 All right, this is an interesting problem. Given the following temperatures by month for state college, we need to calculate the heating degree days for the entire season. For January, the outside temperature is 25 degrees Fahrenheit. This is average temperature for 31 days in January. And February, the outside temperature is 28 degrees Fahrenheit. March, 37 degrees Fahrenheit. And April, it is 48 degrees Fahrenheit. And May, the temperature outside is 59 degrees Fahrenheit. June, the outside temperature is 67. July, the outside temperature is 71. And August, it is 70. September, it goes on like that. September is 62 degrees Fahrenheit. And October, it is 51. November, 41. December, it goes as 31 degrees Fahrenheit. What we need to do is basically subtract this number from 65. So the difference is 65 minus 25. So this is 40 degrees Fahrenheit for the month of January. The same case here, 65 minus 28, which happens to be 37 degrees Fahrenheit. And if we do the same for all these months from March through December, and then we have to multiply each month temperature difference by the number of days in the month. For example, in the case of January, there are 31 days. So when you multiply 40 degrees by 31 days, you get 1,240 degree days. Similarly, we can do for all these months and add up. And it turns out that for the entire year, it is 61,38 degree days is for state college.