January weather forecast and climate
Decatur, AL

January, the same as December, in Decatur, Alabama, is another chilly winter month, with average temperature varying between 33.3°F (0.7°C) and 47.5°F (8.6°C).

Temperature

January is the coldest month, with an average high-temperature of 47.5°F (8.6°C) and an average low-temperature of 33.3°F (0.7°C).

Humidity

The average relative humidity in January is 76%.

Rainfall

In Decatur, it is raining for 12.3 days, with typically 3.94" (100mm) of accumulated precipitation. Throughout the year, in Decatur, there are 177.6 rainfall days, and 43.11" (1095mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. Months with the most snowfall in Decatur are January and February, with an average 0.55" (14mm) of accumulated snow.

Daylight

In January, the average length of the day in Decatur is 10.2h.

Sunshine

In January, the average sunshine in Decatur is 4.9h.

UV index

Months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the coldest month in Decatur?

The coldest month is January, with an average high-temperature of 47.5°F (8.6°C) and an average low-temperature of 33.3°F (0.7°C).

What is the temperature in January in Decatur?

The average high-temperature, in January, in Decatur, is 47.5°F (8.6°C), while the average low-temperature is 33.3°F (0.7°C).

What is the average humidity in January in Decatur?

In January, the average relative humidity is 76%.

How much does it rain in Decatur in January?

In Decatur, Alabama, in January, during 12.3 rainfall days, 3.94" (100mm) of precipitation is typically accumulated.

How many days does it snow in January in Decatur?

In Decatur, in January, during 2 snowfall days, 0.55" (14mm) of snow is typically accumulated.

What is the snowiest month in Decatur?

Months with the most snowfall in Decatur, Alabama, are January and February, with an average 0.55" (14mm) of accumulated snow.

How many hours of daylight does Decatur have in January?

The average length of the day in January in Decatur is 10.2h.

How long on average sun shines in January in Decatur?

The average sunshine in January is 4.9h.

When is the lowest UV index in Decatur?

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

What is the UV index intensity in January in Decatur?

The average daily maximum UV index in January in Decatur is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in January - Decatur, AL
  • Average high temperature in January: 47.5°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 January: 33.3°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 January - Decatur, AL
  • Average pressure in January: 30.17"

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 January - Decatur, AL
  • Average wind speed in January: 8.3mph

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 January - Decatur, AL
  • Average humidity in January: 76%

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

Average rainfall in January - Decatur, AL
  • Average rainfall in January: 3.94"

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 January - Decatur, AL
  • Average rainfall days in January: 12.3 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 January - Decatur, AL
  • Average snowfall in January: 0.55"

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 January - Decatur, AL
  • Average snowfall days in January: 2 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 January / Average sunshine in January - Decatur, AL
  • Average daylight in January: 10.2h

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 January: 4.9h

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 January - Decatur, AL
  • Average sunshine days in January: 16.1 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 January - Decatur, AL
  • Average UV index in January: 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 January - Decatur, AL
  • Average cloud cover in January: 47

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 January - Decatur, AL
  • Average visibility in January: 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).