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 Climate Information of Trissur 

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       The center receives an average annual rainfall of 2736 mm in 112 rainy days. The rainy season starts during 1st week of June and ends in 3rd week of November with duration of 25 weeks. The average monsoon seasonal rainfall (June to September) is 2018 mm and can vary from 1520 mm to 2723 mm. Peak rainfall occurs during 2nd week of June. Daytime temperature varies from 28.9° C (3rd week of July) to 36.1° C (2nd week of March), while the nighttime temperature varies from 21.9° C (4th week of January) to 25.2° C (1st week of May).

 

Average Weekly Weather Data

WEEK MAXT (°C)  MINT (°C)  RH-I   (%)  RH-II (%)  WS (kmph)  RF (mm/week)  SSH   (hrs)  EVP (mm/week)
1 32.1 22.7 72 44 10.2 1.1 8.9 46.2
2 32.4 22.4 74 44 9.9 0.1 8.7 46.5
3 33.0 22.4 74 42 9.4 1.0 8.7 46.8
4 33.5 21.9 71 36 9.2 0.0 9.3 50.9
5 33.8 22.1 73 37 8.4 1.8 9.3 48.3
6 34.4 22.6 76 39 7.5 1.2 9.1 47.7
7 34.9 22.8 79 39 6.2 0.7 9.3 44.5
8 35.1 23.0 81 41 5.6 4.5 9.4 43.7
9 35.7 23.0 78 37 6.2 6.1 9.2 49.9
10 36.0 23.4 82 38 5.6 1.6 9.2 46.3
11 36.1 24.0 84 44 4.8 4.9 9.2 46.1
12 35.9 24.3 84 47 4.6 1.6 9.0 44.7
13 36.0 24.7 85 50 4.6 2.9 8.7 45.6
14 35.8 24.6 84 52 4.5 13.5 8.4 41.9
15 35.2 24.9 85 54 4.4 25.4 7.9 40.0
16 35.1 25.0 85 56 4.4 20.3 8.2 38.4
17 35.0 25.1 86 56 4.5 17.5 8.1 38.1
18 34.7 25.2 86 58 4.4 20.2 7.8 37.9
19 34.2 25.1 87 59 4.4 39.4 7.5 36.5
20 33.4 24.8 88 63 4.3 44.6 6.4 32.9
21 33.2 24.5 89 64 4.3 47.1 6.8 31.5
22 32.2 24.1 90 69 4.2 93.9 5.4 27.6
23 30.2 23.3 93 77 4.2 151.6 3.4 22.1
24 29.4 23.1 94 81 4.3 195.2 2.6 20.6
25 29.7 23.2 94 78 4.2 145.7 3.5 21.7
26 29.3 23.0 94 79 3.8 194.9 3.2 21.1
27 29.4 23.0 94 78 3.9 142.4 3.4 20.9
28 29.0 22.9 94 80 3.9 147.4 2.9 20.1
29 28.9 22.8 95 80 3.9 169.0 2.4 19.4
30 29.0 22.9 94 78 3.9 141.8 3.2 20.3
31 29.2 23.2 95 78 4.0 114.2 3.5 21.1
32 29.1 23.1 95 78 3.7 98.4 3.2 21.2
33 29.2 23.2 94 78 3.8 113.3 3.7 21.9
34 29.7 23.3 94 75 3.9 79.4 4.2 23.8
35 29.7 23.4 94 73 3.8 67.2 5.0 25.0
36 30.2 23.2 93 71 3.5 51.9 5.7 24.7
37 30.8 23.3 92 67 3.6 34.2 7.0 26.6
38 30.8 23.2 92 68 3.5 44.8 6.1 25.9
39 30.9 23.3 92 70 3.2 70.8 5.4 23.7
40 30.6 23.2 92 73 3.2 65.9 5.2 23.0
41 30.8 23.1 92 72 3.1 97.4 5.3 22.4
42 31.3 22.9 91 68 3.1 63.7 6.2 23.7
43 31.7 23.0 91 67 3.1 61.1 6.5 23.9
44 31.6 23.1 89 65 3.7 50.5 6.4 24.0
45 31.4 23.0 86 65 4.4 38.8 5.9 24.0
46 31.7 23.0 85 61 4.5 21.3 6.9 26.9
47 31.9 23.1 80 58 5.7 19.0 7.3 29.6
48 31.9 22.4 77 53 7.2 1.5 8.2 34.4
49 31.6 22.8 75 53 8.7 6.1 8.1 37.6
50 31.8 22.2 74 50 8.3 9.9 8.4 38.7
51 31.8 22.6 74 49 9.9 0.2 8.7 44.2
52 32.1 22.4 74 45 9.6 1.5 9.2 45.4

     

    Rainfall Statistics (Database 1984-2002)

Monthly and Annual Rainfall Normals (mm)

Parameter

 Jan Feb Mar Apr May June Jul Aug Sep Oct Nov Dec

Annual

Average

 2.3 4.5 8.5 76.7 189.3 714.2 665.2 412.3 226.5 318.8 99.5 18.9 2736.5

Lowest

0 0 0 8 42 399 335 258 29 111 7 0 2214

Highest

 19 27 38 242 584 993 1001 638 698 520 377 67 3628

SD

 5.4 7.9 11.6 62.8 143.5 184.4 220.4 116.3 173.1 114.5 99.5 25.1 439.8

CV (%)

 237.9 176.4 136.6 81.8 75.8 25.8 33.1 28.2 76.4 35.9 100 132.9 16.1

Seasonal Rainfall Normals (mm)

 Parameter  

SW MONSOON (Jun-Sep)

NE MONSOON (Oct-Dec)

WINTER (Jan-Feb)

HOT WEATHER (Mar-May)

Average

 2018.2 437.2 6.7 274.5

Lowest

1520  143.0 0  70.0

Highest

 2723 766 27 626

SD

 416.3 154 8.6 154.8

CV (%)

 20.6 35.2 127.9  56.4

Normal Rainy Days

 Parameter  

SW MONSOON (Jun-Sep)

NE MONSOON (Oct-Dec)

WINTER (Jan-Feb)

HOT WEATHER (Mar-May)

ANNUAL (Jan-Dec)

Average

 78 19 0.7

13

 112

Lowest

 58 12 0

4

 90

Highest

 100 31 3

22

 139

SD

 10.4 5.5 0.9

6.0

 13.9

CV

 13.3 29.1 129.4

46.3

 12.4

 

Weekly Rainfall Probability (%) for different amounts

WEEK Upto 10mm 20mm 30mm 40mm 50mm 75mm 100mm >100mm
1 15 5 0 0 0 0 0 0
2 0 0 0 0 0 0 0 0
3 5 5 0 0 0 0 0 0
4 0 0 0 0 0 0 0 0
5 5 5 0 0 0 0 0 0
6 5 5 5 0 0 0 0 0
7 5 0 0 0 0 0 0 0
8 10 5 0 0 0 0 0 0
9 15 5 5 5 5 0 0 0
10 10 10 0 0 0 0 0 0
11 10 0 0 0 0 0 0 0
12 10 5 0 0 0 0 0 0
13 21 15 5 0 0 0 0 0
14 47 36 26 15 10 10 0 0
15 47 36 31 21 21 15 15 5
16 57 47 36 31 21 5 5 0
17 84 47 42 31 21 10 0 0
18 68 47 42 31 26 15 0 0
19 52 52 36 26 21 15 15 10
20 84 68 63 52 36 36 21 10
21 89 63 47 42 36 26 26 15
22 94 84 78 68 63 57 52 47
23 99 99 100 94 89 84 63 63
24 99 99 99 99 100 94 89 89
25 100 100 100 100 100 94 89 68
26 100 94 94 89 89 89 84 68
27 100 100 89 84 84 84 73 68
28 100 100 100 100 89 89 89 89
29 99 100 94 89 89 89 78 73
30 99 94 89 84 84 78 63 57
31 94 94 94 89 78 78 73 42
32 100 100 100 100 89 78 57 36
33 100 94 89 78 78 73 63 57
34 94 84 78 73 68 68 42 26
35 94 84 68 57 47 36 26 26
36 94 73 63 52 36 36 31 15
37 78 63 42 36 31 26 15 10
38 78 57 42 36 26 26 21 15
39 84 84 68 57 47 47 42 36
40 100 89 73 63 63 63 42 31
41 100 100 89 73 68 63 52 36
42 100 78 73 63 63 63 42 26
43 100 100 84 73 63 52 31 21
44 89 63 57 52 42 31 21 21
45 84 63 47 47 42 42 21 15
46 52 36 21 21 15 15 5 5
47 36 21 21 15 15 15 10 10
48 10 0 0 0 0 0 0 0
49 31 26 15 5 5 0 0 0
50 31 31 21 10 10 5 0 0
51 5 5 0 0 0 0 0 0
52 10 5 5 0 0 0 0 0

 

Weekly Rainfall values at different Probability levels

 WEEK

PRECIPITATION (mm) FOR THE PROBABILITIES(%)
90 75 50 25 10
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ANN          

 Crop Season Rainfall Characteristics

Mean start, end, duration and rainfall during the season

 MEAN START = 23*

As Early As = 22*

As Late As = 24*

 STD.DEV = 0.8

 MEAN END = 48*

As Early As = 44*

As Late As = 52*

STD.DEV = 2.5

 MEAN DUR = 25*

MIN DUR = 21*

MAX DUR = 30*

STD.DEV = 2.6

MEAN CSR** = 2474mm

MIN CSR** = 1925mm

MAX CSR** = 3477mm

STD.DEV = 475mm

                    * Standard Meteorological Week          

                    ** Crop Seasonal Rainfall (CSR)

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