Rainfall

Figure at a Glance, 2023

Season wise Rainfall (all Seasons)

       Actual (in mm.)

2375.5

       Normal (in mm.)

2216.5

Winter Season

       Actual (in mm.)

75.4

       Normal (in mm.)

47.7

Summer Season

       Actual (in mm.)

761.1

       Normal (in mm.)

539.8

Monsoon  Season

       Actual (in mm.)

1340.4

       Normal (in mm.)

1474.1

Post Monsoon

       Actual (in mm.)

198.5

       Normal (in mm.)

154.9

Source: Statistical Handbook Assam 2023

 

Month-wise Total Rainfall for some locations in Assam, 2022 (Period: 01-01-2022 to 31-12-2022):    (in mm.)

Month

Station

Guwahati

Mohanbari

Tezpur

Dhubri

Jorhat

Silchar

January

31.6

26.9

25.8

5.4

22.9

23.5

February

50.4

60.1

50.4

76.0

48.5

47.6

March

5.3

80.9

36.7

19.8

42.6

122.9

April

103.4

455.4

327.7

452.4

230.6

267.3

May

293.4

372.8

360.4

509.4

202.9

784.4

June

499.8

643.6

379.2

1065.3

321.8

906.7

July

168.8

345.4

268.6

143.8

245.8

508.2

August

152.8

313.4

100.8

170.0

167.1

105.7

September

81.4

218.5

173.0

179.4

308.5

443.5

October

155.6

253.3

133.9

382.8

235.1

163.6

November

0

0

0

0

0

4.0

December

0

30.0

5.9

0

0.9

4.5

Source: Statistical Handbook Assam 2023

 

Month-wise relative  humidity at 0830 Hrs and 1730 Hrs for some locations in Assam, 2022:  (in %)

Month

Guwahati

Mohanbari

Tezpur

Dhubri

Jorhat

Sichar

0830 hrs

1730 hrs

0830 hrs

1730 hrs

0830 hrs

1730 hrs

0830 hrs

1730 hrs

0830 hrs

1730 hrs

0830 hrs

1730 hrs

January

87

72

79

75

79

75

92

72

89

80

88

78

February

80

64

79

68

74

72

86

70

84

71

84

70

March

67

53

67

60

64

63

76

59

75

66

78

64

April

84

75

87

84

86

79

88

83

89

83

84

73

May

79

77

84

78

81

79

85

81

83

78

88

80

June

87

83

91

86

90

86

92

88

89

86

93

91

July

79

78

84

73

85

79

83

80

86

74

86

72

August

79

77

86

76

82

79

86

92

82

75

83

74

September

82

81

88

81

84

81

89

84

86

83

86

82

October

85

82

83

84

83

85

89

86

88

88

85

78

November

79

77

66

74

65

79

88

86

83

83

80

72

December

87

80

79

82

76

76

92

75

88

85

87

77

Source: Statistical Handbook Assam 2023

 

Year-wise Average monthly Rainfall in Assam, 2015 to 2022:     (in mm.)

Year

Jan

Feb

March

April

May

June

July

Aug

Sept.

Oct

Nov

Dec

State Average

2015

Actual

10.8

14.3

26.2

232.0

300.3

457.9

280.2

461.0

205.1

56.9

15.5

17.6

2077.8

Normal

16.2

32.0

78.1

172.9

304.2

427.3

454.2

356.7

285.7

131.8

24.9

11.8

2295.8

2016

Actual

18.6

20.8

67.1

325.9

326.2

300.8

396.0

168.5

272.3

100.3

40.3

5.4

2042.2

Normal

16.2

32.0

78.1

172.9

304.2

427.3

454.2

356.7

285.7

131.8

24.9

11.8

2295.8

2017

Actual

1.1

42.0

100.1

286.6

250.4

375.2

376.5

380.2

314.6

192.8

9.3

10.0

2338.8

Normal

16.2

32.0

78.1

172.9

304.2

427.3

454.2

356.6

285.4

131.8

24.9

11.8

2295.4

2018

Actual

5.5

15.7

75.7

140.5

264.0

366.9

686.6

948.6

335.9

51.7

21.0

25.3

2937.4

Normal

15.7

31.7

77.8

181.3

333.9

465.2

960.0

1337.4

303.8

136.5

22.0

11.4

3876.7

2019

Actual

2.7

28.2

45.5

171.5

402.4

350.6

634.8

201.3

308.3

84.5

10.4

2.5

2251.7

Normal

15.7

31.7

77.8

190.3

310.6

452.9

479.2

368.0

284.5

93.6

22.0

10.4

2337.0

2020

Actual

17.5

15.7

22.8

124.7

407.9

597.9

581.4

271.5

427.8

164.6

20.1

1.1

2652.7

Normal

15.1

32.7

77.7

190.3

310.6

452.9

479.2

368.0

284.5

133.2

22.1

10.4

2377.0

2021

Actual

11.1

2.8

38.4

70.8

214.0

381.4

288.0

296.7

966.1

120.2

3.9

9.5

2402.9

Normal

15.6

32.9

75.4

180.3

287.9

412.5

452.2

336.3

1201.0

126.7

22.5

8.1

3151.4

2022

Actual

23.5

51.9

44.3

317.6

399.2

669.6

277.9

190.3

202.7

193.3

0

5.2

2375.5

Normal

15.6

32.1

75.4

181.5

282.9

416.5

442.7

325.7

289.2

122.3

21.5

11.1

2216.5

Source: Statistical Handbook Assam 2023

 

District wise Average Monthly Rainfall in Assam, 2020:  (in mm)

District

January

February

March

April

May

June

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

1

2

3

4

5

6

7

8

9

10

11

12

13

Kokrajhar 

0.3

10.1

22.2

22.4

45.4

56.4

256.5

241.9

585.5

442.1

1120.7

784.5

Dhubri 

4.5

15.6

7.1

23.2

21.2

50.4

256.4

192

593.3

423.2

670.3

665

Goalpara 

9.6

9.1

4

14.3

4

52.4

382

207.1

731.6

392.9

598.6

553.3

Barpeta 

6.3

9.3

28.3

24

13.5

61.7

75

205.6

644.4

375.2

979

678.2

Morigaon 

9.4

14.2

24.6

24

0

51.2

119

116.9

139.4

172.3

217.9

294.5

Nagaon 

11.8

13.5

7.2

24.6

7.8

51.6

106.5

134.3

153.2

201.9

150.1

258

Sonitpur 

11.4

21.9

35.6

44.7

24.8

79.7

72.9

158.5

288.5

221.9

271.1

287.8

Lakhimpur 

50.6

28.6

39.9

52.6

38.3

76.7

68.7

170.1

340.5

300.5

671.4

515.1

Dhemaji 

4.7

26.2

32.6

60.7

86.6

80.1

166.6

137.2

568.3

327.2

1286.4

481.8

Tinsukia 

31.3

30.2

21.1

56.5

25.9

136.1

103.2

239.3

320.5

262.6

687.2

379.3

Dibrugarh 

39

33

35.9

53.7

36.7

111

114.4

229.8

326.1

253.5

563.6

390.4

Sivasagar 

39

15.7

23.2

23.9

16.5

46

54.6

148.8

317.4

256.2

393.4

311.5

Jorhat 

40.5

20.9

19.2

41.8

18.6

68.1

80.4

164.4

320.6

238.7

504.7

291.6

Golaghat 

13.7

15.7

14.3

36

10.2

66.1

113.1

143

199.2

209.1

212.9

266.1

Karbi Anglong 

5

11.1

1.6

23.3

7.7

47.3

71

100.6

112.3

136.8

169.5

209.4

Dima Hasao 

3.1

12.3

2

33

33.3

108.8

122.9

209.2

313.2

263.7

417

379.5

Cachar 

27.2

11.6

0.1

52.7

21.9

165.6

179.3

297

304.5

383.5

601.5

539.4

Karimganj 

22.3

11.2

0.7

56.5

25.1

179.3

50.1

302.1

431.7

511.3

945.1

655

Hailakandi 

35.9

7

0

38.5

6.8

135.7

84.4

231.6

320.5

403.9

468.1

469.6

Bongaigaon 

3.6

10

8.6

29.2

14.2

60.6

43

205.5

607.2

407.9

628.7

628.2

Chirang 

6.8

8.3

15

17.9

36.6

80.7

58.8

243

842.4

431.1

1114.2

741

Kamrup 

16.6

7.8

8.5

17.3

9.6

43

126.9

144.2

466.9

217.3

693.6

284.1

Kamrup Metro 

30

10.8

15.1

18.3

33.8

48.6

217.1

181

351.9

286.4

479.6

399.1

Nalbari 

17.7

12.4

12.5

25.4

18.4

65.5

105.5

201.1

633.4

338.7

775.7

486.2

Baksa 

12.5

11.5

6.4

20.1

21.1

66.5

123.9

197.4

608.5

329.9

941.8

408.5

Darrang 

6.2

17.2

7

26.7

9

63.5

37.9

186.9

125.9

300.9

159.5

418.7

Udalguri 

13.9

13.1

26.7

21.3

28.3

46.1

177.2

150.2

365.2

298.5

421.1

453.6

State Average 

17.51

15.12

15.53

32.69

22.79

77.73

124.71

190.32

407.86

310.64

597.88

452.94

Contd.

District

July

August

September

October

November

December

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

Actual

Normal

1

14

15

16

17

18

19

20

21

22

23

24

25

Kokrajhar 

1290.2

835.1

497.9

620.3

1202.7

466

197

188.2

0.6

16.8

0

5.8

Dhubri 

736.7

668.1

387.6

461.6

679.8

345.4

153.3

183.7

0

15.1

0

5.3

Goalpara 

493.1

571.2

299.6

381.3

328.7

313

86.4

156

2.6

21.5

0

5

Barpeta 

1173.1

765.3

280.6

495.2

869

442.3

112.5

148.5

18.6

18

7.3

10.9

Morigaon 

97.5

337.6

214.4

302.5

264.4

213.8

208.8

112.3

0

15.4

0

5.7

Nagaon 

118.5

293.1

92.4

271.6

162.5

190.4

158.4

101.8

6

18.8

0

7.4

Sonitpur 

317.8

375.3

204

315.4

194.9

212.7

139.4

95.6

10.9

26.7

1

1

Lakhimpur 

671

629

332.6

484.7

537.1

374.1

230

124.4

12.8

22.7

8.7

16.7

Dhemaji 

1033.8

507.8

591.1

471.1

741

359.9

407.9

133.1

80.2

12.4

0

20

Tinsukia 

497

493.9

401.1

352.7

346.1

291

179.7

120.2

59.4

29.3

0

13.7

Dibrugarh 

433.9

516.6

271.5

390.6

249.1

314

186.1

119

35

21.9

0

12.5

Sivasagar 

365.4

356.3

294.8

293.8

302

202.9

107.3

95.1

50.8

20.7

0

15.6

Jorhat 

448.3

379.6

264.1

332.4

202.6

272.4

146.9

97.9

34.9

23

1.7

16.6

Golaghat 

271.1

318.6

194.9

278

244.5

216.6

186.1

109.3

8.5

26.8

0

13

Karbi Anglong 

226.5

242

150

220.7

242.3

190.3

202.2

96.5

20.3

23.1

0.3

9.6

Dima Hasao 

358

286.4

94.4

230.9

161

188.9

69

147.8

15.2

40.6

0

11.1

Cachar 

556.3

512

380.4

460.9

355.1

355.1

319.9

182

38.4

36.9

0

18.8

Karimganj 

783

619.4

401.8

524.2

429.2

388.1

338.2

188.8

36

35

0

15.2

Hailakandi 

517.4

426.5

359.7

382.7

287.3

275.6

293.8

152.1

72.7

35.8

0.2

15.6

Bongaigaon 

783.3

769.7

236.8

510.9

723.5

401

98.8

165.1

34.8

17.2

0

10.4

Chirang 

1552

729

422.9

460.3

1237.4

361.4

121.2

206.6

2

5.4

4

2.8

Kamrup 

426.9

286.2

131.4

235.6

277.2

172.7

75.4

79.4

0

12

0

4.1

Kamrup Metro 

319.5

372.6

183.1

316.8

263.9

213.8

61.9

141.2

0

12.8

0

10

Nalbari 

772.5

499.3

257.2

327.9

451.1

273.3

98.8

123.8

0.3

19.4

1.8

11.1

Baksa 

807.8

391.7

168.7

228.5

407.7

197.9

100.3

113

0

23.2

4.3

7

Darrang 

206.9

335.5

45.5

271.7

86.1

231.2

40.3

110.3

2

18.5

0

10.2

Udalguri 

439.2

421.3

171.4

314.7

304.1

218.6

125

105

1.2

28.9

0

5.6

State Average 

581.36

479.23

271.48

368.04

427.79

284.53

164.61

133.21

20.12

22.14

1.09

10.4

Source: Statistical Handbook Assam 2021

 

Month wise & Agro Climatic Zone wise Rainfall in Assam during 2020:   (in mm)

Agro-Climatic Zone

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Lower Brahmaputra

Actual

107.9

127.7

217.8

1645.1

6065.1

8002.2

8355.1

2865.8

6441.0

1105.6

58.9

17.4

Normal

104.9

212.1

585.8

2018.8

3644.7

5628.1

5888.2

4038.4

3186.8

1505.5

161.4

72.4

North Bank Plain Zone

Actual

86.8

141.8

187

523.3

1688.4

2809.5

2668.7

1344.6

1863.2

942.6

107.1

9.7

Normal

107

206

346.1

802.9

1449

2157

2268.9

1857.6

1396.5

568.4

109.2

53.5

Central Brahmaputra

Actual

21.2

31.8

7.8

225.5

292.6

368

216.0

306.8

426.9

367.2

6.0

0

Normal

27.7

48.6

102.8

251.2

374.2

552.5

630.7

574.1

404.2

214.1

34.2

13.1

Upper Brahmaputra

Actual

163.5

113.7

107.9

465.7

1483.8

2361.8

2015.7

1426.4

1344.3

806.1

188.6

1.7

Normal

115.5

211.9

427.3

925.3

1220.1

1638.9

2065.0

1647.5

1296.9

541.5

121.7

714

Barak Valley Zone

Actual

85.4

0.8

53.8

313.8

1056.7

2014.7

1856.7

1141.9

1071.6

951.9

147.1

0.2

Normal

29.8

147.7

480.6

830.7

1298.7

1664

1557.9

1367.8

1018.8

522.9

107.7

49.6

Hills Zone

Actual

8.1

3.6

41

190.9

425.5

586.5

584.5

244.4

403.3

271.2

35.5

0.3

Normal

23.4

56.3

156.1

309.8

400.5

588.9

528.4

451.6

379.2

244.3

63.7

20.7

State Average

Actual

17.5

15.5

22.8

124.7

407.9

597.9

581.4

271.5

427.8

164.6

20.1

1.1

Normal

15.1

32.7

77.7

190.3

310.6

452.9

479.2

368.0

284.5

133.2

22.1

10.4

Source: Statistical Handbook Assam 2021

 

Mont-wise Rainfall pattern in Assam during 2022:   (in mm)

Month

Actual

Normal

Departure from Normal (in %)

Status

January

23.5

15.6

50.64%

Excess

February

51.9

32.1

61.68%

Excess

March

44.3

75.4

(-)41.25%

Deficient

April

317.6

181.5

74.99%

Excess

May

399.2

282.9

41.11%

Excess

June

669.6

416.5

60.77%

Excess

July

277.9

442.7

(-) 37.23%

Deficient

August

190.3

325.7

(-) 41.57%

Deficient

September

202.7

289.2

(-) 29.91%

Deficient

October

193.3

122.3

58.05%

Excess

November

0

21.5

(-) 100.00%

No rains

December

5.2

11.1

(-) 53.15%

Deficient

Total

2375.5

2216.5

7.17%

Normal

Source: Statistical Handbook Assam 2023

 

Season-wise Rainfall pattern in Assam 2020 to 2022:  (in mm.)

Season

2020

2021

2022

Winter  (January & February)

Actual

33.0

13.9

75.4

Normal

47.8

48.5

47.7

Summer  (March to May)

Actual

555.4

323.2

761.1

Normal

578.6

543.6

539.8

Monsoon  (June to September)

Actual

1878.6

1932.2

1340.5

Normal

1584.6

2402.0

1474.1

Post Monsoon  (October to December)

Actual

185.8

133.6

198.5

Normal

165.7

157.3

154.9

All Seasons  (January to December)

Actual

2652.8

2402.9

2375.5

Normal

2376.7

3151.4

2216.5

Source: Statistical Handbook Assam 2023

 

Month-wise mean maximum and minimum temperature for some locations in Assam, 2022: (in degree Celsius)  

Month

Guwahati

Mohanbari

Tezpur

Dhubri

Jorhat

Sichar

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

Max

Min

January

25.2

11.5

23.8

10.2

24.4

12.3

22.7

13.3

23.3

9.7

25.2

14.0

February

25.1

11.0

23.4

10.8

24.3

12.8

22.6

13.7

23.6

10.2

25.9

13.4

March

33.7

18.3

30.7

16.9

32.5

19.3

31.7

20.9

30.8

16.1

33.3

19.5

April

30.3

21.5

26.4

18.7

27.9

21.2

28.1

22.1

27.0

19.2

32.1

22.8

May

32.2

23.6

29.6

21.7

30.8

24.0

29.9

23.5

30.5

22.1

30.8

23.6

June

31.8

25.4

30.1

23.9

31.1

25.4

29.8

25.0

31.1

24.0

30.0

24.9

July

35.4

26.5

33.5

25.3

33.8

26.9

33.4

27.5

33.4

27.9

34.6

26.4

August

35.2

26.7

33.6

25.3

34.2

27.1

32.9

27.2

33.9

25.1

34.3

26.5

September

34.2

25.7

31.4

24.0

32.8

25.9

31.4

26.2

32.4

24.0

33.0

25.7

October

31.7

22.6

29.8

20.9

31.0

22.9

29.5

23.7

30.4

21.4

32.2

24.1

November

30.3

17.3

29.4

14.2

29.4

16.8

27.2

18.8

28.9

14.1

30.6

18.9

December

27.3

14.1

26.1

11.9

26.2

14.7

24.7

15.7

25.8

11.4

27.5

15.8

Source: Statistical Handbook Assam 2023

 

Month-wise Rainfall Since 1977 to 2019:

Year

Month wise rainfall (mm)

Annual

Jan

Feb

Mar

Apr

May

June

July

Aug

Sept

Oct

Nov

Dec

Total rainfall (mm)

P.C. departure from normal

1977

13.2

29.0

86.0

390.5

437.7

558.4

486.5

600.5

263.2

194.9

40.3

25

3125.2

29%

1978

5.9

32.8

62.3

95.5

210.4

368.8

365.0

236.8

314.4

109.3

63.7

Nil

1864.9

-23%

1979

6.5

5.1

39.3

61.5

176.6

318.8

466.4

231.7

295.5

212.4

28.6

38.4

1880.8

-23%

1980

8.0

52.1

66.9

187.9

269.3

369.1

433.8

443.6

220.1

166.4

Nil

Nil

2217.2

-9%

1981

33.9

33.7

88.5

147.2

222.5

254.6

448.7

331.2

246.9

48.3

10.1

24.9

1890.5

-22%

1982

0.9

32.4

44.4

253.3

172.3

365.6

458.8

307.1

214.4

63.8

33.5

17.8

1964.3

-19%

1983

27.6

41.4

107.8

193.3

251.8

359.9

448.8

328.3

370.7

164.3

7.5

32.0

2333.4

-4%

1984

16.0

9.5

33.6

198.8

359.2

337.6

470.6

253.6

366.2

128.5

4.3

27.4

2205.3

-9%

1985

9.9

25.5

118.2

239.3

220.1

450.1

471.0

269.6

293.7

75.0

6.6

29.3

2208.3

-9%

1986

10.2

10.3

24.1

257.3

135.7

298.4

398.2

313.2

293.6

227.0

40.0

5.8

2013.8

-17%

1987

3.5

27.9

111.7

203.1

194.0

524.3

627.0

355.4

394.2

126.9

14.4

6.6

2589.0

7%

1988

11.5

43.4

82.5

155.3

486.9

304.9

506.0

649.1

358.4

168.8

129.8

7.8

2904.4

19%

1989

14.5

57.6

28.3

202.8

282.0

469.7

589.5

285.7

441.6

170.7

23.0

8.8

2574.2

6%

1990

15.5

62.9

90.0

357.0

274.2

455.2

400.7

270.4

372.6

187.0

11.8

7.1

2504.4

3%

1991

16.3

36.2

61.5

212.0

507.6

454.1

377.3

348.2

344.0

162.9

12.3

42.8

2575.2

6%

1992

18.1

56.0

63.1

123.5

285.6

353.0

440.3

314.0

242.7

131.5

10.9

Nil

2038.7

-16%

1993

55.1

121.3

81.1

124.0

381.5

554.5

551.8

423.8

261.9

115.8

4.2

3.1

2678.1

10%

1994

30.5

37.2

175.6

203.0

309.5

466.1

299.5

272.4

184.0

160.4

17.8

5.2

2161.2

-11%

1995

9.9

42.4

50.2

186.2

309.9

512.4

541.5

450.6

378.5

68.4

66.8

10.5

2627.3

8%

1996

16.4

43.0

147.0

121.6

509.4

296.4

510.9

439.7

209.4

335.1

5.1

0.5

2634.5

8%

1997

14.0

52.9

97.3

131.9

266.7

538.4

395.4

243.2

373.8

25.6

14.7

35.7

2189.6

-10%

1998

10.0

45.5

174.3

223.1

219.9

660.3

487.0

468.2

227.5

168.8

18.6

0.7

2703.9

11%

1999

2.6

0.6

42.8

179.5

463.5

432.8

556.8

544.6

230.7

198.9

16.9

0.7

2670.4

10%

2000

16.9

26.8

82.2

235.6

355.8

404.3

345.9

403.7

296.7

72.1

34.6

0.9

2275.5

-6%

2001

3.8

36.3

48.1

209.6

275.5

336.3

359.1

254.0

235.0

170.1

33.0

6.7

1967.5

-19%

2002

21.7

8.0

82.4

279.2

239.6

355.2

428.5

393.6

218.5

46.8

53.6

11.8

2138.9

-12%

2003

8.9

46.4

91.8

228.6

232.6

544.5

482.0

222.8

220.0

164.1

13.1

13.6

2268.4

-7%

2004

24.2

29.4

78.9

350.1

425.8

377.9

554.2

341.7

261.4

236.8

16.3

7.63

2704.3

11%

2005

28.2

48.5

183.6

246.2

294.3

340.6

422.2

372.2

153.4

168.3

9.1

3.3

2269.9

-7%

2006

0.7

47.2

17.4

153.5

251.5

392.0

314.1

251.8

221.5

77.3

17.9

5.3

1750.2

-28%

2007

1.4

76.2

25.7

206.4

178.0

406.3

409.6

292.0

324.3

122.6

26.6

7.2

2076.3

-15%

2008

28.3

13.4

109.3

153.5

201.1

358.8

371.5

440.2

247.9

120.9

1.8

1.4

2048.1

-13%

2009

4.2

10.0

40.0

145.2

185.3

270.7

341.2

409.4

160.6

118.1

12.6

2.9

1700.2

-25%

2010

0.2

2.4

87.2

360.0

329.6

443.5

326.0

319.4

287.8

82.9

9.2

7.1

2255.3

-1%

2011

10.1

10.3

90.0

74.7

225.4

267.6

382.0

268.8

191.6

31.4

11.4

2.3

1565.6

-32%

2012

8.3

6.2

22.2

234.1

164.1

528.8

471.6

248.9

305.7147.910.33.72151.8-6%
20131.49.147.9103.7298.2238.1368.3297.2224.0115.80.82.31706.8-26%
201416.232.078.1172.9304.2427.3454.2356.7285.7131.824.911.82295.8-19%
201510.814.326.2232.0300.3457.9280.2461.0205.156.915.517.62077.8-9%
201618.620.867.1325.9326.2300.8396.0168.5272.3100.340.35.42042.2-11%
201716.232.078.1172.9304.2427.3454.2356.6285.4131.824.911.82295.42%
20185.5115.7275.74140.46263.96366.88686.63948.61336.9151.7121.0125.262937.4-24%
20192.6928.1845.50171.47402.43350.61634.77210.30308.3084.5010.402.502251.70-4%

Source: IMD, RMC, LGBI Airport, Borjhar.

            Statistical Handbook Assam 2014 to 2020