Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -12° -43.3° (1929) 22.8° (1981) 0.89" 11.1"
February -9° -41.1° (1936) 21.1° (1932) 0.57" 6.4"
March -6° -33.3° (1945) 31.1° (1902) 1.16" 11.6"
April -2° 12° -27.2° (1936) 31.7° (1939) 1.38" 8.1"
May 17° -11.7° (1946) 36.7° (1931) 2.92" 4.7"
June 22° -6.1° (1914) 40.6° (1900) 2.93" 0"
July 10° 26° -2.8° (1903) 40.6° (1900) 2.1" 0"
August 27° -2.8° (1910) 39.4° (1961) 1.89" 0"
September 21° -14.4° (1926) 37.2° (1909) 1.38" 1.3"
October -1° 14° -23.3° (1935) 33.3° (1905) 1.06" 4.5"
November -7° -34.4° (1985) 27.2° (1908) 0.74" 7.2"
December -11° -41.1° (1983) 23.3° (1939) 0.83" 9.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 7.2° 23.9° -3° (1930) 36° (1983) 0.06" NA
Sep 2 7.2° 23.3° -2° (1900) 36° (1945) 0.05" NA
Sep 3 7.2° 23.3° -2° (1929) 34° (1916) 0.05" NA
Sep 4 6.7° 22.8° -7° (1929) 34° (1924) 0.05" NA
Sep 5 6.7° 22.8° -1° (1929) 36° (1931) 0.05" NA
Sep 6 6.1° 22.2° -6° (1929) 34° (1908) 0.05" NA
Sep 7 6.1° 22.2° -8° (1929) 35° (1998) 0.05" NA
Sep 8 6.1° 22.2° -7° (1929) 35° (1979) 0.05" NA
Sep 9 5.6° 21.7° -11° (1896) 37° (1909) 0.05" NA
Sep 10 5.6° 21.7° -9° (1896) 33° (1966) 0.05" NA
Sep 11 5.6° 21.1° -12° (1921) 37° (1908) 0.05" NA
Sep 12 21.1° -6° (1921) 32° (1959) 0.05" NA
Sep 13 20.6° -5° (1896) 32° (1959) 0.05" NA
Sep 14 20.6° -7° (1970) 34° (1948) 0.05" NA
Sep 15 4.4° 20.6° -5° (1916) 34° (1908) 0.05" NA
Sep 16 4.4° 20° -6° (1912) 33° (1998) 0.05" NA
Sep 17 4.4° 20° -5° (1902) 32° (1920) 0.05" NA
Sep 18 4.4° 19.4° -7° (1965) 32° (1966) 0.04" NA
Sep 19 3.9° 19.4° -6° (1943) 33° (1938) 0.04" NA
Sep 20 3.9° 19.4° -8° (1983) 33° (1922) 0.04" NA
Sep 21 3.9° 18.9° -7° (1995) 33° (1938) 0.04" NA
Sep 22 3.3° 18.9° -5° (2000) 35° (1905) 0.04" NA
Sep 23 3.3° 18.9° -8° (1926) 32° (1966) 0.04" NA
Sep 24 3.3° 18.3° -14° (1926) 32° (1922) 0.04" NA
Sep 25 2.8° 18.3° -11° (1926) 33° (1922) 0.04" NA
Sep 26 2.8° 18.3° -13° (1900) 32° (1922) 0.04" NA
Sep 27 2.8° 17.8° -8° (1900) 31° (1963) 0.04" NA
Sep 28 2.8° 17.8° -8° (1984) 31° (1909) 0.04" NA
Sep 29 2.2° 17.8° -7° (1912) 32° (1967) 0.04" NA
Sep 30 2.2° 17.8° -8° (1985) 34° (1906) 0.04" NA
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