December weather forecastPematangsiantar, Indonesia
December
Weather in December
The first month of the winter, December, is also a moderately hot month in Pematangsiantar, Indonesia, with temperature in the range of an average high of 27.7°C (81.9°F) and an average low of 20.7°C (69.3°F).Temperature
December, on average, is the coldest month, registering a high temperature of 27.7°C (81.9°F) and a low of 20.7°C (69.3°F).Heat index
In December, the heat index is evaluated at a hot 32°C (89.6°F). With ongoing exposure and activity, one might experience weariness, and heat cramps could ensue.Be aware that heat index ratings are designed for shaded locations and minor breezes. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'apparent temperature' or 'felt air temperature', takes into account both air temperature and humidity to illustrate what people actually feel. This effect is personal, shaped by the individual's physical activity and heat sensitivity, influenced by factors including wind, clothing, and metabolic variances. Direct exposure to the sun's rays can enhance the felt temperature, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are essentially critical for children. Youths are typically more endangered than adults since they usually sweat less. Their larger skin surface concerning their smaller bodies and higher heat production due to activity further adds to their vulnerability.
Humidity
The months with the highest humidity are January, November and December, with an average relative humidity of 87%.Rainfall
In Pematangsiantar, in December, during 29.3 rainfall days, 234mm (9.21") of precipitation is typically accumulated. In Pematangsiantar, Indonesia, during the entire year, the rain falls for 317.9 days and collects up to 2279mm (89.72") of precipitation.Daylight
The month with the shortest days is December, with an average of 12h and 0min of daylight.On the first day of the month, sunrise is at 06:13 and sunset at 18:11. On the last day of December, in Pematangsiantar, Indonesia, sunrise is at 06:28 and sunset at 18:25 WIB.
Sunshine
January and December, with an average of 7.2h of sunshine, are months with the least sunshine.UV index
The months with the highest UV index in Pematangsiantar are January through December, with an average maximum UV index of 6. The months with the lowest UV index in Pematangsiantar are January through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 6 translates into these guidelines:
Deter overexposure. Protecting against the sun's effects is essential. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete 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.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Pematangsiantar, Indonesia
- Average high temperature in December: 27.7°C
The warmest month (with the highest average high temperature) is June (30.1°C).
The month with the lowest average high temperature is December (27.7°C).
- Average low temperature in December: 20.7°C
The month with the highest average low temperature is May (21.3°C).
The coldest month (with the lowest average low temperature) is January (20°C).
Average pressure in December
Pematangsiantar, Indonesia
- Average pressure in December: 1010.1mbar
The month with the highest atmospheric pressure is January (1010.8mbar).
The month with the lowest atmospheric pressure is May (1009.6mbar).
Average wind speed in December
Pematangsiantar, Indonesia
- Average wind speed in December: 4.3km/h
The windiest month (with the highest average wind speed) is February (4.8km/h).
The calmest month (with the lowest average wind speed) is November (4km/h).
Average humidity in December
Pematangsiantar, Indonesia
- Average humidity in December: 87%
The months with the highest relative humidity are January, November and December (87%).
The months with the lowest relative humidity are June, July and August (82%).
Average rainfall in December
Pematangsiantar, Indonesia
- Average rainfall in December: 234mm
The wettest month (with the highest rainfall) is April (237mm).
The driest month (with the least rainfall) is February (127mm).
Average rainfall days in December
Pematangsiantar, Indonesia
- Average rainfall days in December: 29.3 days
The month with the highest number of rainy days is December (29.3 days).
The month with the least rainy days is June (22.6 days).
Average daylight in December /
Average sunshine in December
Pematangsiantar, Indonesia
- Average daylight in December: 12h and 0min
The month with the longest days is June (Average daylight: 12h and 18min).
The month with the shortest days is December (Average daylight: 12h and 0min).
- Average sunshine in December: 7h and 12min
The months with the most sunshine are March and August (Average sunshine: 8h and 18min).
The months with the least sunshine are January and December (Average sunshine: 7h and 12min).
Average sunshine days in December
Pematangsiantar, Indonesia
- Average sunshine days in December: 0.8 days
The month with the most sunshine days is June (6.1 days).
The month with the least sunshine days is December (0.8 days).
Average UV index in December
Pematangsiantar, Indonesia
- Average UV index in December: 6
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 6).
Average cloud cover in December
Pematangsiantar, Indonesia
- Average cloud cover in December: 52
The month with the most cloud cover is December (Cloud cover 52).
The months with the least cloud cover are June, July and August (Cloud cover 39).
Average visibility in December
Pematangsiantar, Indonesia
- Average visibility in December: 7km
The months with the highest visibility are March, June, July, August, September, October and November (8km).
The months with the lowest visibility are January, February, April, May and December (7km).
