Climates and Weather in Mexico. Mexicoâs weather varies significantly by season and by region. For detailed climate information and a live weather report for specific places, look up the locations you want to visit using our extensive Mexico Travel Guide. See Also: When To Go Mexico (Seasons & Climate).
Confidence votes 28. Annual means once a year, and Semi means partial, so that means that Semiannual means twice a year, once at the beginning and once at the half-year mark.
Definition of semi-. 1  1a : precisely half of: (1) : forming a bisection of semidiameter (2) : being a usually vertically bisected form of (a specified architectural feature) semidomeb : half in quantity or value : half of or occurring halfway through a specified period of time semiannual semimonthly â compare bi-.