Annual Weather Summary: November 2017 to October 2018 Winter will be colder than normal, especially in the south, with the coldest periods from late November into early December and in late December, mid-January, and early February.
It is an adjective that serves to modify nouns. Nouns modified by every are singular and must be written in such a manner. For example: Every <person> involved in the crash died. The reason for this singularity is because the word every literally means each, and refers to a single entity. Moreover, another reason for this is every is derived from the terms everything and everyone.. Notice here that obviously thing and one are singular objects.
My brother is a nutritionist. My sisters are mathematicians. See the section on Plurals for additional help with subject-verb agreement. The indefinite pronouns anyone, everyone, someone, no one, nobody are always singular and, therefore, require singular verbs. 1  Everyone has done his or her homework.