December 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 temperature in December in St. Louis?

The average high-temperature, in December, is 42.4°F (5.8°C), while the average low-temperature is 27°F (-2.8°C).

What is the most humid month in St. Louis?

December is the most humid month in St. Louis, Missouri, with an average relative humidity of 75.8%.

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

The average relative humidity in December in St. Louis, Missouri, is 75.8%.

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

In December, in St. Louis, the rain falls for 9.4 days. Throughout December, 2.8" (72.1mm) of precipitation is accumulated.

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

In St. Louis, Missouri, during December, snow falls for 3.7 days and regularly aggregates up to 4.4" (111.8mm) of snow.

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

Months with the lowest UV index are January and December, with an average UV index of 2.

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

In St. Louis, Missouri, the average UV index in December is 2.
Average temperature in December - St. Louis, MO
  • Average high temperature in December: 5.8°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 December: -2.8°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 December - St. Louis, MO
  • Average humidity in December: 75.8%

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 December - St. Louis, MO
  • Average rainfall in December: 72.1mm

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 December - St. Louis, MO
  • Average rainfall days in December: 9.4 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 December - St. Louis, MO
  • Average snowfall in December: 111.8mm

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 December - St. Louis, MO
  • Average snowfall days in December: 3.7 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 December / Average sunshine in December - St. Louis, MO
  • Average daylight in December: 9.5h

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 December: 4.2h

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