Weather Overview

Weather Changes

• Weather changes from day to day and from season to season.

• The weather may be warm and sunny on Monday and then cold and rainy by Wednesday.

• Weather changes dramatically from Summer to Winter.

Why Does the Weather Change From Season to Season?

• The weather changes from season to season because different areas of the Earth are tilted towards the sun.

• Some parts of the Earth get more direct sunlight at different times which causes warmer temperatures.

• Some parts get less direct sunlight which causes cooler temperatures.

The Effects of Sunlight• Our weather is caused by two

things: the sun and moisture in the air.

• These two things together can form clouds, make rain and thunderstorms, and cause winds to blow. Without the sun and moisture in the air, our earth would have no weather at all.

• In fact, there would be no people or plants either.

(http://home.houston.rr.com/amandaswork/What_Causes_Weather.htm)

What is the Weather Like Each Season?

• Spring

• Summer

• Fall

• Winter

Spring(March, April, May)

• Warm Temperatures Ranging from 50s-70s (Some days may be cool, some may be warmer)

• Chances of rain and thunderstorms• We usually wear t-shirts, long pants, or lighter

clothing this time of year. Light jackets may be necessary.

Summer(June, July, August)

• Temperatures are HOT- usually in the 80s and 90s

• Chances of rain and thunderstorms

• We usually wear t-shirts, shorts, and lighter colored clothing to keep us cool this time of year.

Fall(September, October, November)

• Cooler Temperatures ranging from 50s-70s• Leaves are changing and falling off of the trees• Chances of rain and thunderstorms• We usually wear light jackets, sweatshirts, and

jeans. (Think football weather)

Winter(December, January, February)

• Cold Temperatures (40s, 30s, and possibly lower)

• Chances of Snow, Sleet, & Ice

• We bundle up this time of year in sweaters, coats, gloves, and scarves.

Weather Observations

• Temperature• Air Pressure• Humidity• Wind Direction• Wind Speed• Precipitation

What is Temperature?

• Temperature is how hot or cold something is.• We measure temperature using a thermometer.• We measure temperature in degrees Fahrenheit or

Celsius.

What does Air Pressure Tell Us?

• Air pressure tells us what the weather will be like.

• Low pressure= Cloudy & Stormy

• High pressure= Clear & Dry

It’s Getting Humid in Here

• Humidity is moisture in the air.

• When the air becomes saturated (contains as much vapor as possible) and continues to cool, water condenses into droplets and gives off a lot of heat in the process.

• (http://www.stuffintheair.com/explain-humidity.html)

Why do we Need to Know About Wind Direction and

Wind Speed?

Wind Direction

• We need to know which way the wind is blowing so we can forecast what the weather in our area will be like.

• If we know where the weather is coming from, we will know what to expect.

Wind Speed

• This is how fast the wind is blowing.

• It is measured by an anemometer.

• Why would we need to know how fast the wind is blowing?

Precipitation

• Precipitation is water in the form of rain, sleet, snow, or hail that condenses in the atmosphere and falls from the sky.

Trivia Time

Why do we need to

know about the

weather?

How do we measure the temperature?

How do we measure air pressure?

How do we measure humidity?

How do we measure wind speed and wind

direction?

How do we measure precipitation?

What have you learned about

weather?