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
Mar 1 -7.8° 3.9° -28° (1919) 19° (1905) 0.03" NA
Mar 2 -7.8° 3.9° -31° (1976) 22° (1905) 0.03" NA
Mar 3 -7.8° 3.9° -33° (1896) 22° (1921) 0.03" NA
Mar 4 -7.8° 4.4° -32° (1945) 21° (1987) 0.03" NA
Mar 5 -7.2° 4.4° -33° (1945) 21° (1987) 0.03" NA
Mar 6 -7.2° 4.4° -32° (1920) 21° (1902) 0.03" NA
Mar 7 -7.2° 4.4° -27° (1897) 23° (1902) 0.03" NA
Mar 8 -7.2° -29° (1932) 17° (1902) 0.03" NA
Mar 9 -6.7° -30° (1932) 22° (1902) 0.04" NA
Mar 10 -6.7° -30° (1948) 26° (1902) 0.04" NA
Mar 11 -6.7° -29° (1932) 23° (1902) 0.04" NA
Mar 12 -6.7° 5.6° -29° (1897) 23° (1902) 0.04" NA
Mar 13 -6.1° 5.6° -32° (1897) 25° (1902) 0.04" NA
Mar 14 -6.1° 5.6° -27° (1967) 25° (1902) 0.04" NA
Mar 15 -6.1° 5.6° -32° (1906) 22° (1902) 0.04" NA
Mar 16 -6.1° 6.1° -28° (1943) 21° (1910) 0.04" NA
Mar 17 -6.1° 6.1° -28° (1943) 20° (2007) 0.04" NA
Mar 18 -5.6° 6.1° -27° (1913) 21° (1972) 0.04" NA
Mar 19 -5.6° 6.7° -29° (1913) 19° (1910) 0.04" NA
Mar 20 -5.6° 6.7° -24° (1913) 25° (1910) 0.04" NA
Mar 21 -5.6° 6.7° -29° (2002) 24° (1928) 0.04" NA
Mar 22 -5° 6.7° -28° (1898) 24° (1928) 0.04" NA
Mar 23 -5° 7.2° -29° (1913) 23° (1939) 0.04" NA
Mar 24 -5° 7.2° -33° (1965) 22° (1939) 0.04" NA
Mar 25 -5° 7.8° -29° (1996) 23° (1999) 0.04" NA
Mar 26 -4.4° 7.8° -25° (1904) 27° (1902) 0.04" NA
Mar 27 -4.4° 7.8° -23° (1965) 23° (1902) 0.04" NA
Mar 28 -4.4° 8.3° -24° (1987) 29° (1902) 0.04" NA
Mar 29 -3.9° 8.3° -27° (1987) 31° (1902) 0.04" NA
Mar 30 -3.9° 8.3° -29° (1936) 24° (2004) 0.04" NA
Mar 31 -3.9° 8.9° -24° (1936) 22° (1906) 0.04" NA
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