January weather forecast
Clayton, MO

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Weather in January

January, like December, in Clayton, Missouri, is an icy winter month, with an average temperature varying between 37.8°F (3.2°C) and 24.3°F (-4.3°C).

Temperature

January brings the lowest temperatures, with an average high of 37.8°F (3.2°C) and an average low of 24.3°F (-4.3°C).

Humidity

In January, the average relative humidity is 75%.

Rainfall

In January, in Clayton, the rain falls for 6.5 days. Throughout January, 1.73" (44mm) of precipitation is accumulated. Throughout the year, in Clayton, there are 144.8 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In Clayton, during January, snow falls for 4.7 days and regularly aggregates up to 2.24" (57mm) of snow. Throughout the year, in Clayton, there are 16.2 snowfall days, and 8.19" (208mm) of snow is accumulated.

Daylight

The average length of the day in January in Clayton is 9h and 50min.
On the first day of the month, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of January, sunrise is at 7:07 am and sunset at 5:21 pm CST.

Sunshine

January has the least sunshine of the year in Clayton, with an average of 4.6h of sunshine.

UV index

The months with the lowest UV index in Clayton are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 2 during January morphs into the following directions:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Resources | Updated: Feb 12, 2024 | Published by: Weather U.S.

Frequently asked questions

What month is the coldest in Clayton?

January is Clayton's coldest month, registering average high temperatures of 37.8°F (3.2°C) and lows of 24.3°F (-4.3°C).

How cold is it in Clayton in January?

In Clayton, 37.8°F (3.2°C) is the average high-temperature and 24.3°F (-4.3°C) is the average low-temperature during January.

What is the average humidity in January in Clayton?

The average relative humidity in January in Clayton, Missouri, is 75%.

How much does it rain in Clayton in January?

In January, in Clayton, the rain falls for 6.5 days. Throughout January, 1.73" (44mm) of precipitation is accumulated.

How many days does it snow in January in Clayton?

In Clayton, during January, snow falls for 4.7 days and regularly aggregates up to 2.24" (57mm) of snow.

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

In Clayton, Missouri, the average day length in January is 9h and 50min.

When is the sunrise / sunset in January in Clayton?

On the first day of January, sunrise is at 7:19 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 5:21 pm CST.

What is the month with the least sunshine in Clayton?

January has the least sunshine of the year in Clayton, Missouri, with an average of 4.6h of sunshine.

How many hours of sunshine does Clayton have in January?

The average sunshine duration in January is 4.6h.

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

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

What is the UV index intensity in January in Clayton?

The average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from 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
Clayton, MO

Average temperature in January - Clayton, MO
  • Average high temperature in January: 37.8°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in January: 24.3°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

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Average pressure in January
Clayton, MO

Average pressure in January - Clayton, MO
  • Average pressure in January: 30.16"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in January
Clayton, MO

Average wind speed in January - Clayton, MO
  • Average wind speed in January: 9.2mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in January
Clayton, MO

Average humidity in January - Clayton, MO
  • Average humidity in January: 75%

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in January
Clayton, MO

Average rainfall in January - Clayton, MO
  • Average rainfall in January: 1.73"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

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Average rainfall days in January
Clayton, MO

Average rainfall days in January - Clayton, MO
  • Average rainfall days in January: 6.5 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

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Average snowfall in January
Clayton, MO

Average snowfall in January - Clayton, MO
  • Average snowfall in January: 2.24"

The month with the highest snowfall is February (2.6").
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
Clayton, MO

Average snowfall days in January - Clayton, MO
  • Average snowfall days in January: 4.7 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

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Average daylight in January /
Average sunshine in January
Clayton, MO

Average daylight in January / Average sunshine in January - Clayton, MO
  • Average daylight in January: 9h and 5min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in January: 4h and 4min

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

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Average sunshine days in January
Clayton, MO

Average sunshine days in January - Clayton, MO
  • Average sunshine days in January: 21 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

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Average UV index in January
Clayton, MO

Average UV index in January - Clayton, MO
  • 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, February and December (UV index 2).

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Average cloud cover in January
Clayton, MO

Average cloud cover in January - Clayton, MO
  • Average cloud cover in January: 50

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in January
Clayton, MO

Average visibility in January - Clayton, MO
  • 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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Clayton, Missouri, USA

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