January weather forecast
Decatur, AL

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Weather in January

January in Decatur, Alabama, is characterized by relatively low temperatures, with the mercury ranging from 33.3°F (0.7°C) to 47.5°F (8.6°C). It becomes chillier compared to December. The colder days encourage more indoor activities and outdoor winter preparations. The snowfall is relatively light, perspective shared by many neighboring southern states. Clear skies remain a rare spectacle as January greets the new year with more cloud cover.

Temperature

In Decatur, the month of January registers the lowest temperatures, averaging 47.5°F (8.6°C) at the peak and 33.3°F (0.7°C) at the lowest.

Humidity

In Decatur, the average relative humidity in January is 76%.

Rainfall

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

Snowfall

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

Daylight

The average length of the day in January is 10h and 9min.
On the first day of January in Decatur, sunrise is at 6:54 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 5:15 pm CST.

Sunshine

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

UV index

January 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 minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: A maximum high UV index of 2 in January translates into the following recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
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Frequently asked questions

What time of the year is the coldest in Decatur?

Decatur experiences its average lowest temperatures in January, reaching a peak of 47.5°F (8.6°C) and a minimum of 33.3°F (0.7°C).

What is the usual temperature for Decatur in January?

In January, the average high-temperature and low-temperature in Decatur are 47.5°F (8.6°C) and 33.3°F (0.7°C) respectively.

What is the average humidity in January in Decatur?

The average relative humidity in January in Decatur is 76%.

How much does it rain in Decatur in January?

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

When does it snow the most in Decatur?

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

How many days does it snow in January in Decatur?

In Decatur, during January, snow falls for 2 days and regularly aggregates up to 0.55" (14mm) of snow.

How many hours of daylight does Decatur have in January?

In January, the average day length in Decatur, Alabama, is 10h and 9min.

What time are sunrise and sunset in January in Decatur?

On the first day of January in Decatur, sunrise is at 6:54 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 5:15 pm CST.

How long on average sun shines in January in Decatur?

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

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

The months with the lowest UV index in Decatur, Alabama, 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, Alabama, is 2. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
51.6°F 10.9°C
47.5°F 8.6°C
53.1°F 11.7°C
Average low temperature
38.3°F 3.5°C
33.3°F 0.7°C
37.2°F 2.9°C
Average pressure
30.15" 766mmHg
30.17" 766mmHg
30.13" 765mmHg
Average wind speed
8.1mph 13km/h
8.3mph 13.4km/h
8.6mph 13.8km/h
Average max. wind speed
8.6mph 13.8km/h
8.9mph 14.3km/h
9.2mph 14.8km/h
Average wind speed gusts
13.1mph 21.1km/h
13.3mph 21.4km/h
13.6mph 21.9km/h
Average humidity
79%
76%
78%
Average rainfall
4.45" 113mm
3.94" 100mm
4.17" 106mm
Average rainfall days
13.3
12.3
13.3
Average snowfall
0.35" 9mm
0.55" 14mm
0.55" 14mm
Average snowfall days
1.5
2
2.5
Average daylight
9h 5min
10h 1min
11h 0min
Average sunshine
4h 5min
4h 5min
4h 4min
Average sunshine days
15.5
16.1
11.9
Average UV index
2
2
3
Average cloud cover
49%
47%
50%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Decatur, AL

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).

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Average pressure in January
Decatur, AL

Average pressure in January - Decatur, AL
  • Average pressure in January: 30.17"Hg

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

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Average wind speed in January
Decatur, AL

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).

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Average humidity in January
Decatur, AL

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%).

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Average rainfall in January
Decatur, AL

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").

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Average rainfall days in January
Decatur, AL

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).

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Average snowfall in January
Decatur, AL

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

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

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Average snowfall days in January
Decatur, AL

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).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in January /
Average sunshine in January
Decatur, AL

Average daylight in January / Average sunshine in January - Decatur, AL
  • Average daylight in January: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in January: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in January
Decatur, AL

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).

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Average UV index in January
Decatur, AL

Average UV index in January - Decatur, AL
  • Average UV index in January: 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 and December (UV index 2).

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Average cloud cover in January
Decatur, AL

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).

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Average visibility in January
Decatur, AL

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

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Decatur, Alabama, USA

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