In a land area of 1,950 square kilometers the Diocese of Quilon presently comprises the major part of the civil district of Kollam (Kollam, Karunagappally and part of Kunnathur Taluks), the taluk of Karthikappally, portions of Mavelikkara and Chengannur, which lie south of the river Pampa in the civil district of Alappuzha. A very small portion of Pathanamthitta district (Parumala) also falls within the Diocese of Quilon.
Malayalam language is in use. English, a mandatory subject in public schools, is widely spoken and understood. Minority speaks Tamil.
The state basically enjoys 4 types of climate such as Winter, Summer, South West Monsoon and North East-Monsoon.
The winter season sets in during the month of December and continues till end of February. During this season comparatively there is less rainfall especially in the northern parts of the state.
Winter is followed by the summer season. Its starts in February and continues till May. Occasional showers with lightning is a characteristic of this season. The South West Monsoon begins either in the end of May or in the beginning of June and fades out by September. Moving towards north, this seems to gain intensity. The North East Monsoon commences in October, dry weather setting in by the end of December. The annual range of temperature is comparatively low in Kerala. The coastal areas record a maximum temperature of 320c and a minimum of 220c. In the coastal area it is hot and humid during April-May while cool during December-January.
Quilon diocese also know as Kollam diocese is situated on the south west coast of India. It extends from latitude 9° 28' N to 8° 45' and longitude 76° 28' to 77° 17' N. The district is bound on the north by Alappuzha diocese, north east by the Pathanamthitta district, on the east by Thirunelveli district of Tamil Nadu, on the south by Thiruvananthapuram district and on the west by the Arabian Sea.