January weather forecast
Marietta, IL

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Weather in January

January, like December, is another subzero cold winter month in Marietta, Illinois, with temperature in the range of an average high of 31.5°F (-0.3°C) and an average low of 19.4°F (-7°C).

Temperature

January, on average, is the coldest month, registering a high temperature of 31.5°F (-0.3°C) and a low of 19.4°F (-7°C).

Humidity

In January, the average relative humidity is 80%.

Rainfall

In Marietta, in January, it is raining for 4.8 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, in Marietta, there are 131.7 rainfall days, and 22.48" (571mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. The month with the most snowfall in Marietta is January, when snow falls for 9.4 days and typically aggregates up to 3.35" (85mm) of snow.

Daylight

In Marietta, the average length of the day in January is 9h and 40min.
On the first day of the month, sunrise is at 7:24 am and sunset at 4:45 pm. On the last day of January, sunrise is at 7:12 am and sunset at 5:17 pm CST.

Sunshine

January has the least sunshine of the year in Marietta, Illinois, with an average of 4.1h of sunshine.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Marietta. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In January, the maximum UV index of 2 suggests this advice:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
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Frequently asked questions

What is the coldest time of year in Marietta?

January is the coldest month in Marietta, exhibiting average temperatures of 31.5°F (-0.3°C) at the peak and 19.4°F (-7°C) at the base.

How cold is it in Marietta in January?

The high-temperature, in January, in Marietta, is 31.5°F (-0.3°C), while the low-temperature averages to 19.4°F (-7°C).

What is the average humidity in January in Marietta?

The average relative humidity in January in Marietta, Illinois, is 80%.

How much does it rain in Marietta in January?

In January, in Marietta, the rain falls for 4.8 days. Throughout January, 1.02" (26mm) of precipitation is accumulated.

What is the snowiest month in Marietta?

The month with the most snowfall is January, when snow falls for 9.4 days and typically aggregates up to 3.35" (85mm) of snow.

How much does it snow in Marietta in January?

In Marietta, in January, snow falls for 9.4 days, with typically accumulated 3.35" (85mm) of snow.

What is the average length of the day in January in Marietta?

The average day length in January in Marietta, Illinois, is 9h and 40min.

When are sunrise and sunset in January in Marietta?

In January, on the first day of the month, sunrise is at 7:24 am and sunset at 4:45 pm. On the last day of the month, in Marietta, sunrise is at 7:12 am and sunset at 5:17 pm CST.

What is the month with the least sunshine in Marietta?

The month with the least sunshine is January, with an average of 4.1h of sunshine.

How long on average sun shines in January in Marietta?

In Marietta, the average sunshine duration in January is 4.1h.

When is the lowest UV index in Marietta?

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

What is the UV index intensity in January in Marietta?

In Marietta, the average daily maximum UV index in January is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
37°F 2.8°C
31.5°F -0.3°C
36.3°F 2.4°C
Average low temperature
26.4°F -3.1°C
19.4°F -7°C
23°F -5°C
Average pressure
30.11" 765mmHg
30.14" 766mmHg
30.12" 765mmHg
Average wind speed
9.8mph 15.8km/h
10.3mph 16.6km/h
10.3mph 16.6km/h
Average max. wind speed
10.4mph 16.7km/h
11mph 17.7km/h
11mph 17.7km/h
Average wind speed gusts
15.7mph 25.3km/h
16.4mph 26.4km/h
16.2mph 26.1km/h
Average humidity
79%
80%
79%
Average rainfall
0.94" 24mm
1.02" 26mm
1.1" 28mm
Average rainfall days
6.5
4.8
4.7
Average snowfall
1.1" 28mm
3.35" 85mm
2.13" 54mm
Average snowfall days
5
9.4
6.8
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 3min
4h 1min
4h 2min
Average sunshine days
20.4
17.9
17
Average UV index
2
2
2
Average cloud cover
52%
56%
54%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Marietta, IL

Average temperature in January - Marietta, IL
  • Average high temperature in January: 31.5°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (31.5°F).

  • Average low temperature in January: 19.4°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).

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Average pressure in January
Marietta, IL

Average pressure in January - Marietta, IL
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Marietta, IL

Average wind speed in January - Marietta, IL
  • Average wind speed in January: 10.3mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.5mph).

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Average humidity in January
Marietta, IL

Average humidity in January - Marietta, IL
  • Average humidity in January: 80%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

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Average rainfall in January
Marietta, IL

Average rainfall in January - Marietta, IL
  • Average rainfall in January: 1.02"

The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is December (0.94").

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Average rainfall days in January
Marietta, IL

Average rainfall days in January - Marietta, IL
  • Average rainfall days in January: 4.8 days

The month with the highest number of rainy days is May (16.7 days).
The month with the least rainy days is February (4.7 days).

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Average snowfall in January
Marietta, IL

Average snowfall in January - Marietta, IL
  • Average snowfall in January: 3.35"

The month with the highest snowfall is January (3.35").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Marietta, IL

Average snowfall days in January - Marietta, IL
  • Average snowfall days in January: 9.4 days

The month with the highest number of snowfall days is January (9.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Marietta, IL

Average daylight in January / Average sunshine in January - Marietta, IL
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in January: 4h and 1min

The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).

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Average sunshine days in January
Marietta, IL

Average sunshine days in January - Marietta, IL
  • Average sunshine days in January: 17.9 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is June (11.1 days).

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Average UV index in January
Marietta, IL

Average UV index in January - Marietta, IL
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Marietta, IL

Average cloud cover in January - Marietta, IL
  • Average cloud cover in January: 56

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).

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Average visibility in January
Marietta, IL

Average visibility in January - Marietta, IL
  • 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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Marietta, Illinois, USA

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