function updateAverage(averageAsOfYesterday, todayTemp, todayDayOfYear) { yesterdayDayOfYear = todayDayOfYear - 1 sumOfAllTempsUpToAndIncludingYeste

function updateAverage(averageAsOfYesterday, todayTemp, todayDayOfYear) { yesterdayDayOfYear = todayDayOfYear - 1 sumOfAllTempsUpToAndIncludingYesterday = yesterdayDayOfYear * averageAsOfYesterday return (sumOfAllTempsUpToAndIncludingYesterday + todayTemp) / todayDayOfYear }