December weather forecast
Eureka, MO

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Weather in December

December, the first month of the winter in Eureka, is also a frosty month, with an average temperature fluctuating between 43.3°F (6.3°C) and 30.2°F (-1°C).

Temperature

December suggests a modest reduction in the average high-temperature, shifting from a cool 53.8°F (12.1°C) in November to a frosty 43.3°F (6.3°C). During the month of December, the temperature generally drops to a low average of 30.2°F (-1°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Eureka, during December, the rain falls for 6.1 days and regularly aggregates up to 1.42" (36mm) of precipitation. In Eureka, during the entire year, the rain falls for 134.1 days and collects up to 23.82" (605mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. December is the month with the most snowfall in Eureka. Snow falls for 4.1 days and accumulates 1.3" (33mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:01 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:51 pm CST.

Sunshine

The average sunshine in December is 4.8h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 2 suggests this advice:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.

Frequently asked questions

Is it cold during December?

In Eureka, in December, the average high-temperature is 43.3°F (6.3°C), and the average low-temperature is 30.2°F (-1°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 98.6°F (37°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How much does it rain in December?

In Eureka, during December, the rain falls for 6.1 days and regularly aggregates up to 1.42" (36mm) of precipitation.

When does it snow the most?

The month with the most snowfall is December, when snow falls for 4.1 days and typically aggregates up to 1.3" (33mm) of snow.

How many days does it snow in December in Eureka?

In Eureka, in December, snow falls for 4.1 days, with typically accumulated 1.3" (33mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year in Eureka, with an average of 9h and 30min of daylight.

How many hours of daylight does Eureka have in December?

In December, the average day length is 9h and 32min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:01 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:51 pm CST.

How long on average sun shines in December?

The average sunshine duration in December is 4.8h.

What is the month with 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 reading of 2, and below, represents a minimal hazard to health from unprotected exposure to 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
Eureka, MO

Average temperature in December - Eureka, MO
  • Average high temperature in December: 43.3°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (38.5°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).

Average pressure in December
Eureka, MO

Average pressure in December - Eureka, 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 (29.92"Hg).

Average wind speed in December
Eureka, MO

Average wind speed in December - Eureka, MO
  • Average wind speed in December: 8.1mph

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
Eureka, MO

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

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Eureka, MO

Average rainfall in December - Eureka, MO
  • Average rainfall in December: 1.42"

The wettest month (with the highest rainfall) is May (3.03").
The driest month (with the least rainfall) is February (1.1").

Average rainfall days in December
Eureka, MO

Average rainfall days in December - Eureka, MO
  • Average rainfall days in December: 6.1 days

The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is December (6.1 days).

Average snowfall in December
Eureka, MO

Average snowfall in December - Eureka, MO
  • Average snowfall in December: 1.3"

The month with the highest snowfall is December (1.3").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Eureka, MO

Average snowfall days in December - Eureka, MO
  • Average snowfall days in December: 4.1 days

The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are May, June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Eureka, MO
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in December
Eureka, MO

Average sunshine days in December - Eureka, MO
  • Average sunshine days in December: 20.3 days

The month with the most sunshine days is December (20.3 days).
The month with the least sunshine days is May (12.6 days).

Average UV index in December
Eureka, MO

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

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 2).

Average cloud cover in December
Eureka, MO

Average cloud cover in December - Eureka, MO
  • Average cloud cover in December: 48

The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).

Average visibility in December
Eureka, MO

Average visibility in December - Eureka, 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).

Eureka, Missouri, USA

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