Using Eight Crops to Show the Correlation between Paucity Irrigation and Yield Reduction of Al-Hussainiyah Irrigation Project in Karbala, Iraq

Table 1

Summary of the average climatic parameters of the study area for the period between 1990 and 2018 [34].

Climatic parameter	January	February	March	April	May	June	July	August	September	October	November	December
Mean air temperature (°C)	10.5	13.2	17.8	24.4	30.2	34.7	37.0	36.7	32.5	26.1	17.5	12.1
Mean rainfall (mm)	16.9	13.9	10.2	12.3	1.9	0	0	0	0.4	2.8	9.6	14.1
Mean maximum air temperature (°C)	16.1	19.1	24.0	31.3	37.6	42.2	44.5	44.4	44.4	33.9	24.1	18.1
Mean minimum air temperature (°C)	4.8	7.4	11.5	17.6	22.8	27.2	29.5	29.0	24.6	18.2	11.0	6.2
Mean monthly evaporation (mm)	59.2	92.0	170	237.1	329.4	408.4	438.2	395.8	301.0	201.8	100.4	61.5
Mean relative humidity (%)	74.3	61.2	50.1	43.1	34.8	29.0	30.5	32.3	37.3	46.4	61.2	71.6
Mean sunshine duration (hr/day)	5.9	7.0	7.8	8.3	9.4	10.9	11.2	10.9	10.0	8.1	7.1	6.0
Mean wind speed at 2 m height (m/sec)	1.7	2.0	2.3	2.4	2.4	3.1	3.2	2.5	1.9	1.5	1.3	1.4