Last month was recorded as the hottest May on record, according to the National Oceanic and Atmospheric Administration (NOAA), since the organization started recording temperatures in 135 years ago. The previous 4 months were each the hottest on record for that month as well. 2015 is forecast to break last year’s record for the highest global average temperature once again. Thirteen of the 14 hottest years on record have been in this century.

While portions of North America had an unusually cool month over the course of May, the rest of the world had many areas that saw higher than average temperatures. The U.S. National Weather Service is predicting that the current El Niño will persist through the 2015-2016 winter, and may also bring more record-breaking temperatures to affected regions.

Fortunately, a protracted El Niño could bring much needed rain to California, of which is currently suffering a record-breaking four-year drought.