December weather forecast
Arrowsmith, IL

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Weather in December

The first month of the winter, December, is also an icy month in Arrowsmith, Illinois, with temperature in the range of an average low of 26.6°F (-3°C) and an average high of 36.9°F (2.7°C).

Temperature

The transition into December involves a decrease in the average high-temperature, falling from a chilly 48°F (8.9°C) in November to an icy 36.9°F (2.7°C). In Arrowsmith, in December, the average low-temperature is a subzero cold 26.6°F (-3°C).

Humidity

The average relative humidity in December is 80%.

Rainfall

December is the month with the least rainfall. Rain falls for 7.5 days and accumulates 1.1" (28mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Arrowsmith, during December, snow falls for 5.9 days and regularly aggregates up to 1.42" (36mm) of snow. Throughout the year, there are 28.1 snowfall days, and 9.17" (233mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 6:59 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:38 pm CST.

Sunshine

In Arrowsmith, the average sunshine in December is 4.4h.

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 of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for average individuals.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In December, the average high-temperature and low-temperature are 36.9°F (2.7°C) and 26.6°F (-3°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, in July is estimated at 86°F (30°C).

What is the average humidity in December?

In Arrowsmith, the average relative humidity in December is 80%.

What is the driest month?

The month with the least rainfall is December, when the rain falls for 7.5 days and typically collects 1.1" (28mm) of precipitation.

How many days does it rain in December?

In Arrowsmith, in December, during 7.5 rainfall days, 1.1" (28mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Arrowsmith, in December, snow falls for 5.9 days, with typically accumulated 1.42" (36mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 20min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:59 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:38 pm CST.

How long on average sun shines in December?

In Arrowsmith, the average sunshine duration in December is 4.4h.

What are the months 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?

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 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
Arrowsmith, IL

Average temperature in December - Arrowsmith, IL
  • Average high temperature in December: 36.9°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in December: 26.6°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).

Average pressure in December
Arrowsmith, IL

Average pressure in December - Arrowsmith, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Arrowsmith, IL

Average wind speed in December - Arrowsmith, IL
  • Average wind speed in December: 10.4mph

The windiest month (with the highest average wind speed) is January (11mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in December
Arrowsmith, IL

Average humidity in December - Arrowsmith, IL
  • Average humidity in December: 80%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Arrowsmith, IL

Average rainfall in December - Arrowsmith, IL
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is May (2.87").
The driest month (with the least rainfall) is December (1.1").

Average rainfall days in December
Arrowsmith, IL

Average rainfall days in December - Arrowsmith, IL
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in December
Arrowsmith, IL

Average snowfall in December - Arrowsmith, IL
  • Average snowfall in December: 1.42"

The month with the highest snowfall is January (2.8").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Arrowsmith, IL

Average snowfall days in December - Arrowsmith, IL
  • Average snowfall days in December: 5.9 days

The month with the highest number of snowfall days is January (9.8 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
Arrowsmith, IL

Average daylight in December / Average sunshine in December - Arrowsmith, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).

Average sunshine days in December
Arrowsmith, IL

Average sunshine days in December - Arrowsmith, IL
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.3 days).

Average UV index in December
Arrowsmith, IL

Average UV index in December - Arrowsmith, IL
  • Average UV index in December: 2

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Arrowsmith, IL

Average cloud cover in December - Arrowsmith, IL
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).

Average visibility in December
Arrowsmith, IL

Average visibility in December - Arrowsmith, IL
  • Average visibility in December: 6mi

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

Arrowsmith, Illinois, USA

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