If you want a graph: https://www.researchgate.net/publication/319645683/figure/fig4/AS:11431281239685177@1714468848667/Development-of-weather-forecast-skill-sin

If you want a graph: https://www.researchgate.net/publication/319645683/figure/fig4/AS:11431281239685177@1714468848667/Development-of-weather-forecast-skill-since-1981-for-3-5-7-and-10-day-lead-times-for_W640.jpg https://www.researchgate.net/publication/319645683/figure/fi... ... there is probably a newer one, it continues to improve. Keep in mind that individual locations are always hit or miss compared to the average skill. EDIT: Some better graphs at https://charts.ecmwf.int/?facets=%7B%22Type%22%3A%5B%22Verification%22%5D%2C%22Range%22%3A%5B%5D%7D https://charts.ecmwf.int/?facets=%7B%22Type%22%3A%5B%22Verif...