Monthly Pan Evaporation for Chicago Botanical Gardens, Glencoe, IL (site 11-1497)
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Year	May	June	July	August	September	October
1997	M	M	M	4.96	3.72	2.95
1998	5.23	5.81	6.19	4.57	3.95	2.77
1999	4.69	5.77	7.32	4.85	3.86	2.42
2000	4.14	8.04	5.20	4.64	4.02	2.63
2001	5.29	5.15	6.05	4.96	3.41	3.72
2002	M	4.68	5.98	5.74	3.76	1.94
2003	4.33	5.37	6.05	5.32	3.74	2.30
2004	M	4.70	5.24	4.36	4.02	2.31
2005	M	6.03	6.30	5.54	3.97	2.34
2006	M	5.44	5.43	5.24	4.39	M
2007	M	5.46	6.36	4.58	4.51	3.52
2008	M	5.40	6.39	5.00	3.14	2.32
2009	M	5.28	4.58	5.15	3.21	1.93
2010	4.75	M	M	5.43	M	3.17
2011	4.66	4.96	7.02	4.94	3.59	3.05
2012	5.46	7.09	7.25	5.08	3.60	2.44
2013	4.33	5.40	5.62	4.97	3.85	2.07
2014	4.44	5.26	5.70	4.51	3.29	2.48
Average	4.74	5.59	5.92	4.99	3.82	2.61
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.