Government of Tamil Nadu

Department of Economics and Statistics

Season and Crop Report 2005-06

1. RAINFALL

1.1 Rainfall and Seasonal Conditions

Tamilnadu received an average annual rainfall of 1304.1 mm during the year 2005-06, which is higher by 36.1% over the normal rainfall of 958.5 mm. The comparison of rainfall recorded during 05-06 with the normal rainfall shows that the rainfall was “Excess” in 26 districts and “Normal” in 4 districts. During the year 05-06, the highest rainfall of 2356.5 mm. was recorded in Chennai district and the lowest rainfall of 678.0 mm was recorded in Thoothukudi district.

The Seasonwise contribution of rainfall to the total rainfall during the year 05-06 is given below :

(in mm.)

Season Normal Actual Seasonal Contribution (%) % Variation to Normal
1.South-West Monsoon 332.9 308.5 23.7 -7.3
2.North-East Monsoon 459.2 828.8 63.5 80.5
3.Winter 36.8 15.9 1.2 -56.8
4.Hot-Weather 129.6 150.9 11.6 16.4
Total 958.5 1304.1 100.0 36.1

Source: India Meteorological Department, Chennai-6

1.2 South-West Monsoon Season ( June ’05 to Sep ’05 )

During the South–West Monsoon season, Tamilnadu recorded an average rainfall of 308.5 mm. This is lesser by 7.3% when compared to the normal rainfall of 332.9 mm. The Comparison of rainfall recorded during the South-West Monsoon season with the normal rainfall shows that the rainfall was “Excess” in 1 district, “Normal” in 23 districts and “Deficient” in 6 districts. During this Season, the highest rainfall of 1032.5 mm was recorded in The Nilgiris district and the lowest rainfall of 48.4 mm was recorded in Thoothukudi district.

1.3 North-East Monsoon Season ( Oct ’05 to Dec ’05 )

During the North-East Monsoon season, Tamilnadu recorded an average rainfall of 828.8 mm. This is higher by 80.5% when compared to the normal rainfall of 459.2 mm. The comparison of rainfall recorded during the North-East Monsoon season with the normal rainfall shows that the rainfall was “Excess” in 29 districts, “Normal” in 1 district. During this season, the highest rainfall of 1984.5 mm was recorded in Chennai district and the lowest rainfall of 453.6 mm was recorded in Thoothukudi district.

1.4 Winter Season (Jan ’06 & Feb’06)

During the winter season, Tamilnadu recorded an average rainfall of 15.9 mm. This is lesser by 56.8% when compared to the normal rainfall of 36.8 mm. The comparison of rainfall recorded during the Winter Season with the normal rainfall shows that the rainfall was “Normal” in 3 districts, “Deficient” in 10 districts, “Scanty” in 16 districts and “No Rain” in 1 district. During this Season, the highest rainfall of 72.4 mm. was recorded in Tiruvelveli district and the lowest rainfall of 0.2 mm. was recorded in Thiruvallur district and “No Rain” in Krishnagiri district.

1.5 Hot-Weather Season ( Mar ’06 to May ’06 )

During the Hot-Weather season, Tamilnadu recorded an average rainfall of 150.9 mm. This is higher by 16.4% when compared to the normal rainfall of 129.6 mm. The comparison of rainfall recorded during the Hot-Weather season with the normal rainfall shows that the rainfall was “Excess” in 14 districts and “Normal” in 13 districts and “Deficient” in 3 districts. During this season, the highest rainfall of 324.7 mm. was recorded in The Nilgiris district and the lowest rainfall of 44.6 mm. was recorded in Chennai district.

 

GROUPING OF DISTRICTS ACCORDING TO PATTERN OF RAINFALL

SEASON No.of Districts Excess Normal Deficient Scanty No rain
05-06 04-05 05-06 04-05 05-06 04-05 05-06 04-05 05-06 04-05
1. South-West Monsoon *30/29 1 13 23 14 6 2 -- -- -- --
2. North-East Monsoon *30/29 29 7 1 14 -- 8 -- -- -- --
3. Winter *30/29 -- 2 3 4 10 5 16 17 1 1
4. Hot weather *30/29 14 28 13 1 3 -- -- -- -- --
All Seasons *30/29 26 10 4 19 -- -- -- -- -- --
LEVELS: Excess : + 20% and above         * 2004-05 -- 29 Districts
Normal:-19.9%to+19.9%                             2005-06--30 Districts (Krishnagiri included)
Deficient: - 20% to –59.9%
Scanty: - 60% to –99.9%
No rain: -100%


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