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
Sep 1 46° 75° 26° (1930) 97° (1983) 0.04" 0"
Sep 2 45° 75° 29° (1900) 96° (1945) 0.05" 0"
Sep 3 45° 75° 29° (1929) 93° (1916) 0.05" 0"
Sep 4 45° 74° 20° (1929) 93° (1924) 0.05" 0"
Sep 5 44° 74° 28° (1956) 96° (1931) 0.05" 0.1"
Sep 6 44° 73° 21° (1929) 94° (1908) 0.05" 0"
Sep 7 44° 73° 18° (1929) 95° (1998) 0.05" 0"
Sep 8 43° 72° 19° (1929) 95° (1979) 0.05" 0.1"
Sep 9 43° 72° 13° (1896) 99° (1909) 0.04" 0"
Sep 10 43° 71° 16° (1896) 91° (1966) 0.05" 0"
Sep 11 42° 71° 11° (1921) 98° (1908) 0.04" 0.1"
Sep 12 42° 71° 22° (1921) 89° (1959) 0.05" 0"
Sep 13 42° 70° 23° (1896) 90° (1959) 0.04" 0.1"
Sep 14 41° 70° 19° (1970) 94° (1948) 0.05" 0"
Sep 15 41° 69° 23° (1916) 93° (1908) 0.04" 0"
Sep 16 41° 69° 22° (1912) 91° (1998) 0.04" 0.1"
Sep 17 40° 68° 23° (1902) 91° (2009) 0.05" 0.1"
Sep 18 40° 68° 19° (1965) 90° (1966) 0.04" 0"
Sep 19 40° 67° 22° (1943) 92° (1938) 0.05" 0.1"
Sep 20 39° 67° 18° (1983) 92° (1922) 0.04" 0"
Sep 21 39° 67° 19° (1995) 92° (1938) 0.05" 0.1"
Sep 22 39° 66° 23° (2000) 95° (1905) 0.04" 0.1"
Sep 23 38° 66° 18° (1926) 90° (1966) 0.04" 0.1"
Sep 24 38° 65° 6° (1926) 89° (1922) 0.05" 0"
Sep 25 37° 65° 13° (1926) 92° (1922) 0.04" 0.1"
Sep 26 37° 64° 9° (1900) 89° (1922) 0.04" 0.1"
Sep 27 37° 64° 17° (1900) 88° (1963) 0.04" 0.1"
Sep 28 36° 64° 17° (1984) 87° (1909) 0.05" 0.1"
Sep 29 36° 63° 20° (1912) 89° (1967) 0.04" 0.1"
Sep 30 36° 63° 17° (1985) 93° (1906) 0.04" 0.1"
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