logo
When to Expect the Coldest Day of the Year
news image
Special Stories
4 Dec 2018 9:32 AM
[Crossing a snowy bridge. From pixabay via NOAA] [NOAA]  Many areas of the country this week will feel the coldest temperatures that have been felt since last winter. To give you a better idea of the coldest time of year for your area, NOAA has created “Coldest Day of the Year” maps across the nation. The maps are derived from the 1981–2010 U.S. Climate Normals—NCEI’s 30-year averages of climatological variables including the average low temperature for every day. From these values, scientists can identify which day of the year, on average, has the lowest minimum temperature, referred to here as the “coldest day.” The map reveals several interesting regional differences across the country. Most prominently, the western half of the contiguous United States typically reaches its climatological coldest day in December, whereas most eastern stations reach their minimum in January. In addition, areas with higher snowfall Normals, such as the Northeast and high-altitude regions in the West, tend to reach their climatological coldest day much later, which is likely because of the increased reflection of solar radiation at Earth’s surface due to the presence of snow cover.

Temperature Normals are important indicators used in forecasting and monitoring by many U.S. economic sectors. Knowing the probability of low temperatures can help energy companies prepare for rising heating demand. They are also useful planning tools for the healthcare, construction, and tourism industries. You may want to check the Normals before planning your next event or vacation.

[Average annual extreme minimum temperatures. 1976-2005] Edited for WeatherNation by Meteorologist Mace Michaels
All Weather News
Large Hail, Damaging Winds Possible in the Plains Tonight
Large Hail, Damaging Winds Possible in the Plains Tonight
A strong upper-level low-pressure system movi
24 Mar 2023 12:35 AM
Significant Severe Storm Risk Targets the Deep South Friday
Significant Severe Storm Risk Targets the Deep South Friday
A strong low pressure system will continue to
24 Mar 2023 12:30 AM
Widespread Flood Threat in the Ohio & Mississippi River Valleys
Widespread Flood Threat in the Ohio & Mississippi River Valleys
In addition to severe storms, heavy rain is e
24 Mar 2023 12:25 AM
Strong Storms & Flooding Target the Midwest
Strong Storms & Flooding Target the Midwest
With the jet stream focused over the Midwest,
24 Mar 2023 12:20 AM
Winter Storm System to Hit the Upper Great Lakes this Weekend
Winter Storm System to Hit the Upper Great Lakes this Weekend
Another low pressure system moving through th
24 Mar 2023 12:15 AM
Record Heat to Finish Out the Week in the Southeast Before Weekend Turns Stormy
Record Heat to Finish Out the Week in the Southeast Before Weekend Turns Stormy
A ridge of high pressure in the Gulf of Mexic
24 Mar 2023 12:10 AM
Tornado Touches Down in Los Angeles area Wednesday Afternoon
Tornado Touches Down in Los Angeles area Wednesday Afternoon
CALIFORNIA - A tornado touched down in the Lo
24 Mar 2023 12:05 AM