Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
San Juan notes an average high-temperature of a still moderately hot 27.8°C (82°F) in December, displaying minor variation from November. December nighttime temperatures in San Juan hover close to the daytime peak with an average of 24.1°C (75.4°F).Heat index
The heat index value for December is calculated to be a hot 32°C (89.6°F). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.Note that heat index values are valued for light wind and location in the shade. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', measures the perceived warmth when incorporating the humidity present in the air. This effect tends to be personal, with the weather perception differing among individuals due to variations in body mass, height, and exertion. Keep in mind that direct sunshine exposure can amplify the weather's effects, possibly increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
The average relative humidity in December in San Juan is 82%.Rainfall
In San Juan, in December, it is raining for 18 days, with typically 48mm (1.89") of accumulated precipitation. In San Juan, during the entire year, the rain falls for 196.1 days and collects up to 602mm (23.7") of precipitation.Daylight
December has the shortest days of the year in San Juan, Philippines, with an average of 11h and 18min of daylight.On the first day of the month, sunrise is at 6:05 am and sunset at 5:24 pm. On the last day of December, in San Juan, sunrise is at 6:20 am and sunset at 5:37 pm PST.
Sunshine
In San Juan, the average sunshine in December is 5.4h.UV index
The months with the lowest UV index in San Juan are January and December, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The maximum daily UV index of 6 during December translates into the following directions:
Guard against overexposure. Protection from sun-induced harm is essential. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for San Juan in December?
What is the average humidity in December in San Juan?
How many days does it rain in December in San Juan?
What is the month with the shortest days in San Juan?
How many hours of daylight does San Juan have in December?
When are sunrise and sunset in December in San Juan?
How many hours of sunshine does San Juan have in December?
What are the months with the lowest UV index in San Juan?
What is the UV index reading in December in San Juan?
Average temperature in December
San Juan, Philippines
- Average high temperature in December: 27.8°C
The warmest month (with the highest average high temperature) is May (32°C).
The month with the lowest average high temperature is January (26.6°C).
- Average low temperature in December: 24.1°C
The month with the highest average low temperature is May (25.3°C).
The coldest month (with the lowest average low temperature) is February (22.7°C).
Average pressure in December
San Juan, Philippines
- Average pressure in December: 1011.4mbar
The month with the highest atmospheric pressure is February (1013.4mbar).
The month with the lowest atmospheric pressure is August (1007.6mbar).
Average wind speed in December
San Juan, Philippines
- Average wind speed in December: 13.7km/h
The windiest month (with the highest average wind speed) is January (14.2km/h).
The calmest month (with the lowest average wind speed) is May (7.5km/h).
Average humidity in December
San Juan, Philippines
- Average humidity in December: 82%
The months with the highest relative humidity are July and September (83%).
The month with the lowest relative humidity is April (76%).
Average rainfall in December
San Juan, Philippines
- Average rainfall in December: 48mm
The wettest month (with the highest rainfall) is August (93mm).
The driest month (with the least rainfall) is February (15mm).
Average rainfall days in December
San Juan, Philippines
- Average rainfall days in December: 18 days
The month with the highest number of rainy days is October (18.6 days).
The month with the least rainy days is February (12.5 days).
Average daylight in December /
Average sunshine in December
San Juan, Philippines
- Average daylight in December: 11h and 2min
The month with the longest days is June (Average daylight: 13h and 0min).
The month with the shortest days is December (Average daylight: 11h and 18min).
- Average sunshine in December: 5h and 2min
The month with the most sunshine is April (Average sunshine: 11h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 6min).
Average sunshine days in December
San Juan, Philippines
- Average sunshine days in December: 5.8 days
The month with the most sunshine days is August (14.3 days).
The month with the least sunshine days is January (4.3 days).
Average UV index in December
San Juan, Philippines
- Average UV index in December: 6
The months with the highest UV index are February, March, April, May, June, July, August, September, October and November (UV index 7).
The months with the lowest UV index are January and December (UV index 6).
Average cloud cover in December
San Juan, Philippines
- Average cloud cover in December: 49
The month with the most cloud cover is August (Cloud cover 52).
The month with the least cloud cover is April (Cloud cover 27).
Average visibility in December
San Juan, Philippines
- Average visibility in December: 10km
The months with the highest visibility are February, March, April and December (10km).
The months with the lowest visibility are January, May, June, July, August, September, October and November (9km).
