I like the 450-word composition in cloudy weather.

In life, we sometimes worry about not observing the weather, because if we know the weather like the back of our hand, we can decide whether to take an umbrella or wear long sleeves or short sleeves.

In the science of the fourth grade last semester, we learned how to observe the weather, and we can quickly grasp whether it is raining or sunny, cloudy or cloudy.

First of all, the first lesson is that we care about the weather, mainly to learn what the characteristics of the weather are, and also to learn the patterns and symbols in the weather, so that we can have a deeper understanding of the weather. Wind, clouds, fog, rain and temperature are all important knowledge points of weather, which can be divided into four categories: sunny, rainy, cloudy and snowy.

The second lesson is the weather calendar. We learned how to remember the weather. On the weather calendar, we should remember the wind speed, weather, temperature and precipitation. I also learned how to draw a weather histogram. From the first day to the last day of recording, the temperatures of all kinds of weather should be connected in a line.

In the third lesson, we learned how to measure the temperature. During the measurement, I found that the indoor and outdoor temperatures can't be the same. First of all, we should take a thermometer and stay indoors and outdoors for the same time in order to make an accurate comparison.

The fourth lesson is about wind direction and speed. We must first make a weather vane, and the most important thing in the weather vane is the wind direction. Only by installing a wind map can we accurately judge what wind it is.

The fifth lesson is about the measurement of precipitation. First, make a settling device, just a cup, a piece of double-sided tape and a piece of paper.

First, write the scale on the paper, then stick the paper on the cup with double-sided tape, and a dehydration device is ready. Then use a watering can to simulate rainfall, pay attention! Be sure to face the scale and face yourself!

The sixth lesson talks about cloud observation, including stratus, nimbostratus, cumulus, cumulonimbus and cirrus. Clouds can let us know about rain, so clouds are very important, but sometimes clouds can also be used for appreciation. Clouds are beautiful!

Science lets me know how important the weather is!