December weather forecastKeystone, FL
December
Weather in December
December, the first month of the winter in Keystone, is also an agreeable month, with an average temperature ranging between max 70.2°F (21.2°C) and min 59.4°F (15.2°C).Temperature
The arrival of December marks a slight shift to an average high-temperature of a pleasant 70.2°F (21.2°C) from November's 74.3°F (23.5°C). During the month of December, Keystone anticipates a mean low-temperature of 59.4°F (15.2°C).Humidity
The most humid month in Keystone is December, with an average relative humidity of 77%.Rainfall
In Keystone, in December, during 6.5 rainfall days, 0.94" (24mm) of precipitation is typically accumulated. In Keystone, during the entire year, the rain falls for 120.5 days and collects up to 9.45" (240mm) 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 the month, sunrise is at 7:05 am and sunset at 5:34 pm. On the last day of December, sunrise is at 7:22 am and sunset at 5:45 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 6.5h of sunshine.UV index
In Keystone, the average daily maximum UV index in December is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the UV index of 5 transforms into the following advice:
Be vigilant - Suggestions to stave off sun damage are provided. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. 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
Average temperature in December
Keystone, FL
- Average high temperature in December: 70.2°F
The warmest month (with the highest average high temperature) is August (88.3°F).
The month with the lowest average high temperature is January (66°F).
- Average low temperature in December: 59.4°F
The month with the highest average low temperature is August (80.2°F).
The coldest month (with the lowest average low temperature) is January (54.5°F).
Average pressure in December
Keystone, FL
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is September (29.96"Hg).
Average wind speed in December
Keystone, FL
- Average wind speed in December: 8.5mph
The windiest months (with the highest average wind speed) are January, March and April (8.9mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).
Average humidity in December
Keystone, FL
- Average humidity in December: 77%
The month with the highest relative humidity is December (77%).
The month with the lowest relative humidity is May (72%).
Average rainfall in December
Keystone, FL
- Average rainfall in December: 0.94"
The wettest month (with the highest rainfall) is July (1.77").
The driest month (with the least rainfall) is March (0.2").
Average rainfall days in December
Keystone, FL
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is August (17.9 days).
The month with the least rainy days is November (5.5 days).
Average daylight in December /
Average sunshine in December
Keystone, 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 30min
The month with the most sunshine is May (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in December
Keystone, FL
- Average sunshine days in December: 23.3 days
The month with the most sunshine days is January (23.4 days).
The month with the least sunshine days is July (6.7 days).
Average UV index in December
Keystone, 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
Keystone, FL
- Average cloud cover in December: 30
The months with the most cloud cover are January and December (Cloud cover 30).
The month with the least cloud cover is May (Cloud cover 20).
Average visibility in December
Keystone, 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).
