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
Weather in December
Temperature
The commencement of December introduces an average high-temperature of a still warm 27.6°C (81.7°F), closely mirroring the preceding month. An average low-temperature of 17.7°C (63.9°F) is observed during December nights in San Francisco, Guatemala.Heat index
In December, the heat index is evaluated at a tropical 32°C (89.6°F). Prolonged exposure and physical activity might induce exhaustion, potentially causing heat cramps.Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index could experience an increase of 15 Fahrenheit (8 Celsius) degrees due to direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a measure of how hot it feels when the actual air humidity is factored in. The impression of weather on a person can be swayed by additional aspects, including metabolic variations, pregnancy, and activity levels. 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 particular significance for children. Young ones often ignore the need to take a break and drink fluids. Thirst is a late-stage symptom of dehydration - hence, maintaining hydration, particularly during extended physical activities, is crucial.
Humidity
The months with the highest humidity in San Francisco, Guatemala, are October through December, with an average relative humidity of 85%.Rainfall
In San Francisco, during December, the rain falls for 13.2 days and regularly aggregates up to 30mm (1.18") of precipitation. Throughout the year, in San Francisco, Guatemala, there are 227.8 rainfall days, and 871mm (34.29") of precipitation is accumulated.Daylight
The month with the shortest days in San Francisco is December, with an average of 11h and 6min of daylight.On the first day of December in San Francisco, sunrise is at 06:13 and sunset at 17:24. On the last day of the month, sunrise is at 06:28 and sunset at 17:37 CST.
Sunshine
In San Francisco, Guatemala, the average sunshine in December is 5.2h.UV index
In December, the average daily maximum UV index in San Francisco is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 6 during December translates into the following directions:
Implement preventive steps and embrace sun safety standards. Protection from skin and eye distress is compulsory. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for San Francisco in December?
What is the most humid month in San Francisco?
What is the average humidity in December in San Francisco?
How much does it rain in San Francisco in December?
What is the month with the shortest days in San Francisco?
How many hours of daylight does San Francisco have in December?
What time are sunrise and sunset in December in San Francisco?
How long on average sun shines in December in San Francisco?
How high is the UV index in December in San Francisco?
Average temperature in December
San Francisco, Guatemala
- Average high temperature in December: 27.6°C
The warmest month (with the highest average high temperature) is April (35.5°C).
The month with the lowest average high temperature is January (27.4°C).
- Average low temperature in December: 17.7°C
The month with the highest average low temperature is May (22.5°C).
The coldest month (with the lowest average low temperature) is January (17.1°C).
Average pressure in December
San Francisco, Guatemala
- Average pressure in December: 1016.4mbar
The month with the highest atmospheric pressure is January (1017.5mbar).
The month with the lowest atmospheric pressure is September (1011.8mbar).
Average wind speed in December
San Francisco, Guatemala
- Average wind speed in December: 4.2km/h
The windiest month (with the highest average wind speed) is April (5.7km/h).
The calmest months (with the lowest average wind speed) are October, November and December (4.2km/h).
Average humidity in December
San Francisco, Guatemala
- Average humidity in December: 85%
The months with the highest relative humidity are October, November and December (85%).
The month with the lowest relative humidity is April (67%).
Average rainfall in December
San Francisco, Guatemala
- Average rainfall in December: 30mm
The wettest month (with the highest rainfall) is June (161mm).
The driest month (with the least rainfall) is February (19mm).
Average rainfall days in December
San Francisco, Guatemala
- Average rainfall days in December: 13.2 days
The month with the highest number of rainy days is September (26.8 days).
The month with the least rainy days is February (11.4 days).
Average daylight in December /
Average sunshine in December
San Francisco, Guatemala
- Average daylight in December: 11h and 1min
The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 6min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is April (Average sunshine: 10h and 6min).
The months with the least sunshine are January and November (Average sunshine: 4h and 54min).
Average sunshine days in December
San Francisco, Guatemala
- Average sunshine days in December: 14.8 days
The month with the most sunshine days is March (16.8 days).
The month with the least sunshine days is September (1.7 days).
Average UV index in December
San Francisco, Guatemala
- Average UV index in December: 6
The months with the highest UV index are March, April, May, June and July (UV index 7).
The month with the lowest UV index is January (UV index 5).
Average cloud cover in December
San Francisco, Guatemala
- Average cloud cover in December: 62
The month with the most cloud cover is November (Cloud cover 65).
The month with the least cloud cover is April (Cloud cover 35).
Average visibility in December
San Francisco, Guatemala
- Average visibility in December: 6km
The months with the highest visibility are March, April and May (8km).
The months with the lowest visibility are January, September, October, November and December (6km).
San Francisco, Guatemala
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