The mountain range of Negros Island running from north to south is responsible for the occurrence of two types of climatic conditions in the province.
The whole eastern part of the province falls under the third type of climate which is characterized by not very pronounced maximum rainfall with a short dry season from one (1) to three (3) months. The other half falls under the first type, characterized by a distinct wet and dry season. A dry month is one wherein rainfall is less than two (2) inches.
The temperature for the entire province ranges from 21.50C, 22.80C and 23.70C in 2002. The maximum temperature reached to about 34.50C and this was recorded during the month of July. The minimum temperature recorded in the month of April is about 20.60C.
The northern part of the province experiences occasional typhoons more than the southern part.
From June to September, the prevailing wind is southwest monsoon (“Habagat”). From November to February, the prevailing wind is the northeast monsoon (“Amihan”). The season for variable winds is from March to May.
Oriental Negros basks outside the typhoon belt. The island’s backbone of high mountain ranges breaks the full effects of the southwest monsoon and keeps weather generally fair all year round. However, at times, typhoons also visit the province.
Those that hit the Bicol region or Central Luzon in a northeasterly direction usually raise a storm signal No. 1, or sometimes cause no effect to the province at all. However, the northern part of the province, from Canlaon City to La Libertad, is within the path of typhoons coming from the Surigao-Samar direction.
Humidity is the degree of moisture content in the atmosphere. Relative humidity in the province range between 78% and 84%. Annual average humidity in the province is approximately 82%.
