Multiple choice Which of the following is an appropriate definition of 'weather'? Changes in atmosphere over a year Conditions of atmosphere over a short period of time Conditions of atmosphere over many years Conditions of atmosphere during summer Reveal answer Fill a bubble to check yourself B Correct answer Explanation Weather - Condition of atmosphere over a short period of time is defined as weather. Climate - Condition of atmosphere over relatively long period of time, say for 25 years is defined as climate.