Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 32° -46° (1929) 73° (1981) 0.89" 11.1"
February 15° 36° -42° (1936) 70° (1932) 0.57" 6.4"
March 21° 43° -28° (1945) 88° (1902) 1.16" 11.6"
April 29° 53° -17° (1936) 89° (1939) 1.38" 8.1"
May 38° 63° 11° (1946) 98° (1931) 2.92" 4.7"
June 45° 72° 21° (1914) 105° (1900) 2.93" 0"
July 50° 79° 27° (1903) 105° (1900) 2.1" 0"
August 49° 80° 27° (1910) 103° (1961) 1.89" 0"
September 40° 69° 6° (1926) 99° (1909) 1.38" 1.3"
October 31° 57° -10° (1935) 92° (1905) 1.06" 4.5"
November 20° 42° -30° (1985) 81° (1908) 0.74" 7.2"
December 13° 34° -42° (1983) 74° (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 42° 67° 27° (1928) 86° (1977) 0.11" NA
Jun 2 42° 68° 30° (1916) 89° (1909) 0.11" NA
Jun 3 42° 68° 25° (1910) 89° (1988) 0.11" NA
Jun 4 42° 68° 27° (1930) 95° (1988) 0.11" NA
Jun 5 43° 68° 28° (1901) 91° (1988) 0.11" NA
Jun 6 43° 69° 29° (1901) 86° (1919) 0.1" NA
Jun 7 43° 69° 29° (1930) 92° (1988) 0.1" NA
Jun 8 43° 69° 29° (1924) 88° (1926) 0.1" NA
Jun 9 44° 70° 32° (1937) 92° (1918) 0.1" NA
Jun 10 44° 70° 29° (1928) 97° (1918) 0.1" NA
Jun 11 44° 70° 27° (1969) 95° (1918) 0.1" NA
Jun 12 44° 70° 29° (1969) 95° (1918) 0.1" NA
Jun 13 45° 71° 23° (1969) 93° (1918) 0.1" NA
Jun 14 45° 71° 27° (1969) 97° (1918) 0.1" NA
Jun 15 45° 71° 21° (1914) 96° (1933) 0.1" NA
Jun 16 45° 72° 31° (1902) 97° (1931) 0.1" NA
Jun 17 45° 72° 29° (1928) 92° (1930) 0.1" NA
Jun 18 46° 72° 30° (1981) 93° (1900) 0.1" NA
Jun 19 46° 72° 34° (1978) 92° (1900) 0.1" NA
Jun 20 46° 73° 27° (1929) 96° (1900) 0.1" NA
Jun 21 46° 73° 32° (1905) 105° (1900) 0.09" NA
Jun 22 46° 73° 33° (1942) 98° (1919) 0.09" NA
Jun 23 46° 74° 32° (1905) 97° (1936) 0.09" NA
Jun 24 47° 74° 33° (1905) 93° (1900) 0.09" NA
Jun 25 47° 74° 32° (1904) 93° (1910) 0.09" NA
Jun 26 47° 75° 33° (1989) 99° (1919) 0.09" NA
Jun 27 47° 75° 33° (1902) 99° (1936) 0.09" NA
Jun 28 47° 75° 32° (1911) 96° (1919) 0.09" NA
Jun 29 47° 76° 31° (1947) 96° (1984) 0.08" NA
Jun 30 48° 76° 35° (1988) 98° (1990) 0.08" NA
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