St. Louis
Missouri, USA
Long-term weather forecast
Long-term weather forecast

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
Enero, the same as Diciembre, is a wintry winter month in St. Louis, with average temperature varying between 39.9°F (4.4°C) and 23.7°F (-4.6°C).

Temperature

Enero 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).

Humidity

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

Rainfall

In Enero, in St. Louis, the rain falls for 8.9 days. Throughout Enero, 2.4" (61mm) of precipitation is accumulated. Throughout the year, in St. Louis, Missouri, there are 112.6 rainfall days, and 40.96" (1040.3mm) of precipitation is accumulated.

Snowfall

Enero through Abril, Noviembre and Diciembre are months with snowfall in St. Louis. The month with the most snowfall in St. Louis, Missouri, is Enero when snow falls for 4.7 days and typically aggregates up to 5.6" (142.2mm) of snow.

Daylight

In Enero, the average length of the day in St. Louis is 9.8h.

Sunshine

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

UV index

Enero and Diciembre, with an average maximum UV index of 2, are months with the lowest UV index in St. Louis. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 2 transform into the following instructions:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in St. Louis?

The coldest month in St. Louis, Missouri, is Enero, 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 Enero in St. Louis?

In St. Louis, Missouri, in Enero, 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 Enero in St. Louis?

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

How many days does it rain in Enero in St. Louis?

In St. Louis, Missouri, in Enero, it is raining for 8.9 days, with typically 2.4" (61mm) of accumulated precipitation.

How many days does it snow in Enero in St. Louis?

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

When does it snow the most in St. Louis?

Enero is the month with the most snowfall. Snow falls for 4.7 days and accumulates 5.6" (142.2mm) of snow.

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

In St. Louis, Missouri, the average length of the day in Enero is 9.8h.

How many hours of sunshine does St. Louis have in Enero?

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

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

Enero and Diciembre, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in Enero in St. Louis?

In St. Louis, Missouri, the average daily maximum UV index in Enero is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from the exposure to the Sun's UV radiation.
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).

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: 2.4"

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

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: 5.6"

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

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).