During the month of March, the U.S. as a whole was slightly warmer and drier than normal — see the national temperature and precipitation state of the climate report. The northern tier of the country was particularly warm, causing a great deal of snow melt during the month. At the beginning of the month, snow was present over the entire northern tier of the country, along the Appalachians, the central and southern Rockies, the Sierra Nevada, and the Cascades — amounting to 48 percent of the contiguous United States. By month's end, only 11 percent of the country had snow on the ground — northern New England, the higher terrain of the Northeast, and the mountainous West. During March, the contiguous U.S. snow cover extent was 1.7 million square km (0.7 million square miles) and ranked as the 29th largest (16th smallest) March snow extent since the satellite record began in 1966. The North American snow cover extended to 14.97 million square km (5.8 million square miles), and ranks as the 37th largest (8th smallest) March snow extent on record.

The northeastern U.S. and southern Canada in particular had very little snow during March. For the first time on record, both Syracuse and Rochester, New York received no snowfall for the month. The montly average snowfall for these cities is 18.2 inches (46.2 cm) and 15.6 inches (39.6 cm), respectively. In Canada, unusually low snow accumulations were widespread. Toronto averages 9 inches (23 cm) of March snow, but for the first time since 1845, no snow was observed in the city. Ottawa, Montreal, and Calgary all experienced much below average snowfall for the month. Light snow accumulations during March across these regions is consistent with the ongoing El Niño which has been present for the entire winter season — see the Climate Prediction Center for additional El Niño information.

The Arctic sea ice reached its annual maximum extent on March 31st at 15.25 million square km (5.89 million square miles). This was the latest date for a maximum Arctic ice extent since the satellite record began in 1979; the previous latest date of maximum extent was March 29, 1999. Cold weather and northerly winds over the Bering and Barents Seas were associated with the unusual growth throughout the month. The March average extent was 15.1 million square km (5.83 million square miles). This is 0.65 million square km (0.25 million square miles) below the 1979–2000 March average. The late date of the maximum extent is not expected to have a large impact on summer ice extent. Ice that forms during March tends to be thin and will melt quickly with spring warming. Please see the Arctic Sea ice analysis by the National Snow and Ice Data Center for additional information.

At the mid-point of March, the Great Lakes had a record low ice extent. The region experienced temperatures which were above-normal or near-normal every month since November, the period when the ice typically forms and is maintained. March also brought temperatures that were much above-average, and melted most of the ice that had previously formed. According to The Canadian Ice Service, on March 19th, the ice coverage on all of the Great Lakes reached its lowest extent on that day since 1973. On this date, typically 31 percent of the lakes are ice covered, but this year around 3.5 percent had ice — confined to the northern bays of Lake Superior and Lake Huron.

A strong storm brought heavy snowfall from the Rocky Mountain Front Range across the Southern Plains on March 19th through 22nd, creating a white start to the beginning of Spring. The snowfall coupled with strong winds caused near-blizzard conditions in Oklahoma, Texas, Arkansas, and Missouri. According to the Associated Press, at least five deaths in four states were attributed to the storm. The storm brought over 20 inches (51 cm) of snow to portions of Wyoming, Colorado, and New Mexico. Accumulations over 10 inches (25 cm) were common across the rest of the Southern Plains, with portions of Missouri, Kansas, and Arkansas receiving over a foot (30 cm). The month of March has been one of extremes for Oklahoma City, the day before the snow began on the 20th, the city experienced a high temperature of 72 degrees F (22 degrees C). This storm also topped off a very snowy season for the region. Oklahoma City had its fifth snowiest winter with 23.3 inches (59 cm) of snowfall, and Wichita Falls, TX had its snowiest season with 16.6 inches (42 cm).

Citing This Report

NOAA National Centers for Environmental Information, State of the Climate: Monthly National Snow and Ice Report for March 2010, published online April 2010, retrieved on October 4, 2022 from https://www.ncei.noaa.gov/access/monitoring/monthly-report/snow/201003.