December weather forecastSaint Petersburg, FL
December
Weather in December
December in Saint Petersburg, Florida, consummates the year with the coolest conditions. While a steady decline from November's temperatures underlines the chill, daylight duration shrinks further, enhancing the winter experience. Even as sea temperatures plunge significantly, the UV index remains steady at five, ensuring good light during reduced daylight hours. With a minor rise to 1.54in, December’s rainfall surpasses the lows of the preceding months. Emphasizing the winter ambiance, a broadening cloud cover at 30%, the highest all year, makes this month uniquely overcast.Temperature
A minor adjustment in Saint Petersburg's average high-temperature is noted with the start of December, touching an agreeable 71.4°F (21.9°C) from November's 75.6°F (24.2°C). Throughout December, Saint Petersburg records an average temperature of 59.9°F (15.5°C) at night.Humidity
December is the most humid month, with an average relative humidity of 76%.Rainfall
In Saint Petersburg, in December, it is raining for 9.1 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 172.1 rainfall days, and 27.2" (691mm) of precipitation is accumulated.Ocean temperature
In Saint Petersburg, in December, the average water temperature is 68.5°F (20.3°C).Note: For most, swimming in 68.5°F (20.3°C) is not a pleasant activity. Breathing becomes increasingly challenging as water temperature descends from 69.8°F (21°C) to 59°F (15°C).
Daylight
December has the shortest days of the year, with an average of 10h and 24min of daylight.On the first day of December, sunrise is at 7:04 am and sunset at 5:35 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:46 pm EST.
Sunshine
The month with the least sunshine is December, with an average of 6.6h of sunshine.UV index
In December, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 5 in December interprets into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Saint Petersburg, FL
- Average high temperature in December: 71.4°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 (67.6°F).
- Average low temperature in December: 59.9°F
The month with the highest average low temperature is August (79.5°F).
The coldest month (with the lowest average low temperature) is January (55.2°F).
Average pressure in December
Saint Petersburg, FL
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in December
Saint Petersburg, FL
- Average wind speed in December: 8.6mph
The windiest months (with the highest average wind speed) are January, March, October and November (8.9mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).
Average humidity in December
Saint Petersburg, FL
- Average humidity in December: 76%
The month with the highest relative humidity is December (76%).
The month with the lowest relative humidity is May (71%).
Average rainfall in December
Saint Petersburg, FL
- Average rainfall in December: 1.54"
The wettest month (with the highest rainfall) is July (5.24").
The driest months (with the least rainfall) are February and November (0.75").
Average rainfall days in December
Saint Petersburg, FL
- Average rainfall days in December: 9.1 days
The month with the highest number of rainy days is July (26.2 days).
The month with the least rainy days is November (7 days).
Average sea temperature in December
Saint Petersburg, FL
- Average sea temperature in December: 68.6°F
The best month for swimming (with the highest average sea temperature) is August (86.7°F).
The coldest month (with the lowest average sea temperature) is January (64°F).
Average daylight in December /
Average sunshine in December
Saint Petersburg, FL
- Average daylight in December: 10h and 24min
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 36min
The month with the most sunshine is May (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in December
Saint Petersburg, FL
- Average sunshine days in December: 20 days
The month with the most sunshine days is January (22.1 days).
The month with the least sunshine days is July (3.1 days).
Average UV index in December
Saint Petersburg, 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
Saint Petersburg, FL
- Average cloud cover in December: 30
The month with the most cloud cover is December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 21).
Average visibility in December
Saint Petersburg, 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).
