Hiouchi has a warm-summer mediterranean climate (Csb) typical of coastal California with moderate temperatures year-round consisting of mild to warm summers and cool, very rainy winters.
Climate data for Hiouchi, California 459ft(140m) (1981-2010)
The Census reported that 301 people (100% of the population) lived in households, 0 (0%) lived in non-institutionalized group quarters, and 0 (0%) were institutionalized.
There were 143 households, out of which 29 (20.3%) had children under the age of 18 living in them, 73 (51.0%) were opposite-sex married couples living together, 11 (7.7%) had a female householder with no husband present, 5 (3.5%) had a male householder with no wife present. There were 4 (2.8%) unmarried opposite-sex partnerships, and 1 (0.7%) same-sex married couples or partnerships. 49 households (34.3%) were made up of individuals, and 20 (14.0%) had someone living alone who was 65 years of age or older. The average household size was 2.10. There were 89 families (62.2% of all households); the average family size was 2.66.
The population was spread out, with 52 people (17.3%) under the age of 18, 9 people (3.0%) aged 18 to 24, 55 people (18.3%) aged 25 to 44, 116 people (38.5%) aged 45 to 64, and 69 people (22.9%) who were 65 years of age or older. The median age was 54.2 years. For every 100 females, there were 104.8 males. For every 100 females age 18 and over, there were 93.0 males.
There were 166 housing units at an average density of 286.3 per square mile (110.5/km2), of which 143 were occupied, of which 100 (69.9%) were owner-occupied, and 43 (30.1%) were occupied by renters. The homeowner vacancy rate was 1.0%; the rental vacancy rate was 4.3%. 214 people (71.1% of the population) lived in owner-occupied housing units and 87 people (28.9%) lived in rental housing units.
^Durham, David L. (1998). California's Geographic Names: A Gazetteer of Historic and Modern Names of the State. Clovis, Calif.: Word Dancer Press. p. 77. ISBN1-884995-14-4.