Predicting the weather typically caps out around 10 days in advance for certain factors, but a new study could extend that up to almost two months. By measuring the surface temperature of oceans from 1982 to 2015, specifically in 2012, The New York Times writes that a team of researchers (PDF) noticed correlations between a pair of precursors leading to hotter days in parts of North America: precipitation deficits and "anomalous atmospheric wave trains." The former is pretty easy to understand. The latter, standard parts of atmospheric flow caused by wind, are abnormal patterns of crests and troughs leading to shore.