While nearly 100% of Christmas movies show gorgeous blankets of fresh, fluffy snow on Christmas morning, the reality is only about a dozen states have an average greater than 70% chance of waking up in the snow every year

According to the National Oceanic and Atmospheric Administration (NOAA), a “white Christmas” means there is an inch or more of snow on the ground on Christmas morning

Statistical data were compiled from the averages of several climatological measurements between 1981 and 2010, including daily and monthly normal temperature, precipitation, snowfall, heating and cooling degree days, frost / freezing data, and days with growth degree.They were obtained from observations on almost 10000 official weather stations across the country calculated

While the map shows the climatological probability of snow-covered ground on 25 December shows, actual conditions in any given year can vary widely.It is also important to note that just because there is at least 1 inch of snow on the ground in a given location doesn’t mean that it is fresh snow that would have 1 inch May fall two days earlier, but very cold temperatures kept the snow in place for Christmas Day

For the contiguous United States, the best prospects are in the mountain west, the upper Midwest, and the interior portions of the northeast

“Aspen, Colorado is only one of about a dozen places with a 100% historical chance of seeing a White Christmas,” says NOAA on their White Christmas Historic Site

Other locations such as Crater Lake, Oregon, Steamboat Springs, Colorado, and Marquette, Michigan are also high security locations

Hawaii’s two mountain peaks, Mauna Kea and Mauna Loa, both at an altitude of more than 13At 1,000 feet above sea level, Hawaii is the only two places that have snow annually.And yes, both peaks have fresh snow every year, largely because Hawaii’s rainy season is from October to April and temperatures on the peaks are from November to March regularly fall below freezing

At the summit on Haleakala, Maui, which is over 10000 feet, there may be occasional blankets of snow The Mauna Kea Weather Center has several live camera feeds that you can use to see if the summit is covered in snow

If your looking for snow, you should probably avoid Southern California, lower altitudes of Arizona and New Mexico, and the Gulf Coast region. Berkeley, California, Tempe, Arizona and Orlando, Florida all have a zero percent statistical chance of a white Christmas / p>

Just because you live in a southern state doesn’t mean a white Christmas is impossible

In 1989, people in Charleston, South Carolina woke up to 4 inches of snow on the ground.Technically, there was no fresh snow on Christmas Day, it was left over from the day before as temperatures stayed below freezing on Christmas Eve

North Texas is no stranger to the occasional snowflake at Christmas, but what about further south near the Mexican border? In 2004, Brownsville, Texas picked up 1.5 inches of snow on Christmas morning near South Padre Island picked up 2.5 inches, and Corpus Christi saw 4 inches of powder

Alaska sounds like the most obvious thing on the NOAA list, doesn’t it? Interestingly, Christmas in Alaska isn’t the ideal time for snow

“In many places, October is the snowiest month of the year,” said Brian Brettschneider, a scientific physicist with the National Weather Service. “In the core winter months, the air is so cold that it just can’t hold much moisture in the end many very small snow events ”

In fact, by Christmas, northern Alaska has usually absorbed more than 50% of its seasonal snowfall, again, where climatology plays a major role

“March-May is the climatically driest time of the year,” said Brettschneider. “Although the air can hold more moisture by then and is usually cold enough for snow, there are no storms that could lift the air””

This is unique compared to almost all other regions of the US For example St Louis, Chicago and Pittsburgh take in more than 70% of their seasonal snowfall after Christmas

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Boston, New York, and Philadelphia are over 80% after the vacation. Raleigh, North Carolina, Memphis, Tennessee and Norfolk, Virginia, attract nearly 90% after Christmas

However, it’s Alaska’s remote nature that prevents it from being put on the NOAA list for a White Christmas

“The network of stations in Alaska is too thin for scientists to interpolate with confidence,” says NOAA’s climate website

It simply means that they are excluded from NOAA’s White Christmas map because there aren’t enough weather stations that can provide reliable data to predict “White Christmas Chances” with certainty

White Christmas

World news – USA – There is a current scientific definition of a “white Christmas”

Source: https://www.mercurynews.com/2020/12/24/theres-an-actual-scientific-definition-of-a-white-christmas/