Period

Mann Kendall Stat

Sen’s Slope estimator

MK-stat

z-stat

p-value

Trend

Slope

Lower

Upper

Monthly

January

45

0.7850

0.4325

no

0.0163

−0.0147

0.0566

February

75

1.3202

0.1868

no

0.0160

−0.0150

0.0447

March

57

0.9991

0.3177

no

0.0346

−0.0329

0.1238

April

101

1.7841

0.0744

no

0.0382

−0.0061

0.1352

May

121

2.1409

0.0323

yes

0.0509

0.0031

0.1088

June

107

1.8911

0.0586

no

0.0262

−0.0014

0.0663

July

143

2.5334

0.0113

yes

0.0272

0.0043

0.0601

August

167

2.9616

0.0031

yes

0.0293

0.0091

0.0639

September

181

3.2114

0.0013

yes

0.0296

0.0129

0.0541

October

201

3.5682

0.0004

yes

0.0358

0.0162

0.0599

November

157

2.7832

0.0054

yes

0.0289

0.0072

0.0507

December

81

1.4273

0.1535

no

0.0359

−0.0111

0.0686

Seasonal

Rainy season

173

3.0687

0.0022

yes

0.0357

0.0135

0.0659

Dry season

131

2.3193

0.0204

yes

0.0296

0.0024

0.0736

Annual

151

2.6762

0.0074

yes

0.0318

0.0096

0.0662