Monthly Pan Evaporation for Springfield, IL (site 11-8179)
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Year	April	May	June	July	August	September	October
1980	M	M	7.57	M	7.15	5.65	4.14
1981	M	6.36	7.98	7.04	6.64	5.26	3.87
1982
1983	4.73	6.92	8.27	10.31	M	M	M
1984	5.16	7.04	8.99	8.39	8.49	5.66	3.34
1985	6.36	8.61	7.02	7.26	6.36	6.34	3.73
1986	7.17	6.75	8.36	9.05	7.79	5.96	5.91
1987	5.68	10.10	9.42	7.75	7.55	6.55	4.28
1988	6.91	10.91	11.96	11.59	9.27	6.66	4.58
1989	6.30	7.04	8.39	8.88	7.48	5.98	5.06
1990	5.90	5.72	8.48	9.10	6.72	5.54	5.72
Average	6.03	7.72	8.64	8.82	7.49	5.96	4.51
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.