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
Dec 1 -9.4° 2.8° -33° (1985) 19° (1988) 0.02" NA
Dec 2 -9.4° 2.8° -33° (1919) 17° (1907) 0.02" NA
Dec 3 -9.4° 2.2° -30° (1972) 19° (1907) 0.02" NA
Dec 4 -9.4° 2.2° -32° (1928) 22° (1907) 0.02" NA
Dec 5 -10° 2.2° -30° (1972) 23° (1939) 0.02" NA
Dec 6 -10° 2.2° -32° (1972) 18° (1939) 0.02" NA
Dec 7 -10° 2.2° -36° (1972) 18° (1939) 0.02" NA
Dec 8 -10° 1.7° -36° (1972) 19° (1930) 0.02" NA
Dec 9 -10° 1.7° -38° (1919) 18° (1915) 0.02" NA
Dec 10 -10.6° 1.7° -30° (1961) 18° (1990) 0.02" NA
Dec 11 -10.6° 1.7° -33° (1932) 18° (1939) 0.03" NA
Dec 12 -10.6° 1.7° -31° (1922) 16° (1924) 0.03" NA
Dec 13 -10.6° 1.7° -30° (1963) 18° (1960) 0.03" NA
Dec 14 -10.6° 1.1° -31° (1922) 16° (1924) 0.03" NA
Dec 15 -10.6° 1.1° -34° (1964) 17° (1962) 0.03" NA
Dec 16 -11.1° 1.1° -35° (1964) 16° (1980) 0.03" NA
Dec 17 -11.1° 1.1° -34° (1924) 18° (1925) 0.03" NA
Dec 18 -11.1° 1.1° -38° (1924) 17° (1979) 0.03" NA
Dec 19 -11.1° 1.1° -33° (1924) 16° (2004) 0.03" NA
Dec 20 -11.1° 0.6° -33° (1990) 16° (1900) 0.03" NA
Dec 21 -11.1° 0.6° -37° (1990) 16° (1900) 0.03" NA
Dec 22 -11.1° 0.6° -36° (1990) 14° (1994) 0.03" NA
Dec 23 -11.7° 0.6° -38° (1983) 16° (1994) 0.03" NA
Dec 24 -11.7° 0.6° -41° (1983) 13° (1994) 0.03" NA
Dec 25 -11.7° 0.6° -34° (1983) 12° (1995) 0.03" NA
Dec 26 -11.7° 0.6° -30° (1904) 13° (1972) 0.03" NA
Dec 27 -11.7° 0.6° -36° (1916) 16° (1980) 0.03" NA
Dec 28 -11.7° -38° (1968) 13° (1919) 0.03" NA
Dec 29 -11.7° -41° (1968) 13° (1986) 0.03" NA
Dec 30 -11.7° -37° (1978) 14° (1904) 0.03" NA
Dec 31 -11.7° -40° (1927) 16° (1926) 0.03" NA
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