The Weather Station Sensor
Four rooftop sensors measure temperature, rainfall, wind, and sunlight. One sensor sent an impossible reading during a calm, dry hour. The technician uses the channel assignments and the error report to find the faulty unit.
Your task
Which sensor sent the faulty reading?
- 1
The faulty reading reported rainfall during the dry hour.
- 2
North measures temperature.
- 3
South measures wind and West measures sunlight.
- 4
Each sensor measures exactly one condition.
Solution revealed
Solution
The answer: East sensor
The impossible value came from the rainfall sensor. North, South, and West are assigned to temperature, wind, and sunlight respectively. Because every sensor has one different task, East must be the rainfall sensor and therefore sent the faulty reading.
Read the complete solution reasoning (spoiler)
Why this answer is the only fit
East sensor is correct.
The impossible value came from the rainfall sensor. North, South, and West are assigned to temperature, wind, and sunlight respectively. Because every sensor has one different task, East must be the rainfall sensor and therefore sent the faulty reading.
Original RankDaily puzzle · Manually reviewed · Last updated 20 7 月, 2026