Physiographic
The tea area being located in the temperate zone and in the tropic of Cancer proximity were receiving rain during the month of March to October. But due to global warming monsoon rain has shrunken on both ends of the year, now rain start in the month of April and close in the month of September. Annual quantum of rain has got reduce to less than 120” which was earlier over 135”/140” per year. Tea is a rain dependent crop.