They may have had 1 week AN, but not the month. Because they are daily, they can jump around with the best of them as we know. The oldest precip forecast at the free Euro site goes back to the 1/7 forecast. Here's the link. More recent forecasts can be found by clicking on the triangle icon to the top, right of the map. The accuracy of the forecasts probably depend on who's looking at the map! Lol
https://charts.ecmwf.int/products/extended-anomaly-tp?base_time=202601070000&projection=opencharts_north_america&valid_time=202601190000