"Weather variability" refers to the changes or fluctuations in weather conditions that occur over short periods of time. It means that the weather can be unpredictable and change from day to day, or even within the same day. Full definition
With a ton of land and plenty of weather variability, it will take much longer before a majority of the public feels the effects of extreme weather. (psmag.com)
High profile research published in 2012 built a case to link increasing weather variability to climate change. (news.mongabay.com)
It can not be dismissed any more as natural weather variability. (ethicsandclimate.org)