| Year | Season | Sales (USD) | | :--- | :--- | :--- | | Year 1 | Summer | $60,000 | | Year 1 | Fall | $20,000 | | Year 1 | Winter | $10,000 | | Year 1 | Spring | $30,000 | | Year 2 | Summer | $70,000 | | Year 2 | Fall | $25,000 | | Year 2 | Winter | $12,000 | | Year 2 | Spring | $35,000 |
"Now divide that total by 4 to get the 'average season' for next year," Leo said. how to calculate seasonal variation
She implemented the system. The following summer, she ordered 80 gallons of chocolate fudge instead of 40, and she didn't run out once. In winter, she launched a small hot cocoa and cookie menu (index 0.34 meant low volume, so she kept it simple). She stopped wasting money on full staff in January. | Year | Season | Sales (USD) |
But she was ready. Because Elena no longer fought the seasons—she measured them. Seasonal variation isn't guesswork. By calculating the Seasonal Index (Seasonal Average ÷ Overall Average) and applying it to a trend forecast, you can turn nature's unpredictability into a predictable business advantage. Whether you sell ice cream, umbrellas, or air conditioners, the numbers will always tell you the rhythm—if you're willing to listen. In winter, she launched a small hot cocoa