The last month of the spring, May
, is another tropical month in Phnom Penh
, with an average temperature fluctuating between 34.3°C (93.7°F) and 25.3°C (77.5°F).
In Phnom Penh, Cambodia, the average high-temperature in May is almost the same as in April
- a still hot 34.3°C (93.7°F). The average low-temperature, in Phnom Penh, is 25.3°C (77.5°F).
The average heat index in May is estimated at a life-threatening hot 51.7°C (125.1°F). Beware
: Heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged 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 'feels like', 'felt air temperature', 'apparent temperature', or 'real feel', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, differences in body mass, height, and shape, clothing, and metabolic differences affect individual temperature impact. 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 particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. When heat gain exceeds the level the body can remove, body temperature begins to rise, and heat-related illnesses and disorders may develop.
The average relative humidity in May is 77%.
In Phnom Penh, during 16.4 rainfall days, 111.6mm (4.39") of precipitation is typically accumulated. Throughout the year, there are 153.4 rainfall days, and 1635.6mm (64.39") of precipitation is accumulated.
In May, the average length of the day is 12h and 40min.
On the first day of the month, sunrise is at 05:41 and sunset at 18:13. On the last day of May, sunrise is at 05:35 and sunset at 18:20 +07.
In Phnom Penh, the average sunshine in May is 6.5h.
, with an average maximum UV index of 12, are months with the highest UV index in Phnom Penh. A UV Index estimate of 11, and higher, represents an extreme threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note
: The average daily UV index of 12 in May transform into the following instructions:
Take all required precautions, as unprotected skin and eyes can burn in minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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.