The movement of thunderstorms, called propagation, also is very important in determining the actual amount of rainfall in any one location. The slower the movement of thunderstorms, the higher the rainfall potential in one area. These examples show how relative humidity can be quite misleading. In general, assuming the dewpoint or absolute humidity does not change, the relative humidity will be highest in the early morning when the air temperature is coolest, and lowest in the afternoon when the air temperature is highest.
While dewpoint is a more definitive measure of moisture content, it is the relative humidity that commonly is used to determine how hot and humid it "feels" to us in the spring and summer based on the combined effect of air temperature and humidity. This combined effect is called the " Heat Index. In the winter, there is another index we use to determine how cold our bodies feel when we are outside.
This index combines the effect of the air temperature with the speed of the wind. When it is cold outside and the wind is blowing, the wind carries away heat from our bodies faster than if the wind was not blowing. This makes it feel colder to us.
Therefore, the stronger the wind is in the winter, the colder it feels to us and the lower is the wind chill index. If the heat index is very high or the wind chill index is very low, then we must take safety measures to protect our bodies from possible effects of the weather, including heat exhaustion, sunstroke, and heat stroke in the summer, and frostbite in the winter.
Please Contact Us. Please try another search. Multiple locations were found. Please select one of the following:. Location Help. News Headlines. Customize Your Weather. Privacy Policy. Discussion on Humidity Weather. Current Hazards. Local Radar. Rivers and Lakes. Climate and Past Weather. Weather Story. Weather Map. They use about 75 percent less energy and emit 90 percent less heat. Leaky ducts can cut into air-conditioning efficiency. Ductwork must be balanced between the supply and return sides of the system in order for it to work safely and efficiently, so making a repair in one section can cause a problem in another.
Leak-prone areas include the return plenum; where branch ducts meet the trunk line; and where ducts attach to outlets. Also, insulate ducts that run through a hot attic with a blanket of R fiberglass insulation.
Unless the duct repairs are minor, it's wise to leave them to a HVAC pro. While the contractor is on site checking your ducts, have him tune up the air-conditioning unit by cleaning filters, unplugging coils, unblocking drains and lubing the fan. The places where cold air infiltrates in winter are routes for hot air in summer.
And what's worse, hot air is often accompanied by high humidity, making you even more uncomfortable. Armed with a flashlight, exterior-rated silicone caulk and a couple cans of expanding foam insulation, hunt down and seal all leaks.
Concentrate on the attic, basement and crawl space; pay close attention to anything that passes through a ceiling or wall, such as ductwork, electrical or plumbing conduits and kitchen and bath vents.
Other common leaky spots are around windows and doors. If you can rattle a window, it's leaking. Seal it with weather stripping. Cookie banner We use cookies and other tracking technologies to improve your browsing experience on our site, show personalized content and targeted ads, analyze site traffic, and understand where our audiences come from.
By choosing I Accept , you consent to our use of cookies and other tracking technologies. By David Dobbs. Pinterest Email Pocket Flipboard. How to Set Your Thermostat to the Right Setting Typical air-conditioning settings for a programmable thermostat at different times of day: 6 a. Tip 3: Use a Fan A fan, which costs two to five cents per hour to operate, will make a room feel 4 to 6 degrees cooler. Benefit : Ceiling fans can decrease your cooling bill by up to 15 percent, while a whole-house fan can slash it by 50 percent.
Tip 4: Practice "Texas Cool" "Texas cool" is a morning and evening routine that takes advantage of cool outdoor temperatures at night and keeps the heat at bay as much as possible during daylight hours. It's very simple to do: At night when the temperature drops, open windows and bring in cool air with window fans or a whole-house fan.
As soon as the sun comes up or the air starts to heat up, shut the windows and shades and keep doors closed. Thanks for signing up! Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below.
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Please try again. Something went wrong on our side, please try again. Show references Office of Patient Education. The heat is on! Precautions for people with diabetes during the summer months. Mayo Clinic, Auerbach PS, et al. Dehydration and rehydration. In: Auerbach's Wilderness Medicine. Elsevier; Accessed Oct.
Centers for Disease Control and Prevention. Dietary reference intakes for electrolytes and water. National Academies of Science, Engineering, and Medicine. Franklin BA. Exercise prescription and guidance for adults.
Bardosono S, et al. Pregnant and breastfeeding women: Drinking for two. Sterns RH. Maintenance and replacement fluid therapy in adults. Gordon B. How much water do you need. Academy of Nutrition and Dietetics. Department of Agriculture.
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