Leech Lake has a humid continental climate (Köppen Dfb), bordering on a dry-winter humid continental climate (Köppen Dwb).

[5] As of the census[1] of 2000, there were 384 people, 155 households, and 119 families residing in the township.

There were 285 housing units at an average density of 12.3 per square mile (4.7/km2).

There were 155 households, out of which 25.8% had children under the age of 18 living with them, 64.5% were married couples living together, 6.5% had a female householder with no husband present, and 22.6% were non-families.

18.1% of all households were made up of individuals, and 8.4% had someone living alone who was 65 years of age or older.