The first snowfall this year was a few weeks later than it has been in other years.
The first snowfall this year came several weeks later than it has in years gone by.
ーThe first snowfall this year was a few weeks later than it has been in other years.
「今年の初雪は例年より数週間遅かった。」
ーThe first snowfall this year came several weeks later than it has in years gone by.
「今年の初雪は例年より数週間遅かった。」
「数週間遅れている」は
a few weeks later
several weeks later
のように later を使って言うのが一般的です。
「初雪」は the first snowfall
ご参考まで！
カナダ 
