This study examines recent changes in monthly mean of maximum temperature (M-MAX), relative humidity (M-RH) and total rainfall (TMRF) of Coffee Research Sub Station (CRSS), Chettalli, N-Coorg, Karnataka, India over approximately last four decades stretching between years 1975 to 2012. The long–term change in temperature, relative humidity and rainfall has been assessed by linear trend analysis. The increasing trend in mean of maximum (M-MAX) temperature and relative humidity and decreasing trend in total mean annual rainfall (TMRF) is confirmed by Mann-Kendall trend test. It is observed that monthly mean of maximum (M-MAX) temperatures have increased significantly for all the months and for annual. While monthly mean of relative humidity (M-RH) has increased for the months from May to November and it is decreased from December to April months. The annual M-RH observed an increasing trend but is statistically insignificant. While monthly mean of TMRF have increased significantly for the months of March, April, July, September, October, November and December whereas it shows decreasing trend in January, February, May, June and August for the station. Similarly the mean of annual total rainfall observed a decreasing trend having an annual decrease of 2.992 mm per year.
CRSS, Rainfall, Relative Humidity, Temperature, Trends
