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 Rajasthan

TEMPERATURE REGIMES

Marked variations in diurnal and seasonal range of temperatures occur at all places in the state, exhibiting the most characteristic phenomenon of the warm-dry continental climate.

The month of March marks the beginning of summer and the temperature starts rising progressively through April, May and June.  The temperature rise during this period is almost uniform all over the state.  In the western part, mainly at Bikaner, Phalodi, Jaisalmer and Barmer, the maximum daily temperatures varies between 40oC to 45oC.  Occasionally, it rises to 49oC during the summer months.  The diurnal temperature variation is greater in summers.  The minimum daily temperature drops down considerably at night and remains between 20oC to 29oC.  On the eastern side of the Aravalli range, the day temperatures are in a similar range but night temperatures hover around 26oC.  At Udaipur and Mount Abu, temperature, however, is relatively lower and the mean daily maximum temperature in summer reaches 38oC and 31.5oC, respectively.  The daily minimum temperature for these two stations is around 25oC and 22oC, respectively.

The isotherms of summer (June) show variations from 42oC (Sirohi district) to above 47oC (Ganganagar district).  A major part of the state , comprising the arid zone of the west and the semi-arid zone of the mid-west, has an average maximum of 45oC in this month.  However, in the south-eastern parts, the isotherms show a declining trend from 43oC to 37oC.

January is the coldest month of the year.  The winter season remains from December through February with marked decline in minimum temperatures in December and January.  The minimum temperatures may fall to minus 2oC in the night at some places like Sikar, Churu, Pilani and Bikaner.  A sharp decrease in night temperatures is experienced throughout the arid and semi-arid zone of western Rajasthan on account of quick release of thermal radiation from the sandy soil soon after dusk.  Occasional secondary Western disturbances which mostly cross western, nothern and eastern Rajasthan during winter months, causing light rainfall, may also lower the night temperatures and increase wind speed creating wind-chill effect.

The isotherms of winter (January), ranging from less than 6oC in the north to above 10oC in the south-east, show few variations in temperatures.  The greater part of Rajasthan, except the south-eastern part of Kota, Bundi and Baran and the western district of Barmer exhibits the mean temperatures of more than 10oC.  The secondary depressions (western disturbances) accompanied by the ice-cold winds, emanating from the higher latitudes, may bring entire Rajasthan under the spell of the cold wave for the periods of 2 to 5 days during winter months.


 
Nodal Officer : Er Inderjeet Bishnoi, Email : dditjpr.wr@rajasthan.gov.in, Phone No. : 0141-2702672 Ext. 229