December weather forecastPortland, TN
December
Weather in December
December, the first month of the winter in Portland, is still a chilly month, with temperature in the range of an average low of 34.7°F (1.5°C) and an average high of 47.3°F (8.5°C).Temperature
The beginning of December brings a minor change in the average high-temperature, shifting from a moderate 56.1°F (13.4°C) in November to a frosty 47.3°F (8.5°C). An average minimum temperature of 34.7°F (1.5°C) is recorded during the month of December.Humidity
March, May and December, with an average relative humidity of 79%, are the most humid months in Portland, Tennessee.Rainfall
In Portland, Tennessee, during December, the rain falls for 13.4 days and regularly aggregates up to 3.39" (86mm) of precipitation. In Portland, Tennessee, during the entire year, the rain falls for 177.4 days and collects up to 44.61" (1133mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In Portland, in December, during 3.6 snowfall days, 1.1" (28mm) of snow is typically accumulated. In Portland, during the entire year, snow falls for 17.7 days and aggregates up to 6.22" (158mm) of snow.Daylight
With an average of 9h and 42min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:40 am and sunset at 4:30 pm. On the last day of December, in Portland, sunrise is at 6:58 am and sunset at 4:40 pm CST.
Sunshine
The average sunshine in December is 4.4h.UV index
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: An average UV index of 2 in December transforms into this advice:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Portland, TN
- Average high temperature in December: 47.3°F
The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (42.8°F).
- Average low temperature in December: 34.7°F
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).
Average pressure in December
Portland, TN
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Portland, TN
- Average wind speed in December: 7.7mph
The windiest month (with the highest average wind speed) is February (8.4mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in December
Portland, TN
- Average humidity in December: 79%
The months with the highest relative humidity are March, May and December (79%).
The months with the lowest relative humidity are October and November (75%).
Average rainfall in December
Portland, TN
- Average rainfall in December: 3.39"
The wettest month (with the highest rainfall) is July (5.39").
The driest month (with the least rainfall) is November (2.56").
Average rainfall days in December
Portland, TN
- Average rainfall days in December: 13.4 days
The month with the highest number of rainy days is July (19.7 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in December
Portland, TN
- Average snowfall in December: 1.1"
The month with the highest snowfall is February (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Portland, TN
- Average snowfall days in December: 3.6 days
The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Portland, TN
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 4h and 24min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).
Average sunshine days in December
Portland, TN
- Average sunshine days in December: 13.9 days
The month with the most sunshine days is November (17.7 days).
The month with the least sunshine days is July (9.7 days).
Average UV index in December
Portland, TN
- Average UV index in December: 2
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in December
Portland, TN
- Average cloud cover in December: 54
The month with the most cloud cover is February (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 32).
Average visibility in December
Portland, TN
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, May and July (5mi).
