January weather forecast and climate
St. Louis, MO

A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront
A beautiful twilight view of the Gateway Arch in St. Louis, Missouri, with a distant view of the city buildings mirrored in the waterfront

What is the coldest month in St. Louis?

The coldest month 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).

What is the temperature in January in St. Louis?

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

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

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

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

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

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

In St. Louis, Missouri, during January, snow falls for 4.7 days and regularly aggregates up to 5.6" (142.2mm) of snow.

What is the snowiest month in St. Louis?

The month with the most snowfall is January when snow falls for 4.7 days and typically aggregates up to 5.6" (142.2mm) of snow.

What is the month with the lowest UV index in St. Louis?

January and December, with an average UV index of 2, are months with the lowest UV index in St. Louis, Missouri.

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

In St. Louis, the average UV index in January is 2.
Average temperature in January - St. Louis, MO
  • Average high temperature in January: 4.4°C

The warmest month (with the highest average high temperature) is July (31.7°C).
The month with the lowest average high temperature is January (4.4°C).

  • Average low temperature in January: -4.6°C

The month with the highest average low temperature is July (21.7°C).
The coldest month (with the lowest average low temperature) is January (-4.6°C).

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%).

Average rainfall in January - St. Louis, MO
  • Average rainfall in January: 61mm

The wettest month (with the highest rainfall) is May (119.9mm).
The driest month (with the lowest rainfall) is February (56.9mm).

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 lowest number of rainy days is September (7.4 days).

Average snowfall in January - St. Louis, MO
  • Average snowfall in January: 142.2mm

The month with the highest snowfall is January (142.2mm).
Months with the lowest snowfall are May, June, July, August, September and October (0mm).

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).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

Average daylight in January / Average sunshine in January - St. Louis, MO
  • Average daylight in January: 9.8h

The month with the longest days is June (Average daylight: 14.8h).
The month with shortest days is December (Average daylight: 9.5h).

  • Average sunshine in January: 5.2h

The month with most sunshine is July (Average sunshine: 10h).
The month with least sunshine is December (Average sunshine: 4.2h).

Average UV index in January - St. Louis, MO
  • Average UV index in January: 2

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

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