adv.not in accordance with the season

"it was unseasonably cold"

Unseasonably Fishy
Discounted Auto Loans Lead To Unseasonably Big Volume Jump
The Unseasonably Cool Summer of 1999 and Its Impacts on the Crop Growth and Development in Zhejiang Province
Xmas laughs in short supply ... Comedy is unseasonably weak says GRAHAM YOUNG Christmas TV
British industrial output took a big hit in February due to 'unseasonably warm weather'
Unseasonably low fall and winter temperatures affecting mountain pine beetle and pine engraver beetle populations and damage in the ...
MAKING WARM MEMORIES ; Thousands gather downtown to soak up unseasonably warm evening, holiday cheer
A DAY TO SHED ALL NOTIONS OF WINTER; Unseasonably wonderful Mild spell could last another 10 days, area forecasters say.(NEWS)
Observations of Multiple Sea Breeze Boundaries during an Unseasonably Warm Day in Metropolitan New York City.
Assessment of climatologic variables in unseasonably warm winter 2006-2007 using data from regional meteorological stations Borová ...