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
Jan 1 -11.7° -36° (1942) 13° (1939) 0.03" NA
Jan 2 -11.7° -33° (1928) 12° (2003) 0.03" NA
Jan 3 -12.2° -29° (1910) 13° (1981) 0.03" NA
Jan 4 -12.2° -32° (2004) 13° (1938) 0.03" NA
Jan 5 -12.2° -33° (1909) 13° (1958) 0.03" NA
Jan 6 -12.2° -32° (1913) 12.8° (2006) 0.03" NA
Jan 7 -12.2° -0.6° -34° (1937) 20° (2003) 0.03" NA
Jan 8 -12.2° -0.6° -36° (1909) 16° (1958) 0.03" NA
Jan 9 -12.2° -0.6° -33° (1909) 16° (1919) 0.03" NA
Jan 10 -12.2° -0.6° -38° (1909) 14° (1941) 0.03" NA
Jan 11 -12.2° -0.6° -38° (1916) 16° (1987) 0.03" NA
Jan 12 -12.2° -0.6° -36° (1916) 17° (1987) 0.03" NA
Jan 13 -12.2° -0.6° -37° (1972) 16° (1944) 0.03" NA
Jan 14 -12.2° -0.6° -37° (1972) 16.1° (2006) 0.03" NA
Jan 15 -12.2° -0.6° -30° (1896) 16° (1973) 0.03" NA
Jan 16 -12.2° -35° (1916) 18° (1974) 0.03" NA
Jan 17 -12.2° -30° (1940) 13° (1976) 0.03" NA
Jan 18 -12.2° -35° (1963) 14° (1921) 0.03" NA
Jan 19 -11.7° -34° (1949) 16° (1986) 0.03" NA
Jan 20 -11.7° -36° (1949) 14° (1981) 0.03" NA
Jan 21 -11.7° -37° (1927) 16° (1981) 0.03" NA
Jan 22 -11.7° -33° (1963) 23° (1981) 0.03" NA
Jan 23 -11.7° -39° (1929) 18° (2005) 0.03" NA
Jan 24 -11.7° -36° (1949) 18° (2005) 0.03" NA
Jan 25 -11.7° -35° (1969) 18.3° (2006) 0.03" NA
Jan 26 -11.7° 0.6° -33° (1902) 16° (1906) 0.03" NA
Jan 27 -11.7° 0.6° -41° (1916) 16° (1906) 0.03" NA
Jan 28 -11.1° 0.6° -43° (1929) 19° (1941) 0.02" NA
Jan 29 -11.1° 0.6° -40° (1929) 18° (1931) 0.02" NA
Jan 30 -11.1° 0.6° -36° (1996) 18° (1941) 0.02" NA
Jan 31 -11.1° 0.6° -40° (1917) 16° (1992) 0.02" NA
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