, the same as December
, in Phnom Penh
, is a hot winter month, with average temperature fluctuating between 21.9°C (71.4°F) and 31.5°C (88.7°F).
In January, the average high-temperature is almost the same as in December - a still hot 31.5°C (88.7°F). In January, the average low-temperature is 21.9°C (71.4°F).
In January, the average heat index is calculated to be a sweltering 40°C (104°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.Note
: The heat index, also known as 'real feel', 'apparent temperature', 'felt air temperature', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. This effect is individual, with diverse people perceiving weather differently for numerous reasons (clothing, metabolic differences, differences in body mass, height, and shape), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
The human body cools itself through perspiration, as excessive warmth is removed from the body through sweat evaporation. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.
The average relative humidity is 73%.
In Phnom Penh, during January, the rain falls for 2.8 days and regularly aggregates up to 25.5mm (1") of precipitation. In Phnom Penh, during the entire year, the rain falls for 153.4 days and collects up to 1635.6mm (64.39") of precipitation.
January and December, with an average of 11.5h of daylight, are months with the shortest days.
In January, the average sunshine in Phnom Penh is 8.4h.
and December, with an average maximum UV index of 10, are months with the lowest UV index in Phnom Penh. A UV Index of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to the Sun's UV rays for the ordinary person.Note
: In January, the average maximum UV index of 10 translate into the following recommendations:
Take extra precautions. Protection against sun damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim.