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Month Avg Max Avg Min Highest Lowest Avg Delta T 70 Delta T 40 Use if <0 Oct 60 40 90 25 50 20 -10 0 Nov. 50 32 68 14 41 29 -1 0 Dec. 36 22 66 -14 29 41 11 Jan. 32 15 65 -27 23.5 46.5 16.5 Feb. 41 25 70 -5 33 37 7 Mar/ 48 28 77 15 38 32 2 Apr. 62 41 30 80 51.5 18.5 -11.5 0 Heating degree days Month Days DD70 DD40 Oct 31 620 0 Nov. 30 870 0 Dec. 31 1271 341 Jan. 31 1441.5 511.5 Feb. 28 1036 196 Mar/ 31 992 62 Apr. 30 555 0 Seasonal Total Deg Days 6785.5 1110.5 Proportion of DD40 to DD70 0.1636578 Heading Definition Avg Max The average of the daily maximum temperatures for the month Avg Min The average of the daily minimum temperatures for the month Highest The highest temperature ever recorded during the month - not used Lowest The lowest temperature ever recorded during the month - not used Avg The average of the daily maximum and minimum temperatures for the month Delta T 70 The difference between the average daily temperature and an interior temperature of 70 deg F Delta T 40 The difference between the average daily temperature and an interior temperature of 40 deg F Use if <0 If the average daily temperature is above 40 deg F, use 0 instead Heating Days The product of the temperature difference and the number of days in the month, the standard way of estimating energy requirements DD70 The product of the temperature difference and the number of days in the month relative to 70 deg F DD40 The product of the temperature difference and the number of days in the month relative to 40 deg F Seasonal Total The total calculated degree days in a heating season (National Weather Service data for Dayton OH =5675 base 65) Proportion The ratio of the energy requirements to heat to 40 deg F versus that required to heat to 70 deg F
