In March 2012... (warm, average, temperature, Chicago)

[tvdxer]

March in Duluth, MN (39.3F) was +0.6F the normal March average temperature for Ottumwa, Iowa (roughly 400 miles south of it).

March in Minneapolis, MN (48.3F) was +0.2F the normal March average for Fayetteville, AR, over 600 miles to the southwest of it.

March in Chicago, IL (53.5F) was roughly equivalent (-0.5F) to an average March in Memphis, TN and almost exactly the same temperature as an average Clarksdale, MS March...about 590 miles south of it.

March in St. Louis, MO (61.1F) was +0.5 warmer than a Biloxi, MS March, and roughly the same temperature as a March in New Orleans - about exactly 600 miles south.

[Patricius Maximus]

Those stats bring the anomalies home, so to speak. Neat.

[nei]

Chicopee, MA (45°F) was the same as Assateague Island National Seashore, Maryland 360 miles south

[coped]

Here in Charlotte, NC, I put my jacket away in February and have needed it only once since.

[tvdxer]

Some others, further north:

The average temperature in International Falls (38.2F) was roughly equal to the average temperature for March for Des Moines (but not Des Moines airport), 490 miles to the south.

The average temperature in Winnipeg for March (36F) was roughly equal to the average temperature for March for Sioux City, IA, over 500 miles south of it.

The average temperature for Red Lake, Ontario - the "end of the road" or northernmost site accessible in the province - was 32F, equivalent to an average March in Estherville, Iowa, about the same distance from Winnipeg to Sioux City.

The abnormal warmth in March ended at a certain point north which is hard to find given the low density of weather stations in Manitoba and especially far northern Ontario. Thompson reported a monthly mean temperature of only 6F above normal.

[ilovemycomputer90]

This March was pretty much equivalent to an average April here. Or it was about the same as an average March in Richmond, VA - 370 miles south.

This past winter was almost equivalent to an average winter in the DC/VA/MD region.

[wavehunter007]

Much of the west-central, central, and eastern part of the USA mainland has had similar high temp anomalies this past March:

Here on the East Coast:

March in Portland, ME (41.1 F) was only 1 F cooler than the normal March average for NYC …325 miles to the south.

March in Bridgeport, CT (47.1 F) was only 1 F cooler than the normal March average for Richmond, VA …400 miles to the south.

March in Richmond, VA (58.3 F) was only 1 cooler than the normal March average in Savannah, GA…450 miles to the south.

March in Savannah, GA (66.9 F) was only 1 cooler than the normal March average in Orlando, FL…300 miles to the south.

March in Orlando, FL (72.8 F) was 0.2 F warmer than the normal March average in Miami…250 miles to the south.

[tvdxer]

I found some data for Canadian locations further north...

Armstrong, Ontario (50.3N) was about average for a typical Suring, Wisconsin March, 370 miles to the south.

Landsdowne House, Ontario (52.3N) was +0.3F above a typical Brimson, Minnesota March, 380 miles to the south.