unseasonably's Usage Examples:

November 30, 1864: Dawn T hat day in 1864 was unseasonably mild for late November.

15 seq.: " If any one, I do not say should blaspheme against the Lord of men and gods, but should even dare to utter his name unseasonably, let him expect the penalty of death."

It was unseasonably warm for the end of February, but this was the time of year that they might expect a few nice days.

While the air remained chilly, especially in the shaded patches, it was so clear and unseasonably warm Dean hardly noticed.

An unseasonably cool morning turned into a perfect day.