Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 13° 34° -46° (1929) 73° (1981) 0.57" 9.8"
February 15° 37° -42° (1936) 70° (1932) 0.46" 5.3"
March 22° 44° -28° (1945) 88° (1902) 0.99" 12"
April 29° 54° -17° (1936) 89° (1939) 1.41" 8.1"
May 38° 63° 11° (1946) 98° (1931) 2.85" 4.8"
June 45° 71° 21° (1914) 105° (1900) 3.08" 0.1"
July 50° 81° 27° (1903) 105° (1900) 1.93" 0"
August 50° 81° 27° (1910) 103° (1961) 1.73" 0"
September 41° 69° 6° (1926) 99° (1909) 1.35" 1.6"
October 31° 57° -10° (1935) 92° (1905) 1.13" 3.9"
November 21° 43° -30° (1985) 81° (1908) 0.71" 7.5"
December 13° 34° -42° (1983) 74° (1939) 0.66" 9.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Oct 1 35° 62° 15° (1950) 86° (1992) 0.05" 0.1"
Oct 2 35° 62° 19° (1999) 88° (1922) 0.04" 0.2"
Oct 3 35° 62° 18° (1999) 87° (1922) 0.05" 0.1"
Oct 4 34° 61° 11° (1916) 92° (1905) 0.04" 0.1"
Oct 5 34° 61° 12° (1916) 87° (1905) 0.04" 0.1"
Oct 6 34° 61° 12° (2000) 83° (1934) 0.04" 0.1"
Oct 7 34° 60° 16° (1985) 86° (1943) 0.04" 0.2"
Oct 8 33° 60° 8° (1985) 84° (1980) 0.04" 0.1"
Oct 9 33° 59° -1° (1985) 84° (1911) 0.04" 0.1"
Oct 10 33° 59° 5° (2009) 84° (1934) 0.04" 0.1"
Oct 11 32° 59° 12° (2009) 90° (1934) 0.04" 0.1"
Oct 12 32° 58° 7° (2009) 87° (1934) 0.04" 0.1"
Oct 13 32° 58° 7° (1969) 84° (1964) 0.04" 0.2"
Oct 14 31° 58° 10° (1969) 82° (1929) 0.04" 0.1"
Oct 15 31° 57° 14° (1976) 87° (1924) 0.04" 0.1"
Oct 16 31° 57° 9° (1930) 85° (1927) 0.04" 0.2"
Oct 17 31° 56° 5° (1930) 83° (1927) 0.04" 0.1"
Oct 18 30° 56° 1° (1905) 82° (1927) 0.03" 0.1"
Oct 19 30° 56° -4° (1905) 82° (1927) 0.04" 0.1"
Oct 20 30° 55° 10° (1916) 84° (1927) 0.03" 0.1"
Oct 21 29° 55° 9° (1981) 81° (1927) 0.04" 0.2"
Oct 22 29° 54° 3° (1957) 80° (1915) 0.03" 0.1"
Oct 23 29° 54° 3° (1957) 81° (1903) 0.03" 0.1"
Oct 24 28° 54° -1° (1919) 82° (2007) 0.03" 0.1"
Oct 25 28° 53° -8° (1923) 80° (1924) 0.03" 0.2"
Oct 26 28° 53° 1° (1923) 81° (1944) 0.03" 0.1"
Oct 27 28° 52° -4° (1919) 75° (1944) 0.03" 0.1"
Oct 28 27° 52° -7° (1991) 78° (1937) 0.03" 0.2"
Oct 29 27° 51° -7° (1991) 79° (1968) 0.03" 0.1"
Oct 30 27° 51° -10° (1935) 75° (1906) 0.02" 0.2"
Oct 31 26° 50° -8° (2002) 73° (1990) 0.03" 0.1"
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