Temperature Breakdown by Decade

Detroit Area Average Monthly Temperatures from 1940 to 1960
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Avg for Year
1940	19.0	26.7	28.7	42.8	55.7	67.6	73.4	70.5	62.8	52.2	38.0	32.1	47.5
1941	26.3	25.3	30.5	52.6	62.4	70.0	74.4	71.0	67.6	55.3	43.0	35.6	51.2
1942	25.8	22.7	38.5	52.9	59.5	69.0	73.6	70.6	62.6	53.4	41.2	25.6	49.6
1943	21.7	28.0	33.8	42.4	56.6	72.8	73.5	72.2	61.2	50.7	38.2	27.5	48.2
1944	30.8	28.6	31.2	42.9	63.3	71.5	73.6	74.4	65.6	52.8	42.6	24.8	50.2
1945	17.9	27.8	47.9	50.1	52.6	65.3	70.8	71.5	64.7	51.0	41.8	24.4	48.8
1946	28.1	26.6	46.1	47.8	56.6	67.4	73.3	68.4	65.2	58.2	43.9	32.2	51.2
1947	29.3	22.5	30.9	44.7	53.8	66.0	70.9	76.5	65.4	60.3	37.2	29.0	48.9
1948	19.6	24.4	34.9	51.3	55.5	67.3	73.7	72.1	66.1	50.1	45.7	31.7	49.4
1949	31.6	30.7	35.7	47.3	60.4	73.3	76.2	71.9	59.7	57.4	39.0	33.0	51.4
1950	32.6	26.5	30.2	41.5	58.3	68.2	71.1	70.2	63.1	56.4	36.7	25.4	48.4
1951	27.8	27.7	36.5	46.0	59.9	67.8	72.7	69.5	62.5	55.4	34.6	28.4	49.1
1952	29.3	29.3	34.3	49.6	57.3	72.7	76.5	71.5	64.8	48.1	42.8	34.1	50.9
1953	30.6	32.2	37.9	44.5	59.5	70.9	73.5	74.3	64.7	56.8	44.5	33.7	51.9
1954	26.1	33.5	33.5	50.2	54.7	71.3	71.8	70.3	65.6	54.5	41.2	29.7	50.2
1955	26.3	28.4	35.7	54.5	61.9	68.5	79.1	75.7	65.7	55.3	37.7	27.3	51.3
1956	26.4	28.1	32.4	45.7	56.0	69.8	71.8	71.2	60.4	57.5	40.9	34.9	49.6
1957	21.1	30.6	36.9	49.1	56.4	68.7	72.8	70.2	62.9	50.8	41.0	34.1	49.5
1958	26.6	22.8	36.4	49.6	58.4	63.9	72.4	71.0	63.8	55.0	42.9	22.4	48.8
1959	21.3	25.7	34.3	48.6	62.2	70.1	74.1	76.3	67.0	51.9	36.6	34.7	50.2
1960	29.0	27.5	26.3	50.6	58.4	66.9	70.8	71.9	66.9	53.2	43.6	25.2	49.2