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 Climate Information of Jorhat 

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        The center receives an average annual rainfall of 1723 mm in 99 rainy days. The rainy season starts during 1st week of June and ends in 2nd week of November with duration of 23 weeks. The average monsoon seasonal rainfall (June to September) is 1135 mm and can vary from 788 mm to 1392 mm. Peak rainfall occurs during 2nd week of June. Daytime temperature varies from 22.0° C (2nd week of January) to 33.0° C (1st week of July), while the nighttime temperature varies from 8.3° C (1st week of January) to 25.6° C (last week of July).

 

Average Weekly Weather Data 

WEEK MAXT (°C)  MINT (°C)  RH-I   (%)  RH-II (%)  WS (kmph)  RF (mm/week)  SSH   (hrs)  EVP (mm/week)
1 23.7 8.3 96 66 1.4 9.4 6.1 8.8
2 22.0 8.8 96 72 1.6 7.7 5.0 7.2
3 22.4 9.3 96 70 1.6 3.8 5.5 8.1
4 23.0 10.2 94 67 1.6 5.7 5.0 9.4
5 23.3 11.1 94 68 1.9 6.7 5.8 9.0
6 24.8 10.9 93 64 1.8 3.8 7.2 10.1
7 26.4 11.8 92 63 1.8 4.5 7.1 11.8
8 25.7 12.8 92 65 2.4 8.7 6.5 14.9
9 26.6 13.6 90 65 2.4 8.2 6.6 16.0
10 27.2 14.0 90 62 3.0 2.6 5.8 18.0
11 26.9 15.2 91 64 2.9 8.0 6.0 18.0
12 27.7 15.1 91 66 3.2 12.6 4.6 18.7
13 28.3 16.6 91 69 2.8 30.0 5.0 17.4
14 28.9 17.5 91 68 3.7 15.8 6.2 19.3
15 29.3 18.5 91 69 3.3 30.7 5.8 18.7
16 29.9 19.1 91 69 3.1 31.6 4.7 19.7
17 28.3 20.1 92 76 3.8 76.3 2.5 17.7
18 28.5 21.0 93 75 3.2 64.6 3.2 14.6
19 31.3 21.9 91 72 2.9 27.8 7.1 19.3
20 32.7 22.8 89 69 2.8 23.4 6.3 24.2
21 31.2 23.5 91 77 3.0 48.6 4.7 18.0
22 31.3 23.9 91 75 3.0 60.1 4.3 18.7
23 32.0 24.0 91 74 3.3 93.0 4.9 21.1
24 31.9 24.3 90 76 3.3 56.5 3.8 20.7
25 32.2 24.8 91 77 3.0 56.6 3.4 20.4
26 31.8 25.0 91 77 3.1 67.4 2.4 18.0
27 33.0 25.5 91 77 3.3 68.8 5.2 20.1
28 32.0 25.0 93 78 3.7 90.0 3.8 18.8
29 32.3 25.0 92 78 4.1 81.7 3.9 21.9
30 32.6 25.6 91 77 3.2 73.9 3.3 22.5
31 32.1 25.0 92 77 3.3 41.0 3.5 18.1
32 33.0 25.0 91 76 2.3 60.9 4.4 19.1
33 32.0 24.9 92 77 2.5 63.4 4.1 18.0
34 31.7 24.9 92 78 2.1 85.8 3.2 17.2
35 31.8 24.5 93 76 2.0 61.9 2.9 16.4
36 32.2 24.5 92 76 1.6 20.5 4.2 16.0
37 32.5 24.1 92 73 1.9 60.7 5.4 18.4
38 31.6 23.7 92 75 1.6 57.2 4.7 18.4
39 31.2 23.7 92 77 1.8 46.1 6.4 16.6
40 31.3 23.4 93 75 1.3 39.8 5.3 18.0
41 31.9 22.7 91 72 1.1 11.6 6.4 13.9
42 30.3 21.3 93 75 1.7 47.0 4.7 14.2
43 30.3 20.2 92 73 1.4 4.1 7.5 12.5
44 29.7 18.9 93 73 1.5 2.3 6.1 11.7
45 29.2 17.3 94 73 1.3 0.0 7.2 12.1
46 27.3 16.0 95 75 1.6 9.2 6.9 11.0
47 27.1 15.6 95 73 1.7 14.3 5.0 9.6
48 27.3 13.9 95 70 1.2 0.2 7.3 11.8
49 26.2 11.9 95 69 1.4 0.0 7.8 8.9
50 25.2 10.8 95 65 1.6 0.1 8.2 8.7
51 24.4 9.8 96 66 1.4 4.4 8.1 7.9
52 23.9 8.6 97 66 1.5 1.4 7.9 8.8

 

    Rainfall Statistics (Database 1998-2001)

Monthly and Annual Rainfall Normals (mm)

Parameter

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

Annual

Average

 9.5 17.8 51.5 170.0 199.0 308.5 338.0 265.5 223.0 120.5 19.5 0.3 1723.0

Lowest

5.0 0.0 25.0 125.0 95.0 229.0 215.0 201.0 143.0 43.0 2.0 0.0 1229

Highest

 14.0 31.0 110.0 228.0 391.0 412.0 431.0 381.0 259.0 269.0 43.0 1.0 2226.0

SD

 3.7 15.7 39.7 45.0 132.3 78.6 104.4 82.9 53.7 101.0 18.8 0.5 429.2

CV (%)

 38.9 88.6 77.0 26.5 66.5 25.5 30.9 31.2 24.1 83.8 96.3 200.0 24.9

Seasonal Rainfall Normals (mm)

 Parameter  

SW MONSOON (Jun-Sep)

NE MONSOON (Oct-Dec)

WINTER (Jan-Feb)

HOT WEATHER (Mar-May)

Average

 1135.0 140.3 27.3 420.5

Lowest

788.0 70.0 5.0 308.0

Highest

 1392.0 271.0 41.0 558.0

SD

 265.9 90.3 17.0 105.1

CV (%)

 23.4 64.4 62.3 25.0

Normal Rainy Days

 Parameter  

SW MONSOON (Jun-Sep)

NE MONSOON (Oct-Dec)

WINTER (Jan-Feb)

HOT WEATHER (Mar-May)

ANNUAL (Jan-Dec)

Average

 60.0 7.0 4.3 27.0 99.0

Lowest

52.0 5.0 1.0 24.0 89.0

Highest

 65.0 9.0 7.0 35.0 109.0

SD

 6.1 1.7 2.8 7.4 13.1

CV

 10.2 24.4 64.8 27.4 13.2

 

 Weekly Rainfall Probability (%) for different amounts

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

Mean start, end, duration and rainfall during the season

 MEAN START = 23*

As Early As = 22*

As Late As = 23*

 STD.DEV = 0.6

 MEAN END = 45*

As Early As = 42*

As Late As = 47*

STD.DEV = 2.4

 MEAN DUR = 23*

MIN DUR = 20*

MAX DUR = 25*

STD.DEV = 2.4

MEAN CSR** = 1298mm

MIN CSR** = 864mm

MAX CSR** = 1739mm

STD.DEV = 380.0mm

                    * Standard Meteorological Week          

                    ** Crop Season Rainfall (CSR)

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