December weather forecast
Iron Mountain Lake, MO

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Weather in December

The first month of the winter, December, is still a chilly month in Iron Mountain Lake, Missouri, with an average temperature fluctuating between 30.2°F (-1°C) and 43.7°F (6.5°C).

Temperature

With December's arrival, Iron Mountain Lake sees a decrease in average high-temperatures, moving from a fresh 53.2°F (11.8°C) in November to a chilly 43.7°F (6.5°C). Throughout December nights, Iron Mountain Lake experiences a consistent temperature average of 30.2°F (-1°C).

Humidity

In Iron Mountain Lake, the average relative humidity in December is 77%.

Rainfall

In Iron Mountain Lake, in December, it is raining for 7.9 days, with typically 2.36" (60mm) of accumulated precipitation. Throughout the year, in Iron Mountain Lake, there are 154.7 rainfall days, and 32.64" (829mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Iron Mountain Lake, during December, snow falls for 5 days and regularly aggregates up to 1.77" (45mm) of snow. In Iron Mountain Lake, during the entire year, snow falls for 22.6 days and aggregates up to 9.06" (230mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 6:59 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:17 am and sunset at 4:54 pm CST.

Sunshine

In Iron Mountain Lake, Missouri, the average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Extended time in the sun generally does not harm most, but those with sensitive skin, infants, and children should always be protected. Around midday, solar radiation is most harmful; hence, exposure should be limited. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

An average high-temperature, in December, in Iron Mountain Lake, is 43.7°F (6.5°C) and the average low-temperature is 30.2°F (-1°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is appraised at 100.4°F (38°C).

What is the average humidity in December?

In Iron Mountain Lake, the average relative humidity in December is 77%.

How many days does it rain in December?

In December, the rain falls for 7.9 days. Throughout December, 2.36" (60mm) of precipitation is accumulated.

How much does it snow in December?

In Iron Mountain Lake, during December, snow falls for 5 days and regularly aggregates up to 1.77" (45mm) of snow.

What is the month with the shortest days in Iron Mountain Lake?

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

How many hours of daylight does Iron Mountain Lake have in December?

In Iron Mountain Lake, the average day length in December is 9h and 37min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:54 pm CST.

How many hours of sunshine does Iron Mountain Lake have in December?

The average sunshine duration in December is 4.9h.

When is the lowest UV index?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability 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
Iron Mountain Lake, MO

Average temperature in December - Iron Mountain Lake, MO
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (39.6°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (25.2°F).

Average pressure in December
Iron Mountain Lake, MO

Average pressure in December - Iron Mountain Lake, 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
Iron Mountain Lake, MO

Average wind speed in December - Iron Mountain Lake, MO
  • Average wind speed in December: 8mph

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Iron Mountain Lake, MO

Average humidity in December - Iron Mountain Lake, MO
  • Average humidity in December: 77%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Iron Mountain Lake, MO

Average rainfall in December - Iron Mountain Lake, MO
  • Average rainfall in December: 2.36"

The wettest month (with the highest rainfall) is May (3.78").
The driest month (with the least rainfall) is September (1.77").

Average rainfall days in December
Iron Mountain Lake, MO

Average rainfall days in December - Iron Mountain Lake, MO
  • Average rainfall days in December: 7.9 days

The month with the highest number of rainy days is July (17.2 days).
The month with the least rainy days is December (7.9 days).

Average snowfall in December
Iron Mountain Lake, MO

Average snowfall in December - Iron Mountain Lake, MO
  • Average snowfall in December: 1.77"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Iron Mountain Lake, MO

Average snowfall days in December - Iron Mountain Lake, MO
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is February (6.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Iron Mountain Lake, MO

Average daylight in December / Average sunshine in December - Iron Mountain Lake, 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: 4h and 5min

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: 4h and 48min).

Average sunshine days in December
Iron Mountain Lake, MO

Average sunshine days in December - Iron Mountain Lake, MO
  • Average sunshine days in December: 18.9 days

The months with the most sunshine days are November and December (18.9 days).
The month with the least sunshine days is July (10.9 days).

Average UV index in December
Iron Mountain Lake, MO

Average UV index in December - Iron Mountain Lake, 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, November and December (UV index 2).

Average cloud cover in December
Iron Mountain Lake, MO

Average cloud cover in December - Iron Mountain Lake, MO
  • Average cloud cover in December: 48

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 29).

Average visibility in December
Iron Mountain Lake, MO

Average visibility in December - Iron Mountain Lake, MO
  • Average visibility in December: 6mi

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

Iron Mountain Lake, Missouri, USA

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