Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -11° -43.3° (1929) 22.8° (1981) 0.57" 9.8"
February -9° -41.1° (1936) 21.1° (1932) 0.46" 5.3"
March -6° -33.3° (1945) 31.1° (1902) 0.99" 12"
April -2° 12° -27.2° (1936) 31.7° (1939) 1.41" 8.1"
May 17° -11.7° (1946) 36.7° (1931) 2.85" 4.8"
June 22° -6.1° (1914) 40.6° (1900) 3.08" 0.1"
July 10° 27° -2.8° (1903) 40.6° (1900) 1.93" 0"
August 10° 27° -2.8° (1910) 39.4° (1961) 1.73" 0"
September 21° -14.4° (1926) 37.2° (1909) 1.35" 1.6"
October -1° 14° -23.3° (1935) 33.3° (1905) 1.13" 3.9"
November -6° -34.4° (1985) 27.2° (1908) 0.71" 7.5"
December -11° -41.1° (1983) 23.3° (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 24° -3° (1930) 36° (1983) 0.04" 0"
Sep 2 24° -2° (1900) 36° (1945) 0.05" 0"
Sep 3 24° -2° (1929) 34° (1916) 0.05" 0"
Sep 4 23° -7° (1929) 34° (1924) 0.05" 0"
Sep 5 23° -2° (1956) 36° (1931) 0.05" 0.1"
Sep 6 23° -6° (1929) 34° (1908) 0.05" 0"
Sep 7 23° -8° (1929) 35° (1998) 0.05" 0"
Sep 8 22° -7° (1929) 35° (1979) 0.05" 0.1"
Sep 9 22° -11° (1896) 37° (1909) 0.04" 0"
Sep 10 22° -9° (1896) 33° (1966) 0.05" 0"
Sep 11 22° -12° (1921) 37° (1908) 0.04" 0.1"
Sep 12 21° -6° (1921) 32° (1959) 0.05" 0"
Sep 13 21° -5° (1896) 32° (1959) 0.04" 0.1"
Sep 14 21° -7° (1970) 34° (1948) 0.05" 0"
Sep 15 21° -5° (1916) 34° (1908) 0.04" 0"
Sep 16 20° -6° (1912) 33° (1998) 0.04" 0.1"
Sep 17 20° -5° (1902) 33° (2009) 0.05" 0.1"
Sep 18 20° -7° (1965) 32° (1966) 0.04" 0"
Sep 19 20° -6° (1943) 33° (1938) 0.05" 0.1"
Sep 20 19° -8° (1983) 33° (1922) 0.04" 0"
Sep 21 19° -7° (1995) 33° (1938) 0.05" 0.1"
Sep 22 19° -5° (2000) 35° (1905) 0.04" 0.1"
Sep 23 19° -8° (1926) 32° (1966) 0.04" 0.1"
Sep 24 18° -14° (1926) 32° (1922) 0.05" 0"
Sep 25 18° -11° (1926) 33° (1922) 0.04" 0.1"
Sep 26 18° -13° (1900) 32° (1922) 0.04" 0.1"
Sep 27 18° -8° (1900) 31° (1963) 0.04" 0.1"
Sep 28 18° -8° (1984) 31° (1909) 0.05" 0.1"
Sep 29 17° -7° (1912) 32° (1967) 0.04" 0.1"
Sep 30 17° -8° (1985) 34° (1906) 0.04" 0.1"
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