Skip to Main Content

Why it’s so hard to forecast a white Christmas

No matter how you might feel about cold weather, who doesn’t dream of a white Christmas?

Every December, forecasts abound on the probability of a snow-filled holiday.  Austin Pearson, Purdue Extension director in Tipton County and climatology expert, said it’s almost impossible to predict Christmas snowfall more than three days in advance. Even 24 hours before can be dicey, he added.

“Snowfall is one of the most difficult things to forecast,” Pearson continued. “I remember when I was an undergraduate at Purdue and we were forecasting for the Indiana Department of Transportation. Predicting precipitation was one of the most difficult things we had to do.”

snow on the field

Part of the reason snowfall and other forms of precipitation are so challenging to forecast is that meteorologists rely on a series of different models and statistics and use those to calculate the probability of certain weather outcomes. Models pull observations, measurements, and data in real-time from weather stations across the United States. They also extract historic regional data. All of this is used to calculate probabilities about incoming storm systems, temperatures, and precipitation.

“Models change and they change quickly,” Pearson said. What’s challenging about forecasting storm systems and perception is that the slightest variation in temperature or other weather patterns can turn rain into snow or vice versa. “It’s temperamental,” he laughed.

While Pearson can’t determine whether Indiana will enjoy a white Christmas this year, he’s noticed some recent climate trends in Indiana over the past several years that don’t portend a blanket of snow on Christmas morning.

“It’s always very difficult to say but in terms of general trends, we’ve been seeing a smaller number of large snowfall events but a larger number of smaller snowfalls. If we continue with general warming trends, we are going to see more rain in Indiana over our winters,” Pearson explained.

But don’t despair just yet, Pearson continued. One of the models forecasters are currently tracking predicts sub-freezing temperatures around Christmas, which could mean snow. Of course, another, model, with higher probability, is signaling 50-degree temperatures during the week of December 25.

“There is still that potential for snow around Christmas, but getting the track and model right is difficult,” Pearson said. “My magic ball is limited.”

Featured Stories

dr heinsohn with award recipients
Dr. Kathy Heinsohn Receives 2024 John Osmun Award

On January 31, 2025, Dr. Kathy Heinsohn received the 2024 John V. Osmun Alumni Professional...

Read More
a man smiling
Graduate Student Spotlight: Gideon Ajibola

Gideon Ajibola is a Ph.D. student in the Purdue Animal Sciences Department, and he also received...

Read More
Vidya Nagaraju and Kingsly Ambrose measure the size and shape distribution of particles
Particle science innovations focus on improving grain facility safety

Frequent explosions plagued the U.S. grain industry until the Occupational Safety and Health...

Read More
Purdue TWS president Celia Parton and master's student Emma Johnson accept the plaque for North Central Region Student Chapter of the Year at the Midwest Fish and Wildlife Conference.
Student Chapter of the Wildlife Society Named North Central Region Chapter of the Year

The Purdue student chapter of The Wildlife Society was named as the North Central Region’s...

Read More
a man smiling with a cake
Honoring Barry Delks' Legacy

A retirement celebration for Barry Delks was held on January 31, honoring his career dedicated to...

Read More
Memorial Mall
U.S. farmers retain optimistic outlook for 2025 despite ag trade uncertainty

U.S. farmers began 2025 with an optimistic outlook, as the January Purdue University/CME Group Ag...

Read More
To Top