Temperature Breakdown by Decade

Detroit Area Average Monthly Temperatures from 1980 to 2000
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Avg for Year
1980	24.5	22.2	31.3	45.9	59.8	63.7	72.7	72.7	63.8	46.3	37.4	26.0	47.2
1981	19.0	28.8	36.5	49.8	55.9	68.0	72.4	70.0	60.9	47.6	41.1	27.8	48.2
1982	17.1	20.7	33.0	43.2	64.3	64.2	72.4	67.7	61.8	52.6	41.6	37.3	48.0
1983	28.7	31.6	38.4	44.2	54.4	68.2	74.5	73.6	64.0	51.6	41.2	20.8	49.3
1984	18.0	33.3	28.9	47.8	54.5	70.8	70.7	72.7	61.2	54.9	38.6	34.0	48.8
1985	20.3	23.4	38.4	51.0	60.1	62.8	71.3	69.2	64.3	53.0	42.4	22.2	48.2
1986	23.9	24.6	37.6	50.6	61.3	67.3	75.0	68.9	65.9	52.6	37.3	31.7	49.7
1987	26.1	29.6	39.8	50.8	63.3	71.3	76.1	71.6	64.6	46.6	43.5	33.6	51.4
1988	23.8	23.4	36.9	48.5	62.0	70.4	77.1	75.1	63.3	46.0	42.2	28.7	49.8
1989	32.8	24.1	35.2	45.1	57.5	67.5	73.0	69.9	61.9	52.1	38.2	18.0	47.9
1990	33.6	30.7	39.5	49.0	56.6	68.5	72.2	71.2	64.5	52.8	44.2	32.8	51.3
1991	25.0	31.2	40.3	52.0	66.5	72.4	74.9	73.4	63.1	54.8	38.5	32.1	52.0
1992	28.3	30.8	35.5	46.3	58.3	65.5	68.8	66.7	61.4	49.7	40.5	33.2	48.8
1993	29.4	24.2	34.7	47.8	60.2	67.5	75.5	74.5	61.0	51.9	41.2	30.8	49.9
1994	17.3	23.5	37.1	51.2	58.7	72.3	74.2	69.6	66.2	53.8	45.5	35.4	50.4
1995	28.4	24.9	39.2	45.7	59.7	71.6	74.8	77.1	62.8	55.1	35.5	25.6	50.0
1996	24.3	26.0	30.8	45.2	56.7	70.7	70.6	72.9	64.1	52.0	34.1	31.5	48.2
1997	23.0	30.6	37.2	45.8	52.0	69.5	72.2	68.1	62.7	51.8	37.1	32.3	48.5
1998	32.8	36.7	39.5	50.4	65.6	69.1	73.4	73.2	68.0	53.8	43.8	35.3	53.5
1999	23.1	32.7	34.8	50.7	62.4	70.8	76.8	70.2	65.5	51.6	45.2	32.0	51.3
2000	24.6	31.9	44.0	48.0	61.8	69.4	70.3	70.8	62.5	55.1	40.2	19.3	49.8