Students put AccuWeather long-range forecasts to the test: "Though these results are based on a limited dataset that spanned only one season (essentially, meteorological autumn) and only maximum temperatures were considered, they are remarkably consistent with the experience of seasoned mid-latitude forecasters: Beyond about 10 days, climatology (on average) is as good as, if not better than, any deterministic forecast."
But don't worry your pretty head now, their 100 year forecasts are worth betting trillions on! (H/T Joel at OpenSnow)
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