Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 32° -46° (1929) 73° (1981) 0.89" 11.1"
February 15° 36° -42° (1936) 70° (1932) 0.57" 6.4"
March 21° 43° -28° (1945) 88° (1902) 1.16" 11.6"
April 29° 53° -17° (1936) 89° (1939) 1.38" 8.1"
May 38° 63° 11° (1946) 98° (1931) 2.92" 4.7"
June 45° 72° 21° (1914) 105° (1900) 2.93" 0"
July 50° 79° 27° (1903) 105° (1900) 2.1" 0"
August 49° 80° 27° (1910) 103° (1961) 1.89" 0"
September 40° 69° 6° (1926) 99° (1909) 1.38" 1.3"
October 31° 57° -10° (1935) 92° (1905) 1.06" 4.5"
November 20° 42° -30° (1985) 81° (1908) 0.74" 7.2"
December 13° 34° -42° (1983) 74° (1939) 0.83" 9.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Aug 1 51° 82° 37° (2002) 96° (1908) 0.06" NA
Aug 2 51° 82° 36° (1937) 96° (1966) 0.06" NA
Aug 3 51° 82° 33° (1896) 99° (1961) 0.06" NA
Aug 4 51° 82° 38° (1937) 98° (1961) 0.06" NA
Aug 5 51° 82° 35° (1935) 103° (1961) 0.06" NA
Aug 6 51° 82° 37° (1924) 102° (1983) 0.06" NA
Aug 7 51° 82° 38° (1896) 97° (2001) 0.07" NA
Aug 8 51° 82° 33° (1896) 96° (1991) 0.07" NA
Aug 9 51° 82° 31° (1902) 100° (1940) 0.07" NA
Aug 10 50° 82° 33° (1902) 100° (2003) 0.06" NA
Aug 11 50° 81° 31° (1896) 98° (1906) 0.06" NA
Aug 12 50° 81° 31° (1916) 101° (1940) 0.06" NA
Aug 13 50° 81° 36° (1912) 97° (1973) 0.06" NA
Aug 14 50° 81° 36° (1995) 101° (1929) 0.06" NA
Aug 15 50° 81° 33° (1943) 99° (1990) 0.06" NA
Aug 16 50° 81° 32° (1905) 98° (1973) 0.06" NA
Aug 17 49° 80° 31° (1910) 98° (1906) 0.06" NA
Aug 18 49° 80° 33° (1902) 97° (1964) 0.06" NA
Aug 19 49° 80° 31° (1907) 95° (1903) 0.06" NA
Aug 20 49° 80° 32° (1916) 97° (1931) 0.06" NA
Aug 21 49° 79° 29° (1904) 97° (1969) 0.06" NA
Aug 22 48° 79° 34° (1928) 98° (1976) 0.06" NA
Aug 23 48° 79° 33° (1992) 101° (1969) 0.06" NA
Aug 24 48° 78° 31° (1934) 101° (1969) 0.06" NA
Aug 25 48° 78° 27° (1910) 98° (1926) 0.06" NA
Aug 26 47° 78° 30° (1896) 99° (1926) 0.06" NA
Aug 27 47° 77° 30° (1900) 97° (1971) 0.06" NA
Aug 28 47° 77° 33° (1918) 100° (1924) 0.06" NA
Aug 29 46° 76° 32° (1902) 93° (2006) 0.06" NA
Aug 30 46° 76° 30° (1912) 96° (1929) 0.06" NA
Aug 31 46° 75° 34° (1930) 98° (1991) 0.06" NA
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