December weather forecast
Rosewood Heights, IL

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Weather in December

December, the first month of the winter in Rosewood Heights, is still a cold month, with an average temperature fluctuating between 29.8°F (-1.2°C) and 41.4°F (5.2°C).

Temperature

The commencement of December involves a temperature shift, with the average high-temperature dropping from a cool 52.2°F (11.2°C) in November to a wintry 41.4°F (5.2°C). During the month of December, the temperature generally drops to a low average of 29.8°F (-1.2°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In Rosewood Heights, in December, it is raining for 6.7 days, with typically 1.38" (35mm) of accumulated precipitation. In Rosewood Heights, during the entire year, the rain falls for 138 days and collects up to 23.9" (607mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In December, it is snowing for 3.8 days. Throughout December, 0.91" (23mm) of snow is accumulated. Throughout the year, there are 18.6 snowfall days, and 4.53" (115mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:18 am and sunset at 4:48 pm CST.

Sunshine

In December, the average sunshine in Rosewood Heights is 4.8h.

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 of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum UV index of 2 during December leads to these instructions:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. During bright days, sunglasses that offer UVA and UVB defense are recommended. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

Frequently asked questions

Is December cold?

During December, Rosewood Heights experiences an average high-temperature of 41.4°F (5.2°C) and a low-temperature of 29.8°F (-1.2°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, in August is computed to be 93.2°F (34°C).

What is the average humidity in December?

The average relative humidity in December is 77%.

How many days does it rain in December?

In Rosewood Heights, in December, it is raining for 6.7 days, with typically 1.38" (35mm) of accumulated precipitation.

How much does it snow in December?

In Rosewood Heights, in December, snow falls for 3.8 days, with typically accumulated 0.91" (23mm) of snow.

What is the month with the shortest days in Rosewood Heights?

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

How many hours of daylight does Rosewood Heights have in December?

In Rosewood Heights, the average day length in December is 9h and 30min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:48 pm CST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index intensity in December?

In Rosewood Heights, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk 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
Rosewood Heights, IL

Average temperature in December - Rosewood Heights, IL
  • Average high temperature in December: 41.4°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.1°F).

  • Average low temperature in December: 29.8°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

Average pressure in December
Rosewood Heights, IL

Average pressure in December - Rosewood Heights, IL
  • 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).

Average wind speed in December
Rosewood Heights, IL

Average wind speed in December - Rosewood Heights, IL
  • Average wind speed in December: 9mph

The windiest months (with the highest average wind speed) are January and February (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).

Average humidity in December
Rosewood Heights, IL

Average humidity in December - Rosewood Heights, IL
  • Average humidity in December: 77%

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Rosewood Heights, IL

Average rainfall in December - Rosewood Heights, IL
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is May (3.07").
The driest month (with the least rainfall) is February (1.14").

Average rainfall days in December
Rosewood Heights, IL

Average rainfall days in December - Rosewood Heights, IL
  • Average rainfall days in December: 6.7 days

The month with the highest number of rainy days is May (16.6 days).
The month with the least rainy days is January (5.6 days).

Average snowfall in December
Rosewood Heights, IL

Average snowfall in December - Rosewood Heights, IL
  • Average snowfall in December: 0.91"

The month with the highest snowfall is February (1.61").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Rosewood Heights, IL

Average snowfall days in December - Rosewood Heights, IL
  • Average snowfall days in December: 3.8 days

The month with the highest number of snowfall days is January (6 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
Rosewood Heights, IL

Average daylight in December / Average sunshine in December - Rosewood Heights, IL
  • 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: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).

Average sunshine days in December
Rosewood Heights, IL

Average sunshine days in December - Rosewood Heights, IL
  • Average sunshine days in December: 20.4 days

The month with the most sunshine days is December (20.4 days).
The month with the least sunshine days is July (12.3 days).

Average UV index in December
Rosewood Heights, IL

Average UV index in December - Rosewood Heights, IL
  • 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
Rosewood Heights, IL

Average cloud cover in December - Rosewood Heights, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 51).
The months with the least cloud cover are June, July and August (Cloud cover 29).

Average visibility in December
Rosewood Heights, IL

Average visibility in December - Rosewood Heights, IL
  • 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).

Rosewood Heights, Illinois, USA

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