I’ve been tracking global warming for a number of years and have noticed that El Nino (background here link) conditions play a major role in year-to-year global temperature anomaly patterns. The 1998 El Nino was a record breaker and caused many climate skeptics to claim that climate change has stopped (link).
Here is my chart of weekly El Nino – La Nina trends for
It looks like 2015’s El Nino may break the 1998 record.
Here is NASA GISS’s (link) monthly global temperature anomaly data since 1880:
While there is significant annual and decadal variation, there is no question that global warming is happening.