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 advent of December presents an average high-temperature of a still warm 29.5°C (85.1°F), maintaining a close correlation with the preceding month. December sees the temperature falling to a mean low of 17.6°C (63.7°F).Heat index
In December, the average heat index is evaluated at a hot 32°C (89.6°F). Long-lasting exposure and activity potentially induce a sense of weariness, with the risk of heat cramps.Be advised, the heat index considers values for conditions in shade and with a light breeze. 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 'real feel' or 'apparent temperature', gives an indication of how one might feel in terms of heat after considering humidity. Additional elements encompassing metabolic differences, the degree of physical activity, and attire can impact the individual's perception of temperature. It is essential to realize that direct sunlight can escalate the perceived temperature, increasing the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.
Humidity
In San Bernardino, the average relative humidity in December is 63%.Rainfall
In December, the rain falls for 7.6 days. Throughout December, 17mm (0.67") of precipitation is accumulated. In San Bernardino, during the entire year, the rain falls for 222.8 days and collects up to 1491mm (58.7") of precipitation.Daylight
December has the shortest days of the year in San Bernardino, Guatemala, with an average of 11h and 18min of daylight.On the first day of December, sunrise is at 06:15 and sunset at 17:34. On the last day of the month, sunrise is at 06:30 and sunset at 17:47 CST.
Sunshine
The average sunshine in December is 7.5h.UV index
The months with the highest UV index in San Bernardino are January through December, with an average maximum UV index of 6. The months with the lowest UV index in San Bernardino are January through December, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the average person.Note: The UV index of 6 during December leads to these advisories:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
How hot does it get in San Bernardino in December?
What is the average humidity in December in San Bernardino?
How many days does it rain in December in San Bernardino?
What is the month with the shortest days in San Bernardino?
How many hours of daylight does San Bernardino have in December?
When are sunrise and sunset in December in San Bernardino?
How many hours of sunshine does San Bernardino have in December?
What is the month with the highest UV index in San Bernardino?
When is the lowest UV index in San Bernardino?
How high is the UV index in December in San Bernardino?
Average temperature in December
San Bernardino, Guatemala
- Average high temperature in December: 29.5°C
The warmest month (with the highest average high temperature) is March (31.5°C).
The month with the lowest average high temperature is September (28.5°C).
- Average low temperature in December: 17.6°C
The month with the highest average low temperature is May (20.5°C).
The coldest month (with the lowest average low temperature) is December (17.6°C).
Average pressure in December
San Bernardino, Guatemala
- Average pressure in December: 1013.9mbar
The month with the highest atmospheric pressure is January (1014.5mbar).
The month with the lowest atmospheric pressure is October (1012.2mbar).
Average wind speed in December
San Bernardino, Guatemala
- Average wind speed in December: 6.4km/h
The windiest month (with the highest average wind speed) is March (6.6km/h).
The calmest month (with the lowest average wind speed) is May (5.1km/h).
Average humidity in December
San Bernardino, Guatemala
- Average humidity in December: 63%
The months with the highest relative humidity are September and October (79%).
The months with the lowest relative humidity are January, February and March (59%).
Average rainfall in December
San Bernardino, Guatemala
- Average rainfall in December: 17mm
The wettest month (with the highest rainfall) is May (274mm).
The driest months (with the least rainfall) are January and February (7mm).
Average rainfall days in December
San Bernardino, Guatemala
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is September (27.5 days).
The month with the least rainy days is January (4.8 days).
Average daylight in December /
Average sunshine in December
San Bernardino, Guatemala
- 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: 7h and 3min
The months with the most sunshine are April and July (Average sunshine: 11h and 12min).
The month with the least sunshine is November (Average sunshine: 7h and 24min).
Average sunshine days in December
San Bernardino, Guatemala
- Average sunshine days in December: 21.5 days
The month with the most sunshine days is January (24.4 days).
The month with the least sunshine days is September (1.5 days).
Average UV index in December
San Bernardino, Guatemala
- 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
San Bernardino, Guatemala
- Average cloud cover in December: 13
The month with the most cloud cover is June (Cloud cover 38).
The month with the least cloud cover is January (Cloud cover 12).
Average visibility in December
San Bernardino, Guatemala
- Average visibility in December: 10km
The months with the highest visibility are January, February, March, April and December (10km).
The months with the lowest visibility are May, June, July, August, September, October and November (9km).
San Bernardino, Guatemala
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