Additional factors like activity, clothing, metabolic differences, and pregnancy affect individual temperature impact. Note: The heat index, also known as 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees. Note that heat index values are valued for light wind and location in the shade. Prolonged exercise may result in heat cramps. Constant exposure and activity lead to possible fatigue. Heat indexIn April, the average heat index is estimated at a hot 87.8☏ (31☌). In Williamsburg, the average low-temperature is 64☏ (17.8☌). TemperatureIn April, the average high-temperature marginally rises from 76.3☏ (24.6☌) in March to a still warm 82.6☏ (28.1☌). A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.April, like March, in Williamsburg, Florida, is another warm spring month, with an average temperature ranging between min 64☏ (17.8☌) and max 82.6☏ (28.1☌). On bright days sunglasses that block both UVA and UVB rays should be worn. To the extent possible, limit exposure to the direct sun during these hours. The Sun's UV radiation is most powerful between 10 a.m. Fair-skinned people may get burned in less than 20 minutes. Note: In May, the average maximum UV index of 7 translate into the following recommendations: A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for average individuals. UV indexMay through September, with an average maximum UV index of 7, are months with the highest UV index. SunshineIn Williamsburg, the average sunshine in May is 10.5h. On the last day of May, sunrise is at 6:28 am and sunset at 8:18 pm EDT. On the first day of the month, sunrise is at 6:45 am and sunset at 8:00 pm. DaylightIn Williamsburg, Florida, the average length of the day in May is 13h and 34min. In Williamsburg, during the entire year, the rain falls for 126.6 days and collects up to 9.06" (230mm) of precipitation. Throughout May, 0.91" (23mm) of precipitation is accumulated. Rainfall In May, in Williamsburg, the rain falls for 11.1 days. HumidityIn Williamsburg, the average relative humidity in May is 72%. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity. Young children are generally more endangered than adults, as they usually less sweat. Heat index values are particularly important for children. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Additional factors like differences in body mass, height, and shape, metabolic differences, clothing, and activity influence one's weather impression. Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees. Take into consideration that the heat index values are calculated for shade and light wind conditions. Sustained activity may result in heatstroke. Take extra precautions, as heat cramps and heat exhaustion are possible. Heat indexIn May, the average heat index is estimated at a torrid 96.8☏ (36☌). The average low-temperature, in May, is 68.9☏ (20.5☌). TemperatureIn Williamsburg, the average high-temperature in May is relatively the same as in April - a hot 86.5☏ (30.3☌). The last month of the spring, May, is a tropical month in Williamsburg, Florida, with an average temperature fluctuating between 68.9☏ (20.5☌) and 86.5☏ (30.3☌).
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