January weather forecast
Macomb, IL

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Weather in January

January, like December, is another subzero cold winter month in Macomb, Illinois, with an average temperature varying between 19°F (-7.2°C) and 30.9°F (-0.6°C).

Temperature

Macomb records the coldest temperatures in January, averaging a high of 30.9°F (-0.6°C) and a low of 19°F (-7.2°C).

Humidity

The average relative humidity in January is 81%.

Rainfall

The month with the least rainfall is January, when the rain falls for 4.2 days and typically collects 0.67" (17mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. January is the month with the most snowfall in Macomb. Snow falls for 7.6 days and accumulates 1.89" (48mm) of snow.

Daylight

In January, the average length of the day is 9h and 41min.
On the first day of the month, sunrise is at 7:25 am and sunset at 4:46 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:19 pm CST.

Sunshine

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

UV index

The months with the lowest UV index in Macomb are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 2 during January leads to these instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What is the coldest month in Macomb?

Macomb experiences its average lowest temperatures in January, reaching a peak of 30.9°F (-0.6°C) and a minimum of 19°F (-7.2°C).

How cold is January in Macomb?

In January, the average high-temperature and low-temperature in Macomb are 30.9°F (-0.6°C) and 19°F (-7.2°C) respectively.

What is the average humidity in January in Macomb?

In January, the average relative humidity is 81%.

What is the driest month in Macomb?

January is the month with the least rainfall. Rain falls for 4.2 days and accumulates 0.67" (17mm) of precipitation.

How many days does it rain in January in Macomb?

In Macomb, Illinois, in January, it is raining for 4.2 days, with typically 0.67" (17mm) of accumulated precipitation.

When does it snow the most in Macomb?

The month with the most snowfall in Macomb, Illinois, is January, when snow falls for 7.6 days and typically aggregates up to 1.89" (48mm) of snow.

How many days does it snow in January in Macomb?

In January, in Macomb, it is snowing for 7.6 days. Throughout January, 1.89" (48mm) of snow is accumulated.

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

The average day length in January in Macomb, Illinois, is 9h and 41min.

When is the sunrise / sunset in January in Macomb?

On the first day of January in Macomb, sunrise is at 7:25 am and sunset at 4:46 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:19 pm CST.

What is the month with the least sunshine in Macomb?

With an average of 4.1h of sunshine, January has the least sunshine of the year in Macomb.

How many hours of sunshine does Macomb have in January?

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

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

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

How high is the UV index in January in Macomb?

In Macomb, Illinois, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in January
Macomb, IL

Average temperature in January - Macomb, IL
  • Average high temperature in January: 30.9°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (30.9°F).

  • Average low temperature in January: 19°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°F).

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Average pressure in January
Macomb, IL

Average pressure in January - Macomb, 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
Macomb, IL

Average wind speed in January - Macomb, IL
  • Average wind speed in January: 10.6mph

The windiest month (with the highest average wind speed) is January (10.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in January
Macomb, IL

Average humidity in January - Macomb, IL
  • Average humidity in January: 81%

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
Macomb, IL

Average rainfall in January - Macomb, IL
  • Average rainfall in January: 0.67"

The wettest month (with the highest rainfall) is May (2.56").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in January
Macomb, IL

Average rainfall days in January - Macomb, IL
  • Average rainfall days in January: 4.2 days

The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is January (4.2 days).

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Average snowfall in January
Macomb, IL

Average snowfall in January - Macomb, IL
  • Average snowfall in January: 1.89"

The month with the highest snowfall is January (1.89").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Macomb, IL

Average snowfall days in January - Macomb, IL
  • Average snowfall days in January: 7.6 days

The month with the highest number of snowfall days is January (7.6 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
Macomb, IL

Average daylight in January / Average sunshine in January - Macomb, 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 month with the most sunshine is 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
Macomb, IL

Average sunshine days in January - Macomb, IL
  • Average sunshine days in January: 19.8 days

The month with the most sunshine days is December (20.6 days).
The month with the least sunshine days is June (12.2 days).

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Average UV index in January
Macomb, IL

Average UV index in January - Macomb, 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
Macomb, IL

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

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 30).

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Average visibility in January
Macomb, IL

Average visibility in January - Macomb, IL
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).

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Macomb, Illinois, USA

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