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
Jun 1 5.6° 19.4° -3° (1928) 30° (1977) 0.11" NA
Jun 2 5.6° 20° -1° (1916) 32° (1909) 0.11" NA
Jun 3 5.6° 20° -4° (1910) 32° (1988) 0.11" NA
Jun 4 5.6° 20° -3° (1930) 35° (1988) 0.11" NA
Jun 5 6.1° 20° -2° (1901) 33° (1988) 0.11" NA
Jun 6 6.1° 20.6° -2° (1901) 30° (1919) 0.1" NA
Jun 7 6.1° 20.6° -2° (1930) 33° (1988) 0.1" NA
Jun 8 6.1° 20.6° -2° (1924) 31° (1926) 0.1" NA
Jun 9 6.7° 21.1° 0° (1937) 33° (1918) 0.1" NA
Jun 10 6.7° 21.1° -2° (1928) 36° (1918) 0.1" NA
Jun 11 6.7° 21.1° -3° (1969) 35° (1918) 0.1" NA
Jun 12 6.7° 21.1° -2° (1969) 35° (1918) 0.1" NA
Jun 13 7.2° 21.7° -5° (1969) 34° (1918) 0.1" NA
Jun 14 7.2° 21.7° -3° (1969) 36° (1918) 0.1" NA
Jun 15 7.2° 21.7° -6° (1914) 36° (1933) 0.1" NA
Jun 16 7.2° 22.2° -1° (1902) 36° (1931) 0.1" NA
Jun 17 7.2° 22.2° -2° (1928) 33° (1930) 0.1" NA
Jun 18 7.8° 22.2° -1° (1981) 34° (1900) 0.1" NA
Jun 19 7.8° 22.2° 1° (1978) 33° (1900) 0.1" NA
Jun 20 7.8° 22.8° -3° (1929) 36° (1900) 0.1" NA
Jun 21 7.8° 22.8° 0° (1905) 41° (1900) 0.09" NA
Jun 22 7.8° 22.8° 1° (1942) 37° (1919) 0.09" NA
Jun 23 7.8° 23.3° 0° (1905) 36° (1936) 0.09" NA
Jun 24 8.3° 23.3° 1° (1905) 34° (1900) 0.09" NA
Jun 25 8.3° 23.3° 0° (1904) 34° (1910) 0.09" NA
Jun 26 8.3° 23.9° 1° (1989) 37° (1919) 0.09" NA
Jun 27 8.3° 23.9° 1° (1902) 37° (1936) 0.09" NA
Jun 28 8.3° 23.9° 0° (1911) 36° (1919) 0.09" NA
Jun 29 8.3° 24.4° -1° (1947) 36° (1984) 0.08" NA
Jun 30 8.9° 24.4° 2° (1988) 37° (1990) 0.08" NA
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