January Weather forecast - Winter forecast

Weather in January
Frequently asked questions
Average temperature in January
Average humidity in January
Average rainfall in January
Average rainfall days in January
Average snowfall in January
Average snowfall days in January
Average daylight in January
Average sunshine in January
Average UV index in January

A beautiful twilight over the Gateway Arch in St. Louis, Missouri

Weather in January

January, the same as December, is a wintry winter month in St. Louis, Missouri, with temperature in the range of an average low of 23.7°F (-4.6°C) and an average high of 39.9°F (4.4°C).

Temperature

The coldest month in St. Louis, Missouri, is January, with an average high-temperature of 39.9°F (4.4°C) and an average low-temperature of 23.7°F (-4.6°C).

Humidity

In January, the average relative humidity in St. Louis is 73%.

Rainfall

In St. Louis, during January, the rain falls for 8.9 days and regularly aggregates up to 2.4" (61mm) of precipitation. In St. Louis, during the entire year, the rain falls for 112.6 days and collects up to 40.94" (1040mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in St. Louis. January is the month with the most snowfall in St. Louis. Snow falls for 4.7 days and accumulates 5.59" (142mm) of snow.

Daylight

In January, the average length of the day in St. Louis is 9h and 50min.
On the first day of January in St. Louis, sunrise is at 7:18 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.

Sunshine

The average sunshine in January in St. Louis is 5.2h.

UV index

The months with the lowest UV index in St. Louis are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in January interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

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FAQ

What is the coldest month in St. Louis?

With an average high-temperature of 39.9°F (4.4°C) and an average low-temperature of 23.7°F (-4.6°C), January is the coldest month.

What is the temperature in January in St. Louis?

In St. Louis, Missouri, in January, the average high-temperature is 39.9°F (4.4°C), and the average low-temperature is 23.7°F (-4.6°C).

What is the average humidity in January in St. Louis?

The average relative humidity in January in St. Louis, Missouri, is 73%.

How much does it rain in St. Louis in January?

In St. Louis, Missouri, in January, during 8.9 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

What is the snowiest month in St. Louis?

The month with the most snowfall in St. Louis, Missouri, is January, when snow falls for 4.7 days and typically aggregates up to 5.59" (142mm) of snow.

How much does it snow in St. Louis in January?

In St. Louis, Missouri, in January, during 4.7 snowfall days, 5.59" (142mm) of snow is typically accumulated.

What is the average length of the day in January in St. Louis?

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

When are sunrise and sunset in January in St. Louis?

In January, on the first day of the month, sunrise is at 7:18 am and sunset at 4:50 pm. On the last day of the month, in St. Louis, sunrise is at 7:07 am and sunset at 5:21 pm CST.

How long on average sun shines in January in St. Louis?

In St. Louis, Missouri, the average sunshine duration in January is 5.2h.

What are the months with the lowest UV index in St. Louis?

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

What is the UV index intensity in January in St. Louis?

The average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.

Today

Tomorrow

Long-term

Year January F M A M J J A S O N D

Dec

January

Feb

Average high temperature

42.5°F 5.8°C

39.9°F 4.4°C

45°F 7.2°C

Average low temperature

Average humidity

Average rainfall

Average rainfall days

Average snowfall

Average snowfall days

Average daylight

Average sunshine

Average UV index

Average temperature in January
St. Louis, MO

Average high temperature in January: 39.9°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.9°F).

Average low temperature in January: 23.7°F

The month with the highest average low temperature is July (71°F).
The coldest month (with the lowest average low temperature) is January (23.7°F).

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Average humidity in January
St. Louis, MO

Average humidity in January: 73%

The month with the highest relative humidity is December (75.8%).
The month with the lowest relative humidity is April (63.5%).

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Average rainfall in January
St. Louis, MO

Average rainfall in January: 2.4"

The wettest month (with the highest rainfall) is May (4.7").
The driest month (with the least rainfall) is February (2.2").

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Average rainfall days in January
St. Louis, MO

Average rainfall days in January: 8.9 days

The month with the highest number of rainy days is May (11.9 days).
The month with the least rainy days is September (7.4 days).

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Average snowfall in January
St. Louis, MO

Average snowfall in January: 5.6"

The month with the highest snowfall is January (5.6").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
St. Louis, MO

Average snowfall days in January: 4.7 days

The month with the highest number of snowfall days is January (4.7 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
St. Louis, 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: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).

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Average UV index in January
St. Louis, MO

Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 9).
The months with the lowest UV index are January and December (UV index 2).

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January weather forecast
St. Louis, MO

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