Metro Manila (CNN Philippines, May 14) — The heat index in Aparri, Cagayan reached “extremely dangerous” levels Tuesday as it posts the highest perceived temperature so far this year, according to the country’s weather bureau.

Aparri’s heat index hit 57.6 degrees Celsius at 2 p.m., data from the Philippine Atmospheric, Geophysical and Astronomical Services Administration said. This falls under the “extreme danger” category, where temperatures above 54 degrees Celsius may cause higher incidences of heat stroke.

Relative humidity is at 95 percent in the area, which contributed to the increase from the dry-bulb temperature of 33.2 degrees Celsius.

The heat index measures the actual temperature felt by people by factoring in the humidity levels in the area.