) | 0.82 (1895) |
| march | 0.52 | 0.01 (1881) | 2.39 (1898) | 0.78 (1898) |
| april | 1.02 | 0.01 (1919) | 3.00 (1975) | 1.09 (1900) |
| may | 1.95 | 0.24 (1928) | 6.67 (1927) | 2.06 (1964) |
| june | 2.21 | 0.08 (1985) | 5.63 (1892) | 2.16 (1915) |
| july | 1.06 | 0.07 (2005) | 4.70 (1993) | 1.36 (1975) |
| august | 1.04 | 0.00 (1940) | 4.23 (1974) | 1.89 (1933) |
| september | 0.96 | 0.00 (1880) | 3.66 (1882) | 2.10 (1882) |
| october | 0.78 | 0.02 (1978) | 2.81 (1925) | 2.23 (1891) |
| november | 0.59 | 0.01 (1939) | 3.29 (1896) | 1.30 (1896) |
| december | 0.46 | 0.00 (1930) | 4.64 (1880) | 1.00 (1880) |
| year | 11.22 | 6.26 (1973) | 20.94 (1975) | 2.23 (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 |