A rise in average temperature of a city over decades can indicate what?

Correct answer: Long-term climate trend

The direct answer is C: a rise in average temperature over decades can indicate a long-term climate trend. The key evidence is the time scale. Weather describes a short period, such as today’s temperature, one day’s wind or a single storm. Climate trends are identified by examining observations over many years and checking whether the average changes consistently. Step by step: decades provide a long record; average temperature summarises that record; a sustained rise may indicate a warming climate trend. One observation alone cannot prove a full trend, so scientists also check data quality, location and other explanations. Option A is wrong because today’s weather is only a short-term condition. Option B is wrong because a rain gauge’s direction is not a climate trend. Option C is correct because it matches the long period and average temperature. Option D is wrong because one day’s wind is weather, not a decades-long temperature pattern. Memory cue: “decades plus average” points toward climate trend; “today plus one event” points toward weather.