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Background: Recently, much of the country was affected by the “Polar Vortex” – a really cold air circulation pattern that brought Arctic cold temperatures to places like Maine and Minnesota. For several days, it was really, really cold – the high temperature of each day stayed below zero! Nights tend to be even colder than the days.
The graph shows how many nights in each year have been below -10°F (minus ten degrees Fahrenheit) from about 1970 through the end of 2013, when the Polar Vortex affected us.
Data Source: Minnesota Public Radio, citing Climate Central; data from NOAA/NWS.
Questions:
Describe what the graph shows about how the number of very cold nights (the nights below -10°F) have changed.
I interpret the graph to mean….
