Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Most of the US is bracing itself for the worst of the cold weather this winter, while some areas have already experienced their coldest day of the year. To find out when you need to dig your winter coat and gloves, the National Oceanic and Atmospheric Administration (NOAA) has published a 'Coldest Day of the Year' map. The green areas will have their coldest days next year, while the purple and blue regions are expected to have their temperatures drop later this month. The map was created using data from the 1981–2010 US 'Climate Normals.' This refers to 30-year averages of climatological variables including the average low temperature for every day.Green areas have their coldest days next year, while purple and blue will have it this monthThe west reaches its coldest day in December, and most of the eastern US feels the cold in JanuaryIn a separate map, the NOAA has outlined its prediction for when you will see snow in your area 
 Question:According to _ chief Deke Arndt, this is the same 'normal' dataset that you hear referred to in weather forecasts, in reference to normal lows and highs for a day.

NOAA