Snow day predictors can be relatively accurate, but accuracy varies widely depending on the quality of the data used, the accuracy of the algorithms, and the specific conditions of each winter weather event.
On average, snow day predictor are most accurate when predicting light snowfall or rain events, as these conditions are easier to forecast. Predicting more severe winter weather events, such as heavy snow or blizzards, is much more challenging and less accurate.
It's also important to note that snow day predictors are not always able to take into account the many variables that can impact school closures, such as school district policies, local road conditions, and unexpected weather changes.
In general, snow day predictors should not be relied upon as the sole source of information for school closure decisions. They should be used as a guide, and decisions about school closures should be made in consultation with local weather authorities and school district officials.