December weather forecast and climate
San Bernardino, Paraguay

Weather in December

December, the first month of the summer, in San Bernardino, is still a tropical month, with average temperature varying between 33°C (91.4°F) and 22.3°C (72.1°F).

Temperature

In December, the average high-temperature is relatively the same as in November - a still tropical 33°C (91.4°F). In December, in San Bernardino, the average low-temperature is 22.3°C (72.1°F).

Heat index

In December, the average heat index is evaluated at a scorching 43°C (109.4°F). Beware - heat cramps and heat exhaustion are very likely. Heatstroke is imminent with prolonged activity.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like differences in body mass, height, and shape, clothing, wind, and activity influence one's weather impression. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Perspiration is the human body's physiological response to high temperatures and is an attempt to lower body temperature through evaporation of sweat. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

In December, the average relative humidity is 69%.

Rainfall

In December, in San Bernardino, the rain falls for 15.5 days. Throughout December, 104mm (4.09") of precipitation is accumulated. Throughout the year, there are 153.2 rainfall days, and 865mm (34.06") of precipitation is accumulated.

Daylight

With an average of 13.7h of daylight, December has the longest days of the year in San Bernardino, Paraguay.

Sunshine

The average sunshine in San Bernardino, Paraguay, is 10.4h.

UV index

Months with the highest UV index in San Bernardino are January, February, October and December, with an average maximum UV index of 7. A UV Index of 6 to 7 symbolizes a high threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 7 translate into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in December in San Bernardino?

In December, the average high-temperature is 33°C (91.4°F), and the average low-temperature is 22.3°C (72.1°F). The average heat index (a.k.a. 'apparent temperature', 'real feel'), that factores the actual air temperature with the relative humidity, in December is evaluated at 43°C (109.4°F).

What is the average humidity in December in San Bernardino?

The average relative humidity in December in San Bernardino is 69%.

How many days does it rain in December in San Bernardino?

In December, in San Bernardino, the rain falls for 15.5 days. Throughout December, 104mm (4.09") of precipitation is accumulated.

When are the longest days in San Bernardino?

With an average of 13.7h of daylight, December has the longest days of the year in San Bernardino.

What is the average length of the day in December in San Bernardino?

In San Bernardino, the average length of the day in December is 13.7h.

How long on average sun shines in December in San Bernardino?

In San Bernardino, Paraguay, the average sunshine in December is 10.4h.

When is the highest UV index in San Bernardino?

January, February, October and December, with an average maximum UV index of 7, are months with the highest UV index.

What is the UV index reading in December in San Bernardino?

The average daily maximum UV index in December is 7. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
San Bernardino, Paraguay

Average temperature in December - San Bernardino, Paraguay
  • Average high temperature in December: 33°C

The warmest month (with the highest average high temperature) is January (34°C).
The month with the lowest average high temperature is July (21.2°C).

  • Average low temperature in December: 22.3°C

The month with the highest average low temperature is January (23.3°C).
The coldest month (with the lowest average low temperature) is July (12.5°C).

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Average pressure in December
San Bernardino, Paraguay

Average pressure in December - San Bernardino, Paraguay
  • Average pressure in December: 1007.8mbar

The month with the highest atmospheric pressure is July (1017.3mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).

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Average wind speed in December
San Bernardino, Paraguay

Average wind speed in December - San Bernardino, Paraguay
  • Average wind speed in December: 10.3km/h

The windiest month (with the highest average wind speed) is August (13km/h).
The calmest month (with the lowest average wind speed) is March (9.4km/h).

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Average humidity in December
San Bernardino, Paraguay

Average humidity in December - San Bernardino, Paraguay
  • Average humidity in December: 69%

Months with the highest relative humidity are May and June (84%).
The month with the lowest relative humidity is January (67%).

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Average rainfall in December
San Bernardino, Paraguay

Average rainfall in December - San Bernardino, Paraguay
  • Average rainfall in December: 104mm

The wettest month (with the highest rainfall) is November (109mm).
The driest month (with the least rainfall) is August (18mm).

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Average rainfall days in December
San Bernardino, Paraguay

Average rainfall days in December - San Bernardino, Paraguay
  • Average rainfall days in December: 15.5 days

The month with the highest number of rainy days is January (16.7 days).
The month with the least rainy days is August (5.8 days).

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Average daylight in December /
Average sunshine in December
San Bernardino, Paraguay

Average daylight in December / Average sunshine in December - San Bernardino, Paraguay
  • Average daylight in December: 13.7h

The month with the longest days is December (Average daylight: 13.7h).
The month with the shortest days is June (Average daylight: 10.6h).

  • Average sunshine in December: 10.4h

The month with the most sunshine is November (Average sunshine: 10.5h).
The month with the least sunshine is May (Average sunshine: 7h).

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Average sunshine days in December
San Bernardino, Paraguay

Average sunshine days in December - San Bernardino, Paraguay
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is August (23.8 days).
The month with the least sunshine days is February (10.6 days).

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Average UV index in December
San Bernardino, Paraguay

Average UV index in December - San Bernardino, Paraguay
  • Average UV index in December: 7

Months with the highest UV index are January, February, October and December (UV index 7).
The month with the lowest UV index is May (UV index 4).

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Average cloud cover in December
San Bernardino, Paraguay

Average cloud cover in December - San Bernardino, Paraguay
  • Average cloud cover in December: 29

The month with the most cloud cover is May (Cloud cover 46).
The month with the least cloud cover is November (Cloud cover 26).

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Average visibility in December
San Bernardino, Paraguay

Average visibility in December - San Bernardino, Paraguay
  • Average visibility in December: 9km

Months with the highest visibility are January, February, March, April, July, August, September, October, November and December (9km).
Months with the lowest visibility are May and June (8km).

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