Modeling the Relationship between Rice Yield and Climate Variables Using Statistical and Machine Learning Techniques

Table 2

Summary of the statistics of climatic data.

District/Season	Variable	Mean	Min	Max	Standard deviation	Median
Kurunegala/Maha	Rainfall (mm)	777.4	374	1176	241.0	798
	Minimum temperature (°C)	22.1	20.9	22.7	0.53	22.1
	Maximum temperature (°C)	31.1	30	32.0	0.58	31.2
	Evaporation (mm)	2.61	2.07	3.09	0.26	2.63
	Sunshine (hrs)	6.0	4.4	6.9	0.69	6
	Average morning wind speed (kmph)	1.57	0.92	2.48	0.46	1.55
	Average evening wind speed (kmph)	2.19	1.37	4.4	0.81	1.98
Kurunegala/Yala	Rainfall (mm)	486.7	209.0	882.0	174.9	459.0
	Minimum temperature (°C)	24.1	22.92	24.86	0.53	24.2
	Maximum temperature (°C)	32.1	31.44	33	0.44	32.08
	Evaporation (mm)	3.06	2.68	3.5	0.24	2.99
	Sunshine (hrs)	6.84	6.1	7.6	0.39	6.8
	Average morning wind speed (kmph)	3.28	2.6	4.2	0.51	3.3
	Average evening wind speed (kmph)	3.75	2.4	5.6	1.04	3.5
Puttalam/Maha	Rainfall (mm)	590.8	221	962	229.6	611
	Minimum temperature (°C)	22.9	22.07	23.50	0.39	23.0
	Maximum temperature (°C)	30.5	29.72	31.28	0.43	30.5
	Evaporation (mm)	3.12	2.55	3.8	0.32	3.11
	Sunshine (hrs)	5.18	4.29	5.9	0.49	5.25
	Average morning wind speed (kmph)	4.07	2.4	6.3	1.23	3.6
	Average evening wind speed (kmph)	5.29	3.4	7.7	1.4	4.9
Puttalam/Yala	Rainfall (mm)	331.5	65	675	159.31	316.5
	Minimum temperature (°C)	26.0	25.1	26.88	0.35	26.05
	Maximum temperature (°C)	31.9	31.54	32.76	0.28	31.95
	Evaporation (mm)	4.98	4.68	5.29	0.20	4.95
	Sunshine (hrs)	6.02	4.89	6.97	0.54	6.07
	Average morning wind speed (kmph)	8.11	6.26	10.1	1.2	7.8
	Average evening wind speed (kmph)	10.15	8	12.84	1.52	9.81