What Is Climate

Climate is the average pattern of weather a place experiences over many years. Scientists usually measure climate across at least 30 years. If weather is what's happening outside your window today, climate is what a place is generally like throughout the year. Think of it this way: weather is your mood right now, but climate is your personality.

Every region on Earth has its own climate. Some places have hot, dry climates like deserts in Arizona. Other regions have cool, rainy climates like the Pacific Northwest. Climate includes typical temperatures, seasonal patterns, and how much precipitation falls as rain or snow. Scientists observe these patterns over decades to understand what is normal for each location.

Climate forms through interactions among Earth's major systems. The atmosphere carries heat and moisture around the planet. Oceans absorb and release heat slowly, which affects nearby land temperatures. A region's geography also matters. Mountains can block rain clouds, creating dry areas on one side. Distance from the ocean influences how much moisture reaches an area. These factors work together over long periods to create each region's climate.

Evidence shows that climate affects nearly everything in a region. Plants and animals adapt to their local climate over many generations. Humans build homes and grow crops based on expected climate conditions. For example, the Midwest has a climate with warm summers and cold winters. Farmers there plant corn in spring because they can predict when frost will end. Understanding climate helps communities plan for the future and prepare for typical weather patterns.

Interesting Fact: Scientists have found evidence that Earth's climate has changed many times over millions of years. Ice core samples from Antarctica contain tiny air bubbles that reveal what the atmosphere was like up to 800,000 years ago.