Or you could look at the news..?

Extensive flooding in multiple countries that didn't have such extremes before; sea level rising around smaller island nations (ok, maybe this one isn't so obvious yet but many nations are vocally concerned); wildfires across unprecedented range in time and area in multiple countries. In my own country (UK), we've had a noticeable shift over the past 10 years from four defined seasons to a smear of weather conditions across the traditional boundaries (particularly spring and autumn), significantly higher peak temperatures and the lows moving later through the year, shifted rain patterns (and worsening flooding).