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 reveals an average high-temperature of a pleasant 72.3°F (22.4°C), showing minimal difference from the prior month. December's average low-temperature reading settles at an enjoyable 60.8°F (16°C).Humidity
In December, the average relative humidity is 77%.Rainfall
In Port Saint John, Florida, in December, during 12.1 rainfall days, 1.61" (41mm) of precipitation is typically accumulated. In Port Saint John, during the entire year, the rain falls for 202 days and collects up to 40.2" (1021mm) of precipitation.Daylight
With an average of 10h and 24min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 6:58 am and sunset at 5:26 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 5:37 pm EST.
Sunshine
The months with the least sunshine in Port Saint John are January, November and December, with an average of 6.1h of sunshine.UV index
The average daily maximum UV index in December is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index of 5 during December translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are December temperatures in Port Saint John?
What is the average humidity in December?
How many days does it rain in December?
What is the month with the shortest days in Port Saint John?
How many hours of daylight does Port Saint John have in December?
What time are sunrise and sunset in December in Port Saint John?
What is the month with the least sunshine?
How long on average sun shines in December?
What is the UV index reading in December?
Average temperature in December
Port Saint John, FL
- Average high temperature in December: 72.3°F
The warmest month (with the highest average high temperature) is August (88.7°F).
The month with the lowest average high temperature is January (68.4°F).
- Average low temperature in December: 60.8°F
The month with the highest average low temperature is August (77.9°F).
The coldest month (with the lowest average low temperature) is January (56.1°F).
Average pressure in December
Port Saint John, FL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.97"Hg).
Average wind speed in December
Port Saint John, FL
- Average wind speed in December: 8.2mph
The windiest months (with the highest average wind speed) are January and November (8.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in December
Port Saint John, FL
- Average humidity in December: 77%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is March (71%).
Average rainfall in December
Port Saint John, FL
- Average rainfall in December: 1.61"
The wettest month (with the highest rainfall) is August (6.81").
The driest month (with the least rainfall) is March (1.42").
Average rainfall days in December
Port Saint John, FL
- Average rainfall days in December: 12.1 days
The months with the highest number of rainy days are July and August (25.8 days).
The month with the least rainy days is February (10.8 days).
Average daylight in December /
Average sunshine in December
Port Saint John, FL
- Average daylight in December: 10h and 2min
The month with the longest days is June (Average daylight: 13h and 54min).
The month with the shortest days is December (Average daylight: 10h and 24min).
- Average sunshine in December: 6h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The months with the least sunshine are January, November and December (Average sunshine: 6h and 6min).
Average sunshine days in December
Port Saint John, FL
- Average sunshine days in December: 15.2 days
The months with the most sunshine days are January and March (17.2 days).
The month with the least sunshine days is August (2.3 days).
Average UV index in December
Port Saint John, FL
- Average UV index in December: 5
The months with the highest UV index are May, June, July, August and September (UV index 7).
The month with the lowest UV index is January (UV index 4).
Average cloud cover in December
Port Saint John, FL
- Average cloud cover in December: 35
The months with the most cloud cover are January, November and December (Cloud cover 35).
The month with the least cloud cover is May (Cloud cover 26).
Average visibility in December
Port Saint John, FL
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Port Saint John, Florida, USA
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