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
May 1 1.1° 14.4° -7° (1969) 28° (2000) 0.07" NA
May 2 1.1° 15° -8° (2005) 30° (1985) 0.07" NA
May 3 1.1° 15° -8° (1967) 28° (1918) 0.07" NA
May 4 1.1° 15° -9° (1967) 29° (1918) 0.08" NA
May 5 1.7° 15° -6° (1913) 29° (1934) 0.08" NA
May 6 1.7° 15.6° -12° (1929) 29° (1928) 0.08" NA
May 7 1.7° 15.6° -5° (1929) 32° (1908) 0.08" NA
May 8 1.7° 15.6° -7° (1929) 29° (1928) 0.09" NA
May 9 2.2° 16.1° -9° (2002) 29° (1906) 0.09" NA
May 10 2.2° 16.1° -12° (1946) 31° (1906) 0.09" NA
May 11 2.2° 16.1° -6° (1968) 30° (1993) 0.09" NA
May 12 2.8° 16.1° -7° (1916) 31° (2001) 0.09" NA
May 13 2.8° 16.7° -5° (1943) 31° (1903) 0.09" NA
May 14 2.8° 16.7° -4° (1916) 37° (1931) 0.09" NA
May 15 2.8° 16.7° -11° (1910) 31° (1931) 0.1" NA
May 16 3.3° 17.2° -3° (1896) 31° (1901) 0.1" NA
May 17 3.3° 17.2° -3° (1916) 31° (1948) 0.1" NA
May 18 3.3° 17.2° -5° (1929) 30° (1937) 0.1" NA
May 19 3.3° 17.2° -4° (1903) 30° (1992) 0.1" NA
May 20 3.9° 17.8° -5° (1931) 31° (1925) 0.1" NA
May 21 3.9° 17.8° -4° (1931) 32° (1928) 0.1" NA
May 22 3.9° 17.8° -4° (1910) 34° (1928) 0.1" NA
May 23 3.9° 18.3° -8° (1930) 36° (1926) 0.1" NA
May 24 4.4° 18.3° -2° (1993) 31° (1929) 0.1" NA
May 25 4.4° 18.3° -3° (2004) 33° (1928) 0.1" NA
May 26 4.4° 18.9° -3° (1975) 32° (1936) 0.11" NA
May 27 18.9° -5° (1910) 33° (1919) 0.11" NA
May 28 18.9° -9° (1947) 34° (1919) 0.11" NA
May 29 18.9° -3° (1929) 33° (1936) 0.11" NA
May 30 19.4° -1° (1924) 33° (1936) 0.11" NA
May 31 5.6° 19.4° -4° (1982) 31° (1936) 0.11" NA
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