A quote from first hit on “temperature spike”:
The extraordinary global warmth was set in motion by the long-term climate-warming trend, but it surged to another level because of the record-challenging El Niño event that released into the atmosphere large quantities of heat stored in the tropical Pacific Ocean.
The heat injection helped this February pass February 1998, the previous record holder, by a whopping 0.47 degrees Celsius (0.85 Fahrenheit).
https://www.washingtonpost.com/news/capital-weather-gang/wp/2016/03/14/the-planet-had-its-biggest-temperature-spike-in-modern-history-in-february/
But to be fair to PWM, they don’t mention El-Nino once in the headline.