The USGS (U.S. Geological Survey) publishes a set of the most commonly used topographic maps of the U.S. called US Topo that are separated into rectangular quadrants that are printed at 22.75"x29" or larger. Lake Herman is covered by the Serena, IL US Topo Map quadrantFree US Topo Map PDF Order Waterproof Printed Topo Map
Below are weather averages from 1971 to 2000 according to data gathered from the nearest official weather station. The nearest weather station for both precipitation and temperature measurements is GEBHARD WOODS STATE P which is approximately 15 miles away and has an elevation of 505 feet (109 feet lower than Lake Herman). Because the nearest station and this geographic feature may have differences in elevation and topography, the historic weather at the two separate locations may be different as well.
|Month||Precip||AVG High Temp||AVG Low Temp|
This location's average summer high temps are lower than 58% of other locations on record.
This location's average winter low temps are lower than 71% of other locations on record.
This location's average precipitation levels are higher than 50% of other locations on record.