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
Oct 1 2.2° 17.2° -7° (1944) 30° (1992) 0.04" NA
Oct 2 1.7° 17.2° -7° (1999) 31° (1922) 0.04" NA
Oct 3 1.7° 17.2° -8° (1999) 31° (1922) 0.04" NA
Oct 4 1.7° 16.7° -12° (1916) 33° (1905) 0.04" NA
Oct 5 1.7° 16.7° -11° (1916) 31° (1905) 0.04" NA
Oct 6 1.1° 16.7° -9° (1941) 28° (1934) 0.04" NA
Oct 7 1.1° 16.1° -9° (1985) 30° (1943) 0.04" NA
Oct 8 1.1° 16.1° -13° (1985) 29° (1980) 0.04" NA
Oct 9 1.1° 16.1° -18° (1985) 29° (1911) 0.04" NA
Oct 10 0.6° 15.6° -11° (1987) 29° (1934) 0.04" NA
Oct 11 0.6° 15.6° -8° (1959) 32° (1934) 0.04" NA
Oct 12 0.6° 15.6° -8° (1969) 31° (1934) 0.04" NA
Oct 13 15° -14° (1969) 29° (1964) 0.04" NA
Oct 14 15° -12° (1969) 28° (1929) 0.03" NA
Oct 15 14.4° -10° (1976) 31° (1924) 0.03" NA
Oct 16 -0.6° 14.4° -13° (1930) 29° (1927) 0.03" NA
Oct 17 -0.6° 13.9° -15° (1930) 28° (1927) 0.03" NA
Oct 18 -0.6° 13.9° -17° (1905) 28° (1927) 0.03" NA
Oct 19 -1.1° 13.3° -20° (1905) 28° (1927) 0.03" NA
Oct 20 -1.1° 13.3° -12° (1916) 29° (1927) 0.03" NA
Oct 21 -1.1° 12.8° -13° (1981) 27° (1927) 0.03" NA
Oct 22 -1.7° 12.8° -12° (1936) 27° (1915) 0.03" NA
Oct 23 -1.7° 12.2° -13° (1919) 27° (1903) 0.03" NA
Oct 24 -2.2° 12.2° -18° (1919) 27.8° (2007) 0.03" NA
Oct 25 -2.2° 11.7° -22° (1923) 27° (1924) 0.03" NA
Oct 26 -2.2° 11.7° -17° (1923) 27° (1944) 0.03" NA
Oct 27 -2.8° 11.1° -20° (1919) 24° (1944) 0.03" NA
Oct 28 -2.8° 10.6° -22° (1991) 26° (1937) 0.03" NA
Oct 29 -3.3° 10.6° -22° (1991) 26° (1968) 0.03" NA
Oct 30 -3.3° 10° -23° (1935) 24° (1906) 0.03" NA
Oct 31 -3.3° 10° -22° (2002) 23° (1990) 0.03" NA
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