Discussion: April 2018 was the 10th snowiest of the past 52 years in the northern hemisphere (Fig. 1) according to the Rutgers Snow Laboratory. Last April was 17th snowiest. April 2018 and 2017 were snowier than normal compared to the least snowy April on record observed in 2016.
Late season anomalous snow cover was easily most widespread and deepest in North America during April. The snow cover rank was 4th highest on record (Fig. 2) for the month of April compared to 24th most snowy last year. The United States ranked 5th most snowy April of the past 52 years while Canada ranked 4th most snowy.
By contrast Eurasia was not nearly as snowy as North America ranking 26th most snowy for April given the 52 year climatology (Fig. 3). Eurasia ranked essentially near normal for each month of the 2017-18 cold season while North America turned snowier for mid-to-late winter (Fig. 4). Interestingly, Alaska observed one of their most snowy winter seasons on record.
Fig. 1: Rutgers Global Snow Laboratory analysis of northern hemisphere snow cover anomalies for the month of April 2018 the past 52 years.
Fig. 2: Rutgers Global Snow Laboratory analysis of North America snow cover anomalies for the month of April 2018 the past 52 years.
Fig. 3: Rutgers Global Snow Laboratory analysis of Eurasia snow cover anomalies for the month of April 2018 the past 52 years.
Fig. 4: Monthly ranking of northern hemisphere and regions of the northern hemisphere snow cover where 53 is most snowy and 1 is least snowy.