December weather forecast
Cairo, IL

Weather in December

December, the first month of the winter in Cairo, is still a chilly month, with an average temperature fluctuating between 33.8°F (1°C) and 45.5°F (7.5°C).

Temperature

In December, the average high-temperature decreases from a mild 55.4°F (13°C) in November to a chilly 45.5°F (7.5°C). In December, the average low-temperature is 33.8°F (1°C).

Humidity

The months with the highest humidity in Cairo, Illinois, are February, March, May and December, with an average relative humidity of 78%.

Rainfall

In Cairo, in December, it is raining for 10.5 days, with typically 2.91" (74mm) of accumulated precipitation. Throughout the year, there are 156.3 rainfall days, and 36.65" (931mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Cairo are January through April, October through December. In Cairo, during 1.5 snowfall days, 0.59" (15mm) of snow is typically accumulated. In Cairo, during the entire year, snow falls for 11.5 days and aggregates up to 4.88" (124mm) of snow.

Daylight

The month with the shortest days in Cairo, Illinois, is December, with an average of 9h and 40min of daylight.
On the first day of the month, sunrise is at 6:51 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:09 am and sunset at 4:49 pm CST.

Sunshine

In December, the average sunshine in Cairo, Illinois, is 4.9h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the most humid month in Cairo?

February, March, May and December, with an average relative humidity of 78%, are most humid months in Cairo.

What is the average humidity in December in Cairo?

The average relative humidity in December in Cairo, Illinois, is 78%.

How many days does it rain in December in Cairo?

In Cairo, Illinois, in December, it is raining for 10.5 days, with typically 2.91" (74mm) of accumulated precipitation.

How much does it snow in Cairo in December?

In Cairo, Illinois, during December, snow falls for 1.5 days and regularly aggregates up to 0.59" (15mm) of snow.

What is the month with the shortest days in Cairo?

December has the shortest days of the year in Cairo, Illinois, with an average of 9h and 40min of daylight.

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

The average day length in December is 9h and 40min.

When are sunrise and sunset in December in Cairo?

In December, on the first day of the month, sunrise is at 6:51 am and sunset at 4:40 pm. On the last day of the month, in Cairo, sunrise is at 7:09 am and sunset at 4:49 pm CST.

How many hours of sunshine does Cairo have in December?

In December, the average sunshine duration in Cairo is 4.9h.

What are the months with the lowest UV index in Cairo?

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 reading in December in Cairo?

In December, the average daily maximum UV index is 2. A UV Index value 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 sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Cairo, IL

Average temperature in December - Cairo, IL
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in December: 33.8°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

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Average pressure in December
Cairo, IL

Average pressure in December - Cairo, IL
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in December
Cairo, IL

Average wind speed in December - Cairo, IL
  • Average wind speed in December: 8.5mph

The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in December
Cairo, IL

Average humidity in December - Cairo, IL
  • Average humidity in December: 78%

The months with the highest relative humidity are February, March, May and December (78%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in December
Cairo, IL

Average rainfall in December - Cairo, IL
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is April (4.21").
The driest month (with the least rainfall) is September (1.42").

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Average rainfall days in December
Cairo, IL

Average rainfall days in December - Cairo, IL
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.8 days).

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Average snowfall in December
Cairo, IL

Average snowfall in December - Cairo, IL
  • Average snowfall in December: 0.59"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Cairo, IL

Average snowfall days in December - Cairo, IL
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in December /
Average sunshine in December
Cairo, IL

Average daylight in December / Average sunshine in December - Cairo, IL
  • Average daylight in December: 9h and 40min

The month with the longest days is June (Average daylight: 14h and 40min).
The month with the shortest days is December (Average daylight: 9h and 40min).

  • Average sunshine in December: 4h and 54min

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

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Average sunshine days in December
Cairo, IL

Average sunshine days in December - Cairo, IL
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (12.3 days).

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Average UV index in December
Cairo, IL

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

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Average cloud cover in December
Cairo, IL

Average cloud cover in December - Cairo, IL
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 26).

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Average visibility in December
Cairo, IL

Average visibility in December - Cairo, 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).

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