Every day scientists all over the world record weather conditions – temperature, humidity, wind direction and speed, rainfall, snowfall, etc. Many sources say that such records started on a global scale in 1880.
Averaged means that scientists look at weather records for the last 30 years. Then they calculate typical conditions over that period of time.
Climate or weather conditions can be calculated for different time periods. For example, climate for 1978-2017 or 1900-1929.
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