Climate.
The word for average weather conditions over time is climate.
I believe you are looking for the word climate.
No, the word 'climate' is not an adverb. It is a noun that refers to the average weather conditions in a particular region over a long period of time.
Weather-over-a-period-of-time.
Climate.
Climate
The weather, is another word for Study of the Atmosphere. Weather is what the atmosphere is doing at a certain time.
The noun 'weather' is a common, uncountable, abstract noun, a word for the state or conditions of the atmosphere at a given place and time; a word for a concept. The word 'weather' is also a verb and an adjective.
The root word of climatic is "climate," which refers to the typical weather conditions in a particular region over a long period of time.
The Old English word was weder.Other similarities are:Proto-Germanic *wedrąWest Frisian waarDutch weerLow German WederGerman WetterDanish vejrSwedish väder.
Weather is the set of process set in a specific atmosphere. Weather is opposed the word climate, which is the average atmospheric conditions over longer periods of time. If the word weather was used without qualification, it mostly mean the main weather of the earth. Differences in weather most often results from temperature differences from one place to another. On the other hand, we refer to a climate, by saying it is either cold, mild or hot.
You may be thinking of the word "seasonal".