CLIMATE & TOPOGRAPHY
The topography of the region is the extension of Cachar valley. The plain has a formation of alluvial deposition by the Jiri River. The ridge runs north to south from the centre of the town and intermingles with the highland of Aglapur. On both the sides of the ridge there are alluvial plain. Most of the settlements are found on this highland. The plain area is fertile due to alluvial soil and is generally used for cultivation. The general slope of the town is from north to south. This region is favourable for the development of the town and its hinterland and for its future widespread.
In terms of climate, unlike the other parts of the state, Jiribam is extremely hot in summer and moderately cold in winter. Jiribam is only 45 kilometres far away from Silchar and being a neighbouring area of Assam the climatic condition is almost similar to some parts of Assam. The climate of this region is humid tropical characterized by short winter and long summer. Summer season starts from March and continues up to October and winter season starts from November to February. Dry season falls in the month of May and June which is the hottest season. The month of May records the highest temperature which is about 40°C.Temperature is pleasant in autumn season which falls around September to November. The coldest/ lowest temperature is recorded in the period between second half of December to first half of January (i.e., below 2.78°C) at night. However, days are comfortably warm even in this period, which is same even in the rainy season. Jiribam is highly humid throughout the year. The highest amount of humidity occurs during Monsoon season. The maximum quantity of humidity in the district is 100% and the minimum is 79% in June and the lowest quantity falls in the months between October to December. The relative humidity, as a whole in Jiribam and its region, is usually higher than that of the rest of the state.
Rainfall of Jiribam is usually higher due to hot and hilly area. It lies under the direct influence of south-west monsoon and rainfall is abundant in comparison to other places of the state. The annual rainfall is about 20-30% during the pre-monsoon season in the month of May whereas about 60-70% of rainfall occurs in rainy season and the range of rainfall in the second half of June to September is 1000mm to 1600mm. A meager quantity of frost is also found in between second half of December. The topography of the region is such that there is high incidence of severe winds (cyclone). Strong wind activities occur between the months of March and July from the periodic South-West Monsoon.