Share of graded forecasts in each decade. Decades with fewer than 20 graded forecasts are left out.
"Sun at the burrow" = at least 30 minutes of sunshine between 7 and 9 am local standard time on Feb 2, from ERA5 reanalysis at the forecaster's coordinates. Bars are 95% intervals.
Mean departure of the six weeks from the 30 years before, °F, at the same station-years as the forecasts. Interval: 95%, resampling whole years, because burrows a few miles apart share one year's weather.