One number cannot explain the lake
A surface reading is a sample of the water around the sensor. It does not describe every depth, creek or shaded pocket. We like having the number; we do not like letting it boss the entire trip. Note the time, area and recent weather so a warm afternoon reading is not mistaken for a permanent seasonal change.
Compare similar readings
Look at the same area at comparable times across trips when possible. On a new day, compare protected pockets, main-lake water and inflows with the same sensor. A warming pocket can be worth inspecting in cool weather, but ask whether it also has useful cover, depth and forage. Warm water with nothing else going for it is still just warm water.
Let the trend shape a short test
After sustained warming, inspect accessible shallower habitat near deeper routes. After a sharp cooling change, compare the nearby break and more protected cover before making a long run. These are staff starting bets, not a temperature table that every bass signed. Use a moving bait to look for willing fish and a more deliberate bait where you have a reason to slow down.
Record the bite's depth as well as the surface
A catch at a particular surface temperature does not establish a magic threshold. Note depth, shade, wind, clarity and whether the bait was rising, falling or moving horizontally. Over several trips, that record may reveal a useful local relationship. If the thermometer and the fish disagree, fish where the bites are. You can argue with the spreadsheet afterward.
Put it into practice
- Record time and area with each temperature reading.
- Compare recent direction of change.
- Use catches and observed depth to refine the temperature hypothesis.