Table 1. Result of semivariogram parameters used in spatial predictions for variable.

Month	Range	Sill	Partial sill	Nugget	Nugget effect
January	500.46	39.99	34.47	5.52	0.14
February	741.47	18.19	18.19	0	0
March	753.71	8.19	8.19	0	0
April	500.46	12.07	12.07	0	0
May	500.46	23.84	23.84	0	0
June	284.42	56.5	45.08	11.42	0.20
July	306.18	172.42	167.84	4.58	0.02
Augusta	512.91	415.88	288.84	127.04	0.30
September	512.91	674.37	379.89	294.48	0.43
October	500.46	435.13	214.62	220.51	0.50
November	512.91	196.03	111.84	84.19	0.42
December	538.74	75.52	55.38	20.14	0.26