Our Methodology

1. Forecast sources

Weather Consensus integrates WeatherAPI.com, Visual Crossing, Open-Meteo, and the National Weather Service (NWS), part of the U.S. National Oceanic and Atmospheric Administration (NOAA), where available. The Forecast Inputs panel identifies the sources contributing to a particular forecast. Weather Consensus is independent and is not affiliated with, sponsored by, or endorsed by NOAA or NWS. Each provider may use its own weather models, observational inputs, update schedule, and data-processing methods.

Weather Consensus organizes available provider data by forecast date so that comparable daily values can be examined together. A provider may not supply every weather variable or every requested day. Provider availability and coverage can change.

2. Calculating the consensus

For available comparable daily values, the app generally calculates an arithmetic average for quantities such as temperature, wind speed, and selected weather indices. Missing or nonnumeric values are excluded from those calculations.

Precipitation probability uses dedicated comparison and consensus logic. Because providers may report rain probability and general precipitation probability differently, these figures should be interpreted with particular care. The displayed value is a synthesis of the available inputs, not a newly generated physical weather model.

Wind direction requires special treatment because compass headings wrap around at 360°. Where direction data is available, the application uses directional calculations rather than a simple arithmetic average of degree values.

Temperature and wind unit switches are display conversions: they do not alter the underlying provider forecasts or consensus calculation.

3. What agreement scores measure

The Model Agreement Overview compares available provider values for the chosen date and variable. Some metrics use closeness thresholds; others use a normalized measure of the differences between forecast values.

• Temperature, precipitation, and wind: numerical comparisons produce agreement percentages used in the overview.
• Humidity: provider pairs count as agreeing when their reported humidity values are within 10 percentage points.
• UV Index: provider pairs count as agreeing when daily maximum UV values are within 2 UV Index points.
• Wind direction: where available, provider pairs count as agreeing when directions are within 45 degrees of each other.

When fewer than two usable source values are available for a comparison, an agreement percentage may not be shown.

4. Overall confidence and Activity Focus

The application displays an overall confidence indicator derived from its temperature, precipitation, and wind agreement assessments. It is an interpretation of agreement, not a calibrated statistical probability.

Activity Focus uses different weights for those three agreement categories:

• General: temperature 34%, precipitation 33%, wind 33%.
• Outdoor Work: temperature 30%, precipitation 40%, wind 30%.
• Boating: temperature 15%, precipitation 25%, wind 60%.
• Outdoor Event: temperature 20%, precipitation 60%, wind 20%.
• Driving / Travel: temperature 20%, precipitation 35%, wind 45%.

These are application-defined starting weights, not validated safety or performance standards. Activity Suitability separately considers forecast conditions and potential concerns; high model agreement does not imply good conditions for an activity.

5. Freeze and snow/ice indicators

Freeze and snow/ice assessments use available forecast signals, which may include minimum temperatures, precipitation probabilities, snow probabilities, predicted snowfall, weather descriptions, and provider-specific weather codes.

These assessments are simplified risk classifications. A risk label is not a prediction of exact pavement conditions, ice accumulation, or a guarantee that a hazard will—or will not—occur. Local surface temperature, elevation, exposure, timing, and treatment can materially change actual conditions.

When interpreting freezing precipitation, the application distinguishes provider weather-code systems rather than assuming that the same code means the same thing across providers.

6. Limitations and responsible use

• Forecast uncertainty: all forecasts can change as new observations arrive, especially for precipitation, thunderstorms, and winter weather.
• Geographic detail: a city-level forecast may not represent every neighborhood, road, lake, or work site.
• Timing: daily summaries can hide important hourly differences, including brief periods of dangerous weather.
• Data availability: missing values or temporary provider outages may reduce the number of sources used.
• Different definitions: forecast variables are not always perfectly comparable across providers.
• No guarantee: agreement indicators and risk labels have not been presented here as calibrated accuracy probabilities.

7. Ongoing improvements

Weather Consensus is evolving. Its source integrations, agreement rules, risk assessments, presentation, and documentation may be refined over time. This page is intended to make the application's general approach understandable; it is not a complete technical specification or an independent validation study.

Questions or feedback? Contact Weather Consensus.