December weather forecast
Armstrong, MO

Share

Weather in December

The first month of the winter, December, is also an icy month in Armstrong, Missouri, with an average temperature ranging between min 27.7°F (-2.4°C) and max 40.8°F (4.9°C).

Temperature

During the transition into December, Armstrong observes a decrease in the average high-temperature, falling from a cool 52.3°F (11.3°C) in November to a wintry 40.8°F (4.9°C). In Armstrong, an average nighttime temperature of 27.7°F (-2.4°C) is expected during December.

Humidity

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

Rainfall

In December, the rain falls for 4.3 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. In Armstrong, during the entire year, the rain falls for 102.5 days and collects up to 10.91" (277mm) of precipitation.

Snowfall

January through March, October through December are months with snowfall. In December, it is snowing for 3.1 days. Throughout December, 0.59" (15mm) of snow is accumulated. In Armstrong, during the entire year, snow falls for 17.3 days and aggregates up to 2.99" (76mm) of snow.

Daylight

December has the shortest days of the year in Armstrong, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:12 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:30 am and sunset at 4:57 pm CST.

Sunshine

The average sunshine in December is 5.1h.

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 value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. 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. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

In December, in Armstrong, the average high-temperature is 40.8°F (4.9°C), and the average low-temperature is 27.7°F (-2.4°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is evaluated at 96.8°F (36°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How much does it rain in Armstrong in December?

In December, the rain falls for 4.3 days. Throughout December, 0.59" (15mm) of precipitation is accumulated.

How many days does it snow in December?

In Armstrong, in December, snow falls for 3.1 days, with typically accumulated 0.59" (15mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 28min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:12 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 4:57 pm CST.

How long on average sun shines in December?

In Armstrong, the average sunshine duration in December is 5.1h.

When is the lowest UV index in Armstrong?

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

How high is the UV index in December in Armstrong?

In Armstrong, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Armstrong, MO

Average temperature in December - Armstrong, MO
  • Average high temperature in December: 40.8°F

The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in December: 27.7°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 (22.6°F).

Average pressure in December
Armstrong, MO

Average pressure in December - Armstrong, 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 (29.91"Hg).

Average wind speed in December
Armstrong, MO

Average wind speed in December - Armstrong, MO
  • Average wind speed in December: 9.1mph

The windiest months (with the highest average wind speed) are January and March (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).

Average humidity in December
Armstrong, MO

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

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Armstrong, MO

Average rainfall in December - Armstrong, MO
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is January (0.43").

Average rainfall days in December
Armstrong, MO

Average rainfall days in December - Armstrong, MO
  • Average rainfall days in December: 4.3 days

The month with the highest number of rainy days is May (13.2 days).
The months with the least rainy days are February and December (4.3 days).

Average snowfall in December
Armstrong, MO

Average snowfall in December - Armstrong, MO
  • Average snowfall in December: 0.59"

The month with the highest snowfall is February (0.98").
The months with the least snowfall are April, May, June, July, August and September (0").

Average snowfall days in December
Armstrong, MO

Average snowfall days in December - Armstrong, MO
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is January (5.5 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).

Average sunshine days in December
Armstrong, MO

Average sunshine days in December - Armstrong, MO
  • Average sunshine days in December: 23.6 days

The month with the most sunshine days is December (23.6 days).
The month with the least sunshine days is May (15.2 days).

Average UV index in December
Armstrong, MO

Average UV index in December - Armstrong, 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
Armstrong, MO

Average cloud cover in December - Armstrong, MO
  • Average cloud cover in December: 45

The months with the most cloud cover are January and February (Cloud cover 48).
The months with the least cloud cover are June, July and August (Cloud cover 27).

Average visibility in December
Armstrong, MO

Average visibility in December - Armstrong, 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).

Armstrong, Missouri, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location