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Here are the Sunrise/Sunset times for Duluth, Minnesota and Brownsville, Texas for March 21, April 21, May 21, and June 21:

Duluth will be in blue since it is known for it cold weather.

Brownsville will be in green since it is known for it warm weather.

Duluth, MN June 21 - 5:14am - 9:06pm
Brownsville, TX June 21 - 6:38am - 8:23pm

Duluth, MN May 21 - 5:27am - 8:43pm
Brownsville, TX May 21 - 6:41am - 8:12pm

Duluth, MN April 21 - 6:11am - 8:04pm
Brownsville, TX April 21 - 7:02am - 7:56pm

Duluth, MN March 21 - 7:10am - 7:22pm
Brownsville, TX March 21 - 7:33am - 7:41pm

Note that Duluth has a day that is about 100 minutes longer on June 21 than Brownsville (~ 1 1/2 hours)

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The information for the times is taken from the website:

sunrisesunset.com