On Sunday, InSight recorded a high of 2 degrees Fahrenheit (minus 17 Celsius) and a low of minus 138 degrees Fahrenheit (minus 95 Celsius). Compare that with Sunday's coldest U.S. temperature: minus 27 degrees (minus 3 Celsius) in Taylor Park, Colorado.
Scientists need to know the local Mars weather to determine if InSight's seismometer is registering real marsquakes or simply wind or pressure changes. InSight landed near the Mars equator in November. NASA's Curiosity rover also gives weather updates, while roaming around Mars about 340 miles (550 kilometers) away.