Vienna Correctional Center Lake Water Temperature
Vienna Correctional Center Lake in Johnson County, Illinois averages about 77°F at the surface in summer — warmest in Aug (~79°F) and coldest in Dec (~48°F). These are typical values by month, not a live reading.
Typical water temperature by month
Typical surface water temperature by month, from 361 field readings (2010–2022) via the EPA Water Quality Portal. Months with too few readings are left blank.
Is Vienna Correctional Center Lake warm enough to swim?
Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Want more than temperature? Vienna Correctional Center Lake scored C on water quality — clarity, algae, phosphorus, depth, fish species, and swimming safety, all on one report card.
Water temperatures at nearby Illinois lakes
Summer average ~75°F
Summer average ~83°F
Summer average ~73°F
Summer average ~82°F
Summer average ~78°F
Summer average ~80°F
Explore water temperatures
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Frequently asked questions
What is the water temperature of Vienna Correctional Center Lake?
Vienna Correctional Center Lake has a typical summer surface temperature of about 77°F. It is usually warmest in August (around 79°F) and coldest in December (around 48°F). These are typical values by month from 361 EPA Water Quality Portal field readings (2010–2022), not a live reading.
When is Vienna Correctional Center Lake warmest?
Surface water at Vienna Correctional Center Lake is typically warmest in August, reaching about 79°F. Lake surface temperature lags air temperature by several weeks, so the warmest water usually arrives in mid-to-late summer even though the hottest air can come earlier.
Is Vienna Correctional Center Lake warm enough to swim?
At its typical summer peak of about 77°F, Vienna Correctional Center Lake rates as "comfortable" for swimming. Pleasant for swimming — the range most people find enjoyable without a wetsuit.
Where does this Vienna Correctional Center Lake water temperature data come from?
Every temperature on this page is a typical (climatological) value computed from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal — 361 readings from 4 monitoring stations between 2010 and 2022. They describe what is typical for each month, not the temperature right now.
About this data
Water temperatures are a climatology — the typical value for each month, averaged from real surface-water field readings collected by state and federal agencies and published through the EPA Water Quality Portal. They tell you what to expect, not the temperature at this moment. Actual conditions vary with recent weather, depth, and time of day.