Sunny days on Mars come with a weather warning: Dust storms ahead!
The researchers found that 78% of dust storms during that period were preceded by an extended period of what passes for "warm" and sunny days on Mars. (The average surface temperature on Mars is minus 60 degrees Celsius, or minus 80 degrees Fahrenheit, but can on occasion reach up to 20 degrees C, or 70 degrees F, at the equator.)