Brule Lake Trek Appeals to Many. (1926). Fins, Feather, and Fur: The Official Bulletin of the Minnesota Game and Fish Department, (45), pg 68.

On the whole, the weather was clear and pleasant, although the party trekked through a snowstorm the first day on their trail, and later a sharp biting northwest wind which whirled needles of snow in the air on the trip from Cascade station to Brule. A few ears were frost-bitten on that occasion, but otherwise there were no casualties. The lowest temperature recorded was 22 below zero, a figure anticipated several days in advance by Grand Marais weatherman Olaf Thorvaldsen, whose estimate of the cold was found to be uncannily exact, but each sleeping tent was well bedded with boughs and equipped with a camp stove plenty fully supplied with firewood; all members of the party were equipped with eiderdown sleeping bags or warm blankets, so there was no discomfort in camp regardless of weather.