January weather forecast
Lanark, IL

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Weather in January

Transitioning from the ending month, December, to January, there is a noticeable dip in the temperature, that marks the winter season in Lanark, Illinois, USA. The mercury usually silhouettes around 13.5°F (-10.3°C) to 25.9°F (-3.4°C), appending this period a rather icy exterior. Humidity takes a crest, touching 87%, an attribute often linked with winter months. The city enters its peak snowfall period, with snow-covered lanes and roofs becoming a common sight. Irrespective of the colder season, days are still decently bright with around 9.5hours of daylight.

Temperature

January, with its average high-temperature of 25.9°F (-3.4°C) and an average low-temperature of 13.5°F (-10.3°C), holds the record as the coldest month in Lanark.

Humidity

The most humid month in Lanark is January, with an average relative humidity of 87%.

Rainfall

January and February are months with the least rain in Lanark when the rain falls for 4.8 days and typically aggregates up to 0.71" (18mm) of rain.

Snowfall

January through April, October through December are months with snowfall. The month with the most snowfall is January, when snow falls for 11.2 days and typically aggregates up to 2.64" (67mm) of snow.

Daylight

The average length of the day in January is 9h and 32min.
On the first day of the month, sunrise is at 7:27 am and sunset at 4:37 pm. On the last day of January, sunrise is at 7:13 am and sunset at 5:12 pm CST.

Sunshine

The month with the least sunshine is January, with an average of 3.7h of sunshine.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Lanark. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: In January, the maximum UV index of 1 suggests these recommendations:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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Frequently asked questions

What is the coldest month in Lanark?

Lanark's coldest month, January, registers temperatures that range from a high of 25.9°F (-3.4°C) to a low of 13.5°F (-10.3°C).

How cold is January in Lanark?

In January, the average high-temperature and low-temperature in Lanark are 25.9°F (-3.4°C) and 13.5°F (-10.3°C) respectively.

What is the most humid month in Lanark?

January is the most humid month, with an average relative humidity of 87%.

What is the average humidity in January in Lanark?

The average relative humidity in January in Lanark is 87%.

What is the driest month in Lanark?

January and February are months with the least rain in Lanark, Illinois, when the rain falls for 4.8 days and typically aggregates up to 0.71" (18mm) of rain.

How much does it rain in Lanark in January?

In Lanark, Illinois, in January, it is raining for 4.8 days, with typically 0.71" (18mm) of accumulated precipitation.

When does it snow the most in Lanark?

January is the month with the most snowfall in Lanark, Illinois. Snow falls for 11.2 days and accumulates 2.64" (67mm) of snow.

How much does it snow in Lanark in January?

In Lanark, Illinois, in January, snow falls for 11.2 days, with typically accumulated 2.64" (67mm) of snow.

How many hours of daylight does Lanark have in January?

In Lanark, Illinois, the average day length in January is 9h and 32min.

When is the sunrise / sunset in January in Lanark?

On the first day of January, sunrise is at 7:27 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:13 am and sunset at 5:12 pm CST.

What is the month with the least sunshine in Lanark?

The month with the least sunshine is January, with an average of 3.7h of sunshine.

How many hours of sunshine does Lanark have in January?

The average sunshine duration in January in Lanark is 3.7h.

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

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Lanark.

How high is the UV index in January in Lanark?

In January, the average daily maximum UV index in Lanark, Illinois, is 1. A UV Index estimate of 2, and below, represents a low health threat from exposure to the Sun's UV radiation.
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
Lanark, IL

Average temperature in January - Lanark, IL
  • Average high temperature in January: 25.9°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (25.9°F).

  • Average low temperature in January: 13.5°F

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).

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Average pressure in January
Lanark, IL

Average pressure in January - Lanark, IL
  • Average pressure in January: 30.12"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Lanark, IL

Average wind speed in January - Lanark, IL
  • Average wind speed in January: 9.8mph

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

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Average humidity in January
Lanark, IL

Average humidity in January - Lanark, IL
  • Average humidity in January: 87%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in January
Lanark, IL

Average rainfall in January - Lanark, IL
  • Average rainfall in January: 0.71"

The wettest month (with the highest rainfall) is May (2.76").
The driest months (with the least rainfall) are January and February (0.71").

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Average rainfall days in January
Lanark, IL

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

The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is February (4.4 days).

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Average snowfall in January
Lanark, IL

Average snowfall in January - Lanark, IL
  • Average snowfall in January: 2.64"

The month with the highest snowfall is January (2.64").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in January
Lanark, IL

Average snowfall days in January - Lanark, IL
  • Average snowfall days in January: 11.2 days

The month with the highest number of snowfall days is January (11.2 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
Lanark, IL

Average daylight in January / Average sunshine in January - Lanark, IL
  • Average daylight in January: 9h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in January: 3h and 4min

The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days in January
Lanark, IL

Average sunshine days in January - Lanark, IL
  • Average sunshine days in January: 17.3 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is June (10 days).

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Average UV index in January
Lanark, IL

Average UV index in January - Lanark, IL
  • Average UV index in January: 1

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in January
Lanark, IL

Average cloud cover in January - Lanark, IL
  • Average cloud cover in January: 61

The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is September (Cloud cover 32).

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Average visibility in January
Lanark, IL

Average visibility in January - Lanark, IL
  • Average visibility in January: 5mi

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

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Lanark, Illinois, USA

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