Monthly Pan Evaporation for Hennepin, IL (site 11-4013)
(use the tabs at the bottom to change location)
Year	May	June	July	August	September	October
1980	8.85	6.55	7.92	7.00	5.04	M
1981	M	7.95	6.84	M	4.28	M
1982	M	5.54	8.69	7.29	3.41	M
1983	M	7.10	9.37	6.28	M	M
1984	M	7.76	5.57	7.77	4.01	3.08
1985	7.04	8.68	5.22	7.17	9.17	M
1986	M	7.04	7.14	6.55	3.88	4.69
1987	8.03	7.45	9.09	6.80	4.14	M
1988	M	M	M	8.45	4.80	M
1989	6.62	7.07	7.76	6.36	4.49	M
1990
1991	M	8.29	8.96	7.85	7.05	M
1992	M	7.54	6.31	5.78	5.23	M
1993
1994	M	M	M	M	4.61	3.08
1995	4.75	6.40	M	6.90	5.41	5.33
1996	M	M	6.89	6.21	3.65	6.83
1997	M	7.89	9.32	8.68	M	M
1998	M	M	7.74	6.52	5.66	M
1999
2000
2001	5.59	5.58	6.61	5.93	4.76	M
2002	5.62	6.07	7.51	6.14	5.46	M
2003
2004
2005	M	7.58	7.75	6.52	M	M
Average	6.64	7.16	7.57	6.90	5.00	4.60
State Climatologist Office for Illinois
Illinois State Water Survey
Prairie Research Institute
University of Illinois Urbana-Champaign
"M" indicates that the data are missing. Pan evaporation is typically only measured during the warmer months of the year.