December weather forecast
Saint Robert, MO

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Weather in December

The first month of the winter, December, is also a frosty month in Saint Robert, Missouri, with an average temperature varying between 29.7°F (-1.3°C) and 43.7°F (6.5°C).

Temperature

The shift to December brings a decrease in the average high-temperature, falling from a cool 54.3°F (12.4°C) in November to a frosty 43.7°F (6.5°C). An average nighttime temperature of 29.7°F (-1.3°C) is observed during December.

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Saint Robert, during December, the rain falls for 7.5 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Saint Robert, during the entire year, the rain falls for 147.7 days and collects up to 31.46" (799mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 5 days. Throughout December, 1.93" (49mm) of snow is accumulated. Throughout the year, there are 23.8 snowfall days, and 10.12" (257mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 7:06 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:59 pm CST.

Sunshine

In December, the average sunshine is 5.2h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for average individuals.
Note: A daily maximum UV index of 2 in December translates into the following instructions:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature during December is 43.7°F (6.5°C) and the low-temperature is 29.7°F (-1.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is calculated to be 100.4°F (38°C).

What is the average humidity in December?

In Saint Robert, the average relative humidity in December is 76%.

How much does it rain in December?

In Saint Robert, in December, it is raining for 7.5 days, with typically 1.85" (47mm) of accumulated precipitation.

How much does it snow in Saint Robert in December?

In Saint Robert, during December, snow falls for 5 days and regularly aggregates up to 1.93" (49mm) of snow.

What is the month with the shortest days?

With an average of 9h and 36min of daylight, December has the shortest days of the year.

How many hours of daylight does Saint Robert have in December?

The average day length in December in Saint Robert is 9h and 36min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:59 pm CST.

How many hours of sunshine does Saint Robert have in December?

In December, the average sunshine duration is 5.2h.

When is the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk 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 December
Saint Robert, MO

Average temperature in December - Saint Robert, MO
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in December
Saint Robert, MO

Average pressure in December - Saint Robert, MO
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Saint Robert, MO

Average wind speed in December - Saint Robert, MO
  • Average wind speed in December: 8.3mph

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in December
Saint Robert, MO

Average humidity in December - Saint Robert, MO
  • Average humidity in December: 76%

The months with the highest relative humidity are March and May (77%).
The months with the lowest relative humidity are August, September and October (73%).

Average rainfall in December
Saint Robert, MO

Average rainfall in December - Saint Robert, MO
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (1.61").

Average rainfall days in December
Saint Robert, MO

Average rainfall days in December - Saint Robert, MO
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is December (7.5 days).

Average snowfall in December
Saint Robert, MO

Average snowfall in December - Saint Robert, MO
  • Average snowfall in December: 1.93"

The month with the highest snowfall is February (3.54").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Saint Robert, MO

Average snowfall days in December - Saint Robert, MO
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is February (7.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Saint Robert, MO

Average daylight in December / Average sunshine in December - Saint Robert, MO
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The months with the least sunshine are January and February (Average sunshine: 4h and 54min).

Average sunshine days in December
Saint Robert, MO

Average sunshine days in December - Saint Robert, MO
  • Average sunshine days in December: 19 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is May (11.7 days).

Average UV index in December
Saint Robert, MO

Average UV index in December - Saint Robert, MO
  • Average UV index in December: 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).

Average cloud cover in December
Saint Robert, MO

Average cloud cover in December - Saint Robert, MO
  • Average cloud cover in December: 46

The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in December
Saint Robert, MO

Average visibility in December - Saint Robert, MO
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).

Saint Robert, Missouri, USA

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