December weather forecastO'Brien, FL

December

Weather in December

The first month of the winter, December, is also an enjoyable month in O'Brien, Florida, with temperature in the range of an average high of 66°F (18.9°C) and an average low of 49.1°F (9.5°C).

Temperature

Transitioning into December, O'Brien records an average high-temperature of a refreshing 66°F (18.9°C), almost identical to November's 71.2°F (21.8°C). Nighttime temperatures hover around an average low of 49.1°F (9.5°C) in December.

Humidity

In O'Brien, the average relative humidity in December is 76%.

Rainfall

In O'Brien, in December, it is raining for 9.5 days, with typically 1.5" (38mm) of accumulated precipitation. Throughout the year, there are 173.7 rainfall days, and 30.83" (783mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall.

Daylight

With an average of 10h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:10 am and sunset at 5:31 pm. On the last day of December, in O'Brien, sunrise is at 7:27 am and sunset at 5:42 pm EST.

Sunshine

December has the least sunshine of the year, with an average of 5.9h of sunshine.

UV index

In O'Brien, the average daily maximum UV index in December is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: An average maximum UV index of 4 in December leads to these recommendations:
Guard yourself - Avoiding sunburn is suggested. To guard against the harmful effects of the Sun, minimize exposure during midday. Opt for tightly woven and loose clothing to enhance protection from the Sun.

Updated: Jul 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

In O'Brien, 66°F (18.9°C) is the average high-temperature and 49.1°F (9.5°C) is the average low-temperature during December. In October, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is estimated at 86°F (30°C).

The average relative humidity in December is 76%.

In December, the rain falls for 9.5 days. Throughout December, 1.5" (38mm) of precipitation is accumulated.

January, March through December are months without snowfall in O'Brien.

December has the shortest days of the year, with an average of 10h and 18min of daylight.

The average day length in December is 10h and 15min.

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 5:31 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:42 pm EST.

The month with the least sunshine is December, with an average of 5.9h of sunshine.

The average sunshine duration in December is 5.9h.

The average daily maximum UV index in December in O'Brien, Florida, is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to the Sun's UV radiation.

Today

Tomorrow

Long-term

Year J F M A M J J A S O N December

Nov

December

Jan

Average high temperature

71.2°F

66°F

62.2°F

Average low temperature

Average pressure

Average wind speed

Average max. wind speed

6.3mph

6.6mph

6.5mph

Average wind speed gusts

Average humidity

Average rainfall

Average rainfall days

7.1

9.5

8.8

Average snowfall days

Average daylight

Average sunshine

Average sunshine days

21.5

20.3

Average UV index

Average cloud cover

Average visibility

Average temperature in December
O'Brien, FL

Average high temperature in December: 66°F

The warmest months (with the highest average high temperature) are July and August (91.2°F).
The month with the lowest average high temperature is January (62.2°F).

Average low temperature in December: 49.1°F

The month with the highest average low temperature is August (74.8°F).
The coldest month (with the lowest average low temperature) is January (44.2°F).

Average pressure in December
O'Brien, FL

Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).

Average wind speed in December
O'Brien, FL

Average wind speed in December: 6.2mph

The windiest month (with the highest average wind speed) is April (6.5mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).

Average humidity in December
O'Brien, FL

Average humidity in December: 76%

The months with the highest relative humidity are August and September (77%).
The month with the lowest relative humidity is May (70%).

Average rainfall in December
O'Brien, FL

Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is August (4.53").
The driest month (with the least rainfall) is November (0.98").

Average rainfall days in December
O'Brien, FL

Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is August (25.4 days).
The month with the least rainy days is November (7.1 days).

Average snowfall days in December
O'Brien, FL

Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in December /
Average sunshine in December
O'Brien, FL

Average daylight in December: 10h and 18min

The month with the longest days is June (Average daylight: 14h and 0min).
The month with the shortest days is December (Average daylight: 10h and 18min).

Average sunshine in December: 5h and 54min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).

Average sunshine days in December
O'Brien, FL

Average sunshine days in December: 20.3 days

The month with the most sunshine days is November (21.5 days).
The month with the least sunshine days is August (4.2 days).

Average UV index in December
O'Brien, FL

Average UV index in December: 4

The months with the highest UV index are May, June, July and August (UV index 7).
The month with the lowest UV index is January (UV index 3).

Average cloud cover in December
O'Brien, FL

Average cloud cover in December: 40

The month with the most cloud cover is December (Cloud cover 40).
The months with the least cloud cover are May and October (Cloud cover 30).

Average visibility in December
O'Brien, FL

Average visibility in December: 5mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is December (5mi).