December weather forecast
Roby, MO

Share

Weather in December

The first month of the winter, December, is also a frosty month in Roby, Missouri, with an average temperature fluctuating between 43.5°F (6.4°C) and 29.5°F (-1.4°C).

Temperature

The onset of December coincides with a reduction in the average high-temperature, falling from a cool 53.8°F (12.1°C) in November to a frosty 43.5°F (6.4°C). In December, the temperature drops to an average of 29.5°F (-1.4°C) at night.

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Roby, Missouri, in December, during 7.5 rainfall days, 2.01" (51mm) of precipitation is typically accumulated. In Roby, during the entire year, the rain falls for 148.9 days and collects up to 32.4" (823mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Roby, in December, during 3.9 snowfall days, 1.81" (46mm) of snow is typically accumulated. Throughout the year, there are 20.1 snowfall days, and 9.96" (253mm) 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 7:05 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:23 am and sunset at 5:00 pm CST.

Sunshine

The average sunshine in December in Roby, Missouri, is 5.2h.

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 threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

The high-temperature, in December, in Roby, is 43.5°F (6.4°C), while the low-temperature averages to 29.5°F (-1.4°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is computed to be 100.4°F (38°C).

What is the average humidity in December?

The average relative humidity in December is 76%.

How many days does it rain in December?

In Roby, during December, the rain falls for 7.5 days and regularly aggregates up to 2.01" (51mm) of precipitation.

How many days does it snow in December?

In Roby, in December, snow falls for 3.9 days, with typically accumulated 1.81" (46mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 36min of daylight.

What is the average length of the day in December?

In Roby, the average day length in December is 9h and 38min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:05 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 5:00 pm CST.

How long on average sun shines in December in Roby?

In December, the average sunshine duration in Roby is 5.2h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December in Roby?

In Roby, Missouri, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health threat from unsafe 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
Roby, MO

Average temperature in December - Roby, MO
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in December: 29.5°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 (25.2°F).

Average pressure in December
Roby, MO

Average pressure in December - Roby, 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
Roby, MO

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

The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is July (5.4mph).

Average humidity in December
Roby, MO

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

The months with the highest relative humidity are March and May (77%).
The months with the lowest relative humidity are August, September and October (73%).

Average rainfall in December
Roby, MO

Average rainfall in December - Roby, MO
  • Average rainfall in December: 2.01"

The wettest month (with the highest rainfall) is May (4.29").
The driest month (with the least rainfall) is January (1.73").

Average rainfall days in December
Roby, MO

Average rainfall days in December - Roby, MO
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is January (7 days).

Average snowfall in December
Roby, MO

Average snowfall in December - Roby, MO
  • Average snowfall in December: 1.81"

The month with the highest snowfall is February (3.43").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Roby, MO

Average snowfall days in December - Roby, MO
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is February (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Roby, 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: 5h and 1min

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 54min).

Average sunshine days in December
Roby, MO

Average sunshine days in December - Roby, MO
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is July (11.6 days).

Average UV index in December
Roby, MO

Average UV index in December - Roby, 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 and December (UV index 2).

Average cloud cover in December
Roby, MO

Average cloud cover in December - Roby, MO
  • Average cloud cover in December: 46

The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in December
Roby, MO

Average visibility in December - Roby, 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).

Roby, Missouri, USA

Weather forecast for your location

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