and hot in the noon which blows steadily from west to east. Under the impact of Loo (hot wind) the land becomes parched, the green vegetables wither and fodder crops like Barseem, and Ruzka orchards, maize, fodder, sugarcane and vegetable fields are repeatedly irrigated to protect them from the scorching heat.
At the occurrence of Loo the outdoor activities of farmers remain suspended and they go to their fields only after 4 p.m. At the outbreak of summer monsoon, the temperature comes down.
The cloudy weather and high relative humidity help in the reduction of the day and night temperatures in the months of July, August and September read around 34°C and 35°C, while the mean minimum temperature reads around 25°C (Table 2.1).
The mean minimum temperature declines suddenly in the month of October, being only 17.5°C, yet the day temperature reads around 32°C.
All the towns lying to the south of the Siwaliks (Akhnur, Hiranagar, Kathua, Samba, etc.) observe intense tropical heat in the months of May and June.
During the summer season in the City of Jammu and its environs, a cool wind descends from the Siwaliks in the night time which is locally known as Dadu.
The climate of the plain region and the Middle Himalayas including the Pir Panjal in characterised by a rhythm of seasons which is caused by the reversal of winds in the form of the south-west and the north-east monsoons.
The reversal of pressure takes place regularly twice in the course of a year.
The mean monthly temperature at the Jammu City reads well above the 20°C, the annual range of temperature being about 17°C.
The outstanding feature of the annual march of temperature is the occurrence of maximum before the commencement of summer monsoon, i.e., in the month of May or June.