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
Jul 1 48° 76° 34° (1901) 95° (1990) 0.07" 0"
Jul 2 48° 77° 34° (1915) 102° (1908) 0.08" 0"
Jul 3 49° 77° 34° (1972) 97° (1936) 0.07" 0"
Jul 4 49° 77° 32° (1915) 98° (1937) 0.08" 0"
Jul 5 49° 78° 35° (1901) 99° (1936) 0.07" 0"
Jul 6 49° 78° 37° (1902) 98° (2007) 0.07" 0"
Jul 7 49° 78° 36° (1971) 94° (1900) 0.07" 0"
Jul 8 49° 79° 35° (1903) 99° (1930) 0.07" 0"
Jul 9 50° 79° 27° (1903) 96° (1930) 0.07" 0"
Jul 10 50° 79° 39° (1902) 100° (1939) 0.06" 0"
Jul 11 50° 80° 33° (1951) 98° (1925) 0.07" 0"
Jul 12 50° 80° 36° (2008) 99° (2002) 0.07" 0"
Jul 13 50° 80° 37° (1909) 101° (2002) 0.07" 0"
Jul 14 50° 81° 35° (1913) 101° (2002) 0.06" 0"
Jul 15 51° 81° 36° (1913) 98° (1930) 0.06" 0"
Jul 16 51° 81° 34° (1999) 98° (1919) 0.07" 0"
Jul 17 51° 81° 38° (1982) 98° (1910) 0.06" 0"
Jul 18 51° 82° 36° (1900) 100° (1955) 0.05" 0"
Jul 19 51° 82° 35° (1897) 99° (1960) 0.06" 0"
Jul 20 51° 82° 36° (1900) 96° (1921) 0.06" 0"
Jul 21 51° 82° 33° (1926) 101° (1931) 0.06" 0"
Jul 22 51° 82° 37° (1914) 99° (1936) 0.06" 0"
Jul 23 51° 83° 35° (1896) 104° (1931) 0.05" 0"
Jul 24 52° 83° 33° (1896) 101° (1929) 0.05" 0"
Jul 25 52° 83° 38° (1948) 101° (1933) 0.06" 0"
Jul 26 52° 83° 38° (2005) 97° (1933) 0.05" 0"
Jul 27 52° 83° 38° (1913) 100° (1947) 0.05" 0"
Jul 28 52° 83° 35° (1929) 99° (1914) 0.05" 0"
Jul 29 52° 83° 35° (1904) 98° (1929) 0.06" 0"
Jul 30 52° 83° 32° (1904) 103° (1908) 0.05" 0"
Jul 31 52° 83° 35° (1968) 105° (1900) 0.05" 0"
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