Lower Subansiri district, which is one of the 16 administrative districts of the state of Arunachal Pradesh in northeastern India, is bounded on the north by the Upper Subansiri district of Arunachal, on the south by Papum Pare District of Arunachal Pradesh and Assam, on the east by West Siang and some part of Upper Subansiri, and on the west by East Kameng district of Arunachal Pradesh. Major languages used in the district include Apatani, a Tibeto-Burman language written in the Latin script and spoken.

Lower Subansiri History

In the year 1946, the District area was carved out of the Balipara Frontier Tract in the name of Subansiri Area with its Headquarter at North Lakhimpur. In the year 1954, Subansiri Area was renamed as the Subansiri Frontier Division and its Headquarter was later transferred to Ziro. Like other parts of NEFA, the District was also under the jurisdiction of Ministry of External Affairs and over-all Incharge was a Political Officer.  On 1st September, 1965, the Ministry of Home Affairs took over the Administrative charge of NEFA from the Ministry of External Affairs, and the Subansiri Frontier Division was rechristened as Subansiri District, and Political Officer was redesignated as the Deputy Commissioner, Addl. Political Officer as Addl. Deputy Commissioner, Assistant Political Officer as Assistant Commissioner, Assistant Political Officer as Extra Assistant Commissioner and Base Superintendent as Circle Officer respectively.

On 13th May1980, Subansiri District was divided into Lower and Upper Subansiri District. Upper Subansiri District was created by covering the area of the then Daporijo Sub-Division and rest of the area of former Subansiri District was placed under Lower Subansiri. Finally on the 22nd September, 1992, Lower Subansiri District was again bifurcated, hence leading to the formation of Papumpare District

Lower Subansiri Climate

The climatic conditions of the district vary from place to place as well as season to season owing to the topography of the region. The climate has an impact by the nature of terrain depending upon altitude and location of place. Broadly, there are four major seasons experienced. The cold weather season is starts from December and continues till February.  March to May is the pre-monsoon season of thunders storms which is followed by the South West monsoon from the month of June to about the middle of October and the second half of October to November which constitutes the post monsoon or the retreating monsoon period. It is a period of transition.
 
In the foot hills or low high belt area of the district, the climatic condition is moderate as compared to the high belt areas, where during winter, it is very cold and chill, and in summer, it is pleasant. December and January are generally the coldest months, and July and August are the warmest months. Annual rainfall in the South is heavier if compared to the Northern areas of the district. During the monsoon period, more than 70 percent of the rainfall occurs over the Southern half whereas in the Northern portions it is about 60 percent. Variability of rain fall for the monsoon and the year, as a whole, are comparetively small. Average Annual Rainfall of the district Headquarter, Ziro is recorded as 934.88 Cms. In the year 2000.