Related Clues:
- Totting up
- Common San Francisco forecast
- Vision obscurer outdoors
- Obstacle to visibility
- Kindergarten math lesson
- Hazard for takeoffs and landings
- It 'comes on little cat feet,' per Carl Sandburg
- Low-visibility forecast
- Arithmetic skill
- Dense mist
- Summing together
- "Pea soup" weather
- Low-hanging clouds produce it
- Mist relative
- Math operation used in KenKen puzzles