As greenhouse gases rise, we get more record hot months, but they are even more likely during an El Nino. Just like 1998, we have a strong one developing now. So far, this year is the warmest ever (Last year is currently the record holder), and 2015 has already seen a the hottest ever March and May, with January and February coming in as second hottest ever. Below is a look a the warmth by Latitude: