December weather forecast
Rolla, MO

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Weather in December

December heralds the arrival of winter in Rolla. The temperatures continue to drop, captivating the city in a chilly grip. Rainfall becomes less, but snowfall drastically increases, frosting the city in sparkling white. December turns Rolla into a winter wonderland, paving the way for winter activities like sledding and snowman building. In December, the weather allows for temperatures as low as 29.3°F (-1.5°C), creating a magical winter atmosphere.

Temperature

As December commences, the average high-temperature shows a reduction, transitioning from a cool 53.6°F (12°C) in November to a chilly 43.2°F (6.2°C). In the month of December, the average temperature in Rolla, Missouri, dips to a freezing cold 29.3°F (-1.5°C) during the night.

Humidity

The average relative humidity in December is 76%.

Rainfall

In Rolla, during December, the rain falls for 7 days and regularly aggregates up to 1.93" (49mm) of precipitation. In Rolla, during the entire year, the rain falls for 147.2 days and collects up to 31.02" (788mm) of precipitation.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 5 days. Throughout December, 2.28" (58mm) of snow is accumulated. Throughout the year, there are 24.7 snowfall days, and 11.1" (282mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:58 pm CST.

Sunshine

The average sunshine in December is 5h.

UV index

The months with the lowest UV index in Rolla are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In December, the UV index of 2 transforms into the following advice:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
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Frequently asked questions

How cold does it get in Rolla in December?

An average high-temperature, in December, in Rolla, is 43.2°F (6.2°C) and the average low-temperature is 29.3°F (-1.5°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is estimated at 100.4°F (38°C).

What is the average humidity in December in Rolla?

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

How many days does it rain in December in Rolla?

In Rolla, Missouri, in December, it is raining for 7 days, with typically 1.93" (49mm) of accumulated precipitation.

How much does it snow in Rolla in December?

In Rolla, during December, snow falls for 5 days and regularly aggregates up to 2.28" (58mm) of snow.

What is the month with the shortest days in Rolla?

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

What is the average length of the day in December in Rolla?

In December, the average day length is 9h and 35min.

When are sunrise and sunset in December in Rolla?

On the first day of December, sunrise is at 7:04 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:58 pm CST.

How many hours of sunshine does Rolla have in December?

The average sunshine duration in December is 5h.

What is the month with the lowest UV index in Rolla?

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

What is the UV index reading in December in Rolla?

In Rolla, Missouri, 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 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
Rolla, MO

Average temperature in December - Rolla, MO
  • Average high temperature in December: 43.2°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is January (39.2°F).

  • Average low temperature in December: 29.3°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 (24.4°F).

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Average pressure in December
Rolla, MO

Average pressure in December - Rolla, 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).

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Average wind speed in December
Rolla, MO

Average wind speed in December - Rolla, MO
  • Average wind speed in December: 8.3mph

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in December
Rolla, MO

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

The months with the highest relative humidity are March and May (77%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in December
Rolla, MO

Average rainfall in December - Rolla, MO
  • Average rainfall in December: 1.93"

The wettest month (with the highest rainfall) is May (3.98").
The driest month (with the least rainfall) is November (1.65").

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Average rainfall days in December
Rolla, MO

Average rainfall days in December - Rolla, MO
  • Average rainfall days in December: 7 days

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is December (7 days).

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Average snowfall in December
Rolla, MO

Average snowfall in December - Rolla, MO
  • Average snowfall in December: 2.28"

The month with the highest snowfall is February (3.46").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Rolla, MO

Average snowfall days in December - Rolla, MO
  • Average snowfall days in December: 5 days

The month with the highest number of snowfall days is January (7.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Rolla, MO
  • Average daylight in December: 9h and 4min

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 36min).

  • Average sunshine in December: 5h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Rolla, MO

Average sunshine days in December - Rolla, MO
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is May (11.4 days).

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Average UV index in December
Rolla, MO

Average UV index in December - Rolla, 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).

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Average cloud cover in December
Rolla, MO

Average cloud cover in December - Rolla, MO
  • Average cloud cover in December: 47

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

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Average visibility in December
Rolla, MO

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

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

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Rolla, Missouri, USA

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