Simply match the air temperature on the horizontal axis at the top with the wind speed on the vertical axis along the left-hand side, find where the two values intersect, and that number is your wind chill. The National Weather Service developed the chart below to easily determine the wind chill. When winds are light – 3 mph or lower – the wind chill is not a factor because the thin layer of warm air stays close to your skin. It replaced the prior 1945 Siple and Passel Index, created during a United States Antarctic Expedition from 1939 to 1941. Therefore, the stronger the winds, the colder the air will feel. The Windchill Temperature ( WCT) chart below was created in 2001/2002 by Environment Canada ( EC) and the U.S. As wind speeds increase, the amount of heat lost from your body also increases. HOW COLD CAN TEMPERATURES GET DURING THE COLDEST TIME OF YEAR?Ī thin layer of warm air, produced by body heat, exists just above your skin. That means on a windy day in the winter, the wind chill will be notably lower than the actual air temperature. The wind chill is how cold the air feels on your skin when factoring in the wind for any temperature at or below 50 degrees with wind speeds above 3 mph. In the winter, the feels-like temperature is also called the wind chill. HOW TO TELL THE DIFFERENCE BETWEEN HEAT EXHAUSTION AND HEATSTROKEĬlick here to read more about the heat index and why it's important to your health. The orange areas indicate danger, with muscle cramps and/or heat exhaustion likely if outdoors for too long heatstroke is also possible with prolonged exposure and/or physical activity such as running or biking. The red areas on the heat index chart indicate extreme danger, meaning there’s a serious risk of heatstroke if you spend any significant amount of time outdoors in those conditions. These heat index values were formulated for shady, light-wind conditions, but you should be aware that exposure to full sunshine can increase the "feels-like" temperature by as much as 15 degrees, according to the NWS. There is also a heat index calculator available on this NWS webpage if you prefer to use the dew point instead of relative humidity for the heat index calculation. The National Weather Service heat index chart.
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