December weather forecast
Napoleon, MO

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Weather in December

December, the first month of the winter in Napoleon, is also an icy month, with temperature in the range of an average high of 40.3°F (4.6°C) and an average low of 27.1°F (-2.7°C).

Temperature

The move into December indicates a reduction in the average high-temperature, down from November's cool 52.3°F (11.3°C) to a wintry 40.3°F (4.6°C). During December, Napoleon experiences a consistent low-temperature average of 27.1°F (-2.7°C).

Humidity

In December, the average relative humidity is 75%.

Rainfall

In December, the rain falls for 5.6 days. Throughout December, 1.54" (39mm) of precipitation is accumulated. In Napoleon, during the entire year, the rain falls for 136.3 days and collects up to 27.28" (693mm) of precipitation.

Snowfall

Months with snowfall are January through March, May, October through December. In December, in Napoleon, it is snowing for 3.5 days. Throughout December, 1.14" (29mm) of snow is accumulated. Throughout the year, there are 16.7 snowfall days, and 8.86" (225mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:17 am and sunset at 4:54 pm. On the last day of December, sunrise is at 7:35 am and sunset at 5:03 pm CST.

Sunshine

In Napoleon, the average sunshine in December is 5.2h.

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 reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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 Napoleon, 40.3°F (4.6°C) is the average high-temperature and 27.1°F (-2.7°C) is the average low-temperature during December. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, in August is appraised at 95°F (35°C).

What is the average humidity in December?

In December, the average relative humidity is 75%.

How many days does it rain in December?

In Napoleon, in December, it is raining for 5.6 days, with typically 1.54" (39mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 3.5 days. Throughout December, 1.14" (29mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 9h and 28min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:17 am and sunset at 4:54 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 5:03 pm CST.

How long on average sun shines in December?

In December, the average sunshine duration is 5.2h.

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.

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 low health risk 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
Napoleon, MO

Average temperature in December - Napoleon, MO
  • Average high temperature in December: 40.3°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 (36.5°F).

  • Average low temperature in December: 27.1°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

Average pressure in December
Napoleon, MO

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

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).

Average wind speed in December
Napoleon, MO

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

The windiest month (with the highest average wind speed) is March (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

Average humidity in December
Napoleon, MO

Average humidity in December - Napoleon, MO
  • Average humidity in December: 75%

The months with the highest relative humidity are May and June (79%).
The months with the lowest relative humidity are October and November (71%).

Average rainfall in December
Napoleon, MO

Average rainfall in December - Napoleon, MO
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is May (3.62").
The driest month (with the least rainfall) is January (0.94").

Average rainfall days in December
Napoleon, MO

Average rainfall days in December - Napoleon, MO
  • Average rainfall days in December: 5.6 days

The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (5.4 days).

Average snowfall in December
Napoleon, MO

Average snowfall in December - Napoleon, MO
  • Average snowfall in December: 1.14"

The month with the highest snowfall is February (3.35").
The months with the least snowfall are April, June, July, August and September (0").

Average snowfall days in December
Napoleon, MO

Average snowfall days in December - Napoleon, MO
  • Average snowfall days in December: 3.5 days

The month with the highest number of snowfall days is February (4.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Napoleon, 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 24min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).

Average sunshine days in December
Napoleon, MO

Average sunshine days in December - Napoleon, MO
  • Average sunshine days in December: 22 days

The month with the most sunshine days is December (22 days).
The months with the least sunshine days are May and June (11.6 days).

Average UV index in December
Napoleon, MO

Average UV index in December - Napoleon, 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
Napoleon, MO

Average cloud cover in December - Napoleon, MO
  • Average cloud cover in December: 42

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 26).

Average visibility in December
Napoleon, MO

Average visibility in December - Napoleon, 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).

Napoleon, Missouri, USA

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