WEATHER IN Lewistown
Climate tables. Data for Lewistown.
Monthly temperature
| Month | Record low | Average low | Average | Average high | Record high |
| january | -43.3 (1929) | -10.6 | -4.6 | 1.3 | 22.8 (1981) |
| february | -41.1 (1936) | -10.1 | -4.1 | 1.8 | 21.1 (1932) |
| march | -33.3 (1896) | -5.9 | 0.5 | 6.8 | 31.1 (1902) |
| april | -27.2 (1936) | -1.8 | 4.9 | 11.7 | 31.7 (1939) |
| may | -11.7 (1929) | 3.0 | 10.0 | 17.0 | 36.7 (1931) |
| june | -6.1 (1914) | 7.3 | 14.4 | 21.7 | 40.6 (1900) |
| july | -2.8 (1903) | 10.4 | 18.9 | 27.6 | 40.6 (1900) |
| august | -2.8 (1910) | 9.8 | 18.6 | 27.3 | 39.4 (1961) |
| september | -14.4 (1926) | 5.3 | 13.3 | 21.3 | 37.2 (1909) |
| october | -23.3 (1935) | -0.7 | 6.3 | 13.3 | 33.3 (1905) |
| november | -34.4 (1985) | -6.2 | 0.1 | 6.3 | 27.2 (1908) |
| december | -41.1 (1983) | -10.2 | -4.3 | 1.7 | 23.3 (1939) |
| year | -43.3 (1929) | -0.8 | 6.1 | 13.1 | 40.6 (1900) |
Monthly precipitation
| Month | Average | Record low | Record high | Daily high |
| january | 15 | 0.3 (1901) | 70 (1978) | 22 (1978) |
| february | 12 | 0.5 (1901) | 56 (1914) | 51 (1914) |
| march | 22 | 4 (1900) | 80 (1898) | 32 (1995) |
| april | 43 | 2 (1949) | 99 (1896) | 44 (1927) |
| may | 73 | 5 (1900) | 233 (1981) | 71 (1962) |
| june | 85 | 13 (1904) | 278 (1944) | 79 (1906) |
| july | 45 | 1 (1908) | 152 (1928) | 71 (1907) |
| august | 43 | 0.5 (1901) | 141 (1985) | 76 (2002) |
| september | 35 | 0.0 (1990) | 125 (1941) | 45 (1959) |
| october | 32 | 0.3 (1902) | 147 (1908) | 97 (1908) |
| november | 17 | 0.3 (1907) | 101 (1897) | 46 (1896) |
| december | 13 | 0.0 (1905) | 121 (1917) | 24 (1937) |
| year | 428 | 238 (2004) | 714 (1978) | 97 (1908) |
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 |