Monthly Temperature Data
Grand Rapids, Michigan
(July 1977 through June 1987)

Month/Year

Actual temperature

Normal temperature

Deviation from normal

July 1977 74 71.5 2.5
Aug. 1977 67.9 70 -2.1
Sept. 1977 62.9 62.4 0.5
Oct. 1977 48.6 52 -3.4
Nov. 1977 39.5 38.7 0.8
Dec. 1977 25.9 27.4 -1.5
Jan. 1978 19.3 23.2 -3.9
Feb. 1978 14.4 24.5 -10.1
Mar. 1978 27.9 33.1 -5.2
April 1978 45.3 46.5 -1.2
May 1978 59.9 57.1 2.8
June 1978 66.8 67.4 -0.6
July 1978 70.4 71.5 -1.1
Aug. 1978 68.1 70 -1.9
Sept. 1978 63.7 62.4 1.3
Oct. 1978 47.2 52 -4.8
Nov. 1978 37.6 38.7 -1.1
Dec. 1978 26.6 27.4 -0.8
Jan. 1979 17.1 23.2 -6.1
Feb. 1979 15 24.5 -9.5
Mar. 1979 36.9 33.1 3.8
April 1979 44.5 46.5 -2
May 1979 57.7 57.1 0.6
June 1979 67.6 67.4 0.2
July 1979 71.1 71.5 -0.4
Aug. 1979 68.5 70 -1.5
Sept. 1979 63.4 62.4 1
Oct. 1979 51.5 52 -0.5
Nov. 1979 40.5 38.7 1.8
Dec. 1979 33 27.4 5.6
Jan. 1980 25.1 23.2 1.9
Feb. 1980 22.7 24.5 -1.8
Mar. 1980 32.5 33.1 -0.6
April 1980 47 46.5 0.5
May 1980 59.9 57.1 2.8
June 1980 64.4 67.4 -3
July 1980 72.7 71.5 1.2
Aug. 1980 72.6 70 2.6
Sept. 1980 62.7 62.4 0.3
Oct. 1980 45.8 52 -6.2
Nov. 1980 37.5 38.7 -1.2
Dec. 1980 25.1 27.4 -2.3
Jan. 1981 20.8 23.2 -2.4
Feb. 1981 30.2 24.5 5.7
Mar. 1981 35.1 33.1 2
April 1981 47.3 46.5 0.8
May 1981 55.5 57.1 -1.6
June 1981 68.6 67.4 1.2
July 1981 72.1 71.5 0.6
Aug. 1981 70.7 70 0.7
Sept. 1981 60.9 62.4 -1.5
Oct. 1981 48.2 52 -3.8
Nov. 1981 39.8 38.7 1.1
Dec. 1981 28.7 27.4 1.3
Jan. 1982 17.2 23.2 -6
Feb. 1982 22.1 24.5 -2.4
Mar. 1982 32.5 33.1 -0.6
April 1982 41.8 46.5 -4.7
May 1982 65 57.1 7.9
June 1982 62.8 67.4 -4.6
July 1982 73.1 71.5 1.6
Aug. 1982 68.6 70 -1.4
Sept. 1982 61.9 62.4 -0.5
Oct. 1982 53.6 52 1.6
Nov. 1982 40.8 38.7 2.1
Dec. 1982 36.2 27.4 8.8
Jan. 1983 27.6 22 5.6
Feb. 1983 30.9 23.7 7.2
Mar. 1983 36.9 33.1 3.8
April 1983 42.6 46.3 -3.7
May 1983 52.8 57.5 -4.7
June 1983 67.7 67.1 0.6
July 1983 74.7 71.4 3.3
Aug. 1983 72.2 69.6 2.6
Sept. 1983 62.4 62.1 0.3
Oct. 1983 50.7 50.9 -0.2
Nov. 1983 40.7 38.5 2.2
Dec. 1983 19.2 27.3 -8.1
Jan. 1984 17.1 22 -4.9
Feb. 1984 34 23.7 10.3
Mar. 1984 28.9 33.1 -4.2
April 1984 47.3 46.3 1
May 1984 53.5 57.5 -4
June 1984 70.1 67.1 3
July 1984 70.1 71.4 -1.3
Aug. 1984 73 69.6 3.4
Sept. 1984 60.5 62.1 -1.6
Oct. 1984 54.2 50.9 3.3
Nov. 1984 40.3 38.5 1.8
Dec. 1984 32.2 27.3 4.9
Jan. 1985 18.6 22 -3.4
Feb. 1985 21.3 23.7 -2.4
Mar. 1985 36.2 33.1 3.1
April 1985 51.7 46.3 5.4
May 1985 60.4 57.5 2.9
June 1985 63.8 67.1 -3.3
July 1985 70.7 71.4 -0.7
Aug. 1985 67.4 69.6 -2.2
Sept. 1985 63.6 62.1 1.5
Oct. 1985 50.6 50.9 -0.3
Nov. 1985 38.4 38.5 -0.1
Dec. 1985 22.3 27.3 -5
Jan. 1986 22.7 22 0.7
Feb. 1986 22.5 23.7 -1.2
Mar. 1986 36.7 33.1 3.6
April 1986 49.7 46.3 3.4
May 1986 58.8 57.5 1.3
June 1986 64.4 67.1 -2.7
July 1986 72.5 71.4 1.1
Aug. 1986 66 69.6 -3.6
Sept. 1986 62.8 62.1 0.7
Oct. 1986 50.2 50.9 -0.7
Nov. 1986 35 38.5 -3.5
Dec. 1986 29.8 27.3 2.5
Jan. 1987 25.4 22 3.4
Feb. 1987 29.9 23.7 6.2
Mar. 1987 37.3 33.1 4.2
April 1987 50.1 46.3 3.8
May 1987 62.6 57.5 5.1
June 1987 71.2 67.1 4.1