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
Apr 1 -3.9° 8.9° -24° (1908) 22° (1991) 0.04" NA
Apr 2 -3.3° 8.9° -27° (1936) 23° (1921) 0.04" NA
Apr 3 -3.3° 9.4° -20° (1936) 23° (1992) 0.04" NA
Apr 4 -3.3° 9.4° -13° (1935) 22° (1944) 0.04" NA
Apr 5 -3.3° 10° -22° (1936) 23° (1969) 0.04" NA
Apr 6 -2.8° 10° -17° (1975) 27° (1930) 0.04" NA
Apr 7 -2.8° 10° -14° (1926) 28° (1930) 0.04" NA
Apr 8 -2.8° 10.6° -21° (1982) 23° (1910) 0.04" NA
Apr 9 -2.8° 10.6° -16° (1921) 27° (1910) 0.04" NA
Apr 10 -2.2° 10.6° -18° (1995) 25° (1898) 0.04" NA
Apr 11 -2.2° 11.1° -24° (1940) 27° (1925) 0.04" NA
Apr 12 -2.2° 11.1° -18° (1997) 26° (1976) 0.04" NA
Apr 13 -2.2° 11.1° -17° (1928) 28° (1908) 0.04" NA
Apr 14 -1.7° 11.7° -18° (1986) 28° (1915) 0.04" NA
Apr 15 -1.7° 11.7° -24° (1896) 27° (1913) 0.04" NA
Apr 16 -1.7° 12.2° -23° (1896) 27° (1926) 0.04" NA
Apr 17 -1.1° 12.2° -16° (1896) 27° (1923) 0.04" NA
Apr 18 -1.1° 12.2° -13° (1928) 27° (1936) 0.04" NA
Apr 19 -1.1° 12.8° -16° (1941) 30° (1910) 0.05" NA
Apr 20 -1.1° 12.8° -18° (1927) 29° (1908) 0.05" NA
Apr 21 -0.6° 12.8° -17° (1967) 28° (1906) 0.05" NA
Apr 22 -0.6° 12.8° -17° (1967) 30° (1906) 0.05" NA
Apr 23 -0.6° 13.3° -11° (1931) 27° (1906) 0.05" NA
Apr 24 13.3° -8° (1958) 29° (1910) 0.05" NA
Apr 25 13.3° -13° (1960) 27° (1898) 0.05" NA
Apr 26 13.9° -8° (1929) 30° (1910) 0.06" NA
Apr 27 13.9° -9° (1994) 28° (1928) 0.06" NA
Apr 28 0.6° 13.9° -13° (1907) 30° (1939) 0.06" NA
Apr 29 0.6° 14.4° -11° (1903) 32° (1939) 0.06" NA
Apr 30 0.6° 14.4° -15° (1909) 28° (1926) 0.07" NA
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