Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January -11° -43.3° (1929) 22.8° (1981) 0.57" 9.8"
February -9° -41.1° (1936) 21.1° (1932) 0.46" 5.3"
March -6° -33.3° (1945) 31.1° (1902) 0.99" 12"
April -2° 12° -27.2° (1936) 31.7° (1939) 1.41" 8.1"
May 17° -11.7° (1946) 36.7° (1931) 2.85" 4.8"
June 22° -6.1° (1914) 40.6° (1900) 3.08" 0.1"
July 10° 27° -2.8° (1903) 40.6° (1900) 1.93" 0"
August 10° 27° -2.8° (1910) 39.4° (1961) 1.73" 0"
September 21° -14.4° (1926) 37.2° (1909) 1.35" 1.6"
October -1° 14° -23.3° (1935) 33.3° (1905) 1.13" 3.9"
November -6° -34.4° (1985) 27.2° (1908) 0.71" 7.5"
December -11° -41.1° (1983) 23.3° (1939) 0.66" 9.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Jul 1 25° 1° (1901) 35° (1990) 0.07" 0"
Jul 2 25° 1° (1915) 39° (1908) 0.08" 0"
Jul 3 25° 1° (1972) 36° (1936) 0.07" 0"
Jul 4 25° 0° (1915) 37° (1937) 0.08" 0"
Jul 5 25° 2° (1901) 37° (1936) 0.07" 0"
Jul 6 26° 3° (1902) 36.7° (2007) 0.07" 0"
Jul 7 10° 26° 2° (1971) 34° (1900) 0.07" 0"
Jul 8 10° 26° 2° (1903) 37° (1930) 0.07" 0"
Jul 9 10° 26° -3° (1903) 36° (1930) 0.07" 0"
Jul 10 10° 26° 4° (1902) 38° (1939) 0.06" 0"
Jul 11 10° 27° 1° (1951) 37° (1925) 0.07" 0"
Jul 12 10° 27° 2° (2008) 37° (2002) 0.07" 0"
Jul 13 10° 27° 3° (1909) 38° (2002) 0.07" 0"
Jul 14 10° 27° 2° (1913) 38° (2002) 0.06" 0"
Jul 15 10° 27° 2° (1913) 37° (1930) 0.06" 0"
Jul 16 10° 27° 1° (1999) 37° (1919) 0.07" 0"
Jul 17 10° 27° 3° (1982) 37° (1910) 0.06" 0"
Jul 18 11° 28° 2° (1900) 38° (1955) 0.05" 0"
Jul 19 11° 28° 2° (1897) 37° (1960) 0.06" 0"
Jul 20 11° 28° 2° (1900) 36° (1921) 0.06" 0"
Jul 21 11° 28° 1° (1926) 38° (1931) 0.06" 0"
Jul 22 11° 28° 3° (1914) 37° (1936) 0.06" 0"
Jul 23 11° 28° 2° (1896) 40° (1931) 0.05" 0"
Jul 24 11° 28° 1° (1896) 38° (1929) 0.05" 0"
Jul 25 11° 28° 3° (1948) 38° (1933) 0.06" 0"
Jul 26 11° 28° 3° (2005) 36° (1933) 0.05" 0"
Jul 27 11° 28° 3° (1913) 38° (1947) 0.05" 0"
Jul 28 11° 28° 2° (1929) 37° (1914) 0.05" 0"
Jul 29 11° 28° 2° (1904) 37° (1929) 0.06" 0"
Jul 30 11° 28° 0° (1904) 39° (1908) 0.05" 0"
Jul 31 11° 28° 2° (1968) 41° (1900) 0.05" 0"
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