December weather forecast
Seymour, MO

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Weather in December

The first month of the winter, December, is also a frosty month in Seymour, Missouri, with an average temperature fluctuating between 44.2°F (6.8°C) and 29.8°F (-1.2°C).

Temperature

In the transition to December, Seymour observes a drop in the average high-temperature, moving from a cool 54.1°F (12.3°C) in November to a chilly 44.2°F (6.8°C). Seymour reports an average nighttime low-temperature of 29.8°F (-1.2°C) in December.

Humidity

The average relative humidity in December is 76%.

Rainfall

In Seymour, in December, it is raining for 8.5 days, with typically 2.13" (54mm) of accumulated precipitation. In Seymour, during the entire year, the rain falls for 159.6 days and collects up to 36.22" (920mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Seymour, during December, snow falls for 3.9 days and regularly aggregates up to 1.46" (37mm) of snow. In Seymour, during the entire year, snow falls for 21.8 days and aggregates up to 10.75" (273mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 42min of daylight.
On the first day of the month, sunrise is at 7:06 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:24 am and sunset at 5:04 pm CST.

Sunshine

In December, the average sunshine is 5.3h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. When the Sun's UV radiation is most intense during midday, it's best to find shade and limit exposure. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

December temperatures vary between a high-temperature of 44.2°F (6.8°C) and a low-temperature of 29.8°F (-1.2°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 96.8°F (36°C).

What is the average humidity in December?

The average relative humidity in December is 76%.

How many days does it rain in December?

In Seymour, during December, the rain falls for 8.5 days and regularly aggregates up to 2.13" (54mm) of precipitation.

How many days does it snow in December?

In Seymour, in December, during 3.9 snowfall days, 1.46" (37mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 42min of daylight.

How many hours of daylight does Seymour have in December?

The average day length in December is 9h and 40min.

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 4:54 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:04 pm CST.

How long on average sun shines in December?

The average sunshine duration in December is 5.3h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal hazard to health from exposure to the Sun's UV radiation.
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
Seymour, MO

Average temperature in December - Seymour, MO
  • Average high temperature in December: 44.2°F

The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (25.9°F).

Average pressure in December
Seymour, MO

Average pressure in December - Seymour, MO
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Seymour, MO

Average wind speed in December - Seymour, MO
  • Average wind speed in December: 9mph

The windiest months (with the highest average wind speed) are January and March (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).

Average humidity in December
Seymour, MO

Average humidity in December - Seymour, MO
  • Average humidity in December: 76%

The months with the highest relative humidity are March and May (78%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Seymour, MO

Average rainfall in December - Seymour, MO
  • Average rainfall in December: 2.13"

The wettest month (with the highest rainfall) is May (4.84").
The driest month (with the least rainfall) is January (1.77").

Average rainfall days in December
Seymour, MO

Average rainfall days in December - Seymour, MO
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
Seymour, MO

Average snowfall in December - Seymour, MO
  • Average snowfall in December: 1.46"

The month with the highest snowfall is February (3.5").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Seymour, MO

Average snowfall days in December - Seymour, MO
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Seymour, MO

Average daylight in December / Average sunshine in December - Seymour, 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 42min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in December
Seymour, MO

Average sunshine days in December - Seymour, MO
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is October (19.6 days).
The month with the least sunshine days is May (10.5 days).

Average UV index in December
Seymour, MO

Average UV index in December - Seymour, MO
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Seymour, MO

Average cloud cover in December - Seymour, MO
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 29).

Average visibility in December
Seymour, MO

Average visibility in December - Seymour, MO
  • Average visibility in December: 6mi

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

Seymour, Missouri, USA

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