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Weather in Chicago in May 2021 (Illinois)

Your Guide to Ontario Weather Learn about typical Ontario Weather. Ontario is the second largest province in Canada. It has forests covering about 65 percent of its land, and water covering another 20 percent. Ontario’s weather changes with the seasons, so plan accordingly if you plan to spend time there.

Ontario’s year-round climate is termed “continental,” which means that the winter weather is cold and snowy and the summer weather is hot and humid. Spring and autumn are milder versions of summer and winter. The Great Lakes control some of the weather patterns, preventing drastic temperature changes and causing more precipitation near the water.

Springtime in Ontario can be cool and rainy. In early spring, daily highs tend to be in the lower 50s. But by the end of spring, temperatures might climb close to 70, or even higher. Rainfall during March typically approaches three inches, but in April and May the rainfall tends to dwindle.

Although Ontario weather tends to be somewhat unpredictable, it’s best to plan on hot and humid weather during the summer months. Ontario locations away from the Great Lakes tend to be hotter than the areas bordering the water. Heat waves are not out of the question either. As summer advances, it’s typical for the weather to become even more hot and humid.

Days get shorter in autumn, which also brings cool and crisp days. The leaves on deciduous trees turn color and eventually fall. Wet weather tends to return as well, and in southern parts of Ontario, rain will fall. In northern Ontario, snow isn’t out of the question, even in October. Meanwhile, November is the wettest month of autumn.

Winters can be bitterly cold in Ontario. Those living in this province tend to be hearty enough to withstand the cold and snow, which comes frequently during the winter. In many areas, such as London, Ontario, the temperature rarely rises above freezing during the winter. Temperatures often drop into the subzero digits thanks to the Arctic air currents that blow through the province regularly.

The areas closest to the Great Lakes often get a little reprieve from winter weather due to the heat given off by the water. It’s not unusual for these areas to have milder winters than those experienced in northern Ontario.

A snow belt exists in Ontario, stretching along the southern and southeastern sides of the Great Lakes. Some areas had a record snowfall in December of 2010, receiving more than 40 inches of snow in 48 hours.

May in Chicago: Weather and Event Guide
What Are the Seven Weather Elements? Discover more about the seven elements that determine the weather we enjoy or dread: temperature, humidity, air pressure, precipitation, wind, cloud formation and sunlight. The weather plays a part in everything we do, from the way we live our everyday life to the choices we make for our vacations. In many areas, the weather can vary widely from one day to the next, with the conditions on some days being quite destructive. Have you ever wondered what affects the weather and what makes it change so much?

Several different factors affect the weather, from daily developing conditions to long-term trends. Temperature, humidity, atmospheric pressure, precipitation, wind, cloud formation and sunlight are the key elements that determine weather, and each component affects the world around us in a different way.

Simply put, the temperature is a measure of how hot or cold the atmosphere is at any given moment. It’s one of the most obvious weather conditions that people immediately notice — no special equipment required unless you want to know the exact temperature reading. Meteorologists rely on thermometers to measure temperature in degrees — Fahrenheit in imperial measurements and Celsius in metric measurements. Scientists also use other measurement scales, such as Kelvin and Rankine.

Temperature readings follow a logical standard, with higher degree measurements indicating higher levels of warmth. When skies are clear, the temperature can vary widely, depending on seasonal variations (position of the Earth and the sun), time of day, wind velocity and other factors. On cloudy days, the cloud cover also works to moderate temperatures.

Atmospheric pressure, also known as barometric pressure or simply air pressure, is a measurement of the pressure exerted by the weight of the atmosphere in a particular area. The pressure of the atmosphere doesn’t necessarily have a direct effect on the weather at any given moment, but it offers an accurate method for predicting what the weather conditions are likely to be within a certain timeframe. Higher atmospheric pressure generally signals fair weather, while falling pressure can indicate that a storm is coming.

Meteorologists use barometers to measure the air pressure in an area. Monitoring rising and falling pressure on a barometer can help forecasters make educated predictions about the type of weather that is on the horizon as well as help meteorologists spot trends or abrupt changes in conditions.

Humidity measures the amount of moisture in the air. Water vapor levels can rise and fall in the atmosphere depending on various conditions. In cooler weather, humidity in the air tends to be lower, while humidity often rises when the weather is warmer. Meteorologists use a hygrometer to measure relative humidity, which is the percentage of moisture in the air compared to the highest amount of water the atmosphere can hold at that specific temperature. 

The closer the relative humidity gets to 100%, the more likely you are to see precipitation like rain, snow or fog. Another measurement of humidity that is familiar to many people is dew point, which occurs at the temperature the current amount of water vapor in the air would equal 100% relative humidity. The closer the dew point is to the current temperature, the higher the relative humidity climbs.

When the relative humidity reaches 100% or when the dew point matches the current temperature, condensation of moisture occurs in the atmosphere. We call this condensation precipitation, and it can take many different forms. The moisture could fall to the ground in the form of rain, and if the atmospheric conditions are right, thunderstorms could form. During some storms, ice crystals known as hail clump together and fall. Other storms may create other types of dangerous and damaging conditions, such as lightning and tornadoes.

If the air is cold enough, the precipitation can fall to the ground as snow, sleet or freezing rain. Water vapor can also condense as a low hanging cloud near the ground’s surface, forming what we call fog.

Cloud cover works with the sun to determine weather conditions from day to day. Clouds are formations of water vapor in the sky that can take different shapes and have different effects on the weather. The highest, wispiest clouds consist of noctilucent, cirrus, cirrocumulus and cirrostratus clouds. Noctilucent clouds form more than 85,000 feet up in the mesosphere and don’t have anything to do with weather. Cirrus clouds are generally associated with fair weather unless they are followed by the formation of cirrostratus clouds, which typically form a day or so before rain or snowstorms. Cirrocumulus clouds are more common in fair, cold weather during the winter months. 

Clouds at mid-level altitudes of 7,000 to 23,000 feet include altocumulus and altostratus. Altocumulus clouds look a bit like storm clouds with darker, grayish sections, so it’s not surprising that they often indicate you can expect a thunderstorm later in the day. Altostratus clouds, which cover broader stretches of the sky and look gray or blue-gray, usually indicate looming rain or snowstorms. 

Lower clouds form up to 7,000 feet above the ground and consist of stratus, stratocumulus and nimbostratus clouds. Stratus clouds are gray, wispy, very low to the ground and sometimes have rain falling from them. Drizzling rain is common with stratocumulus clouds, which fits their lumpy, gray appearance. Dark gray nimbostratus clouds often cover large sections of the sky and are a source of ongoing rain or snow.

As air moves parallel to the surface of the planet, it creates wind. Caused when the sun unevenly heats the Earth, these air currents move from high-pressure areas to low-pressure areas, which generally leads to west to east movement in the northern hemisphere and east to west movement in the southern hemisphere. The effect of pressure zones on air currents explains why winds often blow more strongly when weather fronts and changes are approaching.

At higher elevations in the atmosphere, winds can blow at much faster speeds than they do at the surface. These high-level winds can blow storm systems and areas of lower pressure across the surface of the atmosphere, causing changing weather patterns in different places along their path.

Sunlight isn’t actually one of the six official elements of weather, but the sun certainly plays a key role in atmospheric conditions all over the planet. Earth revolves around the sun, and that movement combined with the tilt of the planet on its axis leads to the different seasonal conditions we experience, depending on where we live in the world.

Earth tilts on its axis at a diagonal angle toward the sun as it revolves around it. Throughout each yearly revolution, the hemisphere that tilts closest to the sun experiences warm summer months, while the hemisphere pointed away from the sun experiences colder winter weather. These seasonal variations affect everything from typical daily temperatures to weather conditions that are tied to temperature, such as hurricanes and blizzards.

September in Chicago: Weather and Event Guide Chicago has plenty to offer visitors in September. As summer gives way to cooler weather, the city comes to life with food-, art-, and music-centered events. Labor Day marks the official end of Chicago's busy summer tourist season, but that May in Chicago: Weather and Event Guide
Chicago, IL Monthly Weather - AccuWeather Get the monthly weather forecast for Chicago, IL, including daily high/low, historical averages, to help you plan ahead. 100° 88° 76° 64° 52° May. Chicago May Weather, Average Temperature (Illinois, United States) May Weather in Chicago Illinois, United States Daily high temperatures increase by 9°F, from 62°F to 71°F, rarely falling below 50°F or exceeding 83°F. Daily  Chicago Clinches Wettest May on Record - WeatherNation
How is the Weather in Chicago in May 2022? - Free Tours by Foot HOW COLD IS CHICAGO IN MAY? The temperatures reach between 66 °F and 74°F (19-23 °C), with an average high of 70 °F (21°C). On the other end, the average low  Chicago, Average Weather May The average daily temperature for Chicago in May is a warm 21°C, but this can drop to 9°C on average. Sunshine Long sunny days are beginning to be seen again in  Weather Chicago - Chicago May Go All Of January February Without Snow ...
May weather forecast and climate Chicago, IL Weather in May The last month of the spring, May, is an enjoyable month in Chicago, Illinois, with average temperature fluctuating between 61°F (16.1°C) and  Chicago IL Weather in May - Current Results The temperature usually rises every day in May to over 50 degrees Fahrenheit (10 degrees Celsius) in Chicago. The city averages 8 days this month when the  May 5th strange weather pattern downtown CHICAGO - YouTube
May Normals for Temperature and Precipitation for Chicago May Normals for Temperature and Precipitation for Chicago ; 30, 75.4, 55.2, 65.3, 3.3 ; 31, 75.7, 55.6, 65.6, 3.1  Weather in Chicago in May 2022 (Illinois) Detailed ⚡ Chicago Weather Forecast for May 2022 – day/night 🌡️ temperatures, precipitations – Weather in Chicago in May 2021 (Illinois) Detailed ⚡ Chicago Weather Forecast for May 2021 – day/night 🌡️ temperatures, precipitations – Weather Chicago in May 2023 - Chicago weather in May ; Temperature May, 14.5°C | 58.1°F ; Temperature May max. 18.5°C | 65.3°F ; Temperature May min. 11.6°C | 52.8°F ; Precipitation / Rainfall 

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