![]() Average sea level pressure is 1013.25 millibars (29.92 inches of mercury, 760 millimeters of mercury).Īlthough shown here as "windspeed" this calculator could just as well be used to convert "boatspeed." For more information about wind and wind scales go here.įor more information about time ( UTC, GMT, Z ) go here. Humidity is the ratio of the actual moisture content of the air at a specific temperature to the maximum amount that the air could hold at that temperature.īarometers measure air pressure in "millibars" (mb), "inches of mercury" (in) or "millimeters of mercury" (mm). Relative Humidity Calculator Temperature = Note: air temperature must be greater than 80 ☏ ( 27 ☌ ) and relative humidity must be higher than 40 percent. ![]() Heat Index is the temperature that it "feels like" based on actual temperature and humidity. For more information about wind chill go here. The "new" wind chill reflects the 2000-2001 National Weather Service update to the original ("old") 1945 index. Wind Chill is the temperature that it "feels like" based on actual temperature and wind speed. Wind Chill Calculator Air Temperature (☏) = Wind Speed (MPH) = 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.For more information about temperature go here. 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. Therefore, the stronger the winds, the colder the air will feel. ![]() As wind speeds increase, the amount of heat lost from your body also increases. where: ET equivalent temperature (degrees Celsius) WCF wind chill factor (Watts per square metre) SQROOT square root function W wind speed (Km/hr) T air temperature (degrees Celsius) (Source: Weather University of Waterloo ) Online calculators for humidex and widchill factors. 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. ![]() humidity, and air movement can subjectively appear similar. 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. chill equivalent temperatures as a function of wind speed and air temperature: WCT. 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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