long-range weather forecasts Long-Range Weather Forecasting Methodology

Find a Long-Range Forecast
Daily, long-range weather forecasts available for cities within the USA as far as 12 months in advance.

Weather Forecast Accuracy
Long-range weather forecast verified accuracy of up to 85% over the long term for identifying dry periods in the weather.

Frequently Asked Questions
The most commonly asked questions about our long-range weather forecast system and how to use our daily long-range weather forecasts.

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Add long-range weather forecasts to your website! No banner ads.  Long-range weather forecasts integrated directly into your website for free!

About the DRYDAY® System

DRYDAY.com is the leading provider of daily long-range weather forecasts for personal planning and industry, and has been since 1999. DRYDAY.com provides FREE 30-day DRYDAY® Forecasts for more than 50,000 cities worldwide. DRYDAY outdoor planning forecasts are also available for a nominal fee, as far as 18 months in advance, with no erosion of accuracy.

DRYDAY® forecasts are designed to help in planning outdoor activities. These forecasts indicate, months in advance, the dates in which there is little risk for rain.

Vacations, weddings, parties and other events of a personal nature may be planned to avoid weather inconveniences.

Similarly, business commitments such as sales promotions, critical construction phases and conferences may be scheduled with the confidence that rain or snow will not interfere and that favorable weather will improve profitability.

DRYDAY® forecasts are the result of a 30 year, privately sponsored research program which began in 1964.

The research program was spearheaded by Paul E Ruch, a Massachusetts Institute of Technology (MIT) alumni and former head of the Meteorology Department at the California Institute of Technology (CALTECH) along with his son, Paul E Ruch II, a University of Los Angeles (UCLA) trained meteorologist who was also a US Air force Weather Officer. As a result of their accomplishments within this field, both Paul E Ruch and Paul E Ruch II received the coveted fellowship from the London Royal Society for the encouragement of Arts, Manufacturers and Commerce (RSA).

The fundamental object of this research was to develop methods to prepare accurate and precise long range weather forecasts. The resulting DRYDAY® forecasts tell you when to expect storm-free days.

DRYDAY® forecasts are reliable - usually about 80% of the forecasts will be correct. In each month a few forecasts will provide 90% or greater accuracy.

DRYDAY® forecast have been a commercially viable product for over 20 years. They have been extensively used by the Agriculture, Construction and Utility Industries. Monthly DRYDAY® forecasts have also been published in a variety of news publications.

We welcome you to use our FREE 30-day DRYDAY® Forecasts to plan all of your weather sensitive activities with greater confidence and success.


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