December weather forecast
Petaling Jaya, Malaysia

December gets a head start on lowering temperatures in advance of the approaching new year, reaching a high of 30.9°C (87.6°F) and a low of 23.3°C (73.9°F). Although it marks an increase in rainfall to 153mm (6.02"), pressure averages out at 1009.6mb, suggesting relatively stable weather conditions. Despite frequent showers, the charm of Petaling Jaya is radiant in the satisfactory daylight. As the city moves towards January, temperatures are expected to remain lower while pressure and humidity levels increase slightly, offering a cool start to January.

Temperature

In Petaling Jaya, December records the lowest average temperatures, peaking at 30.9°C (87.6°F) and reaching a low of 23.3°C (73.9°F).

Heat index

The heat index for December is estimated at a blisteringly hot 41°C (105.8°F). Implement enhanced safety actions, heat cramps and heat exhaustion could occur. Sustained activity might result in heatstroke.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'real feel', is achieved by amalgamating air temperature with the relative humidity readings. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Take note that direct exposure to the sun can increase the felt temperature, possibly adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are quite important for babies and toddlers. Kids are usually more vulnerable than adults, given their lesser sweating ability. Along with their larger skin surface relative to their small stature and the excess heat due to their activity, their risk is amplified.
Perspiration and the resultant sweat evaporation are the body's natural thermostat, helping regulate temperature. When the air holds a significant amount of moisture, the efficiency of the evaporation process is decreased, preventing the body from cooling down efficiently, leading to the sensation of overheating. The body is at risk of dehydration and related complications when it fails to shed excessive heat.

Humidity

December is the most humid month, with an average relative humidity of 82%.

Rainfall

In Petaling Jaya, in December, it is raining for 26.8 days, with typically 153mm (6.02") of accumulated precipitation. Throughout the year, in Petaling Jaya, Malaysia, there are 309.8 rainfall days, and 1481mm (58.31") of precipitation is accumulated.

Daylight

With an average of 11h and 54min of daylight, December has the shortest days of the year in Petaling Jaya.
On the first day of December, sunrise is at 7:04 am and sunset at 7:01 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 7:15 pm +08.

Sunshine

The months with the least sunshine are November and December, with an average of 7.4h of sunshine.

UV index

February through October and December, with an average maximum UV index of 7, are months with the highest UV index in Petaling Jaya. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 7 in December translates into these instructions:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight 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.