December weather forecast and climate
Decatur, AL

December, the first month of the winter, in Decatur, is still a cool month, with temperature in the range of an average high of 51.6°F (10.9°C) and an average low of 38.3°F (3.5°C).

Temperature

In December, the average high-temperature slightly decreases, from a mild 59.5°F (15.3°C) in November, to a fresh 51.6°F (10.9°C). In December, the average low-temperature is 38.3°F (3.5°C).

Humidity

With an average relative humidity of 79%, December is the most humid month.

Rainfall

The month with the most rainfall in Decatur is December when the rain falls for 13.3 days and typically aggregates up to 4.45" (113mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Decatur, snow falls for 1.5 days, with typically accumulated 0.35" (9mm) of snow. In Decatur, during the entire year, snow falls for 7.4 days, and aggregates up to 1.77" (45mm) of snow.

Daylight

With an average of 9.9h of daylight, December has the shortest days of the year in Decatur.

Sunshine

In December, the average sunshine is 4.8h.

UV index

Months with the lowest UV index in Decatur are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to the UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the temperature in December in Decatur?

In December, the average high-temperature is 51.6°F (10.9°C), and the average low-temperature is 38.3°F (3.5°C).

What is the most humid month in Decatur?

With an average relative humidity of 79%, December is the most humid month.

What is the average humidity in December in Decatur?

In Decatur, the average relative humidity in December is 79%.

How much does it rain in Decatur in December?

In Decatur, Alabama, in December, during 13.3 rainfall days, 4.45" (113mm) of precipitation is typically accumulated.

What is the wettest month in Decatur?

The month with the most rainfall is December when the rain falls for 13.3 days and typically aggregates up to 4.45" (113mm) of precipitation.

How many days does it snow in December in Decatur?

In Decatur, Alabama, in December, snow falls for 1.5 days, with typically accumulated 0.35" (9mm) of snow.

What is the month with the shortest days in Decatur?

With an average of 9.9h of daylight, December has the shortest days of the year in Decatur.

How many hours of daylight does Decatur have in December?

In Decatur, the average length of the day in December is 9.9h.

How long on average sun shines in December in Decatur?

In December, the average sunshine in Decatur, Alabama, is 4.8h.

What are the months with the lowest UV index in Decatur?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

What is the UV index reading in December in Decatur?

In Decatur, Alabama, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk from the exposure to the Sun's UV rays.
Average temperature in December - Decatur, AL
  • Average high temperature in December: 51.6°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is January (47.5°F).

  • Average low temperature in December: 38.3°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (33.3°F).

Average pressure in December - Decatur, AL
  • Average pressure in December: 30.15"

The month with the highest atmospheric pressure is January (30.17").
The month with the lowest atmospheric pressure is June (29.98").

Average wind speed in December - Decatur, AL
  • Average wind speed in December: 8.1mph

The windiest month (with the highest average wind speed) is February (8.6mph).
The calmest month (with the lowest average wind speed) is July (4.8mph).

Average humidity in December - Decatur, AL
  • Average humidity in December: 79%

The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December - Decatur, AL
  • Average rainfall in December: 4.45"

The wettest month (with the highest rainfall) is December (4.45").
The driest months (with the least rainfall) are September and November (2.48").

Average rainfall days in December - Decatur, AL
  • Average rainfall days in December: 13.3 days

The month with the highest number of rainy days is July (20 days).
The month with the least rainy days is November (10.4 days).

Average snowfall in December - Decatur, AL
  • Average snowfall in December: 0.35"

Months with the highest snowfall are January and February (0.55").
Months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December - Decatur, AL
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (2.5 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average daylight in December / Average sunshine in December - Decatur, AL
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 4.8h

The month with the most sunshine is June (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

Average sunshine days in December - Decatur, AL
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (8.8 days).

Average UV index in December - Decatur, AL
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January and December (UV index 2).

Average cloud cover in December - Decatur, AL
  • Average cloud cover in December: 49

The month with the most cloud cover is February (Cloud cover 50).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in December - Decatur, AL
  • Average visibility in December: 6mi

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