Fetching details from the dictionary...

especially; particularly; unusually; above all
今年の夏は異に暑く、連日猛暑日が続いた。
This summer was unusually hot, with extreme heat continuing day after day.
彼女の演奏は異に素晴らしく観客を魅了した。
Her performance was exceptionally splendid and captivated the audience.
この地域は異に降水量が多いことで知られる。
This region is known for having particularly high rainfall.