UT falls in the northern plains although it lies close to Shiwalik hills. For general vegetation there are 2 major growth periods-Feb to march (spring and rainy months of July and august). Leaf fall for non-ever green vegetation is experienced during Feb to march.
The average annual rainfall varies from 400mm to 600mm as a result the sanctuary remains humid during June to September and the relative humidity varies from 60-70 % and average annual temperature ranges between 1 °C to 45 °C Sukhna WLS acts as a ‘Green Lung‟ to the heavily congested and over populated capital of 2 states of Haryana and Punjab and the seat of U.T. Administration.