Helena, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 19° 36° -24° (1994) 75° (1943) 2.84" NA
February 23° 42° -25° (1951) 78° (1972) 2.73" NA
March 32° 54° -15° (1978) 89° (1910) 4.35" NA
April 42° 65° 21° (1994) 91° (1930) 4.38" NA
May 52° 75° 29° (1971) 98° (1911) 4.76" NA
June 62° 84° 36° (1917) 106° (1954) 4.07" NA
July 66° 88° 45° (1937) 112° (1936) 4.13" NA
August 63° 86° 41° (1964) 109° (1943) 3.55" NA
September 55° 80° 27° (1928) 106° (1953) 3.09" NA
October 44° 69° 17° (1952) 97° (1953) 3.34" NA
November 34° 54° -2° (1929) 89° (1923) 4.39" NA
December 24° 41° -19° (1989) 74° (1982) 3.65" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 47° 70° 29° (1963) 90° (1951) 0.15" NA
May 2 47° 70° 32° (1978) 90° (1959) 0.15" NA
May 3 47° 71° 32° (1967) 90° (1902) 0.15" NA
May 4 48° 71° 29° (1971) 91° (1959) 0.15" NA
May 5 48° 71° 34° (1917) 93° (1959) 0.15" NA
May 6 48° 72° 32° (1944) 92° (1949) 0.15" NA
May 7 49° 72° 31° (1944) 90° (1936) 0.15" NA
May 8 49° 72° 34° (1928) 90° (1930) 0.16" NA
May 9 49° 73° 31° (1947) 91° (1934) 0.16" NA
May 10 50° 73° 30° (1966) 91° (1928) 0.16" NA
May 11 50° 73° 32° (1907) 90° (1916) 0.16" NA
May 12 50° 73° 32° (1981) 92° (1902) 0.16" NA
May 13 51° 74° 35° (1960) 89° (1902) 0.16" NA
May 14 51° 74° 34° (1910) 90° (1962) 0.16" NA
May 15 51° 74° 34° (1920) 90° (1916) 0.16" NA
May 16 52° 75° 35° (1997) 91° (1944) 0.16" NA
May 17 52° 75° 36° (1973) 92° (1962) 0.16" NA
May 18 52° 75° 36° (2002) 92° (1962) 0.16" NA
May 19 53° 76° 36° (2002) 91° (1911) 0.15" NA
May 20 53° 76° 36° (2002) 96° (1902) 0.15" NA
May 21 53° 77° 35° (1954) 94° (1941) 0.15" NA
May 22 54° 77° 37° (1924) 95° (1902) 0.15" NA
May 23 54° 77° 37° (1926) 93° (1921) 0.15" NA
May 24 55° 78° 41° (1917) 94° (1939) 0.15" NA
May 25 55° 78° 33° (1925) 96° (1926) 0.15" NA
May 26 55° 78° 34° (1979) 97° (1911) 0.15" NA
May 27 56° 79° 33° (1961) 98° (1911) 0.15" NA
May 28 56° 79° 38° (1907) 98° (1911) 0.15" NA
May 29 57° 79° 38° (1964) 98° (1911) 0.15" NA
May 30 57° 80° 38° (1947) 96° (1937) 0.15" NA
May 31 57° 80° 36° (1930) 96° (1934) 0.15" NA
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