How The Old Farmer's Almanac Predicts the Weather | The Old Farmer's Almanac

How The Old Farmer's Almanac Predicts The Weather

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How The Old Farmer's Almanac Makes Long Range Predictions

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Every year, folks ask us … “How does The Old Farmer’s Almanac predict the weather?” As America’s oldest weather forecaster, we specialize in predicting long-range weather, using a unique, age-old formula that’s traditionally 80% accurate. 

Some think our forecasts are derived from folklore. According to weather lore, a long, hard winter can be predicted by lots of acorns, tough apple skins, and thick corn husks, while a mild one can be predicted by lower bees nests and thin onion skins. Have you ever looked inside a persimmon seed? It may give you clues, too!

While we can neither confirm nor deny the reliability of this folklore, we do know that, centuries ago, folks observed such phenomena and noticed corresponding, repeating weather patterns … so at The Old Farmer’s Almanac, we allow that there just might be some truth to it! However, folklore does not figure into the creation of weather forecasts in our annual almanac.

We’ve Predicted the Weather Since George Washington Was President

Our weather forecast methodology stems from a secret formula that was devised by our founder, Robert B. Thomas, in 1792, when George Washington was president. And believe it or not, it has nothing to do acorns, apples, wooly bear caterpillars, or persimmons!

Thomas believed that weather on Earth was influenced by sunspots, which are magnetic storms on the surface of the Sun. Notes about his formula are locked in a black box in our offices in Dublin, New Hampshire.

Enjoy this humorous interview with Almanac Editor-in-Chief Jud Hale who shares the legend of the black box.


3 Disciplines in Long-Range Predictions

Over the years, we have refined and enhanced that formula with state-of-the-art technology and modern scientific calculations. We employ three scientific disciplines to make our long-range predictions:

  • solar science, the study of sunspots and other solar activity;
  • climatology, the study of prevailing weather patterns; and
  • meteorology, the study of the atmosphere.

We predict weather trends and events by comparing solar patterns and historical weather conditions with current solar activity.

Although neither we nor any other forecasters have as yet gained sufficient insight into the mysteries of the universe to predict the weather with total accuracy, our results are often very close to our traditional claim of 80 percent.


What Is “Normal” Weather?

When you read the weather predictions in this Almanac (or listen to any TV or radio forecast), you may notice the terms “normal” or “average” used to compare current traditions.

Most of us may think of the weather as what happened last year or the year prior. We look at weather versus what is typical in your area. Our forecasts emphasize temperature and precipitation deviations from averages, or normals. These are based on 30-year statistical averages prepared by government meteorological agencies and updated every 10 years. The 2022 forecasts are based on tabulations that span the period 1981 through 2010. Starting in next year’s edition (2023), our forecasts will be based on a data set ending 2020. Read about how climate normals are calculated.

The 2022 Old Famer’s Almanac is Now Available!

2022 Old Farmer's Almanac

Find 12 months of weather predictions and so much more! The 2022 Old Farmer’s Almanac is now available to order exclusively in our Almanac.com store and on Amazon.com.

Stay tuned as we roll out the new 2022 edition across North America in the coming weeks!

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