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
December's arrival registers an average high-temperature of a still warm 29.7°C (85.5°F), closely aligning with the temperature of the previous month. Miriyawatta's nights in December experience an average temperature drop to a still moderately hot 24.4°C (75.9°F).Heat index
The heat index in December is appraised at a sweltering 36°C (96.8°F). More preventive actions are needed, risk of heat exhaustion and heat cramps is significant. Prolonged activity may trigger heatstroke.The metrics for the heat index are tailored for both shady environments and light winds. With exposure to direct sunshine, the heat index could climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', joins air temperature with relative humidity to produce a temperature perception for humans. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are primarily vital for children. Children often fail to understand the importance of rest and rehydration. Thirst is a late manifestation of dehydration - hence, it is crucial to stay hydrated, especially during ongoing physical activities.
Perspiring is the body's way of cooling down, particularly by allowing sweat to evaporate and take the heat with it. Greater relative humidity lessens the rate of evaporation, thus decreasing the body's heat dispersal, which gives rise to a sensation of overheating. Increasing body temperatures can be a precursor to dehydration if the body can't shed the extra heat.
Humidity
In December, the average relative humidity is 79%.Rainfall
In Miriyawatta, during December, the rain falls for 16.5 days and regularly aggregates up to 93mm (3.66") of precipitation. In Miriyawatta, during the entire year, the rain falls for 273.8 days and collects up to 2059mm (81.06") of precipitation.Daylight
December has the shortest days of the year in Miriyawatta, Sri Lanka, with an average of 11h and 42min of daylight.On the first day of December, sunrise is at 06:06 and sunset at 17:52. On the last day of the month, sunrise is at 06:21 and sunset at 18:05 +0530.
Sunshine
The average sunshine in December is 7.1h.UV index
The months with the highest UV index are January through April, July, September through December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the average maximum UV index of 7 translates into the following recommendations:
Implement precautions and maintain sun safety methods. Avoidance of sunburn is demanded. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Always opt for UVA and UVB-resistant sunglasses on radiant days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot in Miriyawatta during December?
What is the average humidity in December in Miriyawatta?
How many days does it rain in December in Miriyawatta?
What is the month with the shortest days in Miriyawatta?
How many hours of daylight does Miriyawatta have in December?
When are sunrise and sunset in December in Miriyawatta?
How long on average sun shines in December in Miriyawatta?
What are the months with the highest UV index in Miriyawatta?
What is the UV index intensity in December in Miriyawatta?
Average temperature in December
Miriyawatta, Sri Lanka
- Average high temperature in December: 29.7°C
The warmest months (with the highest average high temperature) are March and April (31.3°C).
The month with the lowest average high temperature is August (28.6°C).
- Average low temperature in December: 24.4°C
The month with the highest average low temperature is May (26.3°C).
The coldest month (with the lowest average low temperature) is January (23.4°C).
Average pressure in December
Miriyawatta, Sri Lanka
- Average pressure in December: 1010.4mbar
The month with the highest atmospheric pressure is January (1011.6mbar).
The month with the lowest atmospheric pressure is May (1008.7mbar).
Average wind speed in December
Miriyawatta, Sri Lanka
- Average wind speed in December: 11.3km/h
The windiest month (with the highest average wind speed) is June (15.9km/h).
The calmest month (with the lowest average wind speed) is March (7.9km/h).
Average humidity in December
Miriyawatta, Sri Lanka
- Average humidity in December: 79%
The months with the highest relative humidity are June, July and August (83%).
The months with the lowest relative humidity are January and February (75%).
Average rainfall in December
Miriyawatta, Sri Lanka
- Average rainfall in December: 93mm
The wettest month (with the highest rainfall) is June (350mm).
The driest month (with the least rainfall) is January (25mm).
Average rainfall days in December
Miriyawatta, Sri Lanka
- Average rainfall days in December: 16.5 days
The months with the highest number of rainy days are July and August (29.5 days).
The month with the least rainy days is January (8.9 days).
Average daylight in December /
Average sunshine in December
Miriyawatta, Sri Lanka
- Average daylight in December: 11h and 4min
The month with the longest days is June (Average daylight: 12h and 30min).
The month with the shortest days is December (Average daylight: 11h and 42min).
- Average sunshine in December: 7h and 1min
The month with the most sunshine is January (Average sunshine: 9h and 12min).
The month with the least sunshine is November (Average sunshine: 6h and 48min).
Average sunshine days in December
Miriyawatta, Sri Lanka
- Average sunshine days in December: 12.5 days
The month with the most sunshine days is January (21 days).
The months with the least sunshine days are June and July (0.3 days).
Average UV index in December
Miriyawatta, Sri Lanka
- Average UV index in December: 7
The months with the highest UV index are January, February, March, April, July, September, October, November and December (UV index 7).
The months with the lowest UV index are May, June and August (UV index 6).
Average cloud cover in December
Miriyawatta, Sri Lanka
- Average cloud cover in December: 37
The month with the most cloud cover is June (Cloud cover 55).
The month with the least cloud cover is January (Cloud cover 24).
Average visibility in December
Miriyawatta, Sri Lanka
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April, November and December (10km).
The months with the lowest visibility are May, June, July, August, September and October (9km).
