Climate

Shelby has four distinct seasons, and is considered an arid climate. Long, severe winters give way to springlike weather anywhere from March to May. Summers can be dry and hot, and the area is prone to lightning, hail, and severe thunderstorms during the summer months.^[12] Fall weather is often unpredictable, with snow falling during October some years, and temperatures well into the 60s °F (10s °C) stretching until the end of November on other years. Due to the city's location just off of the Rocky Mountain Front, wind is a constant.

Climate data is sparse. A weather station operated in the town from the late 1990s shows slightly higher temperatures than nearby towns such as Cut Bank.

2010 census

At the 2010 census there were 3,376 people in 1,245 households, including 717 families, in the city. The population density was 559.9 inhabitants per square mile (216.2/km²). There were 1,371 housing units at an average density of 227.4 per square mile (87.8/km²). The racial makeup of the city was 89.5% White, 0.8% African American, 6.5% Native American, 0.5% Asian, 0.8% from other races, and 1.9% from two or more races. Hispanic or Latino of any race were 3.0%.^[16]

Of the 1,245 households 28.3% had children under the age of 18 living with them, 43.8% were married couples living together, 9.2% had a female householder with no husband present, 4.7% had a male householder with no wife present, and 42.4% were non-families. 37.4% of households were one person and 14% were one person aged 65 or older. The average household size was 2.17 and the average family size was 2.84.

The median age was 40.3 years. 18.9% of residents were under the age of 18; 8.3% were between the ages of 18 and 24; 29.3% were from 25 to 44; 29.9% were from 45 to 64; and 13.6% were 65 or older. The gender makeup of the city was 58.3% male and 41.7% female.

2000 census

At the 2000 census there were 3,216 people in 1,196 households, including 735 families, in the City of Shelby. The population density was 1,018.8 inhabitants per square mile (393.4/km²). There were 1,349 housing units at an average density of 427.3 per square mile (165.0/km²). The racial makeup of the city was 92.48% White, 0.25% African American, 4.17% Native American, 0.40% Asian, 0.25% from other races, and 2.46% from two or more races. Hispanic or Latino of any race were 1.24%.^[17]

Of the 1,196 households 30.9% had children under 18 living with them, 50.8% were married couples living together, 7.5% had a female householder with no husband present, and 38.5% were non-families. 35.5% of households were one person and 16.1% were one person aged 65 or older. The average household size was 2.34 and the average family size was 3.07.

The age distribution was 24.0% under the age of 18, 7.2% from 18 to 24, 29.5% from 25 to 44, 22.9% from 45 to 64, and 16.4% 65 or older. The median age was 39 years. For every 100 females there were 107.4 males. For every 100 females age 18 and over, there were 108.9 males.

The median household income was $29,219 and the median family income was $41,046. Males had a median income of $27,634 versus $19,444 for females. The per capita income for the city was $15,071. About 6.1% of families and 8.6% of the population were below the poverty line, including 8.8% of those under age 18 and 7.5% of those age 65 or over.