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
Aug 1 10.6° 27.8° 3° (2002) 36° (1908) 0.06" NA
Aug 2 10.6° 27.8° 2° (1937) 36° (1966) 0.06" NA
Aug 3 10.6° 27.8° 1° (1896) 37° (1961) 0.06" NA
Aug 4 10.6° 27.8° 3° (1937) 37° (1961) 0.06" NA
Aug 5 10.6° 27.8° 2° (1935) 39° (1961) 0.06" NA
Aug 6 10.6° 27.8° 3° (1924) 39° (1983) 0.06" NA
Aug 7 10.6° 27.8° 3° (1896) 36° (2001) 0.07" NA
Aug 8 10.6° 27.8° 1° (1896) 36° (1991) 0.07" NA
Aug 9 10.6° 27.8° -1° (1902) 38° (1940) 0.07" NA
Aug 10 10° 27.8° 1° (1902) 38° (2003) 0.06" NA
Aug 11 10° 27.2° -1° (1896) 37° (1906) 0.06" NA
Aug 12 10° 27.2° -1° (1916) 38° (1940) 0.06" NA
Aug 13 10° 27.2° 2° (1912) 36° (1973) 0.06" NA
Aug 14 10° 27.2° 2° (1995) 38° (1929) 0.06" NA
Aug 15 10° 27.2° 1° (1943) 37° (1990) 0.06" NA
Aug 16 10° 27.2° 0° (1905) 37° (1973) 0.06" NA
Aug 17 9.4° 26.7° -1° (1910) 37° (1906) 0.06" NA
Aug 18 9.4° 26.7° 1° (1902) 36° (1964) 0.06" NA
Aug 19 9.4° 26.7° -1° (1907) 35° (1903) 0.06" NA
Aug 20 9.4° 26.7° 0° (1916) 36° (1931) 0.06" NA
Aug 21 9.4° 26.1° -2° (1904) 36° (1969) 0.06" NA
Aug 22 8.9° 26.1° 1° (1928) 37° (1976) 0.06" NA
Aug 23 8.9° 26.1° 1° (1992) 38° (1969) 0.06" NA
Aug 24 8.9° 25.6° -1° (1934) 38° (1969) 0.06" NA
Aug 25 8.9° 25.6° -3° (1910) 37° (1926) 0.06" NA
Aug 26 8.3° 25.6° -1° (1896) 37° (1926) 0.06" NA
Aug 27 8.3° 25° -1° (1900) 36° (1971) 0.06" NA
Aug 28 8.3° 25° 1° (1918) 38° (1924) 0.06" NA
Aug 29 7.8° 24.4° 0° (1902) 33.9° (2006) 0.06" NA
Aug 30 7.8° 24.4° -1° (1912) 36° (1929) 0.06" NA
Aug 31 7.8° 23.9° 1° (1930) 37° (1991) 0.06" NA
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