Lewistown, Montana
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 13° 34° -46° (1929) 73° (1981) 0.57" 9.8"
February 15° 37° -42° (1936) 70° (1932) 0.46" 5.3"
March 22° 44° -28° (1945) 88° (1902) 0.99" 12"
April 29° 54° -17° (1936) 89° (1939) 1.41" 8.1"
May 38° 63° 11° (1946) 98° (1931) 2.85" 4.8"
June 45° 71° 21° (1914) 105° (1900) 3.08" 0.1"
July 50° 81° 27° (1903) 105° (1900) 1.93" 0"
August 50° 81° 27° (1910) 103° (1961) 1.73" 0"
September 41° 69° 6° (1926) 99° (1909) 1.35" 1.6"
October 31° 57° -10° (1935) 92° (1905) 1.13" 3.9"
November 21° 43° -30° (1985) 81° (1908) 0.71" 7.5"
December 13° 34° -42° (1983) 74° (1939) 0.66" 9.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 33° 58° 19° (1969) 82° (2000) 0.06" 0.2"
May 2 33° 59° 17° (2005) 86° (1985) 0.07" 0.2"
May 3 33° 59° 17° (1967) 82° (1918) 0.07" 0.2"
May 4 34° 59° 16° (1967) 84° (1918) 0.07" 0.2"
May 5 34° 60° 21° (1913) 85° (1934) 0.06" 0.2"
May 6 34° 60° 11° (1929) 85° (1928) 0.07" 0.2"
May 7 35° 60° 23° (1929) 89° (1908) 0.08" 0.2"
May 8 35° 60° 19° (1929) 85° (1928) 0.08" 0.2"
May 9 35° 61° 16° (2002) 84° (1906) 0.08" 0.2"
May 10 36° 61° 11° (1946) 88° (1906) 0.08" 0.1"
May 11 36° 61° 21° (1968) 86° (1993) 0.08" 0.2"
May 12 36° 62° 19° (1916) 88° (2001) 0.09" 0.1"
May 13 37° 62° 15° (1953) 88° (1903) 0.08" 0.1"
May 14 37° 62° 25° (1916) 98° (1931) 0.09" 0.2"
May 15 37° 62° 12° (1910) 87° (1931) 0.1" 0.2"
May 16 38° 63° 26° (1896) 87° (1901) 0.09" 0.1"
May 17 38° 63° 27° (1916) 87° (1948) 0.1" 0.2"
May 18 38° 63° 23° (1929) 86° (1937) 0.1" 0.2"
May 19 39° 63° 25° (1903) 86° (1992) 0.1" 0.2"
May 20 39° 64° 23° (1931) 88° (1925) 0.1" 0.2"
May 21 39° 64° 24° (1931) 89° (1928) 0.1" 0.1"
May 22 40° 64° 24° (1910) 93° (1928) 0.1" 0.2"
May 23 40° 64° 17° (1930) 96° (1926) 0.1" 0.2"
May 24 40° 65° 29° (1993) 88° (1929) 0.11" 0.1"
May 25 40° 65° 26° (2004) 92° (1928) 0.11" 0.1"
May 26 41° 65° 26° (1975) 90° (1936) 0.1" 0.1"
May 27 41° 65° 23° (1910) 91° (1919) 0.11" 0.1"
May 28 41° 66° 15° (1947) 93° (1919) 0.12" 0.1"
May 29 42° 66° 27° (1929) 92° (1936) 0.11" 0.1"
May 30 42° 66° 30° (1924) 92° (1936) 0.12" 0"
May 31 42° 66° 24° (1982) 87° (1936) 0.12" 0.1"
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