Temperature Breakdown by Decade

Detroit Area Average Monthly Temperatures from 1900 to 1920
Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Avg for Year
1900	28.3	21.3	26.3	48.3	60.0	66.6	72.0	75.5	66.9	60.1	38.7	29.3	49.4
1901	25.1	16.4	33.2	47.7	56.6	68.9	76.8	71.9	64.8	52.9	36.4	25.4	48.0
1902	24.7	22.6	39.3	47.2	58.5	63.9	72.9	68.0	62.2	52.4	46.9	27.0	48.8
1903	24.1	25.6	41.4	46.9	60.8	62.8	72.6	67.4	64.1	53.1	36.5	22.5	48.2
1904	17.6	16.1	33.1	41.2	59.2	67.0	71.2	68.2	63.7	50.5	40.1	25.8	46.1
1905	20.4	17.9	37.5	44.4	57.5	67.2	71.4	71.4	65.4	52.1	37.5	32.0	47.9
1906	33.6	25.6	28.2	49.2	57.5	67.9	71.5	74.5	68.4	51.0	39.6	29.0	49.7
1907	26.0	21.2	39.2	39.1	51.1	64.8	71.0	68.0	62.8	47.3	38.2	30.5	46.6
1908	25.9	21.8	36.1	45.4	59.2	68.2	72.8	69.7	68.7	53.8	40.3	29.8	49.3
1909	28.6	29.2	32.9	43.4	55.7	67.1	71.2	71.5	61.4	47.3	44.9	23.0	48.0
1910	25.1	22.4	44.1	49.0	53.9	66.5	73.9	70.6	63.3	54.6	35.7	23.3	48.5
1911	27.4	28.8	33.7	46.0	64.7	69.5	73.6	70.7	64.5	50.9	35.6	33.9	49.9
1912	13.1	18.3	26.4	46.2	59.2	65.0	71.2	67.4	65.4	53.7	40.4	32.0	46.5
1913	30.3	21.4	33.8	47.4	57.4	69.0	72.9	72.0	62.3	53.2	43.6	34.3	49.8
1914	29.4	17.6	33.1	44.9	60.8	68.0	72.7	71.4	62.8	56.6	39.7	23.9	48.4
1915	23.4	29.9	31.9	52.2	53.1	63.1	70.4	66.0	65.0	53.5	42.3	27.9	48.2
1916	30.1	21.6	28.7	46.8	57.8	63.5	77.9	74.6	63.1	52.9	40.5	26.9	48.7
1917	24.0	19.5	36.3	43.6	51.4	64.1	72.2	69.9	61.2	44.9	38.5	21.9	45.6
1918	13.2	24.5	39.6	44.6	62.4	66.6	71.1	74.8	57.4	55.6	42.3	36.4	49.0
1919	31.1	29.4	36.3	46.0	56.6	74.0	75.0	70.2	66.8	56.5	38.6	23.2	50.3
1920	16.9	22.7	37.7	41.0	56.5	69.1	69.7	69.5	65.7	59.5	39.1	32.8	48.4